Refactor

131 files changed, 512 insertions, 917 deletions

diff --git a/src/server/api/call.ts b/src/server/api/call.ts
index b87707c348..673d449199 100644
--- a/src/server/api/call.ts
+++ b/src/server/api/call.ts
@@ -42,18 +42,12 @@ export default (endpoint: string, user: IUser, app: IApp, data: any, file?: any)
 		}
 	}
 
-	let exec = ep.exec;
-
-	if (ep.meta.requireFile && file) {
-		exec = exec.bind(null, file);
-	}
-
 	let res;
 
 	// API invoking
 	try {
 		const before = performance.now();
-		res = await exec(data, user, app);
+		res = await ep.exec(data, user, app, file);
 		const after = performance.now();
 
 		const time = after - before;
diff --git a/src/server/api/define.ts b/src/server/api/define.ts
new file mode 100644
index 0000000000..c66ade5fda
--- /dev/null
+++ b/src/server/api/define.ts
@@ -0,0 +1,51 @@
+import * as fs from 'fs';
+import { ILocalUser } from '../../models/user';
+import { IApp } from '../../models/app';
+import { IEndpointMeta } from './endpoints';
+
+type Params<T extends IEndpointMeta> = {
+	[P in keyof T['params']]: T['params'][P]['transform'] extends Function
+		? ReturnType<T['params'][P]['transform']>
+		: ReturnType<T['params'][P]['validator']['get']>[0];
+};
+
+export default function <T extends IEndpointMeta>(meta: T, cb: (params: Params<T>, user: ILocalUser, app: IApp, file?: any, cleanup?: Function) => Promise<any>): (params: any, user: ILocalUser, app: IApp, file?: any) => Promise<any> {
+	return (params: any, user: ILocalUser, app: IApp, file?: any) => {
+		function cleanup() {
+			fs.unlink(file.path, () => {});
+		}
+
+		if (meta.requireFile && file == null) return Promise.reject('file required');
+
+		const [ps, pserr] = getParams(meta, params);
+		if (pserr) {
+			if (file) cleanup();
+			return Promise.reject(pserr);
+		}
+
+		return cb(ps, user, app, file, cleanup);
+	};
+}
+
+function getParams<T extends IEndpointMeta>(defs: T, params: any): [Params<T>, Error] {
+	const x: any = {};
+	let err: Error = null;
+	Object.entries(defs.params).some(([k, def]) => {
+		const [v, e] = def.validator.get(params[k]);
+		if (e) {
+			err = new Error(e.message);
+			err.name = 'INVALID_PARAM';
+			(err as any).param = k;
+			return true;
+		} else {
+			if (v === undefined && def.default) {
+				x[k] = def.default;
+			} else {
+				x[k] = v;
+			}
+			if (def.transform) x[k] = def.transform(x[k]);
+			return false;
+		}
+	});
+	return [x, err];
+}
diff --git a/src/server/api/endpoints/admin/invite.ts b/src/server/api/endpoints/admin/invite.ts
index 892b2579f2..056cb8aa75 100644
--- a/src/server/api/endpoints/admin/invite.ts
+++ b/src/server/api/endpoints/admin/invite.ts
@@ -1,5 +1,6 @@
 import rndstr from 'rndstr';
 import RegistrationTicket from '../../../../models/registration-tickets';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -12,7 +13,7 @@ export const meta = {
 	params: {}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const code = rndstr({ length: 5, chars: '0-9' });
 
 	await RegistrationTicket.insert({
@@ -23,4 +24,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 	res({
 		code: code
 	});
-});
+}));
diff --git a/src/server/api/endpoints/admin/suspend-user.ts b/src/server/api/endpoints/admin/suspend-user.ts
index 6d8b28932f..0ad0aab74c 100644
--- a/src/server/api/endpoints/admin/suspend-user.ts
+++ b/src/server/api/endpoints/admin/suspend-user.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import ID, { transform } from '../../../../misc/cafy-id';
-import getParams from '../../get-params';
+import define from '../../define';
 import User from '../../../../models/user';
 
 export const meta = {
@@ -24,10 +24,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const user = await User.findOne({
 		_id: ps.userId
 	});
@@ -49,4 +46,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 		});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/admin/unsuspend-user.ts b/src/server/api/endpoints/admin/unsuspend-user.ts
index 5c736122bb..7c5eedee46 100644
--- a/src/server/api/endpoints/admin/unsuspend-user.ts
+++ b/src/server/api/endpoints/admin/unsuspend-user.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import ID, { transform } from '../../../../misc/cafy-id';
-import getParams from '../../get-params';
+import define from '../../define';
 import User from '../../../../models/user';
 
 export const meta = {
@@ -24,10 +24,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const user = await User.findOne({
 		_id: ps.userId
 	});
@@ -45,4 +42,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 		});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/admin/unverify-user.ts b/src/server/api/endpoints/admin/unverify-user.ts
index fc55bd7476..d749e002e3 100644
--- a/src/server/api/endpoints/admin/unverify-user.ts
+++ b/src/server/api/endpoints/admin/unverify-user.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import ID, { transform } from '../../../../misc/cafy-id';
-import getParams from '../../get-params';
+import define from '../../define';
 import User from '../../../../models/user';
 
 export const meta = {
@@ -24,10 +24,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const user = await User.findOne({
 		_id: ps.userId
 	});
@@ -45,4 +42,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 		});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/admin/update-meta.ts b/src/server/api/endpoints/admin/update-meta.ts
index aed53e12ce..c2bb107f87 100644
--- a/src/server/api/endpoints/admin/update-meta.ts
+++ b/src/server/api/endpoints/admin/update-meta.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import Meta from '../../../../models/meta';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -55,10 +55,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const set = {} as any;
 
 	if (ps.broadcasts) {
@@ -90,4 +87,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 	}, { upsert: true });
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/admin/verify-user.ts b/src/server/api/endpoints/admin/verify-user.ts
index b8c0bbaa8d..09efc2e803 100644
--- a/src/server/api/endpoints/admin/verify-user.ts
+++ b/src/server/api/endpoints/admin/verify-user.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import ID, { transform } from '../../../../misc/cafy-id';
-import getParams from '../../get-params';
+import define from '../../define';
 import User from '../../../../models/user';
 
 export const meta = {
@@ -24,10 +24,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const user = await User.findOne({
 		_id: ps.userId
 	});
@@ -45,4 +42,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 		});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/ap/show.ts b/src/server/api/endpoints/ap/show.ts
index c5286583d0..778d1e5099 100644
--- a/src/server/api/endpoints/ap/show.ts
+++ b/src/server/api/endpoints/ap/show.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import config from '../../../../config';
 import * as mongo from 'mongodb';
 import User, { pack as packUser, IUser } from '../../../../models/user';
@@ -25,15 +25,12 @@ export const meta = {
 	},
 };
 
-export default async (params: any) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const object = await fetchAny(ps.uri);
-	if (object !== null) return object;
+	if (object == null) return rej('object not found');
 
-	throw new Error('object not found');
-};
+	res(object);
+}));
 
 /***
  * URIからUserかNoteを解決する
diff --git a/src/server/api/endpoints/app/create.ts b/src/server/api/endpoints/app/create.ts
index 40da5144f6..af66bb9d5a 100644
--- a/src/server/api/endpoints/app/create.ts
+++ b/src/server/api/endpoints/app/create.ts
@@ -1,8 +1,7 @@
 import rndstr from 'rndstr';
 import $ from 'cafy';
 import App, { pack } from '../../../../models/app';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: false,
@@ -28,10 +27,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Generate secret
 	const secret = rndstr('a-zA-Z0-9', 32);
 
@@ -51,4 +47,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 		detail: true,
 		includeSecret: true
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/app/show.ts b/src/server/api/endpoints/app/show.ts
index 0d73985b48..21e6350113 100644
--- a/src/server/api/endpoints/app/show.ts
+++ b/src/server/api/endpoints/app/show.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import App, { pack, IApp } from '../../../../models/app';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import App, { pack } from '../../../../models/app';
+import define from '../../define';
 
 export const meta = {
 	params: {
@@ -12,10 +11,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser, app: IApp) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user, app) => new Promise(async (res, rej) => {
 	const isSecure = user != null && app == null;
 
 	// Lookup app
@@ -30,4 +26,4 @@ export default (params: any, user: ILocalUser, app: IApp) => new Promise(async (
 		detail: true,
 		includeSecret: isSecure && ap.userId.equals(user._id)
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/auth/accept.ts b/src/server/api/endpoints/auth/accept.ts
index ed1c2fa390..b7e11bd463 100644
--- a/src/server/api/endpoints/auth/accept.ts
+++ b/src/server/api/endpoints/auth/accept.ts
@@ -4,8 +4,7 @@ import $ from 'cafy';
 import App from '../../../../models/app';
 import AuthSess from '../../../../models/auth-session';
 import AccessToken from '../../../../models/access-token';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -19,10 +18,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch token
 	const session = await AuthSess
 		.findOne({ token: ps.token });
@@ -70,4 +66,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Response
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/auth/session/generate.ts b/src/server/api/endpoints/auth/session/generate.ts
index 79eb34d96a..5ef3404b73 100644
--- a/src/server/api/endpoints/auth/session/generate.ts
+++ b/src/server/api/endpoints/auth/session/generate.ts
@@ -3,7 +3,7 @@ import $ from 'cafy';
 import App from '../../../../../models/app';
 import AuthSess from '../../../../../models/auth-session';
 import config from '../../../../../config';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: false,
@@ -15,10 +15,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	// Lookup app
 	const app = await App.findOne({
 		secret: ps.appSecret
@@ -43,4 +40,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 		token: doc.token,
 		url: `${config.auth_url}/${doc.token}`
 	});
-});
+}));
diff --git a/src/server/api/endpoints/auth/session/show.ts b/src/server/api/endpoints/auth/session/show.ts
index 9e7f4f52d4..cc63c43ad3 100644
--- a/src/server/api/endpoints/auth/session/show.ts
+++ b/src/server/api/endpoints/auth/session/show.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy';
 import AuthSess, { pack } from '../../../../../models/auth-session';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: false,
@@ -13,10 +12,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Lookup session
 	const session = await AuthSess.findOne({
 		token: ps.token
@@ -28,4 +24,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Response
 	res(await pack(session, user));
-});
+}));
diff --git a/src/server/api/endpoints/auth/session/userkey.ts b/src/server/api/endpoints/auth/session/userkey.ts
index 50edf12abc..9f924d27a0 100644
--- a/src/server/api/endpoints/auth/session/userkey.ts
+++ b/src/server/api/endpoints/auth/session/userkey.ts
@@ -3,7 +3,7 @@ import App from '../../../../../models/app';
 import AuthSess from '../../../../../models/auth-session';
 import AccessToken from '../../../../../models/access-token';
 import { pack } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: false,
@@ -19,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	// Lookup app
 	const app = await App.findOne({
 		secret: ps.appSecret
@@ -71,4 +68,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 			detail: true
 		})
 	});
-});
+}));
diff --git a/src/server/api/endpoints/blocking/create.ts b/src/server/api/endpoints/blocking/create.ts
index 7ec01b4237..7166505309 100644
--- a/src/server/api/endpoints/blocking/create.ts
+++ b/src/server/api/endpoints/blocking/create.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 const ms = require('ms');
-import User, { pack, ILocalUser } from '../../../../models/user';
+import User, { pack } from '../../../../models/user';
 import Blocking from '../../../../models/blocking';
 import create from '../../../../services/blocking/create';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -34,10 +34,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const blocker = user;
 
