1 files changed, 247 insertions, 0 deletions
diff --git a/node_modules/router/lib/layer.js b/node_modules/router/lib/layer.js
new file mode 100644
index 0000000..6a4408f
--- /dev/null
+++ b/node_modules/router/lib/layer.js
@@ -0,0 +1,247 @@
+/*!
+ * router
+ * Copyright(c) 2013 Roman Shtylman
+ * Copyright(c) 2014-2022 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+const isPromise = require('is-promise')
+const pathRegexp = require('path-to-regexp')
+const debug = require('debug')('router:layer')
+const deprecate = require('depd')('router')
+
+/**
+ * Module variables.
+ * @private
+ */
+
+const TRAILING_SLASH_REGEXP = /\/+$/
+const MATCHING_GROUP_REGEXP = /\((?:\?<(.*?)>)?(?!\?)/g
+
+/**
+ * Expose `Layer`.
+ */
+
+module.exports = Layer
+
+function Layer (path, options, fn) {
+  if (!(this instanceof Layer)) {
+    return new Layer(path, options, fn)
+  }
+
+  debug('new %o', path)
+  const opts = options || {}
+
+  this.handle = fn
+  this.keys = []
+  this.name = fn.name || '<anonymous>'
+  this.params = undefined
+  this.path = undefined
+  this.slash = path === '/' && opts.end === false
+
+  function matcher (_path) {
+    if (_path instanceof RegExp) {
+      const keys = []
+      let name = 0
+      let m
+      // eslint-disable-next-line no-cond-assign
+      while (m = MATCHING_GROUP_REGEXP.exec(_path.source)) {
+        keys.push({
+          name: m[1] || name++,
+          offset: m.index
+        })
+      }
+
+      return function regexpMatcher (p) {
+        const match = _path.exec(p)
+        if (!match) {
+          return false
+        }
+
+        const params = {}
+        for (let i = 1; i < match.length; i++) {
+          const key = keys[i - 1]
+          const prop = key.name
+          const val = decodeParam(match[i])
+
+          if (val !== undefined) {
+            params[prop] = val
+          }
+        }
+
+        return {
+          params,
+          path: match[0]
+        }
+      }
+    }
+
+    return pathRegexp.match((opts.strict ? _path : loosen(_path)), {
+      sensitive: opts.sensitive,
+      end: opts.end,
+      trailing: !opts.strict,
+      decode: decodeParam
+    })
+  }
+  this.matchers = Array.isArray(path) ? path.map(matcher) : [matcher(path)]
+}
+
+/**
+ * Handle the error for the layer.
+ *
+ * @param {Error} error
+ * @param {Request} req
+ * @param {Response} res
+ * @param {function} next
+ * @api private
+ */
+
+Layer.prototype.handleError = function handleError (error, req, res, next) {
+  const fn = this.handle
+
+  if (fn.length !== 4) {
+    // not a standard error handler
+    return next(error)
+  }
+
+  try {
+    // invoke function
+    const ret = fn(error, req, res, next)
+
+    // wait for returned promise
+    if (isPromise(ret)) {
+      if (!(ret instanceof Promise)) {
+        deprecate('handlers that are Promise-like are deprecated, use a native Promise instead')
+      }
+
+      ret.then(null, function (error) {
+        next(error || new Error('Rejected promise'))
+      })
+    }
+  } catch (err) {
+    next(err)
+  }
+}
+
+/**
+ * Handle the request for the layer.
+ *
+ * @param {Request} req
+ * @param {Response} res
+ * @param {function} next
+ * @api private
+ */
+
+Layer.prototype.handleRequest = function handleRequest (req, res, next) {
+  const fn = this.handle
+
+  if (fn.length > 3) {
+    // not a standard request handler
+    return next()
+  }
+
+  try {
+    // invoke function
+    const ret = fn(req, res, next)
+
+    // wait for returned promise
+    if (isPromise(ret)) {
+      if (!(ret instanceof Promise)) {
+        deprecate('handlers that are Promise-like are deprecated, use a native Promise instead')
+      }
+
+      ret.then(null, function (error) {
+        next(error || new Error('Rejected promise'))
+      })
+    }
+  } catch (err) {
+    next(err)
+  }
+}
+
+/**
+ * Check if this route matches `path`, if so
+ * populate `.params`.
+ *
+ * @param {String} path
+ * @return {Boolean}
+ * @api private
+ */
+
+Layer.prototype.match = function match (path) {
+  let match
+
+  if (path != null) {
+    // fast path non-ending match for / (any path matches)
+    if (this.slash) {
+      this.params = {}
+      this.path = ''
+      return true
+    }
+
+    let i = 0
+    while (!match && i < this.matchers.length) {
+      // match the path
+      match = this.matchers[i](path)
+      i++
+    }
+  }
+
+  if (!match) {
+    this.params = undefined
+    this.path = undefined
+    return false
+  }
+
+  // store values
+  this.params = match.params
+  this.path = match.path
+  this.keys = Object.keys(match.params)
+
+  return true
+}
+
+/**
+ * Decode param value.
+ *
+ * @param {string} val
+ * @return {string}
+ * @private
+ */
+
+function decodeParam (val) {
+  if (typeof val !== 'string' || val.length === 0) {
+    return val
+  }
+
+  try {
+    return decodeURIComponent(val)
+  } catch (err) {
+    if (err instanceof URIError) {
+      err.message = 'Failed to decode param \'' + val + '\''
+      err.status = 400
+    }
+
+    throw err
+  }
+}
+
+/**
+ * Loosens the given path for path-to-regexp matching.
+ */
+function loosen (path) {
+  if (path instanceof RegExp || path === '/') {
+    return path
+  }
+
+  return Array.isArray(path)
+    ? path.map(function (p) { return loosen(p) })
+    : String(path).replace(TRAILING_SLASH_REGEXP, '')
+}