From bcf9b230be6d74c71567fd0771b31d47d8dd39c7 Mon Sep 17 00:00:00 2001 From: Brian Picciano Date: Thu, 21 Jan 2021 17:22:53 -0700 Subject: build the blog with nix --- src/assets/viz/2/goog/html/safehtml.js | 994 +++++++++++++++++++++ src/assets/viz/2/goog/html/safescript.js | 234 +++++ src/assets/viz/2/goog/html/safestyle.js | 560 ++++++++++++ src/assets/viz/2/goog/html/safestylesheet.js | 344 +++++++ src/assets/viz/2/goog/html/safeurl.js | 454 ++++++++++ src/assets/viz/2/goog/html/trustedresourceurl.js | 408 +++++++++ src/assets/viz/2/goog/html/uncheckedconversions.js | 228 +++++ 7 files changed, 3222 insertions(+) create mode 100644 src/assets/viz/2/goog/html/safehtml.js create mode 100644 src/assets/viz/2/goog/html/safescript.js create mode 100644 src/assets/viz/2/goog/html/safestyle.js create mode 100644 src/assets/viz/2/goog/html/safestylesheet.js create mode 100644 src/assets/viz/2/goog/html/safeurl.js create mode 100644 src/assets/viz/2/goog/html/trustedresourceurl.js create mode 100644 src/assets/viz/2/goog/html/uncheckedconversions.js (limited to 'src/assets/viz/2/goog/html') diff --git a/src/assets/viz/2/goog/html/safehtml.js b/src/assets/viz/2/goog/html/safehtml.js new file mode 100644 index 0000000..4bffbff --- /dev/null +++ b/src/assets/viz/2/goog/html/safehtml.js @@ -0,0 +1,994 @@ +// 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 SafeHtml type and its builders. + * + * TODO(xtof): Link to document stating type contract. + */ + +goog.provide('goog.html.SafeHtml'); + +goog.require('goog.array'); +goog.require('goog.asserts'); +goog.require('goog.dom.TagName'); +goog.require('goog.dom.tags'); +goog.require('goog.html.SafeScript'); +goog.require('goog.html.SafeStyle'); +goog.require('goog.html.SafeStyleSheet'); +goog.require('goog.html.SafeUrl'); +goog.require('goog.html.TrustedResourceUrl'); +goog.require('goog.i18n.bidi.Dir'); +goog.require('goog.i18n.bidi.DirectionalString'); +goog.require('goog.labs.userAgent.browser'); +goog.require('goog.object'); +goog.require('goog.string'); +goog.require('goog.string.Const'); +goog.require('goog.string.TypedString'); + + + +/** + * A string that is safe to use in HTML context in DOM APIs and HTML documents. + * + * A SafeHtml is a string-like object that carries the security type contract + * that its value as a string will not cause untrusted script execution when + * evaluated as HTML in a browser. + * + * Values of this type are guaranteed to be safe to use in HTML contexts, + * such as, assignment to the innerHTML DOM property, or interpolation into + * a HTML template in HTML PC_DATA context, in the sense that the use will not + * result in a Cross-Site-Scripting vulnerability. + * + * Instances of this type must be created via the factory methods + * ({@code goog.html.SafeHtml.create}, {@code goog.html.SafeHtml.htmlEscape}), + * etc 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.SafeHtml#create + * @see goog.html.SafeHtml#htmlEscape + * @constructor + * @final + * @struct + * @implements {goog.i18n.bidi.DirectionalString} + * @implements {goog.string.TypedString} + */ +goog.html.SafeHtml = function() { + /** + * The contained value of this SafeHtml. The field has a purposely ugly + * name to make (non-compiled) code that attempts to directly access this + * field stand out. + * @private {string} + */ + this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = ''; + + /** + * A type marker used to implement additional run-time type checking. + * @see goog.html.SafeHtml#unwrap + * @const {!Object} + * @private + */ + this.SAFE_HTML_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = + goog.html.SafeHtml.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_; + + /** + * This SafeHtml's directionality, or null if unknown. + * @private {?goog.i18n.bidi.Dir} + */ + this.dir_ = null; +}; + + +/** + * @override + * @const + */ +goog.html.SafeHtml.prototype.implementsGoogI18nBidiDirectionalString = true; + + +/** @override */ +goog.html.SafeHtml.prototype.getDirection = function() { + return this.dir_; +}; + + +/** + * @override + * @const + */ +goog.html.SafeHtml.prototype.implementsGoogStringTypedString = true; + + +/** + * Returns this SafeHtml's value as string. + * + * IMPORTANT: In code where it is security relevant that an object's type is + * indeed {@code SafeHtml}, use {@code goog.html.SafeHtml.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: + * + * 
+ * 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.