 	// 自分自身
@@ -76,4 +73,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await pack(blockee._id, user, {
 		detail: true
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/blocking/delete.ts b/src/server/api/endpoints/blocking/delete.ts
index adf8d8c500..667255a66b 100644
--- a/src/server/api/endpoints/blocking/delete.ts
+++ b/src/server/api/endpoints/blocking/delete.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 const ms = require('ms');
-import User, { pack, ILocalUser } from '../../../../models/user';
+import User, { pack } from '../../../../models/user';
 import Blocking from '../../../../models/blocking';
 import deleteBlocking from '../../../../services/blocking/delete';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -34,10 +34,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const blocker = user;
 
 	// Check if the blockee is yourself
@@ -76,4 +73,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await pack(blockee._id, user, {
 		detail: true
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/blocking/list.ts b/src/server/api/endpoints/blocking/list.ts
index 52f55805d0..e2649573d5 100644
--- a/src/server/api/endpoints/blocking/list.ts
+++ b/src/server/api/endpoints/blocking/list.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Blocking, { packMany } from '../../../../models/blocking';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -31,10 +30,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -66,4 +62,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 		});
 
 	res(await packMany(blockings, me));
-});
+}));
diff --git a/src/server/api/endpoints/charts/drive.ts b/src/server/api/endpoints/charts/drive.ts
index 2200081330..ca0b6c53d2 100644
--- a/src/server/api/endpoints/charts/drive.ts
+++ b/src/server/api/endpoints/charts/drive.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import driveChart from '../../../../chart/drive';
 
 export const meta = {
@@ -25,11 +25,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await driveChart.getChart(ps.span as any, ps.limit);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/federation.ts b/src/server/api/endpoints/charts/federation.ts
index ba19aae04c..c774f0b891 100644
--- a/src/server/api/endpoints/charts/federation.ts
+++ b/src/server/api/endpoints/charts/federation.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import federationChart from '../../../../chart/federation';
 
 export const meta = {
@@ -25,11 +25,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await federationChart.getChart(ps.span as any, ps.limit);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/hashtag.ts b/src/server/api/endpoints/charts/hashtag.ts
index 2ef6a06062..322708ed74 100644
--- a/src/server/api/endpoints/charts/hashtag.ts
+++ b/src/server/api/endpoints/charts/hashtag.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import hashtagChart from '../../../../chart/hashtag';
 
 export const meta = {
@@ -32,11 +32,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await hashtagChart.getChart(ps.span as any, ps.limit, ps.tag);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/network.ts b/src/server/api/endpoints/charts/network.ts
index 249504f2e1..a34eab845c 100644
--- a/src/server/api/endpoints/charts/network.ts
+++ b/src/server/api/endpoints/charts/network.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import networkChart from '../../../../chart/network';
 
 export const meta = {
@@ -25,11 +25,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await networkChart.getChart(ps.span as any, ps.limit);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/notes.ts b/src/server/api/endpoints/charts/notes.ts
index 0f04a4bd90..1795c85c8b 100644
--- a/src/server/api/endpoints/charts/notes.ts
+++ b/src/server/api/endpoints/charts/notes.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import notesChart from '../../../../chart/notes';
 
 export const meta = {
@@ -25,11 +25,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await notesChart.getChart(ps.span as any, ps.limit);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/user/drive.ts b/src/server/api/endpoints/charts/user/drive.ts
index beb6b5bea3..934d38c44d 100644
--- a/src/server/api/endpoints/charts/user/drive.ts
+++ b/src/server/api/endpoints/charts/user/drive.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import perUserDriveChart from '../../../../../chart/per-user-drive';
 import ID, { transform } from '../../../../../misc/cafy-id';
 
@@ -35,11 +35,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await perUserDriveChart.getChart(ps.span as any, ps.limit, ps.userId);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/user/following.ts b/src/server/api/endpoints/charts/user/following.ts
index e0aebf4255..9eba6d2467 100644
--- a/src/server/api/endpoints/charts/user/following.ts
+++ b/src/server/api/endpoints/charts/user/following.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import perUserFollowingChart from '../../../../../chart/per-user-following';
 import ID, { transform } from '../../../../../misc/cafy-id';
 
@@ -35,11 +35,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await perUserFollowingChart.getChart(ps.span as any, ps.limit, ps.userId);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/user/notes.ts b/src/server/api/endpoints/charts/user/notes.ts
index 251de4d399..20fc49cde7 100644
--- a/src/server/api/endpoints/charts/user/notes.ts
+++ b/src/server/api/endpoints/charts/user/notes.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import perUserNotesChart from '../../../../../chart/per-user-notes';
 import ID, { transform } from '../../../../../misc/cafy-id';
 
@@ -35,11 +35,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await perUserNotesChart.getChart(ps.span as any, ps.limit, ps.userId);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/user/reactions.ts b/src/server/api/endpoints/charts/user/reactions.ts
index f812400709..bf2204a4e4 100644
--- a/src/server/api/endpoints/charts/user/reactions.ts
+++ b/src/server/api/endpoints/charts/user/reactions.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import perUserReactionsChart from '../../../../../chart/per-user-reactions';
 import ID, { transform } from '../../../../../misc/cafy-id';
 
@@ -35,11 +35,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await perUserReactionsChart.getChart(ps.span as any, ps.limit, ps.userId);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/charts/users.ts b/src/server/api/endpoints/charts/users.ts
index 9c23235b23..a4a3f2f4b9 100644
--- a/src/server/api/endpoints/charts/users.ts
+++ b/src/server/api/endpoints/charts/users.ts
@@ -1,5 +1,5 @@
 import $ from 'cafy';
-import getParams from '../../get-params';
+import define from '../../define';
 import usersChart from '../../../../chart/users';
 
 export const meta = {
@@ -25,11 +25,8 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const stats = await usersChart.getChart(ps.span as any, ps.limit);
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/drive.ts b/src/server/api/endpoints/drive.ts
index 063cd475d4..43fe771385 100644
--- a/src/server/api/endpoints/drive.ts
+++ b/src/server/api/endpoints/drive.ts
@@ -1,6 +1,6 @@
 import DriveFile from '../../../models/drive-file';
-import { ILocalUser } from '../../../models/user';
 import config from '../../../config';
+import define from '../define';
 
 export const meta = {
 	desc: {
@@ -13,7 +13,7 @@ export const meta = {
 	kind: 'drive-read'
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Calculate drive usage
 	const usage = await DriveFile
 		.aggregate([{
@@ -42,4 +42,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		capacity: 1024 * 1024 * config.localDriveCapacityMb,
 		usage: usage
 	});
-});
+}));
diff --git a/src/server/api/endpoints/drive/files.ts b/src/server/api/endpoints/drive/files.ts
index ae4e2249ff..27f101562d 100644
--- a/src/server/api/endpoints/drive/files.ts
+++ b/src/server/api/endpoints/drive/files.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import DriveFile, { packMany } from '../../../../models/drive-file';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -41,13 +40,10 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
-		throw 'cannot set sinceId and untilId';
+		return rej('cannot set sinceId and untilId');
 	}
 
 	const sort = {
@@ -81,5 +77,5 @@ export default async (params: any, user: ILocalUser) => {
 			sort: sort
 		});
 
-	return await packMany(files);
-};
+	res(await packMany(files));
+}));
diff --git a/src/server/api/endpoints/drive/files/attached_notes.ts b/src/server/api/endpoints/drive/files/attached_notes.ts
index ad9a2370b1..ec5acbd751 100644
--- a/src/server/api/endpoints/drive/files/attached_notes.ts
+++ b/src/server/api/endpoints/drive/files/attached_notes.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFile from '../../../../../models/drive-file';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import { packMany } from '../../../../../models/note';
 
 export const meta = {
@@ -28,10 +27,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch file
 	const file = await DriveFile
 		.findOne({
@@ -47,4 +43,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await packMany(file.metadata.attachedNoteIds || [], user, {
 		detail: true
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/drive/files/check_existence.ts b/src/server/api/endpoints/drive/files/check_existence.ts
index a5bdad5fb9..d3ba4b386d 100644
--- a/src/server/api/endpoints/drive/files/check_existence.ts
+++ b/src/server/api/endpoints/drive/files/check_existence.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy';
 import DriveFile, { pack } from '../../../../../models/drive-file';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -23,10 +22,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const file = await DriveFile.findOne({
 		md5: ps.md5,
 		'metadata.userId': user._id,
@@ -38,4 +34,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	} else {
 		res({ file: await pack(file) });
 	}
-});
+}));
diff --git a/src/server/api/endpoints/drive/files/create.ts b/src/server/api/endpoints/drive/files/create.ts
index 2653eba655..3c334a7c1f 100644
--- a/src/server/api/endpoints/drive/files/create.ts
+++ b/src/server/api/endpoints/drive/files/create.ts
@@ -1,10 +1,8 @@
-import * as fs from 'fs';
 const ms = require('ms');
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import { validateFileName, pack } from '../../../../../models/drive-file';
 import create from '../../../../../services/drive/add-file';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -52,11 +50,7 @@ export const meta = {
 	}
 };
 
-export default async (file: any, params: any, user: ILocalUser): Promise<any> => {
-	if (file == null) {
-		throw 'file is required';
-	}
-
+export default define(meta, (ps, user, app, file, cleanup) => new Promise(async (res, rej) => {
 	// Get 'name' parameter
 	let name = file.originalname;
 	if (name !== undefined && name !== null) {
@@ -66,35 +60,24 @@ export default async (file: any, params: any, user: ILocalUser): Promise<any> =>
 		} else if (name === 'blob') {
 			name = null;
 		} else if (!validateFileName(name)) {
-			throw 'invalid name';
+			return rej('invalid name');
 		}
 	} else {
 		name = null;
 	}
 
-	function cleanup() {
-		fs.unlink(file.path, () => {});
-	}
-
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) {
-		cleanup();
-		throw psErr;
-	}
-
 	try {
 		// Create file
 		const driveFile = await create(user, file.path, name, null, ps.folderId, ps.force, false, null, null, ps.isSensitive);
 
 		cleanup();
 
-		// Serialize
-		return pack(driveFile);
+		res(pack(driveFile));
 	} catch (e) {
 		console.error(e);
 
 		cleanup();
 
