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/safestyle.js | 449 ++++++++++++++++++++++++++++++++ 1 file changed, 449 insertions(+) create mode 100644 src/assets/viz/1/goog/html/safestyle.js (limited to 'src/assets/viz/1/goog/html/safestyle.js') diff --git a/src/assets/viz/1/goog/html/safestyle.js b/src/assets/viz/1/goog/html/safestyle.js new file mode 100644 index 0000000..a1f87cb --- /dev/null +++ b/src/assets/viz/1/goog/html/safestyle.js @@ -0,0 +1,449 @@ +// 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.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. + * + * A SafeStyle's string representation ({@link #getTypedStringValue()}) can + * safely: + * + * + * A SafeStyle may never contain literal angle brackets. Otherwise, it could + * be unsafe to place a SafeStyle into a <style> tag (where it can't + * be HTML escaped). For example, if the SafeStyle containing + * "{@code font: 'foo <style/><script>evil</script>'}" were + * interpolated within a <style> tag, this would then break out of the + * style context into HTML. + * + * A SafeStyle may contain literal single or double quotes, and as such the + * entire style string must be escaped when used in a style attribute (if + * this were not the case, the string could contain a matching quote that + * would escape from the style attribute). + * + * Values of this type must be composable, i.e. for any two values + * {@code style1} and {@code style2} of this type, + * {@code goog.html.SafeStyle.unwrap(style1) + + * goog.html.SafeStyle.unwrap(style2)} must itself be a value that satisfies + * the SafeStyle type constraint. This requirement implies that for any value + * {@code style} of this type, {@code goog.html.SafeStyle.unwrap(style)} must + * not end in a "property value" or "property name" context. For example, + * a value of {@code background:url("} or {@code font-} would not satisfy the + * SafeStyle contract. This is because concatenating such strings with a + * second value that itself does not contain unsafe CSS can result in an + * overall string that does. For example, if {@code javascript:evil())"} is + * appended to {@code background:url("}, the resulting string may result in + * the execution of a malicious script. + * + * TODO(user): Consider whether we should implement UTF-8 interchange + * validity checks and blacklisting of newlines (including Unicode ones) and + * other whitespace characters (\t, \f). Document here if so and also update + * SafeStyle.fromConstant(). + * + * The following example values comply with this type's contract: + * + * In addition, the empty string is safe for use in a CSS attribute. + * + * The following example values do NOT comply with this type's contract: + * + * + * @see goog.html.SafeStyle#create + * @see goog.html.SafeStyle#fromConstant + * @see http://www.w3.org/TR/css3-syntax/ + * @constructor + * @final + * @struct + * @implements {goog.string.TypedString} + */ +goog.html.SafeStyle = function() { + /** + * The contained value of this SafeStyle. The field has a purposely + * ugly name to make (non-compiled) code that attempts to directly access this + * field stand out. + * @private {string} + */ + this.privateDoNotAccessOrElseSafeStyleWrappedValue_ = ''; + + /** + * A type marker used to implement additional run-time type checking. + * @see goog.html.SafeStyle#unwrap + * @const + * @private + */ + this.SAFE_STYLE_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = + goog.html.SafeStyle.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_; +}; + + +/** + * @override + * @const + */ +goog.html.SafeStyle.prototype.implementsGoogStringTypedString = true; + + +/** + * Type marker for the SafeStyle type, used to implement additional + * run-time type checking. + * @const {!Object} + * @private + */ +goog.html.SafeStyle.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ = {}; + + +/** + * Creates a SafeStyle object from a compile-time constant string. + * + * {@code style} should be in the format + * {@code name: value; [name: value; ...]