git.squeep.com Git - squeep-api-dingus/blob - lib/dingus.js

   1 /* eslint-disable security/detect-object-injection */
   2 'use strict';
   3
   4 /**
   5  * A very minimal API server framework.
   6  * Just a self-contained router and some request glue.
   7  */
   8
   9 require('./patches');
  10 const { promises: fsPromises } = require('fs');
  11 const path = require('path');
  12 const querystring = require('querystring');
  13 const common = require('./common');
  14 const ContentNegotiation = require('./content-negotiation');
  15 const Enum = require('./enum');
  16 const { DingusError, ResponseError } = require('./errors');
  17 const { extensionToMime } = require('./mime-helper');
  18 const Router = require('./router');
  19 const Template = require('./template');
  20
  21 // For logging.
  22 const _fileScope = common.fileScope(__filename);
  23
  24 const defaultOptions = {
  25   ignoreTrailingSlash: false,
  26   proxyPrefix: '',
  27   strictAccept: true,
  28   selfBaseUrl: '',
  29   staticMetadata: true,
  30   trustProxy: true,
  31   querystring,
  32 };
  33
  34 class Dingus {
  35   /**
  36    * @param {Object} logger object which implements logging methods
  37    * @param {Object} options
  38    * @param {Boolean} options.ignoreTrailingSlash
  39    * @param {string} options.proxyPrefix leading part of url path to strip
  40    * @param {Boolean} options.strictAccept whether to error on unsupported Accept type
  41    * @param {string} options.selfBaseUrl for constructing links
  42    * @param {Boolean} options.staticMetadata serve static headers with static files
  43    * @param {Boolean} options.trustProxy trust some header data to be provided by proxy
  44    * @param {Object} options.querystring alternate qs parser to use
  45    */
  46   constructor(logger = common.nullLogger, options = {}) {
  47     common.setOptions(this, defaultOptions, options);
  48
  49     this.router = new Router(options);
  50
  51     if (!this.proxyPrefix) {
  52       this._stripPrefix = (p) => p;
  53     }
  54
  55     this.responseTypes = [
  56       Enum.ContentType.TextHTML,
  57       Enum.ContentType.TextPlain,
  58       Enum.ContentType.ApplicationJson,
  59     ];
  60
  61     this.logger = logger;
  62     common.ensureLoggerLevels(this.logger);
  63   }
  64
  65
  66   /**
  67    * Resolve relative and empty paths in url
  68    * @param {string} p path
  69    */
  70   _normalizePath(p) {
  71     const pathNorm = path.normalize(p); // This isn't perfectly correct, but it's easy...
  72     return this._stripPrefix(pathNorm);
  73   }
  74
  75
  76   /**
  77    * Remove a leading portion of url path
  78    * N.B. This method gets obliterated if there is no prefix defined at construction
  79    * @param {string} p path
  80    */
  81   _stripPrefix(p) {
  82     if (p.startsWith(this.proxyPrefix)) {
  83       return p.slice(this.proxyPrefix.length);
  84     }
  85     return p;
  86   }
  87
  88
  89   /**
  90    * Returns the path part, and querystring object, from a request url.
  91    * @param {string} url
  92    */
  93   _splitUrl(url) {
  94     const [ p, qs ] = common.splitFirst(url, '?');
  95     return {
  96       pathPart: this._normalizePath(p),
  97       queryParams: this.querystring.parse(qs),
  98     };
  99   }
 100
 101
 102   /**
 103    * Insert a new path handler
 104    * @param {string} method
 105    * @param {string} urlPath
 106    * @param {fn} handler
 107    */
 108   on(method, urlPath, handler, ...handlerArgs) {
 109     this.router.on(method, urlPath, handler, handlerArgs);
 110   }
 111
 112
 113   /**
 114    * Common header tagging for all requests.
 115    * Add our own identifier, and persist any external transit identifiers.