-		throw e;
+		rej(e);
 	}
-};
+}));
diff --git a/src/server/api/endpoints/drive/files/delete.ts b/src/server/api/endpoints/drive/files/delete.ts
index af7e192655..7367c8fbb6 100644
--- a/src/server/api/endpoints/drive/files/delete.ts
+++ b/src/server/api/endpoints/drive/files/delete.ts
@@ -2,8 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id
 import DriveFile from '../../../../../models/drive-file';
 import del from '../../../../../services/drive/delete-file';
 import { publishDriveStream } from '../../../../../stream';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -29,10 +28,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch file
 	const file = await DriveFile
 		.findOne({
@@ -51,4 +47,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	publishDriveStream(user._id, 'fileDeleted', file._id);
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/drive/files/find.ts b/src/server/api/endpoints/drive/files/find.ts
index 0ac110c110..1f9c3de1cf 100644
--- a/src/server/api/endpoints/drive/files/find.ts
+++ b/src/server/api/endpoints/drive/files/find.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFile, { pack } from '../../../../../models/drive-file';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -24,10 +23,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const files = await DriveFile
 		.find({
 			filename: name,
@@ -36,4 +32,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await Promise.all(files.map(file => pack(file))));
-});
+}));
diff --git a/src/server/api/endpoints/drive/files/show.ts b/src/server/api/endpoints/drive/files/show.ts
index ce0812c508..450a97065b 100644
--- a/src/server/api/endpoints/drive/files/show.ts
+++ b/src/server/api/endpoints/drive/files/show.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFile, { pack } from '../../../../../models/drive-file';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -27,10 +26,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch file
 	const file = await DriveFile
 		.findOne({
@@ -49,4 +45,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	});
 
 	res(_file);
-});
+}));
diff --git a/src/server/api/endpoints/drive/files/update.ts b/src/server/api/endpoints/drive/files/update.ts
index 7c335e5bc6..4efec3dc2a 100644
--- a/src/server/api/endpoints/drive/files/update.ts
+++ b/src/server/api/endpoints/drive/files/update.ts
@@ -2,8 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id
 import DriveFolder from '../../../../../models/drive-folder';
 import DriveFile, { validateFileName, pack } from '../../../../../models/drive-file';
 import { publishDriveStream } from '../../../../../stream';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import Note from '../../../../../models/note';
 
 export const meta = {
@@ -54,10 +53,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch file
 	const file = await DriveFile
 		.findOne({
@@ -122,4 +118,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Publish fileUpdated event
 	publishDriveStream(user._id, 'fileUpdated', fileObj);
-});
+}));
diff --git a/src/server/api/endpoints/drive/files/upload_from_url.ts b/src/server/api/endpoints/drive/files/upload_from_url.ts
index 3d19725275..35309d623e 100644
--- a/src/server/api/endpoints/drive/files/upload_from_url.ts
+++ b/src/server/api/endpoints/drive/files/upload_from_url.ts
@@ -3,7 +3,7 @@ const ms = require('ms');
 import { pack } from '../../../../../models/drive-file';
 import uploadFromUrl from '../../../../../services/drive/upload-from-url';
 import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -33,9 +33,6 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser): Promise<any> => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
-	return pack(await uploadFromUrl(ps.url, user, ps.folderId));
-};
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
+	res(pack(await uploadFromUrl(ps.url, user, ps.folderId)));
+}));
diff --git a/src/server/api/endpoints/drive/folders.ts b/src/server/api/endpoints/drive/folders.ts
index 95700ee26c..3a76ecd27d 100644
--- a/src/server/api/endpoints/drive/folders.ts
+++ b/src/server/api/endpoints/drive/folders.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import DriveFolder, { pack } from '../../../../models/drive-folder';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -37,10 +36,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -71,4 +67,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await Promise.all(folders.map(folder => pack(folder))));
-});
+}));
diff --git a/src/server/api/endpoints/drive/folders/create.ts b/src/server/api/endpoints/drive/folders/create.ts
index b51fb0264e..63c6a436d4 100644
--- a/src/server/api/endpoints/drive/folders/create.ts
+++ b/src/server/api/endpoints/drive/folders/create.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFolder, { isValidFolderName, pack } from '../../../../../models/drive-folder';
 import { publishDriveStream } from '../../../../../stream';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -37,10 +36,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// If the parent folder is specified
 	let parent = null;
 	if (ps.parentId) {
@@ -72,4 +68,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Publish folderCreated event
 	publishDriveStream(user._id, 'folderCreated', folderObj);
-});
+}));
diff --git a/src/server/api/endpoints/drive/folders/delete.ts b/src/server/api/endpoints/drive/folders/delete.ts
index 304666bdc9..019c5eb00b 100644
--- a/src/server/api/endpoints/drive/folders/delete.ts
+++ b/src/server/api/endpoints/drive/folders/delete.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFolder from '../../../../../models/drive-folder';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 import { publishDriveStream } from '../../../../../stream';
 import DriveFile from '../../../../../models/drive-file';
 
@@ -29,10 +28,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get folder
 	const folder = await DriveFolder
 		.findOne({
@@ -59,4 +55,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	publishDriveStream(user._id, 'folderDeleted', folder._id);
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/drive/folders/find.ts b/src/server/api/endpoints/drive/folders/find.ts
index 3d24d18685..a8ce012f10 100644
--- a/src/server/api/endpoints/drive/folders/find.ts
+++ b/src/server/api/endpoints/drive/folders/find.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFolder, { pack } from '../../../../../models/drive-folder';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -24,10 +23,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const folders = await DriveFolder
 		.find({
 			name: name,
@@ -36,4 +32,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await Promise.all(folders.map(folder => pack(folder))));
-});
+}));
diff --git a/src/server/api/endpoints/drive/folders/show.ts b/src/server/api/endpoints/drive/folders/show.ts
index b7d8f0a29b..49e51544b6 100644
--- a/src/server/api/endpoints/drive/folders/show.ts
+++ b/src/server/api/endpoints/drive/folders/show.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFolder, { pack } from '../../../../../models/drive-folder';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -27,10 +26,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get folder
 	const folder = await DriveFolder
 		.findOne({
@@ -46,4 +42,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await pack(folder, {
 		detail: true
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/drive/folders/update.ts b/src/server/api/endpoints/drive/folders/update.ts
index 53bb14bfe7..f10f9c820d 100644
--- a/src/server/api/endpoints/drive/folders/update.ts
+++ b/src/server/api/endpoints/drive/folders/update.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import DriveFolder, { isValidFolderName, pack } from '../../../../../models/drive-folder';
 import { publishDriveStream } from '../../../../../stream';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -45,10 +44,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch folder
 	const folder = await DriveFolder
 		.findOne({
@@ -122,4 +118,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Publish folderUpdated event
 	publishDriveStream(user._id, 'folderUpdated', folderObj);
-});
+}));
diff --git a/src/server/api/endpoints/drive/stream.ts b/src/server/api/endpoints/drive/stream.ts
index ecf405fe64..804ecf50d9 100644
--- a/src/server/api/endpoints/drive/stream.ts
+++ b/src/server/api/endpoints/drive/stream.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import DriveFile, { packMany } from '../../../../models/drive-file';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -30,10 +29,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -70,4 +66,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await packMany(files));
-});
+}));
diff --git a/src/server/api/endpoints/following/create.ts b/src/server/api/endpoints/following/create.ts
index 7795bbcc61..f826776892 100644
--- a/src/server/api/endpoints/following/create.ts
+++ b/src/server/api/endpoints/following/create.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 const ms = require('ms');
-import User, { pack, ILocalUser } from '../../../../models/user';
+import User, { pack } from '../../../../models/user';
 import Following from '../../../../models/following';
 import create from '../../../../services/following/create';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -34,10 +34,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const follower = user;
 
 	// 自分自身
@@ -78,4 +75,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Send response
 	res(await pack(followee._id, user));
-});
+}));
diff --git a/src/server/api/endpoints/following/delete.ts b/src/server/api/endpoints/following/delete.ts
index ae0edd34ee..92a50ce722 100644
--- a/src/server/api/endpoints/following/delete.ts
+++ b/src/server/api/endpoints/following/delete.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 const ms = require('ms');
-import User, { pack, ILocalUser } from '../../../../models/user';
+import User, { pack } from '../../../../models/user';
 import Following from '../../../../models/following';
 import deleteFollowing from '../../../../services/following/delete';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -34,10 +34,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const follower = user;
 
 	// Check if the followee is yourself
@@ -74,4 +71,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Send response
 	res(await pack(followee._id, user));
-});
+}));
diff --git a/src/server/api/endpoints/following/requests/accept.ts b/src/server/api/endpoints/following/requests/accept.ts
index 1172f463d6..36c3694eed 100644
--- a/src/server/api/endpoints/following/requests/accept.ts
+++ b/src/server/api/endpoints/following/requests/accept.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import acceptFollowRequest from '../../../../../services/following/requests/accept';
-import User, { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import User from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch follower
 	const follower = await User.findOne({
 		_id: ps.userId
@@ -37,4 +34,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	await acceptFollowRequest(user, follower);
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/following/requests/cancel.ts b/src/server/api/endpoints/following/requests/cancel.ts
index 77bfcfe15e..bfb7d0713c 100644
--- a/src/server/api/endpoints/following/requests/cancel.ts
+++ b/src/server/api/endpoints/following/requests/cancel.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import cancelFollowRequest from '../../../../../services/following/requests/cancel';
-import User, { pack, ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import User, { pack } from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch followee
 	const followee = await User.findOne({
 		_id: ps.userId
@@ -41,4 +38,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	}
 
 	res(await pack(followee._id, user));
-});
+}));
diff --git a/src/server/api/endpoints/following/requests/list.ts b/src/server/api/endpoints/following/requests/list.ts
index 6d42d06db2..c561ea066c 100644
--- a/src/server/api/endpoints/following/requests/list.ts
+++ b/src/server/api/endpoints/following/requests/list.ts
@@ -1,6 +1,6 @@
 //import $ from 'cafy'; import ID, { transform } from '../../../../../cafy-id';
 import FollowRequest, { pack } from '../../../../../models/follow-request';
-import { ILocalUser } from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -13,11 +13,11 @@ export const meta = {
 	kind: 'following-read'
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const reqs = await FollowRequest.find({
 		followeeId: user._id
 	});
 
 	// Send response
 	res(await Promise.all(reqs.map(req => pack(req))));
-});
+}));
diff --git a/src/server/api/endpoints/following/requests/reject.ts b/src/server/api/endpoints/following/requests/reject.ts
index 45ebb7807b..bd0b3bba22 100644
--- a/src/server/api/endpoints/following/requests/reject.ts
+++ b/src/server/api/endpoints/following/requests/reject.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import rejectFollowRequest from '../../../../../services/following/requests/reject';
-import User, { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import User from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch follower
 	const follower = await User.findOne({
 		_id: ps.userId
@@ -37,4 +34,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	await rejectFollowRequest(user, follower);
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/following/stalk.ts b/src/server/api/endpoints/following/stalk.ts
index 434bc52b59..1fef9a429a 100644
--- a/src/server/api/endpoints/following/stalk.ts
+++ b/src/server/api/endpoints/following/stalk.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Following from '../../../../models/following';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +20,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const follower = user;
 
 	// Fetch following
@@ -47,4 +43,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res();
 
 	// TODO: イベント
-});
+}));
diff --git a/src/server/api/endpoints/following/unstalk.ts b/src/server/api/endpoints/following/unstalk.ts
index 00e91357ec..66e99bed58 100644
--- a/src/server/api/endpoints/following/unstalk.ts
+++ b/src/server/api/endpoints/following/unstalk.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Following from '../../../../models/following';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +20,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const follower = user;
 
 	// Fetch following
@@ -47,4 +43,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res();
 
