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[josuexyz/.git] / node_modules / content-type / index.js

diff --git a/node_modules/content-type/index.js b/node_modules/content-type/index.js
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+/*!
+ * content-type
+ * Copyright(c) 2015 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+'use strict'
+
+/**
+ * RegExp to match *( ";" parameter ) in RFC 7231 sec 3.1.1.1
+ *
+ * parameter     = token "=" ( token / quoted-string )
+ * token         = 1*tchar
+ * tchar         = "!" / "#" / "$" / "%" / "&" / "'" / "*"
+ *               / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
+ *               / DIGIT / ALPHA
+ *               ; any VCHAR, except delimiters
+ * quoted-string = DQUOTE *( qdtext / quoted-pair ) DQUOTE
+ * qdtext        = HTAB / SP / %x21 / %x23-5B / %x5D-7E / obs-text
+ * obs-text      = %x80-FF
+ * quoted-pair   = "\" ( HTAB / SP / VCHAR / obs-text )
+ */
+var PARAM_REGEXP = /; *([!#$%&'*+.^_`|~0-9A-Za-z-]+) *= *("(?:[\u000b\u0020\u0021\u0023-\u005b\u005d-\u007e\u0080-\u00ff]|\\[\u000b\u0020-\u00ff])*"|[!#$%&'*+.^_`|~0-9A-Za-z-]+) */g
+var TEXT_REGEXP = /^[\u000b\u0020-\u007e\u0080-\u00ff]+$/
+var TOKEN_REGEXP = /^[!#$%&'*+.^_`|~0-9A-Za-z-]+$/
+
+/**
+ * RegExp to match quoted-pair in RFC 7230 sec 3.2.6
+ *
+ * quoted-pair = "\" ( HTAB / SP / VCHAR / obs-text )
+ * obs-text    = %x80-FF
+ */
+var QESC_REGEXP = /\\([\u000b\u0020-\u00ff])/g
+
+/**
+ * RegExp to match chars that must be quoted-pair in RFC 7230 sec 3.2.6
+ */
+var QUOTE_REGEXP = /([\\"])/g
+
+/**
+ * RegExp to match type in RFC 7231 sec 3.1.1.1
+ *
+ * media-type = type "/" subtype
+ * type       = token
+ * subtype    = token
+ */
+var TYPE_REGEXP = /^[!#$%&'*+.^_`|~0-9A-Za-z-]+\/[!#$%&'*+.^_`|~0-9A-Za-z-]+$/
+
+/**
+ * Module exports.
+ * @public
+ */
+
+exports.format = format
+exports.parse = parse
+
+/**
+ * Format object to media type.
+ *
+ * @param {object} obj
+ * @return {string}
+ * @public
+ */
+
+function format (obj) {
+  if (!obj || typeof obj !== 'object') {
+    throw new TypeError('argument obj is required')
+  }
+
+  var parameters = obj.parameters
+  var type = obj.type
+
+  if (!type || !TYPE_REGEXP.test(type)) {
+    throw new TypeError('invalid type')
+  }
+
+  var string = type
+
+  // append parameters
+  if (parameters && typeof parameters === 'object') {
+    var param
+    var params = Object.keys(parameters).sort()
+
+    for (var i = 0; i < params.length; i++) {
+      param = params[i]
+
+      if (!TOKEN_REGEXP.test(param)) {
+        throw new TypeError('invalid parameter name')
+      }
+
+      string += '; ' + param + '=' + qstring(parameters[param])
+    }
+  }
+
+  return string
+}
+
+/**
+ * Parse media type to object.
+ *
+ * @param {string|object} string
+ * @return {Object}
+ * @public
+ */
+
+function parse (string) {
+  if (!string) {
+    throw new TypeError('argument string is required')
+  }
+
+  // support req/res-like objects as argument
+  var header = typeof string === 'object'
+    ? getcontenttype(string)
+    : string
+
+  if (typeof header !== 'string') {
+    throw new TypeError('argument string is required to be a string')
+  }
+
+  var index = header.indexOf(';')
+  var type = index !== -1
+    ? header.substr(0, index).trim()
+    : header.trim()
+
+  if (!TYPE_REGEXP.test(type)) {
+    throw new TypeError('invalid media type')
+  }
+
+  var obj = new ContentType(type.toLowerCase())
+
+  // parse parameters
+  if (index !== -1) {
+    var key
+    var match
+    var value
+
+    PARAM_REGEXP.lastIndex = index
+
+    while ((match = PARAM_REGEXP.exec(header))) {
+      if (match.index !== index) {
+        throw new TypeError('invalid parameter format')
+      }
+
+      index += match[0].length
+      key = match[1].toLowerCase()
+      value = match[2]
+
+      if (value[0] === '"') {
+        // remove quotes and escapes
+        value = value
+          .substr(1, value.length - 2)
+          .replace(QESC_REGEXP, '$1')
+      }
+
+      obj.parameters[key] = value
+    }
+
+    if (index !== header.length) {
+      throw new TypeError('invalid parameter format')
+    }
+  }
+
+  return obj
+}
+
+/**
+ * Get content-type from req/res objects.
+ *
+ * @param {object}
+ * @return {Object}
+ * @private
+ */
+
+function getcontenttype (obj) {
+  var header
+
+  if (typeof obj.getHeader === 'function') {
+    // res-like
+    header = obj.getHeader('content-type')
+  } else if (typeof obj.headers === 'object') {
+    // req-like
+    header = obj.headers && obj.headers['content-type']
+  }
+
+  if (typeof header !== 'string') {
+    throw new TypeError('content-type header is missing from object')
+  }
+
+  return header
+}
+
+/**
+ * Quote a string if necessary.
+ *
+ * @param {string} val
+ * @return {string}
+ * @private
+ */
+
+function qstring (val) {
+  var str = String(val)
+
+  // no need to quote tokens
+  if (TOKEN_REGEXP.test(str)) {
+    return str
+  }
+
+  if (str.length > 0 && !TEXT_REGEXP.test(str)) {
+    throw new TypeError('invalid parameter value')
+  }
+
+  return '"' + str.replace(QUOTE_REGEXP, '\\$1') + '"'
+}
+
+/**
+ * Class to represent a content type.
+ * @private
+ */
+function ContentType (type) {
+  this.parameters = Object.create(null)
+  this.type = type
+}