+ *
+ * + * @see goog.html.SafeHtml#unwrap + * @override + */ +goog.html.SafeHtml.prototype.getTypedStringValue = function() { + return this.privateDoNotAccessOrElseSafeHtmlWrappedValue_; +}; + + +if (goog.DEBUG) { + /** + * Returns a debug string-representation of this value. + * + * To obtain the actual string value wrapped in a SafeHtml, use + * {@code goog.html.SafeHtml.unwrap}. + * + * @see goog.html.SafeHtml#unwrap + * @override + */ + goog.html.SafeHtml.prototype.toString = function() { + return 'SafeHtml{' + this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ + + '}'; + }; +} + + +/** + * Performs a runtime check that the provided object is indeed a SafeHtml + * object, and returns its value. + * @param {!goog.html.SafeHtml} safeHtml The object to extract from. + * @return {string} The SafeHtml 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.SafeHtml.unwrap = function(safeHtml) { + // Perform additional run-time type-checking to ensure that safeHtml 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 (safeHtml instanceof goog.html.SafeHtml && + safeHtml.constructor === goog.html.SafeHtml && + safeHtml.SAFE_HTML_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ === + goog.html.SafeHtml.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) { + return safeHtml.privateDoNotAccessOrElseSafeHtmlWrappedValue_; + } else { + goog.asserts.fail('expected object of type SafeHtml, got \'' + + safeHtml + '\' of type ' + goog.typeOf(safeHtml)); + return 'type_error:SafeHtml'; + } +}; + + +/** + * Shorthand for union of types that can sensibly be converted to strings + * or might already be SafeHtml (as SafeHtml is a goog.string.TypedString). + * @private + * @typedef {string|number|boolean|!goog.string.TypedString| + * !goog.i18n.bidi.DirectionalString} + */ +goog.html.SafeHtml.TextOrHtml_; + + +/** + * Returns HTML-escaped text as a SafeHtml object. + * + * If text is of a type that implements + * {@code goog.i18n.bidi.DirectionalString}, the directionality of the new + * {@code SafeHtml} object is set to {@code text}'s directionality, if known. + * Otherwise, the directionality of the resulting SafeHtml is unknown (i.e., + * {@code null}). + * + * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text to escape. If + * the parameter is of type SafeHtml it is returned directly (no escaping + * is done). + * @return {!goog.html.SafeHtml} The escaped text, wrapped as a SafeHtml. + */ +goog.html.SafeHtml.htmlEscape = function(textOrHtml) { + if (textOrHtml instanceof goog.html.SafeHtml) { + return textOrHtml; + } + var dir = null; + if (textOrHtml.implementsGoogI18nBidiDirectionalString) { + dir = textOrHtml.getDirection(); + } + var textAsString; + if (textOrHtml.implementsGoogStringTypedString) { + textAsString = textOrHtml.getTypedStringValue(); + } else { + textAsString = String(textOrHtml); + } + return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + goog.string.htmlEscape(textAsString), dir); +}; + + +/** + * Returns HTML-escaped text as a SafeHtml object, with newlines changed to + * <br>. + * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text to escape. If + * the parameter is of type SafeHtml it is returned directly (no escaping + * is done). + * @return {!goog.html.SafeHtml} The escaped text, wrapped as a SafeHtml. + */ +goog.html.SafeHtml.htmlEscapePreservingNewlines = function(textOrHtml) { + if (textOrHtml instanceof goog.html.SafeHtml) { + return textOrHtml; + } + var html = goog.html.SafeHtml.htmlEscape(textOrHtml); + return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + goog.string.newLineToBr(goog.html.SafeHtml.unwrap(html)), + html.getDirection()); +}; + + +/** + * Returns HTML-escaped text as a SafeHtml object, with newlines changed to + * <br> and escaping whitespace to preserve spatial formatting. Character + * entity #160 is used to make it safer for XML. + * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text to escape. If + * the parameter is of type SafeHtml it is returned directly (no escaping + * is done). + * @return {!goog.html.SafeHtml} The escaped text, wrapped as a SafeHtml. + */ +goog.html.SafeHtml.htmlEscapePreservingNewlinesAndSpaces = function( + textOrHtml) { + if (textOrHtml instanceof goog.html.SafeHtml) { + return textOrHtml; + } + var html = goog.html.SafeHtml.htmlEscape(textOrHtml); + return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + goog.string.whitespaceEscape(goog.html.SafeHtml.unwrap(html)), + html.getDirection()); +}; + + +/** + * Coerces an arbitrary object into a SafeHtml object. + * + * If {@code textOrHtml} is already of type {@code goog.html.SafeHtml}, the same + * object is returned. Otherwise, {@code textOrHtml} is coerced to string, and + * HTML-escaped. If {@code textOrHtml} is of a type that implements + * {@code goog.i18n.bidi.DirectionalString}, its directionality, if known, is + * preserved. + * + * @param {!goog.html.SafeHtml.TextOrHtml_} textOrHtml The text or SafeHtml to + * coerce. + * @return {!goog.html.SafeHtml} The resulting SafeHtml object. + * @deprecated Use goog.html.SafeHtml.htmlEscape. + */ +goog.html.SafeHtml.from = goog.html.SafeHtml.htmlEscape; + + +/** + * @const + * @private + */ +goog.html.SafeHtml.VALID_NAMES_IN_TAG_ = /^[a-zA-Z0-9-]+$/; + + +/** + * Set of attributes containing URL as defined at + * http://www.w3.org/TR/html5/index.html#attributes-1. + * @private @const {!Object} + */ +goog.html.SafeHtml.URL_ATTRIBUTES_ = goog.object.createSet( + 'action', 'cite', 'data', 'formaction', 'href', 'manifest', 'poster', + 'src'); + + +/** + * Tags which are unsupported via create(). They might be supported via a + * tag-specific create method. These are tags which might require a + * TrustedResourceUrl in one of their attributes or a restricted type for + * their content. + * @private @const {!Object} + */ +goog.html.SafeHtml.NOT_ALLOWED_TAG_NAMES_ = goog.object.createSet( + goog.dom.TagName.APPLET, goog.dom.TagName.BASE, goog.dom.TagName.EMBED, + goog.dom.TagName.IFRAME, goog.dom.TagName.LINK, goog.dom.TagName.MATH, + goog.dom.TagName.META, goog.dom.TagName.OBJECT, goog.dom.TagName.SCRIPT, + goog.dom.TagName.STYLE, goog.dom.TagName.SVG, goog.dom.TagName.TEMPLATE); + + +/** + * @typedef {string|number|goog.string.TypedString| + * goog.html.SafeStyle.PropertyMap|undefined} + */ +goog.html.SafeHtml.AttributeValue; + + +/** + * Creates a SafeHtml content consisting of a tag with optional attributes and + * optional content. + * + * For convenience tag names and attribute names are accepted as regular + * strings, instead of goog.string.Const. Nevertheless, you should not pass + * user-controlled values to these parameters. Note that these parameters are + * syntactically validated at runtime, and invalid values will result in + * an exception. + * + * Example usage: + * + * goog.html.SafeHtml.create('br'); + * goog.html.SafeHtml.create('div', {'class': 'a'}); + * goog.html.SafeHtml.create('p', {}, 'a'); + * goog.html.SafeHtml.create('p', {}, goog.html.SafeHtml.create('br')); + * + * goog.html.SafeHtml.create('span', { + * 'style': {'margin': '0'} + * }); + * + * To guarantee SafeHtml's type contract is upheld there are restrictions on + * attribute values and tag names. + * + * - For attributes which contain script code (on*), a goog.string.Const is + * required. + * - For attributes which contain style (style), a goog.html.SafeStyle or a + * goog.html.SafeStyle.PropertyMap is required. + * - For attributes which are interpreted as URLs (e.g. src, href) a + * goog.html.SafeUrl, goog.string.Const or string is required. If a string + * is passed, it will be sanitized with SafeUrl.sanitize(). + * - For tags which can load code or set security relevant page metadata, + * more specific goog.html.SafeHtml.create*() functions must be used. Tags + * which are not supported by this function are applet, base, embed, iframe, + * link, math, object, script, style, svg, and template. + * + * @param {!goog.dom.TagName|string} tagName The name of the tag. Only tag names + * consisting of [a-zA-Z0-9-] are allowed. Tag names documented above are + * disallowed. + * @param {?Object=} opt_attributes + * Mapping from attribute names to their values. Only attribute names + * consisting of [a-zA-Z0-9-] are allowed. Value of null or undefined causes + * the attribute to be omitted. + * @param {!goog.html.SafeHtml.TextOrHtml_| + * !Array=} opt_content Content to + * HTML-escape and put inside the tag. This must be empty for void tags + * like
. Array elements are concatenated. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + * @throws {Error} If invalid tag name, attribute name, or attribute value is + * provided. + * @throws {goog.asserts.AssertionError} If content for void tag is provided. + */ +goog.html.SafeHtml.create = function(tagName, opt_attributes, opt_content) { + goog.html.SafeHtml.verifyTagName(String(tagName)); + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + String(tagName), opt_attributes, opt_content); +}; + + +/** + * Verifies if the tag name is valid and if it doesn't change the context. + * E.g. STRONG is fine but SCRIPT throws because it changes context. See + * goog.html.SafeHtml.create for an explanation of allowed tags. + * @param {string} tagName + * @throws {Error} If invalid tag name is provided. + * @package + */ +goog.html.SafeHtml.verifyTagName = function(tagName) { + if (!goog.html.SafeHtml.VALID_NAMES_IN_TAG_.test(tagName)) { + throw Error('Invalid tag name <' + tagName + '>.'); + } + if (tagName.toUpperCase() in goog.html.SafeHtml.NOT_ALLOWED_TAG_NAMES_) { + throw Error('Tag name <' + tagName + '> is not allowed for SafeHtml.'); + } +}; + + +/** + * Creates a SafeHtml representing an iframe tag. + * + * This by default restricts the iframe as much as possible by setting the + * sandbox attribute to the empty string. If the iframe requires less + * restrictions, set the sandbox attribute as tight as possible, but do not rely + * on the sandbox as a security feature because it is not supported by older + * browsers. If a sandbox is essential to security (e.g. for third-party + * frames), use createSandboxIframe which checks for browser support. + * + * @see https://developer.mozilla.org/en/docs/Web/HTML/Element/iframe#attr-sandbox + * + * @param {?goog.html.TrustedResourceUrl=} opt_src The value of the src + * attribute. If null or undefined src will not be set. + * @param {?goog.html.SafeHtml=} opt_srcdoc The value of the srcdoc attribute. + * If null or undefined srcdoc will not be set. + * @param {?Object=} opt_attributes + * Mapping from attribute names to their values. Only attribute names + * consisting of [a-zA-Z0-9-] are allowed. Value of null or undefined causes + * the attribute to be omitted. + * @param {!goog.html.SafeHtml.TextOrHtml_| + * !Array=} opt_content Content to + * HTML-escape and put inside the tag. Array elements are concatenated. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + * @throws {Error} If invalid tag name, attribute name, or attribute value is + * provided. If opt_attributes contains the src or srcdoc attributes. + */ +goog.html.SafeHtml.createIframe = function( + opt_src, opt_srcdoc, opt_attributes, opt_content) { + if (opt_src) { + // Check whether this is really TrustedResourceUrl. + goog.html.TrustedResourceUrl.unwrap(opt_src); + } + + var fixedAttributes = {}; + fixedAttributes['src'] = opt_src || null; + fixedAttributes['srcdoc'] = + opt_srcdoc && goog.html.SafeHtml.unwrap(opt_srcdoc); + var defaultAttributes = {'sandbox': ''}; + var attributes = goog.html.SafeHtml.combineAttributes( + fixedAttributes, defaultAttributes, opt_attributes); + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + 'iframe', attributes, opt_content); +}; + + +/** + * Creates a SafeHtml representing a sandboxed iframe tag. + * + * The