 	// TODO: イベント
-});
+}));
diff --git a/src/server/api/endpoints/games/reversi/games.ts b/src/server/api/endpoints/games/reversi/games.ts
index 9c7a7c4d74..2bebe36ef8 100644
--- a/src/server/api/endpoints/games/reversi/games.ts
+++ b/src/server/api/endpoints/games/reversi/games.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import ReversiGame, { pack } from '../../../../../models/games/reversi/game';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	params: {
@@ -27,10 +26,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -72,4 +68,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(Promise.all(games.map(async (g) => await pack(g, user, {
 		detail: false
 	}))));
-});
+}));
diff --git a/src/server/api/endpoints/games/reversi/games/show.ts b/src/server/api/endpoints/games/reversi/games/show.ts
index a2c84ae82d..c747202354 100644
--- a/src/server/api/endpoints/games/reversi/games/show.ts
+++ b/src/server/api/endpoints/games/reversi/games/show.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../../misc/cafy-id';
 import ReversiGame, { pack } from '../../../../../../models/games/reversi/game';
 import Reversi from '../../../../../../games/reversi/core';
-import { ILocalUser } from '../../../../../../models/user';
-import getParams from '../../../../get-params';
+import define from '../../../../define';
 
 export const meta = {
 	params: {
@@ -13,10 +12,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const game = await ReversiGame.findOne({ _id: ps.gameId });
 
 	if (game == null) {
@@ -39,4 +35,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		board: o.board,
 		turn: o.turn
 	}, packed));
-});
+}));
diff --git a/src/server/api/endpoints/games/reversi/games/surrender.ts b/src/server/api/endpoints/games/reversi/games/surrender.ts
index 2860c154fe..aab88da664 100644
--- a/src/server/api/endpoints/games/reversi/games/surrender.ts
+++ b/src/server/api/endpoints/games/reversi/games/surrender.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../../misc/cafy-id';
 import ReversiGame, { pack } from '../../../../../../models/games/reversi/game';
-import { ILocalUser } from '../../../../../../models/user';
-import getParams from '../../../../get-params';
 import { publishReversiGameStream } from '../../../../../../stream';
+import define from '../../../../define';
 
 export const meta = {
 	desc: {
@@ -22,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const game = await ReversiGame.findOne({ _id: ps.gameId });
 
 	if (game == null) {
@@ -58,4 +54,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/games/reversi/invitations.ts b/src/server/api/endpoints/games/reversi/invitations.ts
index 3962282759..d808ff2e78 100644
--- a/src/server/api/endpoints/games/reversi/invitations.ts
+++ b/src/server/api/endpoints/games/reversi/invitations.ts
@@ -1,11 +1,11 @@
 import Matching, { pack as packMatching } from '../../../../../models/games/reversi/matching';
-import { ILocalUser } from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Find session
 	const invitations = await Matching.find({
 		childId: user._id
@@ -17,4 +17,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Reponse
 	res(Promise.all(invitations.map(async (i) => await packMatching(i, user))));
-});
+}));
diff --git a/src/server/api/endpoints/games/reversi/match.ts b/src/server/api/endpoints/games/reversi/match.ts
index f43650aeeb..e0f9c20cbb 100644
--- a/src/server/api/endpoints/games/reversi/match.ts
+++ b/src/server/api/endpoints/games/reversi/match.ts
@@ -1,10 +1,10 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import Matching, { pack as packMatching } from '../../../../../models/games/reversi/matching';
 import ReversiGame, { pack as packGame } from '../../../../../models/games/reversi/game';
-import User, { ILocalUser } from '../../../../../models/user';
+import User from '../../../../../models/user';
 import { publishMainStream, publishReversiStream } from '../../../../../stream';
 import { eighteight } from '../../../../../games/reversi/maps';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -17,10 +17,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Myself
 	if (ps.userId.equals(user._id)) {
 		return rej('invalid userId param');
@@ -103,4 +100,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 		publishMainStream(child._id, 'reversiInvited', packed);
 	}
-});
+}));
diff --git a/src/server/api/endpoints/games/reversi/match/cancel.ts b/src/server/api/endpoints/games/reversi/match/cancel.ts
index d5c186409c..ac51e416ed 100644
--- a/src/server/api/endpoints/games/reversi/match/cancel.ts
+++ b/src/server/api/endpoints/games/reversi/match/cancel.ts
@@ -1,14 +1,14 @@
 import Matching from '../../../../../../models/games/reversi/matching';
-import { ILocalUser } from '../../../../../../models/user';
+import define from '../../../../define';
 
 export const meta = {
 	requireCredential: true
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	await Matching.remove({
 		parentId: user._id
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/hashtags/search.ts b/src/server/api/endpoints/hashtags/search.ts
index 35ae2a83b3..4d753808d4 100644
--- a/src/server/api/endpoints/hashtags/search.ts
+++ b/src/server/api/endpoints/hashtags/search.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import Hashtag from '../../../../models/hashtag';
-import getParams from '../../get-params';
+import define from '../../define';
 const escapeRegexp = require('escape-regexp');
 
 export const meta = {
@@ -36,10 +36,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	const hashtags = await Hashtag
 		.find({
 			tag: new RegExp('^' + escapeRegexp(ps.query.toLowerCase()))
@@ -52,4 +49,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 		});
 
 	res(hashtags.map(tag => tag.tag));
-});
+}));
diff --git a/src/server/api/endpoints/hashtags/trend.ts b/src/server/api/endpoints/hashtags/trend.ts
index 0ec6a4ffec..02d398a683 100644
--- a/src/server/api/endpoints/hashtags/trend.ts
+++ b/src/server/api/endpoints/hashtags/trend.ts
@@ -1,6 +1,7 @@
 import Note from '../../../../models/note';
 import { erase } from '../../../../prelude/array';
 import Meta from '../../../../models/meta';
+import define from '../../define';
 
 /*
 トレンドに載るためには「『直近a分間のユニーク投稿数が今からa分前～今からb分前の間のユニーク投稿数のn倍以上』のハッシュタグの上位5位以内に入る」ことが必要
@@ -14,10 +15,11 @@ const requiredUsers = 3; // 最低何人がそのタグを投稿している必�
 
 const max = 5;
 
-/**
- * Get trends of hashtags
- */
-export default () => new Promise(async (res, rej) => {
+export const meta = {
+	requireCredential: false,
+};
+
+export default define(meta, () => new Promise(async (res, rej) => {
 	const meta = await Meta.findOne({});
 	const hidedTags = meta ? (meta.hidedTags || []).map(t => t.toLowerCase()) : [];
 
@@ -143,4 +145,4 @@ export default () => new Promise(async (res, rej) => {
 	}));
 
 	res(stats);
-});
+}));
diff --git a/src/server/api/endpoints/i.ts b/src/server/api/endpoints/i.ts
index 1c488d94c6..aea47ad795 100644
--- a/src/server/api/endpoints/i.ts
+++ b/src/server/api/endpoints/i.ts
@@ -1,5 +1,5 @@
-import User, { pack, ILocalUser } from '../../../models/user';
-import { IApp } from '../../../models/app';
+import User, { pack } from '../../../models/user';
+import define from '../define';
 
 export const meta = {
 	stability: 'stable',
@@ -18,7 +18,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser, app: IApp) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user, app) => new Promise(async (res, rej) => {
 	const isSecure = user != null && app == null;
 
 	// Serialize
@@ -34,4 +34,4 @@ export default (params: any, user: ILocalUser, app: IApp) => new Promise(async (
 			lastUsedAt: new Date()
 		}
 	});
-});
+}));
diff --git a/src/server/api/endpoints/i/2fa/done.ts b/src/server/api/endpoints/i/2fa/done.ts
index 40b45a3d0b..2ee0c8886e 100644
--- a/src/server/api/endpoints/i/2fa/done.ts
+++ b/src/server/api/endpoints/i/2fa/done.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
 import * as speakeasy from 'speakeasy';
-import User, { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import User from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -15,10 +15,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const _token = ps.token.replace(/\s/g, '');
 
 	if (user.twoFactorTempSecret == null) {
@@ -43,4 +40,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/i/2fa/register.ts b/src/server/api/endpoints/i/2fa/register.ts
index 4d6b05b787..38e3ca7806 100644
--- a/src/server/api/endpoints/i/2fa/register.ts
+++ b/src/server/api/endpoints/i/2fa/register.ts
@@ -2,9 +2,9 @@ import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
 import * as speakeasy from 'speakeasy';
 import * as QRCode from 'qrcode';
-import User, { ILocalUser } from '../../../../../models/user';
+import User from '../../../../../models/user';
 import config from '../../../../../config';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -18,10 +18,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Compare password
 	const same = await bcrypt.compare(ps.password, user.password);
 
@@ -54,4 +51,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 			issuer: config.host
 		});
 	});
-});
+}));
diff --git a/src/server/api/endpoints/i/2fa/unregister.ts b/src/server/api/endpoints/i/2fa/unregister.ts
index e3a1bd43de..2cb48d93cd 100644
--- a/src/server/api/endpoints/i/2fa/unregister.ts
+++ b/src/server/api/endpoints/i/2fa/unregister.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
-import User, { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import User from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -15,10 +15,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Compare password
 	const same = await bcrypt.compare(ps.password, user.password);
 
@@ -34,4 +31,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/i/authorized_apps.ts b/src/server/api/endpoints/i/authorized_apps.ts
index 09bcd2dcb6..c4b992b52f 100644
--- a/src/server/api/endpoints/i/authorized_apps.ts
+++ b/src/server/api/endpoints/i/authorized_apps.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy';
 import AccessToken from '../../../../models/access-token';
 import { pack } from '../../../../models/app';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -27,10 +26,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get tokens
 	const tokens = await AccessToken
 		.find({
@@ -46,4 +42,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await Promise.all(tokens.map(token => pack(token.appId, user, {
 		detail: true
 	}))));
-});
+}));
diff --git a/src/server/api/endpoints/i/change_password.ts b/src/server/api/endpoints/i/change_password.ts
index 818637e224..a2cfc6f70e 100644
--- a/src/server/api/endpoints/i/change_password.ts
+++ b/src/server/api/endpoints/i/change_password.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
-import User, { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import User from '../../../../models/user';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -19,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Compare password
 	const same = await bcrypt.compare(ps.currentPassword, user.password);
 
@@ -41,4 +38,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/i/favorites.ts b/src/server/api/endpoints/i/favorites.ts
index 847ac64d9a..67a3638885 100644
--- a/src/server/api/endpoints/i/favorites.ts
+++ b/src/server/api/endpoints/i/favorites.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Favorite, { packMany } from '../../../../models/favorite';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -31,10 +30,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -67,4 +63,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await packMany(favorites, user));
-});
+}));
diff --git a/src/server/api/endpoints/i/notifications.ts b/src/server/api/endpoints/i/notifications.ts
index d16ba63bdc..b1ddd40d13 100644
--- a/src/server/api/endpoints/i/notifications.ts
+++ b/src/server/api/endpoints/i/notifications.ts
@@ -4,8 +4,7 @@ import Mute from '../../../../models/mute';
 import { packMany } from '../../../../models/notification';
 import { getFriendIds } from '../../common/get-friends';
 import read from '../../common/read-notification';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -45,10 +44,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -105,4 +101,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	if (notifications.length > 0 && ps.markAsRead) {
 		read(user._id, notifications);
 	}
-});
+}));
diff --git a/src/server/api/endpoints/i/pin.ts b/src/server/api/endpoints/i/pin.ts
index 4341906a57..ab8d8a1853 100644
--- a/src/server/api/endpoints/i/pin.ts
+++ b/src/server/api/endpoints/i/pin.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import { ILocalUser } from '../../../../models/user';
 import { pack } from '../../../../models/user';
 import { addPinned } from '../../../../services/i/pin';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -27,10 +26,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Processing
 	try {
 		await addPinned(user, ps.noteId);
@@ -45,4 +41,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 
 	// Send response
 	res(iObj);
-});
+}));
diff --git a/src/server/api/endpoints/i/read_all_unread_notes.ts b/src/server/api/endpoints/i/read_all_unread_notes.ts
index 6a4f72ea29..7d63de4e19 100644
--- a/src/server/api/endpoints/i/read_all_unread_notes.ts
+++ b/src/server/api/endpoints/i/read_all_unread_notes.ts
@@ -1,6 +1,7 @@
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { publishMainStream } from '../../../../stream';
 import NoteUnread from '../../../../models/note-unread';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -16,7 +17,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Remove documents
 	await NoteUnread.remove({
 		userId: user._id
@@ -34,4 +35,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	publishMainStream(user._id, 'readAllUnreadSpecifiedNotes');
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/i/regenerate_token.ts b/src/server/api/endpoints/i/regenerate_token.ts
index 81997362fc..5dfc3cd664 100644
--- a/src/server/api/endpoints/i/regenerate_token.ts
+++ b/src/server/api/endpoints/i/regenerate_token.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy';
 import * as bcrypt from 'bcryptjs';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { publishMainStream } from '../../../../stream';
 import generateUserToken from '../../common/generate-native-user-token';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -17,10 +17,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Compare password
 	const same = await bcrypt.compare(ps.password, user.password);
 