 116    * @param {http.ClientRequest} req
 117    * @param {http.ServerResponse} res
 118    * @param {object} ctx
 119    */
 120   static tagContext(req, res, ctx) {
 121     const requestId = common.requestId();
 122     ctx.requestId = requestId;
 123     res.setHeader(Enum.Header.RequestId, requestId);
 124     [Enum.Header.XRequestId, Enum.Header.XCorrelationId].forEach((h) => {
 125       const v = req.getHeader(h);
 126       if (v) {
 127         ctx[h.replace(/-/g, '')] = v;
 128         res.setHeader(h, v);
 129       }
 130     });
 131     return requestId;
 132   }
 133
 134
 135   /**
 136    *
 137    * @param {http.ClientRequest} req
 138    */
 139   _getAddress(req) {
 140     // TODO: RFC7239 Forwarded support
 141     const address = (this.trustProxy && req && req.getHeader(Enum.Header.XForwardedFor)) ||
 142       (this.trustProxy && req && req.getHeader(Enum.Header.XRealIP)) ||
 143       (req && req.connection && req.connection.remoteAddress) ||
 144       '';
 145     return address.split(/\s*,\s*/u)[0];
 146   }
 147
 148
 149   /**
 150    *
 151    * @param {http.ClientRequest} req
 152    */
 153   _getProtocol(req) {
 154     // TODO: RFC7239 Forwarded support
 155     const protocol = (this.trustProxy && req && req.getHeader(Enum.Header.XForwardedProto)) ||
 156       ((req && req.connection && req.connection.encrypted) ? 'https' : 'http');
 157     return protocol.split(/\s*,\s*/u)[0];
 158   }
 159
 160
 161   /**
 162    *
 163    * @param {http.ClientRequest} req
 164    * @param {http.ServerResponse} res
 165    * @param {object} ctx
 166    */
 167   clientAddressContext(req, res, ctx) {
 168     ctx.clientAddress = this._getAddress(req);
 169     ctx.clientProtocol = this._getProtocol(req);
 170   }
 171
 172
 173   /**
 174    * Called before every request handler.
 175    * @param {http.ClientRequest} req
 176    * @param {http.ServerResponse} res
 177    * @param {object} ctx
 178    */
 179   async preHandler(req, res, ctx) {
 180     Dingus.tagContext(req, res, ctx);
 181     this.clientAddressContext(req, res, ctx);
 182   }
 183
 184
 185   /**
 186    * Helper for collecting chunks as array of buffers.
 187    * @param {Buffer[]} chunks
 188    * @param {string|Buffer} chunk
 189    * @param {string} encoding
 190    */
 191   static pushBufChunk(chunks, chunk, encoding = 'utf8') {
 192     if (chunk) {
 193       if (typeof chunk === 'string') {
 194         chunk = Buffer.from(chunk, encoding);
 195       }
 196       chunks.push(chunk);
 197     }
 198   }
 199
 200
 201   /**
 202    * Sets ctx.responseBody and calls handler upon res.end().
 203    * @param {http.ClientRequest} req
 204    * @param {http.ServerResponse} res
 205    * @param {object} ctx
 206    * @param {*} handler fn(req, res, ctx)
 207    */
 208   static setEndBodyHandler(req, res, ctx, handler) {
 209     const origWrite = res.write.bind(res);
 210     const origEnd = res.end.bind(res);
 211     const chunks = [];
 212     res.write = function (chunk, encoding, ...rest) {
 213       Dingus.pushBufChunk(chunks, chunk, encoding);
 214       return origWrite(chunk, encoding, ...rest);
 215     };
 216     res.end = function (data, encoding, ...rest) {
 217       Dingus.pushBufChunk(chunks, data, encoding);
 218       ctx.responseBody = Buffer.concat(chunks);
 219       handler(req, res, ctx);
 220       return origEnd(data, encoding, ...rest);
 221     };
 222   }
 223
 224
 225   /**
 226    * Intercept writes for head requests, do not send to client,
 227    * but send length, and make body available in context.
 228    * @param {http.ClientRequest} req
 229    * @param {http.ServerResponse} res
 230    * @param {object} ctx
 231    */
 232   static setHeadHandler(req, res, ctx) {
 233     if (req.method === 'HEAD') {
 234       const origEnd = res.end.bind(res);
 235       const chunks = [];
 236       res.write = function (chunk, encoding) {
 237         Dingus.pushBufChunk(chunks, chunk, encoding);
 238         // No call to original res.write.
