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authorBrian Picciano <mediocregopher@gmail.com>2023-08-13 22:06:32 +0200
committerBrian Picciano <mediocregopher@gmail.com>2023-08-13 22:06:32 +0200
commitc4ec9064063f3b15aeb25feb85a3afaaa02008ba (patch)
treec7e9878f69ecc4649024c57e3164b2337ba0fdf2 /src/http/static/viz/2/goog/html/safeurl.js
parent0bc9cd83b45df0a38c2944569603d6d9cf2e9edd (diff)
Remove leftover static assets specific to individual blog posts
Diffstat (limited to 'src/http/static/viz/2/goog/html/safeurl.js')
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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 SafeUrl type and its builders.
- *
- * TODO(xtof): Link to document stating type contract.
- */
-
-goog.provide('goog.html.SafeUrl');
-
-goog.require('goog.asserts');
-goog.require('goog.fs.url');
-goog.require('goog.html.TrustedResourceUrl');
-goog.require('goog.i18n.bidi.Dir');
-goog.require('goog.i18n.bidi.DirectionalString');
-goog.require('goog.string');
-goog.require('goog.string.Const');
-goog.require('goog.string.TypedString');
-
-
-
-/**
- * A string that is safe to use in URL context in DOM APIs and HTML documents.
- *
- * A SafeUrl 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 a hyperlink URL in a browser.
- *
- * Values of this type are guaranteed to be safe to use in URL/hyperlink
- * contexts, such as assignment to URL-valued DOM properties, in the sense that
- * the use will not result in a Cross-Site-Scripting vulnerability. Similarly,
- * SafeUrls can be interpolated into the URL context of an HTML template (e.g.,
- * inside a href attribute). However, appropriate HTML-escaping must still be
- * applied.
- *
- * Note that, as documented in {@code goog.html.SafeUrl.unwrap}, this type's
- * contract does not guarantee that instances are safe to interpolate into HTML
- * without appropriate escaping.
- *
- * Note also that this type's contract does not imply any guarantees regarding
- * the resource the URL refers to. In particular, SafeUrls are <b>not</b>
- * safe to use in a context where the referred-to resource is interpreted as
- * trusted code, e.g., as the src of a script tag.
- *
- * Instances of this type must be created via the factory methods
- * ({@code goog.html.SafeUrl.fromConstant}, {@code goog.html.SafeUrl.sanitize}),
- * 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.SafeUrl#fromConstant
- * @see goog.html.SafeUrl#from
- * @see goog.html.SafeUrl#sanitize
- * @constructor
- * @final
- * @struct
- * @implements {goog.i18n.bidi.DirectionalString}
- * @implements {goog.string.TypedString}
- */
-goog.html.SafeUrl = function() {
- /**
- * The contained value of this SafeUrl. 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.SafeUrl#unwrap
- * @const {!Object}
- * @private
- */
- this.SAFE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ =
- goog.html.SafeUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_;
-};
-
-
-/**
- * The innocuous string generated by goog.html.SafeUrl.sanitize when passed
- * an unsafe URL.
- *
- * about:invalid is registered in
- * http://www.w3.org/TR/css3-values/#about-invalid.
- * http://tools.ietf.org/html/rfc6694#section-2.2.1 permits about URLs to
- * contain a fragment, which is not to be considered when determining if an
- * about URL is well-known.
- *
- * Using about:invalid seems preferable to using a fixed data URL, since
- * browsers might choose to not report CSP violations on it, as legitimate
- * CSS function calls to attr() can result in this URL being produced. It is
- * also a standard URL which matches exactly the semantics we need:
- * "The about:invalid URI references a non-existent document with a generic
- * error condition. It can be used when a URI is necessary, but the default
- * value shouldn't be resolveable as any type of document".
- *
- * @const {string}
- */
-goog.html.SafeUrl.INNOCUOUS_STRING = 'about:invalid#zClosurez';
-
-
-/**
- * @override
- * @const
- */
-goog.html.SafeUrl.prototype.implementsGoogStringTypedString = true;
-
-
-/**
- * Returns this SafeUrl's value a string.