sandbox attribute is enforced in its most restrictive mode, an empty + * string. Consequently, the security requirements for the src and srcdoc + * attributes are relaxed compared to SafeHtml.createIframe. This function + * will throw on browsers that do not support the sandbox attribute, as + * determined by SafeHtml.canUseSandboxIframe. + * + * The SafeHtml returned by this function can trigger downloads with no + * user interaction on Chrome (though only a few, further attempts are blocked). + * Firefox and IE will block all downloads from the sandbox. + * + * @see https://developer.mozilla.org/en/docs/Web/HTML/Element/iframe#attr-sandbox + * @see https://lists.w3.org/Archives/Public/public-whatwg-archive/2013Feb/0112.html + * + * @param {string|!goog.html.SafeUrl=} opt_src The value of the src + * attribute. If null or undefined src will not be set. + * @param {string=} opt_srcdoc The value of the srcdoc attribute. + * If null or undefined srcdoc will not be set. Will not be sanitized. + * @param {!Object=} opt_attributes + * Mapping from attribute names to their values. Only attribute names + * consisting of [a-zA-Z0-9-] are allowed. Value of null or undefined causes + * the attribute to be omitted. + * @param {!goog.html.SafeHtml.TextOrHtml_| + * !Array=} opt_content Content to + * HTML-escape and put inside the tag. Array elements are concatenated. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + * @throws {Error} If invalid tag name, attribute name, or attribute value is + * provided. If opt_attributes contains the src, srcdoc or sandbox + * attributes. If browser does not support the sandbox attribute on iframe. + */ +goog.html.SafeHtml.createSandboxIframe = function( + opt_src, opt_srcdoc, opt_attributes, opt_content) { + if (!goog.html.SafeHtml.canUseSandboxIframe()) { + throw new Error('The browser does not support sandboxed iframes.'); + } + + var fixedAttributes = {}; + if (opt_src) { + // Note that sanitize is a no-op on SafeUrl. + fixedAttributes['src'] = + goog.html.SafeUrl.unwrap(goog.html.SafeUrl.sanitize(opt_src)); + } else { + fixedAttributes['src'] = null; + } + fixedAttributes['srcdoc'] = opt_srcdoc || null; + fixedAttributes['sandbox'] = ''; + var attributes = + goog.html.SafeHtml.combineAttributes(fixedAttributes, {}, opt_attributes); + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + 'iframe', attributes, opt_content); +}; + + +/** + * Checks if the user agent supports sandboxed iframes. + * @return {boolean} + */ +goog.html.SafeHtml.canUseSandboxIframe = function() { + return goog.global['HTMLIFrameElement'] && + ('sandbox' in goog.global['HTMLIFrameElement'].prototype); +}; + + +/** + * Creates a SafeHtml representing a script tag with the src attribute. + * @param {!goog.html.TrustedResourceUrl} src The value of the src + * attribute. + * @param {?Object=} + * opt_attributes + * Mapping from attribute names to their values. Only attribute names + * consisting of [a-zA-Z0-9-] are allowed. Value of null or undefined + * causes the attribute to be omitted. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + * @throws {Error} If invalid attribute name or value is provided. If + * opt_attributes contains the src attribute. + */ +goog.html.SafeHtml.createScriptSrc = function(src, opt_attributes) { + // TODO(mlourenco): The charset attribute should probably be blocked. If + // its value is attacker controlled, the script contains attacker controlled + // sub-strings (even if properly escaped) and the server does not set charset + // then XSS is likely possible. + // https://html.spec.whatwg.org/multipage/scripting.html#dom-script-charset + + // Check whether this is really TrustedResourceUrl. + goog.html.TrustedResourceUrl.unwrap(src); + + var fixedAttributes = {'src': src}; + var defaultAttributes = {}; + var attributes = goog.html.SafeHtml.combineAttributes( + fixedAttributes, defaultAttributes, opt_attributes); + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + 'script', attributes); +}; + + +/** + * Creates a SafeHtml representing a script tag. Does not allow the language, + * src, text or type attributes to be set. + * @param {!goog.html.SafeScript|!Array} + * script Content to put inside the tag. Array elements are + * concatenated. + * @param {?Object=} opt_attributes + * Mapping from attribute names to their values. Only attribute names + * consisting of [a-zA-Z0-9-] are allowed. Value of null or undefined causes + * the attribute to be omitted. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + * @throws {Error} If invalid attribute name or attribute value is provided. If + * opt_attributes contains the language, src, text or type attribute. + */ +goog.html.SafeHtml.createScript = function(script, opt_attributes) { + for (var attr in opt_attributes) { + var attrLower = attr.toLowerCase(); + if (attrLower == 'language' || attrLower == 'src' || attrLower == 'text' || + attrLower == 'type') { + throw Error('Cannot set "' + attrLower + '" attribute'); + } + } + + var content = ''; + script = goog.array.concat(script); + for (var i = 0; i < script.length; i++) { + content += goog.html.SafeScript.unwrap(script[i]); + } + // Convert to SafeHtml so that it's not HTML-escaped. This is safe because + // as part of its contract, SafeScript should have no dangerous '<'. + var htmlContent = + goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + content, goog.i18n.bidi.Dir.NEUTRAL); + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + 'script', opt_attributes, htmlContent); +}; + + +/** + * Creates a SafeHtml representing a style tag. The type attribute is set + * to "text/css". + * @param {!goog.html.SafeStyleSheet|!Array} + * styleSheet Content to put inside the tag. Array elements are + * concatenated. + * @param {?Object=} opt_attributes + * Mapping from attribute names to their values. Only attribute names + * consisting of [a-zA-Z0-9-] are allowed. Value of null or undefined causes + * the attribute to be omitted. