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+// Copyright 2013 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview The TrustedResourceUrl type and its builders.
+ *
+ * TODO(xtof): Link to document stating type contract.
+ */
+
+goog.provide('goog.html.TrustedResourceUrl');
+
+goog.require('goog.asserts');
+goog.require('goog.i18n.bidi.Dir');
+goog.require('goog.i18n.bidi.DirectionalString');
+goog.require('goog.string.Const');
+goog.require('goog.string.TypedString');
+
+
+
+/**
+ * A URL which is under application control and from which script, CSS, and
+ * other resources that represent executable code, can be fetched.
+ *
+ * Given that the URL can only be constructed from strings under application
+ * control and is used to load resources, bugs resulting in a malformed URL
+ * should not have a security impact and are likely to be easily detectable
+ * during testing. Given the wide number of non-RFC compliant URLs in use,
+ * stricter validation could prevent some applications from being able to use
+ * this type.
+ *
+ * Instances of this type must be created via the factory method,
+ * ({@code goog.html.TrustedResourceUrl.fromConstant}), and not by invoking its
+ * constructor. The constructor intentionally takes no parameters and the type
+ * is immutable; hence only a default instance corresponding to the empty
+ * string can be obtained via constructor invocation.
+ *
+ * @see goog.html.TrustedResourceUrl#fromConstant
+ * @constructor
+ * @final
+ * @struct
+ * @implements {goog.i18n.bidi.DirectionalString}
+ * @implements {goog.string.TypedString}
+ */
+goog.html.TrustedResourceUrl = function() {
+  /**
+   * The contained value of this TrustedResourceUrl.  The field has a purposely
+   * ugly name to make (non-compiled) code that attempts to directly access this
+   * field stand out.
+   * @private {string}
+   */
+  this.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_ = '';
+
+  /**
+   * A type marker used to implement additional run-time type checking.
+   * @see goog.html.TrustedResourceUrl#unwrap
+   * @const
+   * @private
+   */
+  this.TRUSTED_RESOURCE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
+      goog.html.TrustedResourceUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.TrustedResourceUrl.prototype.implementsGoogStringTypedString = true;
+
+
+/**
+ * Returns this TrustedResourceUrl's value as a string.
+ *
+ * IMPORTANT: In code where it is security relevant that an object's type is
+ * indeed {@code TrustedResourceUrl}, use
+ * {@code goog.html.TrustedResourceUrl.unwrap} instead of this method. If in
+ * doubt, assume that it's security relevant. In particular, note that
+ * goog.html functions which return a goog.html type do not guarantee that
+ * the returned instance is of the right type. For example:
+ *
+ * <pre>
+ * var fakeSafeHtml = new String('fake');
+ * fakeSafeHtml.__proto__ = goog.html.SafeHtml.prototype;
+ * var newSafeHtml = goog.html.SafeHtml.htmlEscape(fakeSafeHtml);
+ * // newSafeHtml is just an alias for fakeSafeHtml, it's passed through by
+ * // goog.html.SafeHtml.htmlEscape() as fakeSafeHtml instanceof
+ * // goog.html.SafeHtml.
+ * </pre>
+ *
+ * @see goog.html.TrustedResourceUrl#unwrap
+ * @override
+ */
+goog.html.TrustedResourceUrl.prototype.getTypedStringValue = function() {
+  return this.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_;
+};
+
+
+/**
+ * @override
+ * @const
+ */
+goog.html.TrustedResourceUrl.prototype.implementsGoogI18nBidiDirectionalString =
+    true;
+
+
+/**
+ * Returns this URLs directionality, which is always {@code LTR}.
+ * @override
+ */
+goog.html.TrustedResourceUrl.prototype.getDirection = function() {
+  return goog.i18n.bidi.Dir.LTR;
+};
+
+
+if (goog.DEBUG) {
+  /**
+   * Returns a debug string-representation of this value.
+   *
+   * To obtain the actual string value wrapped in a TrustedResourceUrl, use
+   * {@code goog.html.TrustedResourceUrl.unwrap}.