 239       };
 240       res.end = function (data, encoding, ...rest) {
 241         Dingus.pushBufChunk(chunks, data, encoding);
 242         ctx.responseBody = Buffer.concat(chunks);
 243         res.setHeader(Enum.Header.ContentLength, Buffer.byteLength(ctx.responseBody));
 244         return origEnd(undefined, encoding, ...rest);
 245       };
 246     }
 247   }
 248
 249
 250   /**
 251    * Dispatch the handler for a request
 252    * @param {http.ClientRequest} req
 253    * @param {http.ServerResponse} res
 254    * @param {object} ctx
 255    */
 256   async dispatch(req, res, ctx = {}) {
 257     const _scope = _fileScope('dispatch');
 258
 259     const { pathPart, queryParams } = this._splitUrl(req.url);
 260     ctx.queryParams = queryParams;
 261
 262     let handler, handlerArgs = [];
 263     try {
 264       ({ handler, handlerArgs } = this.router.lookup(req.method, pathPart, ctx));
 265     } catch (e) {
 266       if (e instanceof DingusError) {
 267         switch (e.message) {
 268           case 'NoPath':
 269             handler = this.handlerNotFound.bind(this);
 270             break;
 271           case 'NoMethod':
 272             handler = this.handlerMethodNotAllowed.bind(this);
 273             break;
 274           default:
 275             this.logger.error(_scope, 'unknown dingus error', { error: e });
 276             handler = this.handlerInternalServerError.bind(this);
 277         }
 278       } else if (e instanceof URIError) {
 279         handler = this.handlerBadRequest.bind(this);
 280       } else {
 281         this.logger.error(_scope, 'lookup failure', { error: e });
 282         handler = this.handlerInternalServerError.bind(this);
 283       }
 284     }
 285
 286     try {
 287       await this.preHandler(req, res, ctx);
 288       return await handler(req, res, ctx, ...handlerArgs);
 289     } catch (e) {
 290       ctx.error = e;
 291       this.sendErrorResponse(e, req, res, ctx);
 292     }
 293   }
 294
 295
 296   /**
 297    * Return normalized type, without any parameters.
 298    * @param {http.ClientRequest} req
 299    * @returns {string}
 300    */
 301   static getRequestContentType(req) {
 302     const contentType = req.getHeader(Enum.Header.ContentType);
 303     return (contentType || '').split(';')[0].trim().toLowerCase();
 304   }
 305
 306
 307   /**
 308    * Parse rawBody from ctx as contentType into parsedBody.
 309    * @param {string} contentType
 310    * @param {object} ctx
 311    */
 312   parseBody(contentType, ctx) {
 313     const _scope = _fileScope('parseBody');
 314
 315     switch (contentType) {
 316       case Enum.ContentType.ApplicationForm:
 317         ctx.parsedBody = this.querystring.parse(ctx.rawBody);
 318         break;
 319
 320       case Enum.ContentType.ApplicationJson:
 321         try {
 322           ctx.parsedBody = JSON.parse(ctx.rawBody);
 323         } catch (e) {
 324           this.logger.debug(_scope, 'JSON parse failed', { requestId: ctx.requestId, error: e });
 325           throw new ResponseError(Enum.ErrorResponse.BadRequest, e.message);
 326         }
 327         break;
 328
 329       default:
 330         this.logger.debug(_scope, 'unhandled content-type', { requestId: ctx.requestId, contentType });
 331         throw new ResponseError(Enum.ErrorResponse.UnsupportedMediaType);
 332     }
 333   }
 334
 335
 336   /**
 337    * Return all body data from a request.
 338    * @param {http.ClientRequest} req
 339    */
 340   async bodyData(req) {
 341     const _scope = _fileScope('bodyData');
 342     return new Promise((resolve, reject) => {
 343       const body = [];
 344       req.on('data', (chunk) => body.push(chunk));
 345       req.on('end', () => resolve(Buffer.concat(body).toString()));
 346       req.on('error', (e) => {
 347         this.logger.error(_scope, 'failed', { error: e });
 348         reject(e);
 349       });
 350     });
 351   }
 352
 353
 354   /**
 355    * Read and parse request body data.
 356    * @param {http.ClientRequest} req
 357    * @param {http.ServerResponse} res
 358    * @param {object} ctx
 359    */
 360   async ingestBody(req, res, ctx) {
 361     ctx.rawBody = await this.bodyData(req);
 362     const contentType = Dingus.getRequestContentType(req);
 363     this.parseBody(contentType, ctx);
 364   }
 365
 366
 367   /**
 368    * Return the best matching response type.