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + * @throws {Error} If invalid attribute name or attribute value is provided. If + * opt_attributes contains the type attribute. + */ +goog.html.SafeHtml.createStyle = function(styleSheet, opt_attributes) { + var fixedAttributes = {'type': 'text/css'}; + var defaultAttributes = {}; + var attributes = goog.html.SafeHtml.combineAttributes( + fixedAttributes, defaultAttributes, opt_attributes); + + var content = ''; + styleSheet = goog.array.concat(styleSheet); + for (var i = 0; i < styleSheet.length; i++) { + content += goog.html.SafeStyleSheet.unwrap(styleSheet[i]); + } + // Convert to SafeHtml so that it's not HTML-escaped. This is safe because + // as part of its contract, SafeStyleSheet should have no dangerous '<'. + var htmlContent = + goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + content, goog.i18n.bidi.Dir.NEUTRAL); + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + 'style', attributes, htmlContent); +}; + + +/** + * Creates a SafeHtml representing a meta refresh tag. + * @param {!goog.html.SafeUrl|string} url Where to redirect. If a string is + * passed, it will be sanitized with SafeUrl.sanitize(). + * @param {number=} opt_secs Number of seconds until the page should be + * reloaded. Will be set to 0 if unspecified. + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + */ +goog.html.SafeHtml.createMetaRefresh = function(url, opt_secs) { + + // Note that sanitize is a no-op on SafeUrl. + var unwrappedUrl = goog.html.SafeUrl.unwrap(goog.html.SafeUrl.sanitize(url)); + + if (goog.labs.userAgent.browser.isIE() || + goog.labs.userAgent.browser.isEdge()) { + // IE/EDGE can't parse the content attribute if the url contains a + // semicolon. We can fix this by adding quotes around the url, but then we + // can't parse quotes in the URL correctly. Also, it seems that IE/EDGE + // did not unescape semicolons in these URLs at some point in the past. We + // take a best-effort approach. + // + // If the URL has semicolons (which may happen in some cases, see + // http://www.w3.org/TR/1999/REC-html401-19991224/appendix/notes.html#h-B.2 + // for instance), wrap it in single quotes to protect the semicolons. + // If the URL has semicolons and single quotes, url-encode the single quotes + // as well. + // + // This is imperfect. Notice that both ' and ; are reserved characters in + // URIs, so this could do the wrong thing, but at least it will do the wrong + // thing in only rare cases. + if (goog.string.contains(unwrappedUrl, ';')) { + unwrappedUrl = "'" + unwrappedUrl.replace(/'/g, '%27') + "'"; + } + } + var attributes = { + 'http-equiv': 'refresh', + 'content': (opt_secs || 0) + '; url=' + unwrappedUrl + }; + + // This function will handle the HTML escaping for attributes. + return goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse( + 'meta', attributes); +}; + + +/** + * @param {string} tagName The tag name. + * @param {string} name The attribute name. + * @param {!goog.html.SafeHtml.AttributeValue} value The attribute value. + * @return {string} A "name=value" string. + * @throws {Error} If attribute value is unsafe for the given tag and attribute. + * @private + */ +goog.html.SafeHtml.getAttrNameAndValue_ = function(tagName, name, value) { + // If it's goog.string.Const, allow any valid attribute name. + if (value instanceof goog.string.Const) { + value = goog.string.Const.unwrap(value); + } else if (name.toLowerCase() == 'style') { + value = goog.html.SafeHtml.getStyleValue_(value); + } else if (/^on/i.test(name)) { + // TODO(jakubvrana): Disallow more attributes with a special meaning. + throw Error( + 'Attribute "' + name + '" requires goog.string.Const value, "' + value + + '" given.'); + // URL attributes handled differently according to tag. + } else if (name.toLowerCase() in goog.html.SafeHtml.URL_ATTRIBUTES_) { + if (value instanceof goog.html.TrustedResourceUrl) { + value = goog.html.TrustedResourceUrl.unwrap(value); + } else if (value instanceof goog.html.SafeUrl) { + value = goog.html.SafeUrl.unwrap(value); + } else if (goog.isString(value)) { + value = goog.html.SafeUrl.sanitize(value).getTypedStringValue(); + } else { + throw Error( + 'Attribute "' + name + '" on tag "' + tagName + + '" requires goog.html.SafeUrl, goog.string.Const, or string,' + + ' value "' + value + '" given.'); + } + } + + // Accept SafeUrl, TrustedResourceUrl, etc. for attributes which only require + // HTML-escaping. + if (value.implementsGoogStringTypedString) { + // Ok to call getTypedStringValue() since there's no reliance on the type + // contract for security here. + value = value.getTypedStringValue(); + } + + goog.asserts.assert( + goog.isString(value) || goog.isNumber(value), + 'String or number value expected, got ' + (typeof value) + + ' with value: ' + value); + return name + '="' + goog.string.htmlEscape(String(value)) + '"'; +}; + + +/** + * Gets value allowed in "style" attribute. + * @param {!goog.html.SafeHtml.AttributeValue} value It could be SafeStyle or a + * map which will be passed to goog.html.SafeStyle.create. + * @return {string} Unwrapped value. + * @throws {Error} If string value is given. + * @private + */ +goog.html.SafeHtml.getStyleValue_ = function(value) { + if (!goog.isObject(value)) { + throw Error( + 'The "style" attribute requires goog.html.SafeStyle or map ' + + 'of style properties, ' + (typeof value) + ' given: ' + value); + } + if (!