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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 fromConstant}, {@code fromConstants}, {@code format} or {@code
- * formatWithParams}), 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 {!Object}
- * @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 from a format string and arguments.
- *
- * The arguments for interpolation into the format string map labels to values.
- * Values of type `goog.string.Const` are interpolated without modifcation.
- * Values of other types are cast to string and encoded with
- * encodeURIComponent.
- *
- * `%{<label>}` markers are used in the format string to indicate locations
- * to be interpolated with the valued mapped to the given label. `<label>`
- * must contain only alphanumeric and `_` characters.
- *
- * The format string must start with one of the following:
- * - `https://<origin>/`
- * - `//<origin>/`
- * - `/<pathStart>`
- * - `about:blank`
- *
- * `<origin>` must contain only alphanumeric or any of the following: `-.:[]`.
- * `<pathStart>` is any character except `/` and `\`.
- *
- * Example usage:
- *
- * var url = goog.html.TrustedResourceUrl.format(goog.string.Const.from(
- * 'https://www.google.com/search?q=%{query}), {'query': searchTerm});
- *
- * var url = goog.html.TrustedResourceUrl.format(goog.string.Const.from(
- * '//www.youtube.com/v/%{videoId}?hl=en&fs=1%{autoplay}'), {
- * 'videoId': videoId,
- * 'autoplay': opt_autoplay ?
- * goog.string.Const.EMPTY : goog.string.Const.from('&autoplay=1')
- * });
- *
- * While this function can be used to create a TrustedResourceUrl from only
- * constants, fromConstant() and fromConstants() are generally preferable for
- * that purpose.
- *
- * @param {!goog.string.Const} format The format string.
- * @param {!Object<string, (string|number|!goog.string.Const)>} args Mapping
- * of labels to values to be interpolated into the format string.
- * goog.string.Const values are interpolated without encoding.
- * @return {!goog.html.TrustedResourceUrl}
- * @throws {!Error} On an invalid format string or if a label used in the
- * the format string is not present in args.
- */
-goog.html.TrustedResourceUrl.format = function(format, args) {
- var result = goog.html.TrustedResourceUrl.format_(format, args);
- return goog.html.TrustedResourceUrl
- .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(result);
-};
-
-
-/**
- * String version of TrustedResourceUrl.format.
- * @param {!goog.string.Const} format
- * @param {!Object<string, (string|number|!goog.string.Const)>} args
- * @return {string}
- * @throws {!Error}
- * @private
- */
-goog.html.TrustedResourceUrl.format_ = function(format, args) {
- var formatStr = goog.string.Const.unwrap(format);
- if (!goog.html.TrustedResourceUrl.BASE_URL_.test(formatStr)) {
- throw new Error('Invalid TrustedResourceUrl format: ' + formatStr);
- }
- return formatStr.replace(
- goog.html.TrustedResourceUrl.FORMAT_MARKER_, function(match, id) {
- if (!Object.prototype.hasOwnProperty.call(args, id)) {
- throw new Error(
- 'Found marker, "' + id + '", in format string, "' + formatStr +
- '", but no valid label mapping found ' +
- 'in args: ' + JSON.stringify(args));
- }
- var arg = args[id];
- if (arg instanceof goog.string.Const) {
- return goog.string.Const.unwrap(arg);
- } else {
- return encodeURIComponent(String(arg));
- }
- });
-};
-
-
-/**
- * @private @const {!RegExp}
- */
-goog.html.TrustedResourceUrl.FORMAT_MARKER_ = /%{(\w+)}/g;
-
-
-/**
- * The URL must be absolute, scheme-relative or path-absolute. So it must
- * start with:
- * - https:// followed by allowed origin characters.
- * - // followed by allowed origin characters.
- * - / not followed by / or \. There will only be an absolute path.
- *
- * Based on
- * https://url.spec.whatwg.org/commit-snapshots/56b74ce7cca8883eab62e9a12666e2fac665d03d/#url-parsing
- * an initial / which is not followed by another / or \ will end up in the "path
- * state" and from there it can only go to "fragment state" and "query state".
- *
- * We don't enforce a well-formed domain name. So '.' or '1.2' are valid.
- * That's ok because the origin comes from a compile-time constant.
- *
- * A regular expression is used instead of goog.uri for several reasons:
- * - Strictness. E.g. we don't want any userinfo component and we don't
- * want '/./, nor \' in the first path component.
- * - Small trusted base. goog.uri is generic and might need to change,
- * reasoning about all the ways it can parse a URL now and in the future
- * is error-prone.
- * - Code size. We expect many calls to .format(), many of which might
- * not be using goog.uri.
- * - Simplicity. Using goog.uri would likely not result in simpler nor shorter
- * code.
- * @private @const {!RegExp}
- */
-goog.html.TrustedResourceUrl.BASE_URL_ =
- /^(?:https:)?\/\/[0-9a-z.:[\]-]+\/|^\/[^\/\\]|^about:blank(#|$)/i;
-
-
-/**
- * Formats the URL same as TrustedResourceUrl.format and then adds extra URL
- * parameters.
- *
- * Example usage:
- *
- * // Creates '//www.youtube.com/v/abc?autoplay=1' for videoId='abc' and
- * // opt_autoplay=1. Creates '//www.youtube.com/v/abc' for videoId='abc'
- * // and opt_autoplay=undefined.
- * var url = goog.html.TrustedResourceUrl.formatWithParams(
- * goog.string.Const.from('//www.youtube.com/v/%{videoId}'),
- * {'videoId': videoId},
- * {'autoplay': opt_autoplay});
- *
- * @param {!goog.string.Const} format The format string.
- * @param {!Object<string, (string|number|!goog.string.Const)>} args Mapping
- * of labels to values to be interpolated into the format string.
- * goog.string.Const values are interpolated without encoding.
- * @param {!Object<string, *>} params Parameters to add to URL. Parameters with
- * value {@code null} or {@code undefined} are skipped. Both keys and values
- * are encoded. Note that JavaScript doesn't guarantee the order of values
- * in an object which might result in non-deterministic order of the
- * parameters. However, browsers currently preserve the order.
- * @return {!goog.html.TrustedResourceUrl}
- * @throws {!Error} On an invalid format string or if a label used in the
- * the format string is not present in args.
- */
-goog.html.TrustedResourceUrl.formatWithParams = function(format, args, params) {
- var url = goog.html.TrustedResourceUrl.format_(format, args);
- var separator = /\?/.test(url) ? '&' : '?';
- for (var key in params) {
- if (params[key] == null) {
- continue;
- }
- url += separator + encodeURIComponent(key) + '=' +
- encodeURIComponent(String(params[key]));
- separator = '&';
- }
- return goog.html.TrustedResourceUrl
- .createTrustedResourceUrlSecurityPrivateDoNotAccessOrElse(url);
-};
-
-
-/**
- * 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;
-};