+   *
+   * @see goog.html.TrustedResourceUrl#unwrap
+   * @override
+   */
+  goog.html.TrustedResourceUrl.prototype.toString = function() {
+    return 'TrustedResourceUrl{' +
+        this.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_ + '}';
+  };
+}
+
+
+/**
+ * Performs a runtime check that the provided object is indeed a
+ * TrustedResourceUrl object, and returns its value.
+ *
+ * @param {!goog.html.TrustedResourceUrl} trustedResourceUrl The object to
+ *     extract from.
+ * @return {string} The trustedResourceUrl object's contained string, unless
+ *     the run-time type check fails. In that case, {@code unwrap} returns an
+ *     innocuous string, or, if assertions are enabled, throws
+ *     {@code goog.asserts.AssertionError}.
+ */
+goog.html.TrustedResourceUrl.unwrap = function(trustedResourceUrl) {
+  // Perform additional Run-time type-checking to ensure that
+  // trustedResourceUrl is indeed an instance of the expected type.  This
+  // provides some additional protection against security bugs due to
+  // application code that disables type checks.
+  // Specifically, the following checks are performed:
+  // 1. The object is an instance of the expected type.
+  // 2. The object is not an instance of a subclass.
+  // 3. The object carries a type marker for the expected type. "Faking" an
+  // object requires a reference to the type marker, which has names intended
+  // to stand out in code reviews.
+  if (trustedResourceUrl instanceof goog.html.TrustedResourceUrl &&
+      trustedResourceUrl.constructor === goog.html.TrustedResourceUrl &&
+      trustedResourceUrl
+              .TRUSTED_RESOURCE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
+          goog.html.TrustedResourceUrl
+              .TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
+    return trustedResourceUrl
+        .privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_;
+  } else {
+    goog.asserts.fail('expected object of type TrustedResourceUrl, got \'' +
+        trustedResourceUrl + '\' of type ' + goog.typeOf(trustedResourceUrl));
+    return 'type_error:TrustedResourceUrl';
+  }
+};
+
+
+/**
+ * Creates a TrustedResourceUrl object from a compile-time constant string.
+ *
+ * Compile-time constant strings are inherently program-controlled and hence
+ * trusted.
+ *
+ * @param {!goog.string.Const} url A compile-time-constant string from which to
+ *     create a TrustedResourceUrl.
+ * @return {!goog.html.TrustedResourceUrl} A TrustedResourceUrl object
+ *     initialized to {@code url}.
+ */
+goog.html.TrustedResourceUrl.fromConstant = function(url) {
+  return goog.html.TrustedResourceUrl
+      .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(
+          goog.string.Const.unwrap(url));
+};
+
+
+/**
+ * Creates a TrustedResourceUrl object from a compile-time constant strings.
+ *
+ * Compile-time constant strings are inherently program-controlled and hence
+ * trusted.
+ *
+ * @param {!Array<!goog.string.Const>} parts Compile-time-constant strings from
+ *     which to create a TrustedResourceUrl.
+ * @return {!goog.html.TrustedResourceUrl} A TrustedResourceUrl object
+ *     initialized to concatenation of {@code parts}.
+ */
+goog.html.TrustedResourceUrl.fromConstants = function(parts) {
+  var unwrapped = '';
+  for (var i = 0; i < parts.length; i++) {
+    unwrapped += goog.string.Const.unwrap(parts[i]);
+  }
+  return goog.html.TrustedResourceUrl
+      .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(unwrapped);
+};
+
+
+/**
+ * Type marker for the TrustedResourceUrl type, used to implement additional
+ * run-time type checking.
+ * @const {!Object}
+ * @private
+ */
+goog.html.TrustedResourceUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
+
+
+/**
+ * Package-internal utility method to create TrustedResourceUrl instances.
+ *
+ * @param {string} url The string to initialize the TrustedResourceUrl object
+ *     with.
+ * @return {!goog.html.TrustedResourceUrl} The initialized TrustedResourceUrl
+ *     object.
+ * @package
+ */
+goog.html.TrustedResourceUrl
+    .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse = function(url) {
+  var trustedResourceUrl = new goog.html.TrustedResourceUrl();
+  trustedResourceUrl.privateDoNotAccessOrElseTrustedResourceUrlWrappedValue_ =
+      url;
+  return trustedResourceUrl;
+};