} and must not have any < or > + * characters in it. This is so that SafeStyle's contract is preserved, + * allowing the SafeStyle to correctly be interpreted as a sequence of CSS + * declarations and without affecting the syntactic structure of any + * surrounding CSS and HTML. + * + * This method performs basic sanity checks on the format of {@code style} + * but does not constrain the format of {@code name} and {@code value}, except + * for disallowing tag characters. + * + * @param {!goog.string.Const} style A compile-time-constant string from which + * to create a SafeStyle. + * @return {!goog.html.SafeStyle} A SafeStyle object initialized to + * {@code style}. + */ +goog.html.SafeStyle.fromConstant = function(style) { + var styleString = goog.string.Const.unwrap(style); + if (styleString.length === 0) { + return goog.html.SafeStyle.EMPTY; + } + goog.html.SafeStyle.checkStyle_(styleString); + goog.asserts.assert( + goog.string.endsWith(styleString, ';'), + 'Last character of style string is not \';\': ' + styleString); + goog.asserts.assert( + goog.string.contains(styleString, ':'), + 'Style string must contain at least one \':\', to ' + + 'specify a "name: value" pair: ' + styleString); + return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse( + styleString); +}; + + +/** + * Checks if the style definition is valid. + * @param {string} style + * @private + */ +goog.html.SafeStyle.checkStyle_ = function(style) { + goog.asserts.assert( + !/[<>]/.test(style), 'Forbidden characters in style string: ' + style); +}; + + +/** + * Returns this SafeStyle's value as a string. + * + * IMPORTANT: In code where it is security relevant that an object's type is + * indeed {@code SafeStyle}, use {@code goog.html.SafeStyle.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.SafeStyle#unwrap + * @override + */ +goog.html.SafeStyle.prototype.getTypedStringValue = function() { + return this.privateDoNotAccessOrElseSafeStyleWrappedValue_; +}; + + +if (goog.DEBUG) { + /** + * Returns a debug string-representation of this value. + * + * To obtain the actual string value wrapped in a SafeStyle, use + * {@code goog.html.SafeStyle.unwrap}. + * + * @see goog.html.SafeStyle#unwrap + * @override + */ + goog.html.SafeStyle.prototype.toString = function() { + return 'SafeStyle{' + this.privateDoNotAccessOrElseSafeStyleWrappedValue_ + + '}'; + }; +} + + +/** + * Performs a runtime check that the provided object is indeed a + * SafeStyle object, and returns its value. + * + * @param {!goog.html.SafeStyle} safeStyle The object to extract from. + * @return {string} The safeStyle 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.SafeStyle.unwrap = function(safeStyle) { + // Perform additional Run-time type-checking to ensure that + // safeStyle 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 (safeStyle instanceof goog.html.SafeStyle && + safeStyle.constructor === goog.html.SafeStyle && + safeStyle.SAFE_STYLE_TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_ === + goog.html.SafeStyle.TYPE_MARKER_GOOG_HTML_SECURITY_PRIVATE_) { + return safeStyle.privateDoNotAccessOrElseSafeStyleWrappedValue_; + } else { + goog.asserts.fail('expected object of type SafeStyle, got \'' + + safeStyle + '\' of type ' + goog.typeOf(safeStyle)); + return 'type_error:SafeStyle'; + } +}; + + +/** + * Package-internal utility method to create SafeStyle instances. + * + * @param {string} style The string to initialize the SafeStyle object with. + * @return {!goog.html.SafeStyle} The initialized SafeStyle object. + * @package + */ +goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse = function( + style) { + return new goog.html.SafeStyle().initSecurityPrivateDoNotAccessOrElse_(style); +}; + + +/** + * Called from createSafeStyleSecurityPrivateDoNotAccessOrElse(). This + * method exists only so that the compiler can dead code eliminate static + * fields (like EMPTY) when they're not accessed. + * @param {string} style + * @return {!goog.html.SafeStyle} + * @private + */ +goog.html.SafeStyle.prototype.initSecurityPrivateDoNotAccessOrElse_ = function( + style) { + this.privateDoNotAccessOrElseSafeStyleWrappedValue_ = style; + return this; +}; + + +/** + * A SafeStyle instance corresponding to the empty string. + * @const {!goog.html.SafeStyle} + */ +goog.html.SafeStyle.EMPTY = + goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse(''); + + +/** + * The innocuous string generated by goog.html.SafeUrl.create when passed + * an unsafe value. + * @const {string} + */ +goog.html.SafeStyle.INNOCUOUS_STRING = 'zClosurez'; + + +/** + * Mapping of property names to their values. + * @typedef {!Object} + */ +goog.html.SafeStyle.PropertyMap; + + +/** + * Creates a new SafeStyle object from the properties specified in the map. + * @param {goog.html.SafeStyle.PropertyMap} map Mapping of property names to + * their values, for example {'margin': '1px'}. Names must consist of + * [-_a-zA-Z0-9]. Values might be strings consisting of + * [-,.'"