1 files changed, 258 insertions, 0 deletions
diff --git a/packages/backend/src/server/api/ApiCallService.ts b/packages/backend/src/server/api/ApiCallService.ts
new file mode 100644
index 0000000000..f2ead3d4a1
--- /dev/null
+++ b/packages/backend/src/server/api/ApiCallService.ts
@@ -0,0 +1,258 @@
+import { performance } from 'perf_hooks';
+import { Inject, Injectable } from '@nestjs/common';
+import { DI } from '@/di-symbols.js';
+import { getIpHash } from '@/misc/get-ip-hash.js';
+import type { CacheableLocalUser, User } from '@/models/entities/User.js';
+import type { AccessToken } from '@/models/entities/AccessToken.js';
+import type Logger from '@/logger.js';
+import { UserIpsRepository } from '@/models/index.js';
+import { MetaService } from '@/core/MetaService.js';
+import { ApiError } from './error.js';
+import { RateLimiterService } from './RateLimiterService.js';
+import { ApiLoggerService } from './ApiLoggerService.js';
+import { AuthenticateService, AuthenticationError } from './AuthenticateService.js';
+import type { OnApplicationShutdown } from '@nestjs/common';
+import type { IEndpointMeta, IEndpoint } from './endpoints.js';
+import type Koa from 'koa';
+
+const accessDenied = {
+	message: 'Access denied.',
+	code: 'ACCESS_DENIED',
+	id: '56f35758-7dd5-468b-8439-5d6fb8ec9b8e',
+};
+
+@Injectable()
+export class ApiCallService implements OnApplicationShutdown {
+	#logger: Logger;
+	#userIpHistories: Map<User['id'], Set<string>>;
+	#userIpHistoriesClearIntervalId: NodeJS.Timer;
+
+	constructor(
+		@Inject(DI.userIpsRepository)
+		private userIpsRepository: UserIpsRepository,
+
+		private metaService: MetaService,
+		private authenticateService: AuthenticateService,
+		private rateLimiterService: RateLimiterService,
+		private apiLoggerService: ApiLoggerService,
+	) {
+		this.#logger = this.apiLoggerService.logger;
+		this.#userIpHistories = new Map<User['id'], Set<string>>();
+
+		this.#userIpHistoriesClearIntervalId = setInterval(() => {
+			this.#userIpHistories.clear();
+		}, 1000 * 60 * 60);
+	}
+
+	public handleRequest(endpoint: IEndpoint, exec: any, ctx: Koa.Context) {
+		return new Promise<void>((res) => {
+			const body = ctx.is('multipart/form-data')
+				? (ctx.request as any).body
+				: ctx.method === 'GET'
+					? ctx.query
+					: ctx.request.body;
+		
+			const reply = (x?: any, y?: ApiError) => {
+				if (x == null) {
+					ctx.status = 204;
+				} else if (typeof x === 'number' && y) {
+					ctx.status = x;
+					ctx.body = {
+						error: {
+							message: y!.message,
+							code: y!.code,
+							id: y!.id,
+							kind: y!.kind,
+							...(y!.info ? { info: y!.info } : {}),
+						},
+					};
+				} else {
+					// 文字列を返す場合は、JSON.stringify通さないとJSONと認識されない
+					ctx.body = typeof x === 'string' ? JSON.stringify(x) : x;
+				}
+				res();
+			};
+		
+			// Authentication
+			this.authenticateService.authenticate(body['i']).then(([user, app]) => {
+				// API invoking
+				this.#call(endpoint, exec, user, app, body, ctx).then((res: any) => {
+					if (ctx.method === 'GET' && endpoint.meta.cacheSec && !body['i'] && !user) {
+						ctx.set('Cache-Control', `public, max-age=${endpoint.meta.cacheSec}`);
+					}
+					reply(res);
+				}).catch((e: ApiError) => {
+					reply(e.httpStatusCode ? e.httpStatusCode : e.kind === 'client' ? 400 : 500, e);
+				});
+		
+				// Log IP
+				if (user) {
+					this.metaService.fetch().then(meta => {
+						if (!meta.enableIpLogging) return;
+						const ip = ctx.ip;
+						const ips = this.#userIpHistories.get(user.id);
+						if (ips == null || !ips.has(ip)) {
+							if (ips == null) {
+								this.#userIpHistories.set(user.id, new Set([ip]));
+							} else {
+								ips.add(ip);
+							}
+		
+							try {
+								this.userIpsRepository.createQueryBuilder().insert().values({
+									createdAt: new Date(),
+									userId: user.id,
+									ip: ip,
+								}).orIgnore(true).execute();
+							} catch {
+							}
+						}
+					});
+				}
+			}).catch(e => {
+				if (e instanceof AuthenticationError) {
+					reply(403, new ApiError({
+						message: 'Authentication failed. Please ensure your token is correct.',
+						code: 'AUTHENTICATION_FAILED',
+						id: 'b0a7f5f8-dc2f-4171-b91f-de88ad238e14',
+					}));
+				} else {
+					reply(500, new ApiError());
+				}
+			});
+		});
+	}
+
+	async #call(
+		ep: IEndpoint,
+		exec: any,
+		user: CacheableLocalUser | null | undefined,
+		token: AccessToken | null | undefined,
+		data: any,
+		ctx?: Koa.Context,
+	) {
+		const isSecure = user != null && token == null;
+		const isModerator = user != null && (user.isModerator || user.isAdmin);
+
+		if (ep.meta.secure && !isSecure) {
+			throw new ApiError(accessDenied);
+		}
+
+		if (ep.meta.limit) {
+		// koa will automatically load the `X-Forwarded-For` header if `proxy: true` is configured in the app.
