added a few messages that the bot would respond to

node_modules/http-errors/index.js

@@ -0,0 +1,289 @@
+/*!
+ * http-errors
+ * Copyright(c) 2014 Jonathan Ong
+ * Copyright(c) 2016 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var deprecate = require('depd')('http-errors')
+var setPrototypeOf = require('setprototypeof')
+var statuses = require('statuses')
+var inherits = require('inherits')
+var toIdentifier = require('toidentifier')
+
+/**
+ * Module exports.
+ * @public
+ */
+
+module.exports = createError
+module.exports.HttpError = createHttpErrorConstructor()
+module.exports.isHttpError = createIsHttpErrorFunction(module.exports.HttpError)
+
+// Populate exports for all constructors
+populateConstructorExports(module.exports, statuses.codes, module.exports.HttpError)
+
+/**
+ * Get the code class of a status code.
+ * @private
+ */
+
+function codeClass (status) {
+  return Number(String(status).charAt(0) + '00')
+}
+
+/**
+ * Create a new HTTP Error.
+ *
+ * @returns {Error}
+ * @public
+ */
+
+function createError () {
+  // so much arity going on ~_~
+  var err
+  var msg
+  var status = 500
+  var props = {}
+  for (var i = 0; i < arguments.length; i++) {
+    var arg = arguments[i]
+    var type = typeof arg
+    if (type === 'object' && arg instanceof Error) {
+      err = arg
+      status = err.status || err.statusCode || status
+    } else if (type === 'number' && i === 0) {
+      status = arg
+    } else if (type === 'string') {
+      msg = arg
+    } else if (type === 'object') {
+      props = arg
+    } else {
+      throw new TypeError('argument #' + (i + 1) + ' unsupported type ' + type)
+    }
+  }
+
+  if (typeof status === 'number' && (status < 400 || status >= 600)) {
+    deprecate('non-error status code; use only 4xx or 5xx status codes')
+  }
+
+  if (typeof status !== 'number' ||
+    (!statuses.message[status] && (status < 400 || status >= 600))) {
+    status = 500
+  }
+
+  // constructor
+  var HttpError = createError[status] || createError[codeClass(status)]
+
+  if (!err) {
+    // create error
+    err = HttpError
+      ? new HttpError(msg)
+      : new Error(msg || statuses.message[status])
+    Error.captureStackTrace(err, createError)
+  }
+
+  if (!HttpError || !(err instanceof HttpError) || err.status !== status) {
+    // add properties to generic error
+    err.expose = status < 500
+    err.status = err.statusCode = status
+  }
+
+  for (var key in props) {
+    if (key !== 'status' && key !== 'statusCode') {
+      err[key] = props[key]
+    }
+  }
+
+  return err
+}
+
+/**
+ * Create HTTP error abstract base class.
+ * @private
+ */
+
+function createHttpErrorConstructor () {
+  function HttpError () {
+    throw new TypeError('cannot construct abstract class')
+  }
+
+  inherits(HttpError, Error)
+
+  return HttpError
+}
+
+/**
+ * Create a constructor for a client error.
+ * @private
+ */
+
+function createClientErrorConstructor (HttpError, name, code) {
+  var className = toClassName(name)
+
+  function ClientError (message) {
+    // create the error object
+    var msg = message != null ? message : statuses.message[code]
+    var err = new Error(msg)
+
+    // capture a stack trace to the construction point
+    Error.captureStackTrace(err, ClientError)
+
+    // adjust the [[Prototype]]
+    setPrototypeOf(err, ClientError.prototype)
+
+    // redefine the error message
+    Object.defineProperty(err, 'message', {
+      enumerable: true,
+      configurable: true,
+      value: msg,
+      writable: true
+    })
+
+    // redefine the error name
+    Object.defineProperty(err, 'name', {
+      enumerable: false,
+      configurable: true,
+      value: className,
+      writable: true
+    })
+
+    return err
+  }
+
+  inherits(ClientError, HttpError)
+  nameFunc(ClientError, className)
+
+  ClientError.prototype.status = code
+  ClientError.prototype.statusCode = code
+  ClientError.prototype.expose = true
+
+  return ClientError
+}
+
+/**
+ * Create function to test is a value is a HttpError.
+ * @private
+ */
+
+function createIsHttpErrorFunction (HttpError) {
+  return function isHttpError (val) {
+    if (!val || typeof val !== 'object') {
+      return false
+    }
+
+    if (val instanceof HttpError) {
+      return true
+    }
+
+    return val instanceof Error &&
+      typeof val.expose === 'boolean' &&
+      typeof val.statusCode === 'number' && val.status === val.statusCode
+  }
+}
+
+/**
+ * Create a constructor for a server error.
+ * @private
+ */
+
+function createServerErrorConstructor (HttpError, name, code) {
+  var className = toClassName(name)
+
+  function ServerError (message) {
+    // create the error object
+    var msg = message != null ? message : statuses.message[code]
+    var err = new Error(msg)
+
+    // capture a stack trace to the construction point
+    Error.captureStackTrace(err, ServerError)
+
+    // adjust the [[Prototype]]
+    setPrototypeOf(err, ServerError.prototype)
+
+    // redefine the error message
+    Object.defineProperty(err, 'message', {
+      enumerable: true,
+      configurable: true,
+      value: msg,
+      writable: true
+    })
+
+    // redefine the error name
+    Object.defineProperty(err, 'name', {
+      enumerable: false,
+      configurable: true,
+      value: className,
+      writable: true
+    })
+
+    return err
+  }
+
+  inherits(ServerError, HttpError)
+  nameFunc(ServerError, className)
+
+  ServerError.prototype.status = code
+  ServerError.prototype.statusCode = code
+  ServerError.prototype.expose = false
+
+  return ServerError
+}
+
+/**
+ * Set the name of a function, if possible.
+ * @private
+ */
+
+function nameFunc (func, name) {
+  var desc = Object.getOwnPropertyDescriptor(func, 'name')
+
+  if (desc && desc.configurable) {
+    desc.value = name
+    Object.defineProperty(func, 'name', desc)
+  }
+}
+
+/**
+ * Populate the exports object with constructors for every error class.
+ * @private
+ */
+
+function populateConstructorExports (exports, codes, HttpError) {
+  codes.forEach(function forEachCode (code) {
+    var CodeError
+    var name = toIdentifier(statuses.message[code])
+
+    switch (codeClass(code)) {
+      case 400:
+        CodeError = createClientErrorConstructor(HttpError, name, code)
+        break
+      case 500:
+        CodeError = createServerErrorConstructor(HttpError, name, code)
+        break
+    }
+
+    if (CodeError) {
+      // export the constructor
+      exports[code] = CodeError
+      exports[name] = CodeError
+    }
+  })
+}
+
+/**
+ * Get a class name from a name identifier.
+ * @private
+ */
+
+function toClassName (name) {
+  return name.substr(-5) !== 'Error'
+    ? name + 'Error'
+    : name
+}