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import * as fs from 'fs';
import { ILocalUser } from '../../models/entities/user';
import { IEndpointMeta } from './endpoints';
import { ApiError } from './error';
import { App } from '../../models/entities/app';
import { SchemaType } from '../../misc/schema';
// TODO: defaultが設定されている場合はその型も考慮する
type Params<T extends IEndpointMeta> = {
[P in keyof T['params']]: NonNullable<T['params']>[P]['transform'] extends Function
? ReturnType<NonNullable<T['params']>[P]['transform']>
: ReturnType<NonNullable<T['params']>[P]['validator']['get']>[0];
};
export type Response = Record<string, any> | void;
type executor<T extends IEndpointMeta> =
(params: Params<T>, user: T['requireCredential'] extends true ? ILocalUser : ILocalUser | null, app: App, file?: any, cleanup?: Function) =>
Promise<T['res'] extends undefined ? Response : SchemaType<NonNullable<T['res']>>>;
export default function <T extends IEndpointMeta>(meta: T, cb: executor<T>)
: (params: any, user: T['requireCredential'] extends true ? ILocalUser : ILocalUser | null, app: App, file?: any) => Promise<any> {
return (params: any, user: T['requireCredential'] extends true ? ILocalUser : ILocalUser | null, app: App, file?: any) => {
function cleanup() {
fs.unlink(file.path, () => {});
}
if (meta.requireFile && file == null) return Promise.reject(new ApiError({
message: 'File required.',
code: 'FILE_REQUIRED',
id: '4267801e-70d1-416a-b011-4ee502885d8b',
}));
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>, ApiError | null] {
if (defs.params == null) return [params, null];
const x: any = {};
let err: ApiError | null = null;
Object.entries(defs.params).some(([k, def]) => {
const [v, e] = def.validator.get(params[k]);
if (e) {
err = new ApiError({
message: 'Invalid param.',
code: 'INVALID_PARAM',
id: '3d81ceae-475f-4600-b2a8-2bc116157532',
}, {
param: k,
reason: e.message
});
return true;
} else {
if (v === undefined && def.hasOwnProperty('default')) {
x[k] = def.default;
} else {
x[k] = v;
}
if (def.transform) x[k] = def.transform(x[k]);
return false;
}
});
return [x, err];
}
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