 369    * @param {string[]} responseTypes
 370    * @param {http.ClientRequest} req
 371    */
 372   static getResponseContentType(responseTypes, req) {
 373     const acceptHeader = req.getHeader(Enum.Header.Accept);
 374     return ContentNegotiation.accept(responseTypes, acceptHeader);
 375   }
 376
 377
 378   /**
 379    * Returns a list of the most-preferred content encodings for the response.
 380    * @param {string[]} responseEncodings
 381    * @param {http.ClientRequest} req
 382    */
 383   static getResponseEncoding(responseEncodings, req) {
 384     const acceptEncodingHeader = req.getHeader(Enum.Header.AcceptEncoding);
 385     return ContentNegotiation.preferred(responseEncodings, acceptEncodingHeader);
 386   }
 387
 388
 389   /**
 390    * Set the best content type for the response.
 391    * @param {string[]} responseTypes default first
 392    * @param {http.ClientRequest} req
 393    * @param {http.ServerResponse} res
 394    * @param {object} ctx
 395    */
 396   setResponseType(responseTypes, req, res, ctx) {
 397     const _scope = _fileScope('setResponseType');
 398     ctx.responseType = Dingus.getResponseContentType(responseTypes, req);
 399     if (!ctx.responseType) {
 400       if (this.strictAccept) {
 401         this.logger.debug(_scope, 'unhandled strict accept', { requestId: req.requestId });
 402         throw new ResponseError(Enum.ErrorResponse.NotAcceptable);
 403       } else {
 404         ctx.responseType = responseTypes[0];
 405       }
 406     }
 407     res.setHeader(Enum.Header.ContentType, ctx.responseType);
 408   }
 409
 410
 411   /**
 412    * Inserts an encoding
 413    * @param {http.ServerResponse} res
 414    * @param {string} encoding
 415    */
 416   static addEncodingHeader(res, encoding) {
 417     const existingEncodings = res.getHeader(Enum.Header.ContentEncoding);
 418     if (existingEncodings) {
 419       encoding = `${encoding}, ${existingEncodings}`;
 420     }
 421     res.setHeader(Enum.Header.ContentEncoding, encoding);
 422   }
 423
 424
 425   /**
 426    * Attempt to fetch both data and metadata for a file.
 427    * @param {string} filePath
 428    */
 429   async _readFileInfo(filePath) {
 430     const _scope = _fileScope('_readFileInfo');
 431     let result;
 432     try {
 433       // eslint-disable-next-line security/detect-non-literal-fs-filename
 434       const stat = fsPromises.stat(filePath);
 435       // eslint-disable-next-line security/detect-non-literal-fs-filename
 436       const data = fsPromises.readFile(filePath);
 437       result = await Promise.all([stat, data]);
 438     } catch (e) {
 439       if (['ENOENT', 'EACCES', 'EISDIR', 'ENAMETOOLONG', 'EINVAL'].includes(e.code)) {
 440         return [null, null];
 441       }
 442       this.logger.error(_scope, 'fs error', { error: e, filePath });
 443       throw e;
 444     }
 445     return result;
 446   }
 447
 448
 449   /**
 450    * Potentially add additional headers from static file meta-file.
 451    * @param {http.ServerResponse} res
 452    * @param {string} directory
 453    * @param {string} fileName - already normalized and filtered
 454    */
 455   async _serveFileMetaHeaders(res, directory, fileName) {
 456     const _scope = _fileScope('_serveFileMetaHeaders');
 457     this.logger.debug(_scope, 'called', { directory, fileName });
 458
 459     const metaPrefix = '.';
 460     const metaSuffix = '.meta';
 461     const metaFileName = `${metaPrefix}${fileName}${metaSuffix}`;
 462     const metaFilePath = path.join(directory, metaFileName);
 463
 464     const [stat, data] = await this._readFileInfo(metaFilePath);
 465     if (!stat) {
 466       return;
 467     }
 468
 469     const lineBreakRE = /\r\n|\n|\r/;
 470     const lines = data.toString().split(lineBreakRE);
 471     common.unfoldHeaderLines(lines);
 472
 473     const headerParseRE = /^(?<name>[^:]+): +(?<value>.*)$/;
 474     lines.forEach((line) => {
 475       if (line) {
 476         const result = headerParseRE.exec(line);
 477         const { groups: header } = result;
 478         res.setHeader(header.name, header.value);
 479       }
 480     });
 481   }
 482
 483
 484   /**
 485    * Serve a file from a directory, with rudimentary cache awareness.
 486    * This will also serve pre-encoded variations if available and requested.