(value instanceof goog.html.SafeStyle)) { + // Process the property bag into a style object. + value = goog.html.SafeStyle.create(value); + } + return goog.html.SafeStyle.unwrap(value); +}; + + +/** + * Creates a SafeHtml content with known directionality consisting of a tag with + * optional attributes and optional content. + * @param {!goog.i18n.bidi.Dir} dir Directionality. + * @param {string} tagName + * @param {?Object=} opt_attributes + * @param {!goog.html.SafeHtml.TextOrHtml_| + * !Array=} opt_content + * @return {!goog.html.SafeHtml} The SafeHtml content with the tag. + */ +goog.html.SafeHtml.createWithDir = function( + dir, tagName, opt_attributes, opt_content) { + var html = goog.html.SafeHtml.create(tagName, opt_attributes, opt_content); + html.dir_ = dir; + return html; +}; + + +/** + * Creates a new SafeHtml object by concatenating values. + * @param {...(!goog.html.SafeHtml.TextOrHtml_| + * !Array)} var_args Values to concatenate. + * @return {!goog.html.SafeHtml} + */ +goog.html.SafeHtml.concat = function(var_args) { + var dir = goog.i18n.bidi.Dir.NEUTRAL; + var content = ''; + + /** + * @param {!goog.html.SafeHtml.TextOrHtml_| + * !Array} argument + */ + var addArgument = function(argument) { + if (goog.isArray(argument)) { + goog.array.forEach(argument, addArgument); + } else { + var html = goog.html.SafeHtml.htmlEscape(argument); + content += goog.html.SafeHtml.unwrap(html); + var htmlDir = html.getDirection(); + if (dir == goog.i18n.bidi.Dir.NEUTRAL) { + dir = htmlDir; + } else if (htmlDir != goog.i18n.bidi.Dir.NEUTRAL && dir != htmlDir) { + dir = null; + } + } + }; + + goog.array.forEach(arguments, addArgument); + return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + content, dir); +}; + + +/** + * Creates a new SafeHtml object with known directionality by concatenating the + * values. + * @param {!goog.i18n.bidi.Dir} dir Directionality. + * @param {...(!goog.html.SafeHtml.TextOrHtml_| + * !Array)} var_args Elements of array + * arguments would be processed recursively. + * @return {!goog.html.SafeHtml} + */ +goog.html.SafeHtml.concatWithDir = function(dir, var_args) { + var html = goog.html.SafeHtml.concat(goog.array.slice(arguments, 1)); + html.dir_ = dir; + return html; +}; + + +/** + * Type marker for the SafeHtml type, used to implement additional run-time + * type checking. + * @const {!Object} + * @private + */ +goog.html.SafeHtml.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {}; + + +/** + * Package-internal utility method to create SafeHtml instances. + * + * @param {string} html The string to initialize the SafeHtml object with. + * @param {?goog.i18n.bidi.Dir} dir The directionality of the SafeHtml to be + * constructed, or null if unknown. + * @return {!goog.html.SafeHtml} The initialized SafeHtml object. + * @package + */ +goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse = function( + html, dir) { + return new goog.html.SafeHtml().initSecurityPrivateDoNotAccessOrElse_( + html, dir); +}; + + +/** + * Called from createSafeHtmlSecurityPrivateDoNotAccessOrElse(). This + * method exists only so that the compiler can dead code eliminate static + * fields (like EMPTY) when they're not accessed. + * @param {string} html + * @param {?goog.i18n.bidi.Dir} dir + * @return {!goog.html.SafeHtml} + * @private + */ +goog.html.SafeHtml.prototype.initSecurityPrivateDoNotAccessOrElse_ = function( + html, dir) { + this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = html; + this.dir_ = dir; + return this; +}; + + +/** + * Like create() but does not restrict which tags can be constructed. + * + * @param {string} tagName Tag name. Set or validated by caller. + * @param {?Object=} opt_attributes + * @param {(!goog.html.SafeHtml.TextOrHtml_| + * !Array)=} opt_content + * @return {!goog.html.SafeHtml} + * @throws {Error} If invalid or unsafe attribute name or value is provided. + * @throws {goog.asserts.AssertionError} If content for void tag is provided. + * @package + */ +goog.html.SafeHtml.createSafeHtmlTagSecurityPrivateDoNotAccessOrElse = function( + tagName, opt_attributes, opt_content) { + var dir = null; + var result = '<' + tagName; + result += goog.html.SafeHtml.stringifyAttributes(tagName, opt_attributes); + + var content = opt_content; + if (!goog.isDefAndNotNull(content)) { + content = []; + } else if (!goog.isArray(content)) { + content = [content]; + } + + if (goog.dom.tags.isVoidTag(tagName.toLowerCase())) { + goog.asserts.assert( + !content.length, 'Void tag <' + tagName + '> does not allow content.'); + result += '>'; + } else { + var html = goog.html.SafeHtml.concat(content); + result += '>' + goog.html.SafeHtml.unwrap(html) + ''; + dir = html.getDirection(); + } + + var dirAttribute = opt_attributes && opt_attributes['dir']; + if (dirAttribute) { + if (/^(ltr|rtl|auto)$/i.test(dirAttribute)) { + // If the tag has the "dir" attribute specified then its direction is + // neutral because it can be safely used in any context. + dir = goog.i18n.bidi.Dir.NEUTRAL; + } else { + dir = null; + } + } + + return goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + result, dir); +}; + + +/** + * Creates a string with attributes to insert after tagName. + * @param {string} tagName + * @param {?Object=} opt_attributes + * @return {string} Returns an empty string if there are no attributes, returns + * a string starting with a space otherwise. + * @throws {Error} If attribute value is unsafe for the given tag and attribute. + * @package + */ +goog.html.SafeHtml.stringifyAttributes = function(tagName, opt_attributes) { + var result = ''; + if (opt_attributes) { + for (var name in opt_attributes) { + if (!goog.html.SafeHtml.VALID_NAMES_IN_TAG_.test(name)) { + throw Error('Invalid attribute name "' + name + '".'); + } + var value = opt_attributes[name]; + if (!goog.isDefAndNotNull(value)) { + continue; + } + result += + ' ' + goog.html.SafeHtml.getAttrNameAndValue_(tagName, name, value); + } + } + return result; +}; + + +/** + * @param {!Object} fixedAttributes + * @param {!Object} defaultAttributes + * @param {?Object=} opt_attributes + * Optional attributes passed to create*(). + * @return {!Object} + * @throws {Error} If opt_attributes contains an attribute with the same name + * as an attribute in fixedAttributes. + * @package + */ +goog.html.SafeHtml.combineAttributes = function( + fixedAttributes, defaultAttributes, opt_attributes) { + var combinedAttributes = {}; + var name; + + for (name in fixedAttributes) { + goog.asserts.assert(name.toLowerCase() == name, 'Must be lower case'); + combinedAttributes[name] = fixedAttributes[name]; + } + for (name in defaultAttributes) { + goog.asserts.assert(name.toLowerCase() == name, 'Must be lower case'); + combinedAttributes[name] = defaultAttributes[name]; + } + + for (name in opt_attributes) { + var nameLower = name.toLowerCase(); + if (nameLower in fixedAttributes) { + throw Error( + 'Cannot override "' + nameLower + '" attribute, got "' + name + + '" with value "' + opt_attributes[name] + '"'); + } + if (nameLower in defaultAttributes) { + delete combinedAttributes[nameLower]; + } + combinedAttributes[name] = opt_attributes[name]; + } + + return combinedAttributes; +}; + + +/** + * A SafeHtml instance corresponding to the HTML doctype: "". + * @const {!goog.html.SafeHtml} + */ +goog.html.SafeHtml.DOCTYPE_HTML = + goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + '', goog.i18n.bidi.Dir.NEUTRAL); + + +/** + * A SafeHtml instance corresponding to the empty string. + * @const {!goog.html.SafeHtml} + */ +goog.html.SafeHtml.EMPTY = + goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + '', goog.i18n.bidi.Dir.NEUTRAL); + + +/** + * A SafeHtml instance corresponding to the
tag. + * @const {!goog.html.SafeHtml} + */ +goog.html.SafeHtml.BR = + goog.html.SafeHtml.createSafeHtmlSecurityPrivateDoNotAccessOrElse( + '
', goog.i18n.bidi.Dir.NEUTRAL); diff --git a/src/assets/viz/2/goog/html/safescript.js b/src/assets/viz/2/goog/html/safescript.js new file mode 100644 index 0000000..7a945eb --- /dev/null +++ b/src/assets/viz/2/goog/html/safescript.js @@ -0,0 +1,234 @@ +// Copyright 2014 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 SafeScript type and its builders. + * + * TODO(xtof): Link to document stating type contract. + */ + +goog.provide('goog.html.SafeScript'); + +goog.require('goog.asserts'); +goog.require('goog.string.Const'); +goog.require('goog.string.TypedString'); + + + +/** + * A string-like object which represents JavaScript code and that carries the + * security type contract that its value, as a string, will not cause execution + * of unconstrained attacker controlled code (XSS) when evaluated as JavaScript + * in a browser. + * + * Instances of this type must be created via the factory method + * {@code goog.html.SafeScript.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. + * + * A SafeScript's string representation can safely be interpolated as the + * content of a script element within HTML. The SafeScript string should not be + * escaped before interpolation. + * + * Note that the SafeScript might contain text that is attacker-controlled but + * that text should have been interpolated with appropriate escaping, + * sanitization and/or validation into the right location in the script, such + * that it is highly constrained in its effect (for example, it had to match a + * set of whitelisted words). + * + * A SafeScript can be constructed via security-reviewed unchecked + * conversions. In this case producers of SafeScript must ensure themselves that + * the SafeScript does not contain unsafe script. Note in particular that + * {@code <} is dangerous, even when inside JavaScript strings, and so should + * always be forbidden or JavaScript escaped in user controlled input. For + * example, if {@code </script><script>evil</script>"} were + * interpolated inside a JavaScript string, it would break out of the context + * of the original script element and {@code evil} would execute. Also note + * that within an HTML script (raw text) element, HTML character references, + * such as "<" are not allowed. See + * http://www.w3.org/TR/html5/scripting-1.html#restrictions-for-contents-of-script-elements. + * + * @see goog.html.SafeScript#fromConstant + * @constructor + * @final + * @struct + * @implements {goog.string.TypedString} + */ +goog.html.SafeScript = function() { + /** + * The contained value of this SafeScript. The field has a purposely + * ugly name to make (non-compiled) code that attempts to directly access this + * field stand out. + * @private {string} + */ + this.privateDoNotAccessOrElseSafeScriptWrappedValue_ = ''; + + /** + * A type marker used to implement additional run-time type checking. + * @see goog.html.SafeScript#unwrap + * @const {!Object} + * @private + */ + this.SAFE_SCRIPT_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = + goog.html.SafeScript.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_; +}; + + +/** + * @override + * @const + */ +goog.html.SafeScript.prototype.implementsGoogStringTypedString = true; + + +/** + * Type marker for the SafeScript type, used to implement additional + * run-time type checking. + * @const {!Object} + * @private + */ +goog.html.SafeScript.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {}; + + +/** + * Creates a SafeScript object from a compile-time constant string. + * + * @param {!goog.string.Const} script A compile-time-constant string from which + * to create a SafeScript. + * @return {!goog.html.SafeScript} A SafeScript object initialized to + * {@code script}. + */ +goog.html.SafeScript.fromConstant = function(script) { + var scriptString = goog.string.Const.unwrap(script); + if (scriptString.length === 0) { + return goog.html.SafeScript.EMPTY; + } + return goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse( + scriptString); +}; + + +/** + * Returns this SafeScript's value as a string. + * + * IMPORTANT: In code where it is security relevant that an object's type is + * indeed {@code SafeScript}, use {@code goog.html.SafeScript.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 + * the returned instance is of the right type. For example: + * + * 
+ * 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.