@@ -41,4 +38,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 
 	// Publish event
 	publishMainStream(user._id, 'myTokenRegenerated');
-});
+}));
diff --git a/src/server/api/endpoints/i/signin_history.ts b/src/server/api/endpoints/i/signin_history.ts
index df1cd34c8c..acf9349cd2 100644
--- a/src/server/api/endpoints/i/signin_history.ts
+++ b/src/server/api/endpoints/i/signin_history.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Signin, { pack } from '../../../../models/signin';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -26,10 +25,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -62,4 +58,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Serialize
 	res(await Promise.all(history.map(record => pack(record))));
-});
+}));
diff --git a/src/server/api/endpoints/i/unpin.ts b/src/server/api/endpoints/i/unpin.ts
index 26ff8ccda1..27342fb43c 100644
--- a/src/server/api/endpoints/i/unpin.ts
+++ b/src/server/api/endpoints/i/unpin.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import { ILocalUser } from '../../../../models/user';
 import { pack } from '../../../../models/user';
 import { removePinned } from '../../../../services/i/pin';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -27,10 +26,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Processing
 	try {
 		await removePinned(user, ps.noteId);
@@ -45,4 +41,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 
 	// Send response
 	res(iObj);
-});
+}));
diff --git a/src/server/api/endpoints/i/update.ts b/src/server/api/endpoints/i/update.ts
index 93d4448092..7a16248305 100644
--- a/src/server/api/endpoints/i/update.ts
+++ b/src/server/api/endpoints/i/update.ts
@@ -5,7 +5,7 @@ import DriveFile from '../../../../models/drive-file';
 import acceptAllFollowRequests from '../../../../services/following/requests/accept-all';
 import { IApp } from '../../../../models/app';
 import { publishToFollowers } from '../../../../services/i/update';
-import getParams from '../../get-params';
+import define from '../../define';
 import getDriveFileUrl from '../../../../misc/get-drive-file-url';
 
 export const meta = {
@@ -115,10 +115,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser, app: IApp) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user, app) => new Promise(async (res, rej) => {
 	const isSecure = user != null && app == null;
 
 	const updates = {} as any;
@@ -209,4 +206,4 @@ export default async (params: any, user: ILocalUser, app: IApp) => new Promise(a
 
 	// フォロワーにUpdateを配信
 	publishToFollowers(user._id);
-});
+}));
diff --git a/src/server/api/endpoints/i/update_client_setting.ts b/src/server/api/endpoints/i/update_client_setting.ts
index a1631b1d95..03eb23a5a2 100644
--- a/src/server/api/endpoints/i/update_client_setting.ts
+++ b/src/server/api/endpoints/i/update_client_setting.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { publishMainStream } from '../../../../stream';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -19,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const x: any = {};
 	x[`clientSettings.${name}`] = ps.value;
 
@@ -37,4 +34,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 		key: name,
 		value: ps.value
 	});
-});
+}));
diff --git a/src/server/api/endpoints/i/update_home.ts b/src/server/api/endpoints/i/update_home.ts
index eadd0290ab..f472600ee0 100644
--- a/src/server/api/endpoints/i/update_home.ts
+++ b/src/server/api/endpoints/i/update_home.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { publishMainStream } from '../../../../stream';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -20,10 +20,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	await User.update(user._id, {
 		$set: {
 			'clientSettings.home': ps.home
@@ -33,4 +30,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	res();
 
 	publishMainStream(user._id, 'homeUpdated', ps.home);
-});
+}));
diff --git a/src/server/api/endpoints/i/update_mobile_home.ts b/src/server/api/endpoints/i/update_mobile_home.ts
index c886574f23..792c4b7877 100644
--- a/src/server/api/endpoints/i/update_mobile_home.ts
+++ b/src/server/api/endpoints/i/update_mobile_home.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { publishMainStream } from '../../../../stream';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -19,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	await User.update(user._id, {
 		$set: {
 			'clientSettings.mobileHome': ps.home
@@ -32,4 +29,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	res();
 
 	publishMainStream(user._id, 'mobileHomeUpdated', ps.home);
-});
+}));
diff --git a/src/server/api/endpoints/i/update_widget.ts b/src/server/api/endpoints/i/update_widget.ts
index 947a29074c..90fe8fbe23 100644
--- a/src/server/api/endpoints/i/update_widget.ts
+++ b/src/server/api/endpoints/i/update_widget.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { publishMainStream } from '../../../../stream';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -19,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	if (ps.id == null && ps.data == null) return rej('you need to set id and data params if home param unset');
 
 	let widget;
@@ -88,4 +85,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 	} else {
 		rej('widget not found');
 	}
-});
+}));
diff --git a/src/server/api/endpoints/messaging/history.ts b/src/server/api/endpoints/messaging/history.ts
index 078af21f27..c026e5dd91 100644
--- a/src/server/api/endpoints/messaging/history.ts
+++ b/src/server/api/endpoints/messaging/history.ts
@@ -2,8 +2,7 @@ import $ from 'cafy';
 import History from '../../../../models/messaging-history';
 import Mute from '../../../../models/mute';
 import { pack } from '../../../../models/messaging-message';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -23,10 +22,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const mute = await Mute.find({
 		muterId: user._id,
 		deletedAt: { $exists: false }
@@ -47,4 +43,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await Promise.all(history.map(h => pack(h.messageId, user))));
-});
+}));
diff --git a/src/server/api/endpoints/messaging/messages.ts b/src/server/api/endpoints/messaging/messages.ts
index 43d96e2ee4..50a5eb00d8 100644
--- a/src/server/api/endpoints/messaging/messages.ts
+++ b/src/server/api/endpoints/messaging/messages.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Message from '../../../../models/messaging-message';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import { pack } from '../../../../models/messaging-message';
 import read from '../../common/read-messaging-message';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -43,10 +43,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -108,4 +105,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	if (ps.markAsRead) {
 		read(user._id, recipient._id, messages);
 	}
-});
+}));
diff --git a/src/server/api/endpoints/messaging/messages/create.ts b/src/server/api/endpoints/messaging/messages/create.ts
index ff44e192d1..bcd4d6b63c 100644
--- a/src/server/api/endpoints/messaging/messages/create.ts
+++ b/src/server/api/endpoints/messaging/messages/create.ts
@@ -2,14 +2,14 @@ import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id
 import Message from '../../../../../models/messaging-message';
 import { isValidText } from '../../../../../models/messaging-message';
 import History from '../../../../../models/messaging-history';
-import User, { ILocalUser } from '../../../../../models/user';
+import User from '../../../../../models/user';
 import Mute from '../../../../../models/mute';
 import DriveFile from '../../../../../models/drive-file';
 import { pack } from '../../../../../models/messaging-message';
 import { publishMainStream } from '../../../../../stream';
 import { publishMessagingStream, publishMessagingIndexStream } from '../../../../../stream';
 import pushSw from '../../../../../push-sw';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -38,10 +38,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Myself
 	if (ps.userId.equals(user._id)) {
 		return rej('cannot send message to myself');
@@ -155,4 +152,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	}, {
 		upsert: true
 	});
-});
+}));
diff --git a/src/server/api/endpoints/messaging/messages/read.ts b/src/server/api/endpoints/messaging/messages/read.ts
index 122034fdf0..eb1799cfc6 100644
--- a/src/server/api/endpoints/messaging/messages/read.ts
+++ b/src/server/api/endpoints/messaging/messages/read.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import Message from '../../../../../models/messaging-message';
-import { ILocalUser } from '../../../../../models/user';
 import read from '../../../common/read-messaging-message';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -26,10 +25,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const message = await Message.findOne({
 		_id: ps.messageId,
 		recipientId: user._id
@@ -42,4 +38,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	read(user._id, message.userId, message);
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/meta.ts b/src/server/api/endpoints/meta.ts
index e33023b07b..be42c070ec 100644
--- a/src/server/api/endpoints/meta.ts
+++ b/src/server/api/endpoints/meta.ts
@@ -2,9 +2,8 @@ import $ from 'cafy';
 import * as os from 'os';
 import config from '../../../config';
 import Meta from '../../../models/meta';
-import { ILocalUser } from '../../../models/user';
 import Emoji from '../../../models/emoji';
-import getParams from '../get-params';
+import define from '../define';
 
 const pkg = require('../../../../package.json');
 const client = require('../../../../built/client/meta.json');
@@ -27,10 +26,7 @@ export const meta = {
 	},
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	const met: any = (await Meta.findOne()) || {};
 
 	const emojis = await Emoji.find({ host: null });
@@ -76,4 +72,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 			userRecommendation: config.user_recommendation ? config.user_recommendation : {}
 		} : undefined
 	});
-});
+}));
diff --git a/src/server/api/endpoints/mute/create.ts b/src/server/api/endpoints/mute/create.ts
index 442d3f51d8..f3bb3da14f 100644
--- a/src/server/api/endpoints/mute/create.ts
+++ b/src/server/api/endpoints/mute/create.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import Mute from '../../../../models/mute';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const muter = user;
 
 	// 自分自身
@@ -64,4 +61,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/mute/delete.ts b/src/server/api/endpoints/mute/delete.ts
index c1d4f35425..68de0feb28 100644
--- a/src/server/api/endpoints/mute/delete.ts
+++ b/src/server/api/endpoints/mute/delete.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import Mute from '../../../../models/mute';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const muter = user;
 
 	// Check if the mutee is yourself
@@ -62,4 +59,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/mute/list.ts b/src/server/api/endpoints/mute/list.ts
index e33e709773..c337ba4ec9 100644
--- a/src/server/api/endpoints/mute/list.ts
+++ b/src/server/api/endpoints/mute/list.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Mute, { packMany } from '../../../../models/mute';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -31,10 +30,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -66,4 +62,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 		});
 
 	res(await packMany(mutes, me));
-});
+}));
diff --git a/src/server/api/endpoints/my/apps.ts b/src/server/api/endpoints/my/apps.ts
index 0b051f600c..646ffcc263 100644
--- a/src/server/api/endpoints/my/apps.ts
+++ b/src/server/api/endpoints/my/apps.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy';
 import App, { pack } from '../../../../models/app';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -24,10 +23,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const query = {
 		userId: user._id
 	};
@@ -46,4 +42,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await Promise.all(apps.map(app => pack(app, user, {
 		detail: true
 	}))));
-});
+}));
diff --git a/src/server/api/endpoints/notes.ts b/src/server/api/endpoints/notes.ts
index 83776c59d0..5edc56165e 100644
--- a/src/server/api/endpoints/notes.ts
+++ b/src/server/api/endpoints/notes.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../misc/cafy-id';
 import Note, { packMany } from '../../../models/note';
-import getParams from '../get-params';
+import define from '../define';
 
 export const meta = {
 	desc: {
@@ -67,10 +67,7 @@ export const meta = {
 	}
 };
 