 487    * @param {http.ClientRequest} req
 488    * @param {http.ServerResponse} res
 489    * @param {object} ctx
 490    * @param {string} directory
 491    * @param {string} fileName
 492    */
 493   async serveFile(req, res, ctx, directory, fileName) {
 494     const _scope = _fileScope('serveFile');
 495     this.logger.debug(_scope, 'called', { req: common.requestLogData(req), ctx });
 496
 497     // Normalize the supplied path, as encoded path-navigation may have been (maliciously) present.
 498     fileName = path.normalize(fileName);
 499
 500     // We will not deal with any subdirs, nor any dot-files.
 501     // (Note that we could not deal with subdirs even if we wanted, due to simple router matching scheme.)
 502     if (fileName.indexOf(path.sep) >= 0
 503     ||  fileName.charAt(0) === '.') {
 504       this.logger.debug(_scope, 'rejected filename', { fileName });
 505       return this.handlerNotFound(req, res, ctx);
 506     }
 507
 508     const filePath = path.join(directory, fileName);
 509
 510     // File must exist, before any alternate static encodings will be considered.
 511     let [stat, data] = await this._readFileInfo(filePath);
 512     if (!stat) {
 513       return this.handlerNotFound(req, res, ctx);
 514     }
 515
 516     // If encodings were requested, check for static versions to serve.
 517     // Update stat and data if matching version is found.
 518     ctx.availableEncodings = Dingus.getResponseEncoding(Object.values(Enum.EncodingType), req);
 519     if (ctx.availableEncodings.length === 0) {
 520       // Identity encoding was specifically denied, and nothing else available.
 521       this.logger.debug(_scope, 'no suitable encodings', { ctx });
 522       return this.handlerMethodNotAllowed(req, res, ctx);
 523     }
 524     for (const encoding of ctx.availableEncodings) {
 525       if (encoding === Enum.EncodingType.Identity) {
 526         break;
 527       }
 528       const suffix = Enum.EncodingTypeSuffix[encoding];
 529       if (suffix) {
 530         const encodedFilePath = `${filePath}${suffix}`;
 531         const [ encodedStat, encodedData ] = await this._readFileInfo(encodedFilePath);
 532         if (encodedStat) {
 533           ([ stat, data ] = [ encodedStat, encodedData ]);
 534           ctx.selectedEncoding = encoding;
 535           Dingus.addEncodingHeader(res, encoding);
 536           res.setHeader(Enum.Header.Vary, Enum.Header.AcceptEncoding);
 537           this.logger.debug(_scope, 'serving encoded version', { ctx, encodedFilePath });
 538         }
 539         break;
 540       }
 541     }
 542
 543     const lastModifiedDate = new Date(stat.mtimeMs);
 544     res.setHeader(Enum.Header.LastModified, lastModifiedDate.toGMTString());
 545
 546     const eTag = common.generateETag(filePath, stat, data);
 547     res.setHeader(Enum.Header.ETag, eTag);
 548
 549     if (common.isClientCached(req, stat.mtimeMs, eTag)) {
 550       this.logger.debug(_scope, 'client cached file', { filePath });
 551       res.statusCode = 304; // Not Modified
 552       res.end();
 553       return;
 554     }
 555
 556     // Set the type based on extension of un-encoded filename.
 557     const ext = path.extname(filePath).slice(1); // Drop the dot
 558     const contentType = extensionToMime(ext);
 559     res.setHeader(Enum.Header.ContentType, contentType);
 560
 561     // We presume static files are relatively cacheable.
 562     res.setHeader(Enum.Header.CacheControl, 'public');
 563
 564     if (this.staticMetadata) {
 565       await this._serveFileMetaHeaders(res, directory, fileName);
 566     }
 567
 568     this.logger.debug(_scope, 'serving file', { filePath, contentType });
 569     res.end(data);
 570   }
 571
 572
 573   /**
 574    * Return a content-type appropriate rendering of an errorResponse object.
 575    * @param {string} type content-type of response
 576    * @param {object} err either an Error object, or an error response
 577    * @param {number} err.statusCode
 578    * @param {string} err.errorMessage
 579    * @param {string|string[]} err.details
 580    */
 581   // eslint-disable-next-line class-methods-use-this
 582   renderError(contentType, err) {
 583     switch (contentType) {
 584       case Enum.ContentType.ApplicationJson:
 585         return JSON.stringify(err);
 586
 587       case Enum.ContentType.TextHTML:
 588         return Template.errorHTML(err);
 589
 590       case Enum.ContentType.TextPlain:
 591       default:
 592         return [err.errorMessage, err.details].join('\r\n');
 593     }
 594   }
 595
 596
 597   /**
 598    * Send an error response.  Terminal.