- *
- * IMPORTANT: In code where it is security relevant that an object's type is
- * indeed {@code SafeUrl}, use {@code goog.html.SafeUrl.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>
- *
- * IMPORTANT: The guarantees of the SafeUrl type contract only extend to the
- * behavior of browsers when interpreting URLs. Values of SafeUrl objects MUST
- * be appropriately escaped before embedding in a HTML document. Note that the
- * required escaping is context-sensitive (e.g. a different escaping is
- * required for embedding a URL in a style property within a style
- * attribute, as opposed to embedding in a href attribute).
- *
- * @see goog.html.SafeUrl#unwrap
- * @override
- */
-goog.html.SafeUrl.prototype.getTypedStringValue = function() {
- return this.privateDoNotAccessOrElseSafeHtmlWrappedValue_;
-};
-
-
-/**
- * @override
- * @const
- */
-goog.html.SafeUrl.prototype.implementsGoogI18nBidiDirectionalString = true;
-
-
-/**
- * Returns this URLs directionality, which is always {@code LTR}.
- * @override
- */
-goog.html.SafeUrl.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 SafeUrl, use
- * {@code goog.html.SafeUrl.unwrap}.
- *
- * @see goog.html.SafeUrl#unwrap
- * @override
- */
- goog.html.SafeUrl.prototype.toString = function() {
- return 'SafeUrl{' + this.privateDoNotAccessOrElseSafeHtmlWrappedValue_ +
- '}';
- };
-}
-
-
-/**
- * Performs a runtime check that the provided object is indeed a SafeUrl
- * object, and returns its value.
- *
- * IMPORTANT: The guarantees of the SafeUrl type contract only extend to the
- * behavior of browsers when interpreting URLs. Values of SafeUrl objects MUST
- * be appropriately escaped before embedding in a HTML document. Note that the
- * required escaping is context-sensitive (e.g. a different escaping is
- * required for embedding a URL in a style property within a style
- * attribute, as opposed to embedding in a href attribute).
- *
- * @param {!goog.html.SafeUrl} safeUrl The object to extract from.
- * @return {string} The SafeUrl 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.SafeUrl.unwrap = function(safeUrl) {
- // Perform additional Run-time type-checking to ensure that safeUrl 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 (safeUrl instanceof goog.html.SafeUrl &&
- safeUrl.constructor === goog.html.SafeUrl &&
- safeUrl.SAFE_URL_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ ===
- goog.html.SafeUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) {
- return safeUrl.privateDoNotAccessOrElseSafeHtmlWrappedValue_;
- } else {
- goog.asserts.fail('expected object of type SafeUrl, got \'' +
- safeUrl + '\' of type ' + goog.typeOf(safeUrl));
- return 'type_error:SafeUrl';
- }
-};
-
-
-/**
- * Creates a SafeUrl 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 SafeUrl.
- * @return {!goog.html.SafeUrl} A SafeUrl object initialized to {@code url}.
- */
-goog.html.SafeUrl.fromConstant = function(url) {
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
- goog.string.Const.unwrap(url));
-};
-
-
-/**
- * A pattern that matches Blob or data types that can have SafeUrls created
- * from URL.createObjectURL(blob) or via a data: URI.
- * @const
- * @private
- */
-goog.html.SAFE_MIME_TYPE_PATTERN_ = new RegExp(
- '^(?:audio/(?:3gpp|3gpp2|aac|midi|mp4|mpeg|ogg|x-m4a|x-wav|webm)|' +
- 'image/(?:bmp|gif|jpeg|jpg|png|tiff|webp)|' +
- 'text/csv|' +
- 'video/(?:mpeg|mp4|ogg|webm))$',
- 'i');
-
-
-/**
- * Creates a SafeUrl wrapping a blob URL for the given {@code blob}.