+			let limitActor: string;
+			if (user) {
+				limitActor = user.id;
+			} else {
+				limitActor = getIpHash(ctx!.ip);
+			}
+
+			const limit = Object.assign({}, ep.meta.limit);
+
+			if (!limit.key) {
+				limit.key = ep.name;
+			}
+
+			// Rate limit
+			await this.rateLimiterService.limit(limit as IEndpointMeta['limit'] & { key: NonNullable<string> }, limitActor).catch(e => {
+				throw new ApiError({
+					message: 'Rate limit exceeded. Please try again later.',
+					code: 'RATE_LIMIT_EXCEEDED',
+					id: 'd5826d14-3982-4d2e-8011-b9e9f02499ef',
+					httpStatusCode: 429,
+				});
+			});
+		}
+
+		if (ep.meta.requireCredential && user == null) {
+			throw new ApiError({
+				message: 'Credential required.',
+				code: 'CREDENTIAL_REQUIRED',
+				id: '1384574d-a912-4b81-8601-c7b1c4085df1',
+				httpStatusCode: 401,
+			});
+		}
+
+		if (ep.meta.requireCredential && user!.isSuspended) {
+			throw new ApiError({
+				message: 'Your account has been suspended.',
+				code: 'YOUR_ACCOUNT_SUSPENDED',
+				id: 'a8c724b3-6e9c-4b46-b1a8-bc3ed6258370',
+				httpStatusCode: 403,
+			});
+		}
+
+		if (ep.meta.requireAdmin && !user!.isAdmin) {
+			throw new ApiError(accessDenied, { reason: 'You are not the admin.' });
+		}
+
+		if (ep.meta.requireModerator && !isModerator) {
+			throw new ApiError(accessDenied, { reason: 'You are not a moderator.' });
+		}
+
+		if (token && ep.meta.kind && !token.permission.some(p => p === ep.meta.kind)) {
+			throw new ApiError({
+				message: 'Your app does not have the necessary permissions to use this endpoint.',
+				code: 'PERMISSION_DENIED',
+				id: '1370e5b7-d4eb-4566-bb1d-7748ee6a1838',
+			});
+		}
+
+		// Cast non JSON input
+		if ((ep.meta.requireFile || ctx?.method === 'GET') && ep.params.properties) {
+			for (const k of Object.keys(ep.params.properties)) {
+				const param = ep.params.properties![k];
+				if (['boolean', 'number', 'integer'].includes(param.type ?? '') && typeof data[k] === 'string') {
+					try {
+						data[k] = JSON.parse(data[k]);
+					} catch (e) {
+						throw	new ApiError({
+							message: 'Invalid param.',
+							code: 'INVALID_PARAM',
+							id: '0b5f1631-7c1a-41a6-b399-cce335f34d85',
+						}, {
+							param: k,
+							reason: `cannot cast to ${param.type}`,
+						});
+					}
+				}
+			}
+		}
+
+		// API invoking
+		const before = performance.now();
+		return await exec(data, user, token, ctx?.file, ctx?.ip, ctx?.headers).catch((err: Error) => {
+			if (err instanceof ApiError) {
+				throw err;
+			} else {
+				this.#logger.error(`Internal error occurred in ${ep.name}: ${err.message}`, {
+					ep: ep.name,
+					ps: data,
+					e: {
+						message: err.message,
+						code: err.name,
+						stack: err.stack,
+					},
+				});
+				console.error(err);
+				throw new ApiError(null, {
+					e: {
+						message: err.message,
+						code: err.name,
+						stack: err.stack,
+					},
+				});
+			}
+		}).finally(() => {
+			const after = performance.now();
+			const time = after - before;
+			if (time > 1000) {
+				this.#logger.warn(`SLOW API CALL DETECTED: ${ep.name} (${time}ms)`);
+			}
+		});
+	}
+
+	public onApplicationShutdown(signal?: string | undefined) {
+		clearInterval(this.#userIpHistoriesClearIntervalId);
+	}
+}