 599    * Logs any non-error-response errors as such.
 600    * @param {object} err either an Error object, or an error response
 601    * @param {http.ClientRequest} req
 602    * @param {http.ServerResponse} res
 603    * @param {object} ctx
 604    */
 605   sendErrorResponse(err, req, res, ctx) {
 606     const _scope = _fileScope('sendErrorResponse');
 607     let body;
 608
 609     // Default to a content type if one is not yet present
 610     if (!res.hasHeader(Enum.Header.ContentType)) {
 611       res.setHeader(Enum.Header.ContentType, Enum.ContentType.TextPlain);
 612     }
 613
 614     if (err && err.statusCode) {
 615       res.statusCode = err.statusCode;
 616       body = this.renderError(res.getHeader(Enum.Header.ContentType), err);
 617       this.logger.debug(_scope, 'handler error', { err, ...common.handlerLogData(req, res, ctx) });
 618     } else {
 619       res.statusCode = 500;
 620       body = this.renderError(res.getHeader(Enum.Header.ContentType), Enum.ErrorResponse.InternalServerError);
 621       this.logger.error(_scope, 'handler exception', { err, ...common.handlerLogData(req, res, ctx) });
 622     }
 623     res.end(body);
 624   }
 625
 626
 627   /**
 628    * @param {http.ClientRequest} req
 629    * @param {http.ServerResponse} res
 630    * @param {object} ctx
 631    * @param {String} file - override ctx.params.file
 632    */
 633   async handlerGetStaticFile(req, res, ctx, file) {
 634     Dingus.setHeadHandler(req, res, ctx);
 635
 636     // Set a default response type to handle any errors; will be re-set to serve actual static content type.
 637     this.setResponseType(this.responseTypes, req, res, ctx);
 638
 639     await this.serveFile(req, res, ctx, this.staticPath, file || ctx.params.file);
 640   }
 641
 642
 643   /**
 644    * @param {http.ClientRequest} req
 645    * @param {http.ServerResponse} res
 646    * @param {Object} ctx
 647    * @param {String} newPath
 648    * @param {Number} statusCode
 649   */
 650   async handlerRedirect(req, res, ctx, newPath, statusCode = 307) {
 651     this.setResponseType(this.responseTypes, req, res, ctx);
 652     res.setHeader(Enum.Header.Location, newPath);
 653     res.statusCode = statusCode;
 654     res.end();
 655   }
 656
 657
 658   /**
 659    * @param {http.ClientRequest} req
 660    * @param {http.ServerResponse} res
 661    * @param {object} ctx
 662    */
 663   async handlerMethodNotAllowed(req, res, ctx) {
 664     this.setResponseType(this.responseTypes, req, res, ctx);
 665     throw new ResponseError(Enum.ErrorResponse.MethodNotAllowed);
 666   }
 667
 668
 669   /**
 670    * @param {http.ClientRequest} req
 671    * @param {http.ServerResponse} res
 672    * @param {object} ctx
 673    */
 674   async handlerNotFound(req, res, ctx) {
 675     this.setResponseType(this.responseTypes, req, res, ctx);
 676     throw new ResponseError(Enum.ErrorResponse.NotFound);
 677   }
 678
 679
 680   /**
 681    * @param {http.ClientRequest} req
 682    * @param {http.ServerResponse} res
 683    * @param {object} ctx
 684    */
 685   async handlerBadRequest(req, res, ctx) {
 686     this.setResponseType(this.responseTypes, req, res, ctx);
 687     throw new ResponseError(Enum.ErrorResponse.BadRequest);
 688   }
 689
 690
 691   /**
 692    * @param {http.ClientRequest} req
 693    * @param {http.ServerResponse} res
 694    * @param {object} ctx
 695    */
 696   async handlerInternalServerError(req, res, ctx) {
 697     this.setResponseType(this.responseTypes, req, res, ctx);
 698     throw new ResponseError(Enum.ErrorResponse.InternalServerError);
 699   }
 700
 701 }
 702
 703 module.exports = Dingus;