-export default (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -130,4 +127,4 @@ export default (params: any) => new Promise(async (res, rej) => {
 
 	// Serialize
 	res(await packMany(notes));
-});
+}));
diff --git a/src/server/api/endpoints/notes/conversation.ts b/src/server/api/endpoints/notes/conversation.ts
index c7be6d6e3f..7703ef7d2e 100644
--- a/src/server/api/endpoints/notes/conversation.ts
+++ b/src/server/api/endpoints/notes/conversation.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note, { packMany, INote } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -29,10 +28,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Lookup note
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -67,4 +63,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	}
 
 	res(await packMany(conversation, user));
-});
+}));
diff --git a/src/server/api/endpoints/notes/create.ts b/src/server/api/endpoints/notes/create.ts
index 9eff8c27bf..8a8813daba 100644
--- a/src/server/api/endpoints/notes/create.ts
+++ b/src/server/api/endpoints/notes/create.ts
@@ -1,11 +1,10 @@
 import $ from 'cafy'; import ID, { transform, transformMany } from '../../../../misc/cafy-id';
 const ms = require('ms');
 import Note, { INote, isValidText, isValidCw, pack } from '../../../../models/note';
-import User, { ILocalUser, IUser } from '../../../../models/user';
+import User, { IUser } from '../../../../models/user';
 import DriveFile, { IDriveFile } from '../../../../models/drive-file';
 import create from '../../../../services/note/create';
-import { IApp } from '../../../../models/app';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -139,10 +138,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser, app: IApp) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user, app) => new Promise(async (res, rej) => {
 	let visibleUsers: IUser[] = [];
 	if (ps.visibleUserIds) {
 		visibleUsers = await Promise.all(ps.visibleUserIds.map(id => User.findOne({
@@ -229,4 +225,4 @@ export default (params: any, user: ILocalUser, app: IApp) => new Promise(async (
 	res({
 		createdNote: noteObj
 	});
-});
+}));
diff --git a/src/server/api/endpoints/notes/delete.ts b/src/server/api/endpoints/notes/delete.ts
index 580cb344e1..a8f22ad405 100644
--- a/src/server/api/endpoints/notes/delete.ts
+++ b/src/server/api/endpoints/notes/delete.ts
@@ -1,8 +1,8 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
 import deleteNote from '../../../../services/note/delete';
-import User, { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import User from '../../../../models/user';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -28,10 +28,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch note
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -48,4 +45,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	await deleteNote(await User.findOne({ _id: note.userId }), note);
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/notes/favorites/create.ts b/src/server/api/endpoints/notes/favorites/create.ts
index e489c77761..a50b5002c2 100644
--- a/src/server/api/endpoints/notes/favorites/create.ts
+++ b/src/server/api/endpoints/notes/favorites/create.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import Favorite from '../../../../../models/favorite';
 import Note from '../../../../../models/note';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -28,10 +27,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get favoritee
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -60,4 +56,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Send response
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/notes/favorites/delete.ts b/src/server/api/endpoints/notes/favorites/delete.ts
index ac1b35d194..0aad61fedd 100644
--- a/src/server/api/endpoints/notes/favorites/delete.ts
+++ b/src/server/api/endpoints/notes/favorites/delete.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import Favorite from '../../../../../models/favorite';
 import Note from '../../../../../models/note';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -28,10 +27,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get favoritee
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -58,4 +54,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Send response
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/notes/featured.ts b/src/server/api/endpoints/notes/featured.ts
index c031308824..823137ac21 100644
--- a/src/server/api/endpoints/notes/featured.ts
+++ b/src/server/api/endpoints/notes/featured.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy';
 import Note from '../../../../models/note';
 import { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -23,10 +22,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const day = 1000 * 60 * 60 * 24;
 
 	const notes = await Note
@@ -46,5 +42,5 @@ export default async (params: any, user: ILocalUser) => {
 			}
 		});
 
-	return await packMany(notes, user);
-};
+	res(await packMany(notes, user));
+}));
diff --git a/src/server/api/endpoints/notes/global-timeline.ts b/src/server/api/endpoints/notes/global-timeline.ts
index fa7a76f12e..b7f765f27d 100644
--- a/src/server/api/endpoints/notes/global-timeline.ts
+++ b/src/server/api/endpoints/notes/global-timeline.ts
@@ -2,8 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
 import Mute from '../../../../models/mute';
 import { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 import { countIf } from '../../../../prelude/array';
 
 export const meta = {
@@ -51,13 +50,10 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if only one of sinceId, untilId, sinceDate, untilDate specified
 	if (countIf(x => x != null, [ps.sinceId, ps.untilId, ps.sinceDate, ps.untilDate]) > 1) {
-		throw 'only one of sinceId, untilId, sinceDate, untilDate can be specified';
+		return rej('only one of sinceId, untilId, sinceDate, untilDate can be specified');
 	}
 
 	// ミュートしているユーザーを取得
@@ -120,13 +116,11 @@ export default async (params: any, user: ILocalUser) => {
 	}
 	//#endregion
 
-	// Issue query
 	const timeline = await Note
 		.find(query, {
 			limit: ps.limit,
 			sort: sort
 		});
 
-	// Serialize
-	return await packMany(timeline, user);
-};
+	res(await packMany(timeline, user));
+}));
diff --git a/src/server/api/endpoints/notes/hybrid-timeline.ts b/src/server/api/endpoints/notes/hybrid-timeline.ts
index 0008144823..4af182cb5c 100644
--- a/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -3,8 +3,7 @@ import Note from '../../../../models/note';
 import Mute from '../../../../models/mute';
 import { getFriends } from '../../common/get-friends';
 import { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 import { countIf } from '../../../../prelude/array';
 
 export const meta = {
@@ -91,13 +90,10 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if only one of sinceId, untilId, sinceDate, untilDate specified
 	if (countIf(x => x != null, [ps.sinceId, ps.untilId, ps.sinceDate, ps.untilDate]) > 1) {
-		throw 'only one of sinceId, untilId, sinceDate, untilDate can be specified';
+		return rej('only one of sinceId, untilId, sinceDate, untilDate can be specified');
 	}
 
 	const [followings, mutedUserIds] = await Promise.all([
@@ -246,13 +242,11 @@ export default async (params: any, user: ILocalUser) => {
 	}
 	//#endregion
 
-	// Issue query
 	const timeline = await Note
 		.find(query, {
 			limit: ps.limit,
 			sort: sort
 		});
 
-	// Serialize
-	return await packMany(timeline, user);
-};
+	res(await packMany(timeline, user));
+}));
diff --git a/src/server/api/endpoints/notes/local-timeline.ts b/src/server/api/endpoints/notes/local-timeline.ts
index 78ddf00626..4446f52cdc 100644
--- a/src/server/api/endpoints/notes/local-timeline.ts
+++ b/src/server/api/endpoints/notes/local-timeline.ts
@@ -2,8 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
 import Mute from '../../../../models/mute';
 import { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 import { countIf } from '../../../../prelude/array';
 
 export const meta = {
@@ -66,13 +65,10 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if only one of sinceId, untilId, sinceDate, untilDate specified
 	if (countIf(x => x != null, [ps.sinceId, ps.untilId, ps.sinceDate, ps.untilDate]) > 1) {
-		throw 'only one of sinceId, untilId, sinceDate, untilDate can be specified';
+		return rej('only one of sinceId, untilId, sinceDate, untilDate can be specified');
 	}
 
 	// ミュートしているユーザーを取得
@@ -150,13 +146,11 @@ export default async (params: any, user: ILocalUser) => {
 	}
 	//#endregion
 
-	// Issue query
 	const timeline = await Note
 		.find(query, {
 			limit: ps.limit,
 			sort: sort
 		});
 
-	// Serialize
-	return await packMany(timeline, user);
-};
+	res(await packMany(timeline, user));
+}));
diff --git a/src/server/api/endpoints/notes/mentions.ts b/src/server/api/endpoints/notes/mentions.ts
index 3fc3977075..718f5e4403 100644
--- a/src/server/api/endpoints/notes/mentions.ts
+++ b/src/server/api/endpoints/notes/mentions.ts
@@ -2,8 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
 import { getFriendIds } from '../../common/get-friends';
 import { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 import read from '../../../../services/note/read';
 
 export const meta = {
@@ -41,10 +40,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -96,4 +92,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await packMany(mentions, user));
 
 	mentions.forEach(note => read(user._id, note._id));
-});
+}));
diff --git a/src/server/api/endpoints/notes/polls/recommendation.ts b/src/server/api/endpoints/notes/polls/recommendation.ts
index 34250a32f9..cfcba788ec 100644
--- a/src/server/api/endpoints/notes/polls/recommendation.ts
+++ b/src/server/api/endpoints/notes/polls/recommendation.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy';
 import Vote from '../../../../../models/poll-vote';
 import Note, { pack } from '../../../../../models/note';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -25,10 +24,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get votes
 	const votes = await Vote.find({
 		userId: user._id
@@ -64,4 +60,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await Promise.all(notes.map(note => pack(note, user, {
 		detail: true
 	}))));
-});
+}));
diff --git a/src/server/api/endpoints/notes/polls/vote.ts b/src/server/api/endpoints/notes/polls/vote.ts
index 32dcefec7b..f50e84ba13 100644
--- a/src/server/api/endpoints/notes/polls/vote.ts
+++ b/src/server/api/endpoints/notes/polls/vote.ts
@@ -5,8 +5,7 @@ import Watching from '../../../../../models/note-watching';
 import watch from '../../../../../services/note/watch';
 import { publishNoteStream } from '../../../../../stream';
 import notify from '../../../../../notify';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -30,10 +29,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get votee
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -114,4 +110,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	if (user.settings.autoWatch !== false) {
 		watch(user._id, note);
 	}
-});
+}));
diff --git a/src/server/api/endpoints/notes/reactions.ts b/src/server/api/endpoints/notes/reactions.ts
index 1ab5afaba1..a1b249638f 100644
--- a/src/server/api/endpoints/notes/reactions.ts
+++ b/src/server/api/endpoints/notes/reactions.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
 import Reaction, { pack } from '../../../../models/note-reaction';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -44,10 +43,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -90,4 +86,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Serialize
 	res(await Promise.all(reactions.map(reaction => pack(reaction, user))));
-});
+}));
diff --git a/src/server/api/endpoints/notes/reactions/create.ts b/src/server/api/endpoints/notes/reactions/create.ts
index f2b06473a5..c9f70d9658 100644
--- a/src/server/api/endpoints/notes/reactions/create.ts
+++ b/src/server/api/endpoints/notes/reactions/create.ts
@@ -2,8 +2,7 @@ import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id
 import Note from '../../../../../models/note';
 import create from '../../../../../services/note/reaction/create';
 import { validateReaction } from '../../../../../models/note-reaction';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -35,10 +34,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch reactee
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -59,4 +55,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	}
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/notes/reactions/delete.ts b/src/server/api/endpoints/notes/reactions/delete.ts
index 2a2577dfe6..60f49fb275 100644
--- a/src/server/api/endpoints/notes/reactions/delete.ts
+++ b/src/server/api/endpoints/notes/reactions/delete.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import Reaction from '../../../../../models/note-reaction';
 import Note from '../../../../../models/note';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -22,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch unreactee
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -64,4 +60,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	Note.update({ _id: note._id }, {
 		$inc: dec
 	});
-});
+}));
diff --git a/src/server/api/endpoints/notes/renotes.ts b/src/server/api/endpoints/notes/renotes.ts
index ff926806eb..85d5820e58 100644
--- a/src/server/api/endpoints/notes/renotes.ts
+++ b/src/server/api/endpoints/notes/renotes.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note, { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -34,10 +33,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if both of sinceId and untilId is specified
 	if (ps.sinceId && ps.untilId) {
 		return rej('cannot set sinceId and untilId');
@@ -78,4 +74,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	res(await packMany(renotes, user));
-});
+}));
diff --git a/src/server/api/endpoints/notes/replies.ts b/src/server/api/endpoints/notes/replies.ts
index 86a75c1cab..8b5a3593d1 100644
--- a/src/server/api/endpoints/notes/replies.ts
+++ b/src/server/api/endpoints/notes/replies.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note, { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -29,10 +28,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Lookup note
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -45,4 +41,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	const ids = (note._replyIds || []).slice(ps.offset, ps.offset + ps.limit);
 