- *
- * The blob URL is created with {@code URL.createObjectURL}. If the MIME type
- * for {@code blob} is not of a known safe audio, image or video MIME type,
- * then the SafeUrl will wrap {@link #INNOCUOUS_STRING}.
- *
- * @see http://www.w3.org/TR/FileAPI/#url
- * @param {!Blob} blob
- * @return {!goog.html.SafeUrl} The blob URL, or an innocuous string wrapped
- * as a SafeUrl.
- */
-goog.html.SafeUrl.fromBlob = function(blob) {
- var url = goog.html.SAFE_MIME_TYPE_PATTERN_.test(blob.type) ?
- goog.fs.url.createObjectUrl(blob) :
- goog.html.SafeUrl.INNOCUOUS_STRING;
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
-};
-
-
-/**
- * Matches a base-64 data URL, with the first match group being the MIME type.
- * @const
- * @private
- */
-goog.html.DATA_URL_PATTERN_ = /^data:([^;,]*);base64,[a-z0-9+\/]+=*$/i;
-
-
-/**
- * Creates a SafeUrl wrapping a data: URL, after validating it matches a
- * known-safe audio, image or video MIME type.
- *
- * @param {string} dataUrl A valid base64 data URL with one of the whitelisted
- * audio, image or video MIME types.
- * @return {!goog.html.SafeUrl} A matching safe URL, or {@link INNOCUOUS_STRING}
- * wrapped as a SafeUrl if it does not pass.
- */
-goog.html.SafeUrl.fromDataUrl = function(dataUrl) {
- // There's a slight risk here that a browser sniffs the content type if it
- // doesn't know the MIME type and executes HTML within the data: URL. For this
- // to cause XSS it would also have to execute the HTML in the same origin
- // of the page with the link. It seems unlikely that both of these will
- // happen, particularly in not really old IEs.
- var match = dataUrl.match(goog.html.DATA_URL_PATTERN_);
- var valid = match && goog.html.SAFE_MIME_TYPE_PATTERN_.test(match[1]);
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
- valid ? dataUrl : goog.html.SafeUrl.INNOCUOUS_STRING);
-};
-
-
-/**
- * Creates a SafeUrl wrapping a tel: URL.
- *
- * @param {string} telUrl A tel URL.
- * @return {!goog.html.SafeUrl} A matching safe URL, or {@link INNOCUOUS_STRING}
- * wrapped as a SafeUrl if it does not pass.
- */
-goog.html.SafeUrl.fromTelUrl = function(telUrl) {
- // There's a risk that a tel: URL could immediately place a call once
- // clicked, without requiring user confirmation. For that reason it is
- // handled in this separate function.
- if (!goog.string.caseInsensitiveStartsWith(telUrl, 'tel:')) {
- telUrl = goog.html.SafeUrl.INNOCUOUS_STRING;
- }
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
- telUrl);
-};
-
-
-/**
- * Creates a SafeUrl from TrustedResourceUrl. This is safe because
- * TrustedResourceUrl is more tightly restricted than SafeUrl.
- *
- * @param {!goog.html.TrustedResourceUrl} trustedResourceUrl
- * @return {!goog.html.SafeUrl}
- */
-goog.html.SafeUrl.fromTrustedResourceUrl = function(trustedResourceUrl) {
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
- goog.html.TrustedResourceUrl.unwrap(trustedResourceUrl));
-};
-
-
-/**
- * A pattern that recognizes a commonly useful subset of URLs that satisfy
- * the SafeUrl contract.
- *
- * This regular expression matches a subset of URLs that will not cause script
- * execution if used in URL context within a HTML document. Specifically, this
- * regular expression matches if (comment from here on and regex copied from
- * Soy's EscapingConventions):
- * (1) Either a protocol in a whitelist (http, https, mailto or ftp).
- * (2) or no protocol. A protocol must be followed by a colon. The below
- * allows that by allowing colons only after one of the characters [/?#].