+ *
+ * + * @see goog.html.SafeScript#unwrap + * @override + */ +goog.html.SafeScript.prototype.getTypedStringValue = function() { + return this.privateDoNotAccessOrElseSafeScriptWrappedValue_; +}; + + +if (goog.DEBUG) { + /** + * Returns a debug string-representation of this value. + * + * To obtain the actual string value wrapped in a SafeScript, use + * {@code goog.html.SafeScript.unwrap}. + * + * @see goog.html.SafeScript#unwrap + * @override + */ + goog.html.SafeScript.prototype.toString = function() { + return 'SafeScript{' + + this.privateDoNotAccessOrElseSafeScriptWrappedValue_ + '}'; + }; +} + + +/** + * Performs a runtime check that the provided object is indeed a + * SafeScript object, and returns its value. + * + * @param {!goog.html.SafeScript} safeScript The object to extract from. + * @return {string} The safeScript 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.SafeScript.unwrap = function(safeScript) { + // Perform additional Run-time type-checking to ensure that + // safeScript 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 (safeScript instanceof goog.html.SafeScript && + safeScript.constructor === goog.html.SafeScript && + safeScript.SAFE_SCRIPT_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ === + goog.html.SafeScript.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) { + return safeScript.privateDoNotAccessOrElseSafeScriptWrappedValue_; + } else { + goog.asserts.fail('expected object of type SafeScript, got \'' + + safeScript + '\' of type ' + goog.typeOf(safeScript)); + return 'type_error:SafeScript'; + } +}; + + +/** + * Package-internal utility method to create SafeScript instances. + * + * @param {string} script The string to initialize the SafeScript object with. + * @return {!goog.html.SafeScript} The initialized SafeScript object. + * @package + */ +goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse = + function(script) { + return new goog.html.SafeScript().initSecurityPrivateDoNotAccessOrElse_( + script); +}; + + +/** + * Called from createSafeScriptSecurityPrivateDoNotAccessOrElse(). This + * method exists only so that the compiler can dead code eliminate static + * fields (like EMPTY) when they're not accessed. + * @param {string} script + * @return {!goog.html.SafeScript} + * @private + */ +goog.html.SafeScript.prototype.initSecurityPrivateDoNotAccessOrElse_ = function( + script) { + this.privateDoNotAccessOrElseSafeScriptWrappedValue_ = script; + return this; +}; + + +/** + * A SafeScript instance corresponding to the empty string. + * @const {!goog.html.SafeScript} + */ +goog.html.SafeScript.EMPTY = + goog.html.SafeScript.createSafeScriptSecurityPrivateDoNotAccessOrElse(''); diff --git a/src/assets/viz/2/goog/html/safestyle.js b/src/assets/viz/2/goog/html/safestyle.js new file mode 100644 index 0000000..506a475 --- /dev/null +++ b/src/assets/viz/2/goog/html/safestyle.js @@ -0,0 +1,560 @@ +// Copyright 2014 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 SafeStyle type and its builders. + * + * TODO(xtof): Link to document stating type contract. + */ + +goog.provide('goog.html.SafeStyle'); + +goog.require('goog.array'); +goog.require('goog.asserts'); +goog.require('goog.html.SafeUrl'); +goog.require('goog.string'); +goog.require('goog.string.Const'); +goog.require('goog.string.TypedString'); + + + +/** + * A string-like object which represents a sequence of CSS declarations + * ({@code propertyName1: propertyvalue1; propertyName2: propertyValue2; ...}) + * and that carries the security type contract that its value, as a string, + * will not cause untrusted script execution (XSS) when evaluated as CSS in a + * browser. + * + * Instances of this type must be created via the factory methods + * ({@code goog.html.SafeStyle.create} or + * {@code goog.html.SafeStyle.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. + * + * SafeStyle's string representation can safely be: + *
    + *
  • Interpolated as the content of a *quoted* HTML style attribute. + * However, the SafeStyle string *must be HTML-attribute-escaped* before + * interpolation. + *
  • Interpolated as the content of a {}-wrapped block within a stylesheet. + * '<' characters in the SafeStyle string *must be CSS-escaped* before + * interpolation. The SafeStyle string is also guaranteed not to be able + * to introduce new properties or elide existing ones. + *
  • Interpolated as the content of a {}-wrapped block within an HTML + *