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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;
-};