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/1/goog/html/safescript.js | 234 +++++++++++++++++++++++++++++++ 1 file changed, 234 insertions(+) create mode 100644 src/assets/viz/1/goog/html/safescript.js (limited to 'src/assets/viz/1/goog/html/safescript.js') diff --git a/src/assets/viz/1/goog/html/safescript.js b/src/assets/viz/1/goog/html/safescript.js new file mode 100644 index 0000000..26f58f6 --- /dev/null +++ b/src/assets/viz/1/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 + * @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(''); -- cgit v1.2.3