Initial commit for OpenECOMP SDN-C OA&M

[sdnc/oam.git] / dgbuilder / dgeflows / node_modules / body-parser / node_modules / type-is / index.js

diff --git a/dgbuilder/dgeflows/node_modules/body-parser/node_modules/type-is/index.js b/dgbuilder/dgeflows/node_modules/body-parser/node_modules/type-is/index.js
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+
+var typer = require('media-typer')
+var mime = require('mime-types')
+
+module.exports = typeofrequest;
+typeofrequest.is = typeis;
+typeofrequest.hasBody = hasbody;
+typeofrequest.normalize = normalize;
+typeofrequest.match = mimeMatch;
+
+/**
+ * Compare a `value` content-type with `types`.
+ * Each `type` can be an extension like `html`,
+ * a special shortcut like `multipart` or `urlencoded`,
+ * or a mime type.
+ *
+ * If no types match, `false` is returned.
+ * Otherwise, the first `type` that matches is returned.
+ *
+ * @param {String} value
+ * @param {Array} types
+ * @return String
+ */
+
+function typeis(value, types_) {
+  var i
+  var types = types_
+
+  // remove parameters and normalize
+  var val = typenormalize(value)
+
+  // no type or invalid
+  if (!val) {
+    return false
+  }
+
+  // support flattened arguments
+  if (types && !Array.isArray(types)) {
+    types = new Array(arguments.length - 1)
+    for (i = 0; i < types.length; i++) {
+      types[i] = arguments[i + 1]
+    }
+  }
+
+  // no types, return the content type
+  if (!types || !types.length) {
+    return val
+  }
+
+  var type
+  for (i = 0; i < types.length; i++) {
+    if (mimeMatch(normalize(type = types[i]), val)) {
+      return type[0] === '+' || ~type.indexOf('*')
+        ? val
+        : type
+    }
+  }
+
+  // no matches
+  return false;
+}
+
+/**
+ * Check if a request has a request body.
+ * A request with a body __must__ either have `transfer-encoding`
+ * or `content-length` headers set.
+ * http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.3
+ *
+ * @param {Object} request
+ * @return {Boolean}
+ * @api public
+ */
+
+function hasbody(req) {
+  var headers = req.headers;
+  if ('transfer-encoding' in headers) return true;
+  return !isNaN(headers['content-length']);
+}
+
+/**
+ * Check if the incoming request contains the "Content-Type"
+ * header field, and it contains any of the give mime `type`s.
+ * If there is no request body, `null` is returned.
+ * If there is no content type, `false` is returned.
+ * Otherwise, it returns the first `type` that matches.
+ *
+ * Examples:
+ *
+ *     // With Content-Type: text/html; charset=utf-8
+ *     this.is('html'); // => 'html'
+ *     this.is('text/html'); // => 'text/html'
+ *     this.is('text/*', 'application/json'); // => 'text/html'
+ *
+ *     // When Content-Type is application/json
+ *     this.is('json', 'urlencoded'); // => 'json'
+ *     this.is('application/json'); // => 'application/json'
+ *     this.is('html', 'application/*'); // => 'application/json'
+ *
+ *     this.is('html'); // => false
+ *
+ * @param {String|Array} types...
+ * @return {String|false|null}
+ * @api public
+ */
+
+function typeofrequest(req, types_) {
+  var types = types_
+
+  // no body
+  if (!hasbody(req)) {
+    return null
+  }
+
+  // support flattened arguments
+  if (arguments.length > 2) {
+    types = new Array(arguments.length - 1)
+    for (var i = 0; i < types.length; i++) {
+      types[i] = arguments[i + 1]
+    }
+  }
+
+  // request content type
+  var value = req.headers['content-type']
+
+  return typeis(value, types);
+}
+
+/**
+ * Normalize a mime type.
+ * If it's a shorthand, expand it to a valid mime type.
+ *
+ * In general, you probably want:
+ *
+ *   var type = is(req, ['urlencoded', 'json', 'multipart']);
+ *
+ * Then use the appropriate body parsers.
+ * These three are the most common request body types
+ * and are thus ensured to work.
+ *
+ * @param {String} type
+ * @api private
+ */
+
+function normalize(type) {
+  switch (type) {
+    case 'urlencoded': return 'application/x-www-form-urlencoded';
+    case 'multipart':
+      type = 'multipart/*';
+      break;
+  }
+
+  return type[0] === '+' || ~type.indexOf('/')
+    ? type
+    : mime.lookup(type)
+}
+
+/**
+ * Check if `exected` mime type
+ * matches `actual` mime type with
+ * wildcard and +suffix support.
+ *
+ * @param {String} expected
+ * @param {String} actual
+ * @return {Boolean}
+ * @api private
+ */
+
+function mimeMatch(expected, actual) {
+  // invalid type
+  if (expected === false) {
+    return false
+  }
+
+  // exact match
+  if (expected === actual) {
+    return true
+  }
+
+  actual = actual.split('/');
+
+  if (expected[0] === '+') {
+    // support +suffix
+    return Boolean(actual[1])
+      && expected.length <= actual[1].length
+      && expected === actual[1].substr(0 - expected.length)
+  }
+
+  if (!~expected.indexOf('*')) return false;
+
+  expected = expected.split('/');
+
+  if (expected[0] === '*') {
+    // support */yyy
+    return expected[1] === actual[1]
+  }
+
+  if (expected[1] === '*') {
+    // support xxx/*
+    return expected[0] === actual[0]
+  }
+
+  if (expected[1][0] === '*' && expected[1][1] === '+') {
+    // support xxx/*+zzz
+    return expected[0] === actual[0]
+      && expected[1].length <= actual[1].length + 1
+      && expected[1].substr(1) === actual[1].substr(1 - expected[1].length)
+  }
+
+  return false
+}
+
+/**
+ * Normalize a type and remove parameters.
+ *
+ * @param {string} value
+ * @return {string}
+ * @api private
+ */
+
+function typenormalize(value) {
+  try {
+    var type = typer.parse(value)
+    delete type.parameters
+    return typer.format(type)
+  } catch (err) {
+    return null
+  }
+}