feat(backend): report Retry-After if client hit rate limit (#13949)

* feat(backend): report `Retry-After` if client hit rate limit

* refactor(backend): fix lint error

packages/backend/src/server/api/ApiCallService.ts

@@ -73,6 +73,16 @@ export class ApiCallService implements OnApplicationShutdown {
 				reply.header('WWW-Authenticate', `Bearer realm="Misskey", error="insufficient_scope", error_description="${err.message}"`);
 			}
 			statusCode = statusCode ?? 403;
+		} else if (err.code === 'RATE_LIMIT_EXCEEDED') {
+			const info: unknown = err.info;
+			const unixEpochInSeconds = Date.now();
+			if (typeof(info) === 'object' && info && 'resetMs' in info && typeof(info.resetMs) === 'number') {
+				const cooldownInSeconds = Math.ceil((info.resetMs - unixEpochInSeconds) / 1000);
+				// もしかするとマイナスになる可能性がなくはないのでマイナスだったら0にしておく
+				reply.header('Retry-After', Math.max(cooldownInSeconds, 0).toString(10));
+			} else {
+				this.logger.warn(`rate limit information has unexpected type ${typeof(err.info?.reset)}`);
+			}
 		} else if (!statusCode) {
 			statusCode = 500;
 		}
@@ -308,12 +318,17 @@ export class ApiCallService implements OnApplicationShutdown {
 			if (factor > 0) {
 				// Rate limit
 				await this.rateLimiterService.limit(limit as IEndpointMeta['limit'] & { key: NonNullable<string> }, limitActor, factor).catch(err => {
+					if ('info' in err) {
+						// errはLimiter.LimiterInfoであることが期待される
 						throw new ApiError({
 							message: 'Rate limit exceeded. Please try again later.',
 							code: 'RATE_LIMIT_EXCEEDED',
 							id: 'd5826d14-3982-4d2e-8011-b9e9f02499ef',
 							httpStatusCode: 429,
-					});
+						}, err.info);
+					} else {
+						throw new TypeError('information must be a rate-limiter information.');
+					}
 				});
 			}
 		}

packages/backend/src/server/api/RateLimiterService.ts

@@ -32,11 +32,13 @@ export class RateLimiterService {
 
 	@bindThis
 	public limit(limitation: IEndpointMeta['limit'] & { key: NonNullable<string> }, actor: string, factor = 1) {
-		return new Promise<void>((ok, reject) => {
-			if (this.disabled) ok();
+		{
+			if (this.disabled) {
+				return Promise.resolve();
+			}
 
 			// Short-term limit
-			const min = (): void => {
+			const min = new Promise<void>((ok, reject) => {
 				const minIntervalLimiter = new Limiter({
 					id: `${actor}:${limitation.key}:min`,
 					duration: limitation.minInterval! * factor,
@@ -46,25 +48,25 @@ export class RateLimiterService {
 
 				minIntervalLimiter.get((err, info) => {
 					if (err) {
-						return reject('ERR');
+						return reject({ code: 'ERR', info });
 					}
 
 					this.logger.debug(`${actor} ${limitation.key} min remaining: ${info.remaining}`);
 
 					if (info.remaining === 0) {
-						reject('BRIEF_REQUEST_INTERVAL');
+						return reject({ code: 'BRIEF_REQUEST_INTERVAL', info });
 					} else {
 						if (hasLongTermLimit) {
-							max();
+							return max;
 						} else {
-							ok();
+							return ok();
 						}
 					}
 				});
-			};
+			});
 
 			// Long term limit
-			const max = (): void => {
+			const max = new Promise<void>((ok, reject) => {
 				const limiter = new Limiter({
 					id: `${actor}:${limitation.key}`,
 					duration: limitation.duration! * factor,
@@ -74,18 +76,18 @@ export class RateLimiterService {
 
 				limiter.get((err, info) => {
 					if (err) {
-						return reject('ERR');
+						return reject({ code: 'ERR', info });
 					}
 
 					this.logger.debug(`${actor} ${limitation.key} max remaining: ${info.remaining}`);
 
 					if (info.remaining === 0) {
-						reject('RATE_LIMIT_EXCEEDED');
+						return reject({ code: 'RATE_LIMIT_EXCEEDED', info });
 					} else {
-						ok();
+						return ok();
 					}
 				});
-			};
+			});
 
 			const hasShortTermLimit = typeof limitation.minInterval === 'number';
 
@@ -94,12 +96,12 @@ export class RateLimiterService {
 				typeof limitation.max === 'number';
 
 			if (hasShortTermLimit) {
-				min();
+				return min;
 			} else if (hasLongTermLimit) {
-				max();
+				return max;
 			} else {
-				ok();
-			}
-		});
+				return Promise.resolve();
+			}
+		}
 	}
 }