- * A colon after a hash (#) must be in the fragment.
- * Otherwise, a colon after a (?) must be in a query.
- * Otherwise, a colon after a single solidus (/) must be in a path.
- * Otherwise, a colon after a double solidus (//) must be in the authority
- * (before port).
- *
- * @private
- * @const {!RegExp}
- */
-goog.html.SAFE_URL_PATTERN_ =
- /^(?:(?:https?|mailto|ftp):|[^:/?#]*(?:[/?#]|$))/i;
-
-
-/**
- * Creates a SafeUrl object from {@code url}. If {@code url} is a
- * goog.html.SafeUrl then it is simply returned. Otherwise the input string is
- * validated to match a pattern of commonly used safe URLs.
- *
- * {@code url} may be a URL with the http, https, mailto or ftp scheme,
- * or a relative URL (i.e., a URL without a scheme; specifically, a
- * scheme-relative, absolute-path-relative, or path-relative URL).
- *
- * @see http://url.spec.whatwg.org/#concept-relative-url
- * @param {string|!goog.string.TypedString} url The URL to validate.
- * @return {!goog.html.SafeUrl} The validated URL, wrapped as a SafeUrl.
- */
-goog.html.SafeUrl.sanitize = function(url) {
- if (url instanceof goog.html.SafeUrl) {
- return url;
- } else if (url.implementsGoogStringTypedString) {
- url = url.getTypedStringValue();
- } else {
- url = String(url);
- }
- if (!goog.html.SAFE_URL_PATTERN_.test(url)) {
- url = goog.html.SafeUrl.INNOCUOUS_STRING;
- }
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
-};
-
-/**
- * Creates a SafeUrl object from {@code url}. If {@code url} is a
- * goog.html.SafeUrl then it is simply returned. Otherwise the input string is
- * validated to match a pattern of commonly used safe URLs.
- *
- * {@code url} may be a URL with the http, https, mailto or ftp scheme,
- * or a relative URL (i.e., a URL without a scheme; specifically, a
- * scheme-relative, absolute-path-relative, or path-relative URL).
- *
- * This function asserts (using goog.asserts) that the URL matches this pattern.
- * If it does not, in addition to failing the assert, an innocous URL will be
- * returned.
- *
- * @see http://url.spec.whatwg.org/#concept-relative-url
- * @param {string|!goog.string.TypedString} url The URL to validate.
- * @return {!goog.html.SafeUrl} The validated URL, wrapped as a SafeUrl.
- */
-goog.html.SafeUrl.sanitizeAssertUnchanged = function(url) {
- if (url instanceof goog.html.SafeUrl) {
- return url;
- } else if (url.implementsGoogStringTypedString) {
- url = url.getTypedStringValue();
- } else {
- url = String(url);
- }
- if (!goog.asserts.assert(goog.html.SAFE_URL_PATTERN_.test(url))) {
- url = goog.html.SafeUrl.INNOCUOUS_STRING;
- }
- return goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(url);
-};
-
-
-
-/**
- * Type marker for the SafeUrl type, used to implement additional run-time
- * type checking.
- * @const {!Object}
- * @private
- */
-goog.html.SafeUrl.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {};
-
-
-/**
- * Package-internal utility method to create SafeUrl instances.
- *
- * @param {string} url The string to initialize the SafeUrl object with.
- * @return {!goog.html.SafeUrl} The initialized SafeUrl object.
- * @package
- */
-goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse = function(
- url) {
- var safeUrl = new goog.html.SafeUrl();
- safeUrl.privateDoNotAccessOrElseSafeHtmlWrappedValue_ = url;
- return safeUrl;
-};
-
-
-/**
- * A SafeUrl corresponding to the special about:blank url.
- * @const {!goog.html.SafeUrl}
- */
-goog.html.SafeUrl.ABOUT_BLANK =
- goog.html.SafeUrl.createSafeUrlSecurityPrivateDoNotAccessOrElse(
- 'about:blank');