 	res(await packMany(ids, user));
-});
+}));
diff --git a/src/server/api/endpoints/notes/search.ts b/src/server/api/endpoints/notes/search.ts
index 63a87c0f56..e107ca4e15 100644
--- a/src/server/api/endpoints/notes/search.ts
+++ b/src/server/api/endpoints/notes/search.ts
@@ -1,10 +1,9 @@
 import $ from 'cafy';
 import * as mongo from 'mongodb';
 import Note from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
 import { packMany } from '../../../../models/note';
 import es from '../../../../db/elasticsearch';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -31,10 +30,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	if (es == null) return rej('searching not available');
 
 	es.search({
@@ -79,4 +75,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 
 		res(await packMany(notes, me));
 	});
-});
+}));
diff --git a/src/server/api/endpoints/notes/search_by_tag.ts b/src/server/api/endpoints/notes/search_by_tag.ts
index 99a6dce834..fcc33d14f3 100644
--- a/src/server/api/endpoints/notes/search_by_tag.ts
+++ b/src/server/api/endpoints/notes/search_by_tag.ts
@@ -1,10 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
 import Mute from '../../../../models/mute';
 import { getFriendIds } from '../../common/get-friends';
 import { packMany } from '../../../../models/note';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -103,10 +102,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	const q: any = {
 		$and: [ps.tag ? {
 			tagsLower: ps.tag.toLowerCase()
@@ -322,4 +318,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 
 	// Serialize
 	res(await packMany(notes, me));
-});
+}));
diff --git a/src/server/api/endpoints/notes/show.ts b/src/server/api/endpoints/notes/show.ts
index 8b426c0053..53246102d0 100644
--- a/src/server/api/endpoints/notes/show.ts
+++ b/src/server/api/endpoints/notes/show.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note, { pack } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	stability: 'stable',
@@ -25,10 +24,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Get note
 	const note = await Note.findOne({
 		_id: ps.noteId
@@ -42,4 +38,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	res(await pack(note, user, {
 		detail: true
 	}));
-});
+}));
diff --git a/src/server/api/endpoints/notes/timeline.ts b/src/server/api/endpoints/notes/timeline.ts
index 8834645fc8..3c970c03a1 100644
--- a/src/server/api/endpoints/notes/timeline.ts
+++ b/src/server/api/endpoints/notes/timeline.ts
@@ -3,8 +3,7 @@ import Note from '../../../../models/note';
 import Mute from '../../../../models/mute';
 import { getFriends } from '../../common/get-friends';
 import { packMany } from '../../../../models/note';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 import { countIf } from '../../../../prelude/array';
 
 export const meta = {
@@ -94,13 +93,11 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Check if only one of sinceId, untilId, sinceDate, untilDate specified
 	if (countIf(x => x != null, [ps.sinceId, ps.untilId, ps.sinceDate, ps.untilDate]) > 1) {
-		throw 'only one of sinceId, untilId, sinceDate, untilDate can be specified';
+		rej('only one of sinceId, untilId, sinceDate, untilDate can be specified');
+		return;
 	}
 
 	const [followings, mutedUserIds] = await Promise.all([
@@ -251,5 +248,5 @@ export default async (params: any, user: ILocalUser) => {
 		});
 
 	// Serialize
-	return await packMany(timeline, user);
-};
+	res(await packMany(timeline, user));
+}));
diff --git a/src/server/api/endpoints/notes/user-list-timeline.ts b/src/server/api/endpoints/notes/user-list-timeline.ts
index 3bdcc6c121..156ffbbc32 100644
--- a/src/server/api/endpoints/notes/user-list-timeline.ts
+++ b/src/server/api/endpoints/notes/user-list-timeline.ts
@@ -3,8 +3,7 @@ import Note from '../../../../models/note';
 import Mute from '../../../../models/mute';
 import { packMany } from '../../../../models/note';
 import UserList from '../../../../models/user-list';
-import { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -101,10 +100,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) throw psErr;
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const [list, mutedUserIds] = await Promise.all([
 		// リストを取得
 		// Fetch the list
@@ -120,7 +116,8 @@ export default async (params: any, user: ILocalUser) => {
 	]);
 
 	if (list.userIds.length == 0) {
-		return [];
+		res([]);
+		return;
 	}
 
 	//#region Construct query
@@ -258,5 +255,5 @@ export default async (params: any, user: ILocalUser) => {
 		});
 
 	// Serialize
-	return await packMany(timeline, user);
-};
+	res(await packMany(timeline, user));
+}));
diff --git a/src/server/api/endpoints/notifications/mark_all_as_read.ts b/src/server/api/endpoints/notifications/mark_all_as_read.ts
index 6487cd8b48..1b5208d447 100644
--- a/src/server/api/endpoints/notifications/mark_all_as_read.ts
+++ b/src/server/api/endpoints/notifications/mark_all_as_read.ts
@@ -1,6 +1,7 @@
 import Notification from '../../../../models/notification';
 import { publishMainStream } from '../../../../stream';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -13,10 +14,7 @@ export const meta = {
 	kind: 'notification-write'
 };
 
-/**
- * Mark all notifications as read
- */
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Update documents
 	await Notification.update({
 		notifieeId: user._id,
@@ -41,4 +39,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// 全ての通知を読みましたよというイベントを発行
 	publishMainStream(user._id, 'readAllNotifications');
-});
+}));
diff --git a/src/server/api/endpoints/stats.ts b/src/server/api/endpoints/stats.ts
index fc195da22d..56549848dc 100644
--- a/src/server/api/endpoints/stats.ts
+++ b/src/server/api/endpoints/stats.ts
@@ -1,10 +1,19 @@
 import Meta from '../../../models/meta';
+import define from '../define';
 
-/**
- * Get the misskey's statistics
- */
-export default () => new Promise(async (res, rej) => {
+export const meta = {
+	requireCredential: false,
+
+	desc: {
+		'en-US': 'Get the instance\'s statistics'
+	},
+
+	params: {
+	}
+};
+
+export default define(meta, () => new Promise(async (res, rej) => {
 	const meta = await Meta.findOne();
 
 	res(meta ? meta.stats : {});
-});
+}));
diff --git a/src/server/api/endpoints/sw/register.ts b/src/server/api/endpoints/sw/register.ts
index 69337bd8c0..26427452fd 100644
--- a/src/server/api/endpoints/sw/register.ts
+++ b/src/server/api/endpoints/sw/register.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy';
 import Subscription from '../../../../models/sw-subscription';
-import { ILocalUser } from '../../../../models/user';
 import config from '../../../../config';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: true,
@@ -22,10 +21,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// if already subscribed
 	const exist = await Subscription.findOne({
 		userId: user._id,
@@ -53,4 +49,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 		state: 'subscribed',
 		key: config.sw.public_key
 	});
-});
+}));
diff --git a/src/server/api/endpoints/username/available.ts b/src/server/api/endpoints/username/available.ts
index b61be84c3b..a5f0b5943f 100644
--- a/src/server/api/endpoints/username/available.ts
+++ b/src/server/api/endpoints/username/available.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
 import User from '../../../../models/user';
 import { validateUsername } from '../../../../models/user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: false,
@@ -13,10 +13,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps) => new Promise(async (res, rej) => {
 	// Get exist
 	const exist = await User
 		.count({
@@ -30,4 +27,4 @@ export default async (params: any) => new Promise(async (res, rej) => {
 	res({
 		available: exist === 0
 	});
-});
+}));
diff --git a/src/server/api/endpoints/users.ts b/src/server/api/endpoints/users.ts
index 81751504e7..6fb50e6712 100644
--- a/src/server/api/endpoints/users.ts
+++ b/src/server/api/endpoints/users.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy';
 import User, { pack, ILocalUser } from '../../../models/user';
-import getParams from '../get-params';
+import define from '../define';
 
 export const meta = {
 	requireCredential: false,
@@ -22,10 +22,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	let _sort;
 	if (ps.sort) {
 		if (ps.sort == '+follower') {
@@ -53,4 +50,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 		});
 
 	res(await Promise.all(users.map(user => pack(user, me))));
-});
+}));
diff --git a/src/server/api/endpoints/users/followers.ts b/src/server/api/endpoints/users/followers.ts
index 71081835c7..9e3a30f6f1 100644
--- a/src/server/api/endpoints/users/followers.ts
+++ b/src/server/api/endpoints/users/followers.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import Following from '../../../../models/following';
 import { pack } from '../../../../models/user';
 import { getFriendIds } from '../../common/get-friends';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -37,10 +37,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Lookup user
 	const user = await User.findOne({
 		_id: ps.userId
@@ -95,4 +92,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 		users: users,
 		next: inStock ? following[following.length - 1]._id : null,
 	});
-});
+}));
diff --git a/src/server/api/endpoints/users/following.ts b/src/server/api/endpoints/users/following.ts
index 778ef54a27..57bf1e1e8b 100644
--- a/src/server/api/endpoints/users/following.ts
+++ b/src/server/api/endpoints/users/following.ts
@@ -1,9 +1,9 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
-import User, { ILocalUser } from '../../../../models/user';
+import User from '../../../../models/user';
 import Following from '../../../../models/following';
 import { pack } from '../../../../models/user';
 import { getFriendIds } from '../../common/get-friends';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -37,10 +37,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Lookup user
 	const user = await User.findOne({
 		_id: ps.userId
@@ -95,4 +92,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 		users: users,
 		next: inStock ? following[following.length - 1]._id : null,
 	});
-});
+}));
diff --git a/src/server/api/endpoints/users/get_frequently_replied_users.ts b/src/server/api/endpoints/users/get_frequently_replied_users.ts
index b0fd259588..6b8b985eea 100644
--- a/src/server/api/endpoints/users/get_frequently_replied_users.ts
+++ b/src/server/api/endpoints/users/get_frequently_replied_users.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import Note from '../../../../models/note';
-import User, { pack, ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import User, { pack } from '../../../../models/user';
+import define from '../../define';
 
 export const meta = {
 	requireCredential: false,
@@ -19,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Lookup user
 	const user = await User.findOne({
 		_id: ps.userId
@@ -104,4 +101,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 	})));
 
 	res(repliesObj);
-});
+}));
diff --git a/src/server/api/endpoints/users/lists/create.ts b/src/server/api/endpoints/users/lists/create.ts
index c14bb64daa..d93cf13d94 100644
--- a/src/server/api/endpoints/users/lists/create.ts
+++ b/src/server/api/endpoints/users/lists/create.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy';
 import UserList, { pack } from '../../../../../models/user-list';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -20,10 +19,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// insert
 	const userList = await UserList.insert({
 		createdAt: new Date(),
@@ -34,4 +30,4 @@ export default async (params: any, user: ILocalUser) => new Promise(async (res,
 