%_!# a-zA-Z0-9], where " and ' must be properly balanced. + * Other values must be wrapped in goog.string.Const. Null value causes + * skipping the property. + * @return {!goog.html.SafeStyle} + * @throws {Error} If invalid name is provided. + * @throws {goog.asserts.AssertionError} If invalid value is provided. With + * disabled assertions, invalid value is replaced by + * goog.html.SafeStyle.INNOCUOUS_STRING. + */ +goog.html.SafeStyle.create = function(map) { + var style = ''; + for (var name in map) { + if (!/^[-_a-zA-Z0-9]+$/.test(name)) { + throw Error('Name allows only [-_a-zA-Z0-9], got: ' + name); + } + var value = map[name]; + if (value == null) { + continue; + } + if (value instanceof goog.string.Const) { + value = goog.string.Const.unwrap(value); + // These characters can be used to change context and we don't want that + // even with const values. + goog.asserts.assert(!/[{;}]/.test(value), 'Value does not allow [{;}].'); + } else if (!goog.html.SafeStyle.VALUE_RE_.test(value)) { + goog.asserts.fail( + 'String value allows only [-,."\'%_!# a-zA-Z0-9], rgb() and ' + + 'rgba(), got: ' + value); + value = goog.html.SafeStyle.INNOCUOUS_STRING; + } else if (!goog.html.SafeStyle.hasBalancedQuotes_(value)) { + goog.asserts.fail('String value requires balanced quotes, got: ' + value); + value = goog.html.SafeStyle.INNOCUOUS_STRING; + } + style += name + ':' + value + ';'; + } + if (!style) { + return goog.html.SafeStyle.EMPTY; + } + goog.html.SafeStyle.checkStyle_(style); + return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse( + style); +}; + + +/** + * Checks that quotes (" and ') are properly balanced inside a string. Assumes + * that neither escape (\) nor any other character that could result in + * breaking out of a string parsing context are allowed; + * see http://www.w3.org/TR/css3-syntax/#string-token-diagram. + * @param {string} value Untrusted CSS property value. + * @return {boolean} True if property value is safe with respect to quote + * balancedness. + * @private + */ +goog.html.SafeStyle.hasBalancedQuotes_ = function(value) { + var outsideSingle = true; + var outsideDouble = true; + for (var i = 0; i < value.length; i++) { + var c = value.charAt(i); + if (c == "'" && outsideDouble) { + outsideSingle = !outsideSingle; + } else if (c == '"' && outsideSingle) { + outsideDouble = !outsideDouble; + } + } + return outsideSingle && outsideDouble; +}; + + +// Keep in sync with the error string in create(). +/** + * Regular expression for safe values. + * + * Quotes (" and ') are allowed, but a check must be done elsewhere to ensure + * they're balanced. + * + * ',' allows multiple values to be assigned to the same property + * (e.g. background-attachment or font-family) and hence could allow + * multiple values to get injected, but that should pose no risk of XSS. + * + * The rgb() and rgba() expression checks only for XSS safety, not for CSS + * validity. + * @const {!RegExp} + * @private + */ +goog.html.SafeStyle.VALUE_RE_ = + /^([-,."'%_!# a-zA-Z0-9]+|(?:rgb|hsl)a?\([0-9.%, ]+\))$/; + + +/** + * Creates a new SafeStyle object by concatenating the values. + * @param {...(!goog.html.SafeStyle|!Array)} var_args + * SafeStyles to concatenate. + * @return {!goog.html.SafeStyle} + */ +goog.html.SafeStyle.concat = function(var_args) { + var style = ''; + + /** + * @param {!goog.html.SafeStyle|!Array} argument + */ + var addArgument = function(argument) { + if (goog.isArray(argument)) { + goog.array.forEach(argument, addArgument); + } else { + style += goog.html.SafeStyle.unwrap(argument); + } + }; + + goog.array.forEach(arguments, addArgument); + if (!style) { + return goog.html.SafeStyle.EMPTY; + } + return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse( + style); +}; -- cgit v1.2.3