 	// Response
 	res(await pack(userList));
-});
+}));
diff --git a/src/server/api/endpoints/users/lists/delete.ts b/src/server/api/endpoints/users/lists/delete.ts
index 1d4513a822..8d297198c9 100644
--- a/src/server/api/endpoints/users/lists/delete.ts
+++ b/src/server/api/endpoints/users/lists/delete.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy';
 import ID, { transform } from '../../../../../misc/cafy-id';
 import UserList from '../../../../../models/user-list';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -26,10 +25,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	const userList = await UserList.findOne({
 		_id: ps.listId,
 		userId: user._id
@@ -44,4 +40,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 	});
 
 	res();
-});
+}));
diff --git a/src/server/api/endpoints/users/lists/list.ts b/src/server/api/endpoints/users/lists/list.ts
index 966e1d3ad9..8f9775e19b 100644
--- a/src/server/api/endpoints/users/lists/list.ts
+++ b/src/server/api/endpoints/users/lists/list.ts
@@ -1,5 +1,5 @@
 import UserList, { pack } from '../../../../../models/user-list';
-import { ILocalUser } from '../../../../../models/user';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -11,11 +11,11 @@ export const meta = {
 	kind: 'account-read'
 };
 
-export default async (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Fetch lists
 	const userLists = await UserList.find({
 		userId: me._id,
 	});
 
 	res(await Promise.all(userLists.map(x => pack(x))));
-});
+}));
diff --git a/src/server/api/endpoints/users/lists/push.ts b/src/server/api/endpoints/users/lists/push.ts
index 8208e627ed..5c11f25dc4 100644
--- a/src/server/api/endpoints/users/lists/push.ts
+++ b/src/server/api/endpoints/users/lists/push.ts
@@ -1,11 +1,11 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import UserList from '../../../../../models/user-list';
-import User, { pack as packUser, isRemoteUser, getGhost, ILocalUser } from '../../../../../models/user';
+import User, { pack as packUser, isRemoteUser, getGhost } from '../../../../../models/user';
 import { publishUserListStream } from '../../../../../stream';
 import ap from '../../../../../remote/activitypub/renderer';
 import renderFollow from '../../../../../remote/activitypub/renderer/follow';
 import { deliver } from '../../../../../queue';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -30,10 +30,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Fetch the list
 	const userList = await UserList.findOne({
 		_id: ps.listId,
@@ -74,4 +71,4 @@ export default async (params: any, me: ILocalUser) => new Promise(async (res, re
 		const content = ap(renderFollow(ghost, user));
 		deliver(ghost, content, user.inbox);
 	}
-});
+}));
diff --git a/src/server/api/endpoints/users/lists/show.ts b/src/server/api/endpoints/users/lists/show.ts
index 585833a2fe..2662ab2769 100644
--- a/src/server/api/endpoints/users/lists/show.ts
+++ b/src/server/api/endpoints/users/lists/show.ts
@@ -1,7 +1,6 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../../misc/cafy-id';
 import UserList, { pack } from '../../../../../models/user-list';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -21,10 +20,7 @@ export const meta = {
 	}
 };
 
-export default async (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	// Fetch the list
 	const userList = await UserList.findOne({
 		_id: ps.listId,
@@ -36,4 +32,4 @@ export default async (params: any, me: ILocalUser) => new Promise(async (res, re
 	}
 
 	res(await pack(userList));
-});
+}));
diff --git a/src/server/api/endpoints/users/lists/update.ts b/src/server/api/endpoints/users/lists/update.ts
index fb1a37b2f1..79a7da5658 100644
--- a/src/server/api/endpoints/users/lists/update.ts
+++ b/src/server/api/endpoints/users/lists/update.ts
@@ -1,8 +1,7 @@
 import $ from 'cafy';
 import ID, { transform } from '../../../../../misc/cafy-id';
 import UserList, { pack } from '../../../../../models/user-list';
-import { ILocalUser } from '../../../../../models/user';
-import getParams from '../../../get-params';
+import define from '../../../define';
 
 export const meta = {
 	desc: {
@@ -34,10 +33,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, user: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, user) => new Promise(async (res, rej) => {
 	// Fetch the list
 	const userList = await UserList.findOne({
 		_id: ps.listId,
@@ -57,4 +53,4 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 
 	// Response
 	res(await pack(userList._id));
-});
+}));
diff --git a/src/server/api/endpoints/users/notes.ts b/src/server/api/endpoints/users/notes.ts
index ac6601f64f..4bbacab2bf 100644
--- a/src/server/api/endpoints/users/notes.ts
+++ b/src/server/api/endpoints/users/notes.ts
@@ -1,8 +1,8 @@
 import $ from 'cafy'; import ID, { transform } from '../../../../misc/cafy-id';
 import getHostLower from '../../common/get-host-lower';
 import Note, { packMany } from '../../../../models/note';
-import User, { ILocalUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import User from '../../../../models/user';
+import define from '../../define';
 import { countIf } from '../../../../prelude/array';
 
 export const meta = {
@@ -126,10 +126,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	if (ps.userId === undefined && ps.username === undefined) {
 		return rej('userId or username is required');
 	}
@@ -215,4 +212,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 
 	// Serialize
 	res(await packMany(notes, me));
-});
+}));
diff --git a/src/server/api/endpoints/users/recommendation.ts b/src/server/api/endpoints/users/recommendation.ts
index 47c809ee4c..127029f83c 100644
--- a/src/server/api/endpoints/users/recommendation.ts
+++ b/src/server/api/endpoints/users/recommendation.ts
@@ -1,11 +1,11 @@
 const ms = require('ms');
 import $ from 'cafy';
-import User, { pack, ILocalUser } from '../../../../models/user';
+import User, { pack } from '../../../../models/user';
 import { getFriendIds } from '../../common/get-friends';
 import Mute from '../../../../models/mute';
 import * as request from 'request';
 import config from '../../../../config';
-import getParams from '../../get-params';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -29,22 +29,19 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	if (config.user_recommendation && config.user_recommendation.external) {
 		const userName = me.username;
 		const hostName = config.hostname;
-		const limit = params.limit;
-		const offset = params.offset;
+		const limit = ps.limit;
+		const offset = ps.offset;
 		const timeout = config.user_recommendation.timeout;
 		const engine = config.user_recommendation.engine;
 		const url = engine
 			.replace('{{host}}', hostName)
 			.replace('{{user}}', userName)
-			.replace('{{limit}}', limit)
-			.replace('{{offset}}', offset);
+			.replace('{{limit}}', limit.toString())
+			.replace('{{offset}}', offset.toString());
 
 		request({
 			url: url,
@@ -89,4 +86,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 
 		res(await Promise.all(users.map(user => pack(user, me, { detail: true }))));
 	}
-});
+}));
diff --git a/src/server/api/endpoints/users/relation.ts b/src/server/api/endpoints/users/relation.ts
index 19643ceed0..c63ec337bf 100644
--- a/src/server/api/endpoints/users/relation.ts
+++ b/src/server/api/endpoints/users/relation.ts
@@ -1,6 +1,6 @@
 import $ from 'cafy'; import ID, { transform, ObjectId } from '../../../../misc/cafy-id';
-import { ILocalUser, getRelation } from '../../../../models/user';
-import getParams from '../../get-params';
+import { getRelation } from '../../../../models/user';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -20,13 +20,10 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	const ids = Array.isArray(ps.userId) ? ps.userId : [ps.userId];
 
 	const relations = await Promise.all(ids.map(id => getRelation(me._id, id)));
 
 	res(Array.isArray(ps.userId) ? relations : relations[0]);
-});
+}));
diff --git a/src/server/api/endpoints/users/search.ts b/src/server/api/endpoints/users/search.ts
index a2077b589d..edc4d603ca 100644
--- a/src/server/api/endpoints/users/search.ts
+++ b/src/server/api/endpoints/users/search.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy';
 const escapeRegexp = require('escape-regexp');
-import User, { pack, ILocalUser, validateUsername, IUser } from '../../../../models/user';
-import getParams from '../../get-params';
+import User, { pack, validateUsername, IUser } from '../../../../models/user';
+import define from '../../define';
 
 export const meta = {
 	desc: {
@@ -44,13 +44,7 @@ export const meta = {
 	},
 };
 
-/**
- * Search a user
- */
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	const isUsername = validateUsername(ps.query.replace('@', ''));
 
 	let users: IUser[] = [];
@@ -158,4 +152,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 
 	// Serialize
 	res(await Promise.all(users.map(user => pack(user, me, { detail: true }))));
-});
+}));
diff --git a/src/server/api/endpoints/users/show.ts b/src/server/api/endpoints/users/show.ts
index c6f01593d4..93223b3f9f 100644
--- a/src/server/api/endpoints/users/show.ts
+++ b/src/server/api/endpoints/users/show.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID, { transform, transformMany } from '../../../../misc/cafy-id';
-import User, { pack, ILocalUser, isRemoteUser } from '../../../../models/user';
+import User, { pack, isRemoteUser } from '../../../../models/user';
 import resolveRemoteUser from '../../../../remote/resolve-user';
-import getParams from '../../get-params';
+import define from '../../define';
 
 const cursorOption = { fields: { data: false } };
 
@@ -39,10 +39,7 @@ export const meta = {
 	}
 };
 
-export default (params: any, me: ILocalUser) => new Promise(async (res, rej) => {
-	const [ps, psErr] = getParams(meta, params);
-	if (psErr) return rej(psErr);
-
+export default define(meta, (ps, me) => new Promise(async (res, rej) => {
 	let user;
 
 	if (ps.userIds) {
@@ -87,4 +84,4 @@ export default (params: any, me: ILocalUser) => new Promise(async (res, rej) =>
 			}
 		}
 	}
-});
+}));
diff --git a/src/server/api/get-params.ts b/src/server/api/get-params.ts
deleted file mode 100644
index 60d038990e..0000000000
--- a/src/server/api/get-params.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-import { IEndpointMeta } from './endpoints';
-
-export default function <T extends IEndpointMeta>(defs: T, params: any): [{
-	[P in keyof T['params']]: T['params'][P]['transform'] extends Function
-		? ReturnType<T['params'][P]['transform']>
-		: ReturnType<T['params'][P]['validator']['get']>[0];
-}, Error] {
-	const x: any = {};
-	let err: Error = null;
-	Object.entries(defs.params).some(([k, def]) => {
-		const [v, e] = def.validator.get(params[k]);
-		if (e) {
-			err = new Error(e.message);
-			err.name = 'INVALID_PARAM';
-			(err as any).param = k;
-			return true;
-		} else {
-			if (v === undefined && def.default) {
-				x[k] = def.default;
-			} else {
-				x[k] = v;
-			}
-			if (def.transform) x[k] = def.transform(x[k]);
-			return false;
-		}
-	});
-	return [x, err];
-}