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Diffstat (limited to 'src/assets/viz/2/goog/html/safestyle.js')
| -rw-r--r-- | src/assets/viz/2/goog/html/safestyle.js | 560 |
1 files changed, 0 insertions, 560 deletions
diff --git a/src/assets/viz/2/goog/html/safestyle.js b/src/assets/viz/2/goog/html/safestyle.js deleted file mode 100644 index 506a475..0000000 --- a/src/assets/viz/2/goog/html/safestyle.js +++ /dev/null @@ -1,560 +0,0 @@ -// 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: - * <ul> - * <li>Interpolated as the content of a *quoted* HTML style attribute. - * However, the SafeStyle string *must be HTML-attribute-escaped* before - * interpolation. - * <li>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. - * <li>Interpolated as the content of a {}-wrapped block within an HTML - * <style> element. '<' characters in the SafeStyle string - * *must be CSS-escaped* before interpolation. - * <li>Assigned to the style property of a DOM node. The SafeStyle string - * should not be escaped before being assigned to the property. - * </ul> - * - * 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(mlourenco): 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: - * <ul> - * <li><pre>width: 1em;</pre> - * <li><pre>height:1em;</pre> - * <li><pre>width: 1em;height: 1em;</pre> - * <li><pre>background:url('http://url');</pre> - * </ul> - * 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: - * <ul> - * <li><pre>background: red</pre> (missing a trailing semi-colon) - * <li><pre>background:</pre> (missing a value and a trailing semi-colon) - * <li><pre>1em</pre> (missing an attribute name, which provides context for - * the value) - * </ul> - * - * @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 {!Object} - * @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: - * - * <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.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.SafeStyle.create when passed - * an unsafe value. - * @const {string} - */ -goog.html.SafeStyle.INNOCUOUS_STRING = 'zClosurez'; - - -/** - * A single property value. - * @typedef {string|!goog.string.Const|!goog.html.SafeUrl} - */ -goog.html.SafeStyle.PropertyValue; - - -/** - * Mapping of property names to their values. - * We don't support numbers even though some values might be numbers (e.g. - * line-height or 0 for any length). The reason is that most numeric values need - * units (e.g. '1px') and allowing numbers could cause users forgetting about - * them. - * @typedef {!Object<string, ?goog.html.SafeStyle.PropertyValue| - * ?Array<!goog.html.SafeStyle.PropertyValue>>} - */ -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. We also - * allow simple functions like rgb() and url() which sanitizes its contents. - * Other values must be wrapped in goog.string.Const. URLs might be passed - * as goog.html.SafeUrl which will be wrapped into url(""). We also support - * array whose elements are joined with ' '. 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]+$/.test(name)) { - throw Error('Name allows only [-_a-zA-Z0-9], got: ' + name); - } - var value = map[name]; - if (value == null) { - continue; - } - if (goog.isArray(value)) { - value = goog.array.map(value, goog.html.SafeStyle.sanitizePropertyValue_) - .join(' '); - } else { - value = goog.html.SafeStyle.sanitizePropertyValue_(value); - } - style += name + ':' + value + ';'; - } - if (!style) { - return goog.html.SafeStyle.EMPTY; - } - goog.html.SafeStyle.checkStyle_(style); - return goog.html.SafeStyle.createSafeStyleSecurityPrivateDoNotAccessOrElse( - style); -}; - - -/** - * Checks and converts value to string. - * @param {!goog.html.SafeStyle.PropertyValue} value - * @return {string} - * @private - */ -goog.html.SafeStyle.sanitizePropertyValue_ = function(value) { - if (value instanceof goog.html.SafeUrl) { - var url = goog.html.SafeUrl.unwrap(value); - return 'url("' + url.replace(/</g, '%3c').replace(/[\\"]/g, '\\$&') + '")'; - } - var result = value instanceof goog.string.Const ? - goog.string.Const.unwrap(value) : - goog.html.SafeStyle.sanitizePropertyValueString_(String(value)); - // These characters can be used to change context and we don't want that even - // with const values. - goog.asserts.assert(!/[{;}]/.test(result), 'Value does not allow [{;}].'); - return result; -}; - - -/** - * Checks string value. - * @param {string} value - * @return {string} - * @private - */ -goog.html.SafeStyle.sanitizePropertyValueString_ = function(value) { - var valueWithoutFunctions = - value.replace(goog.html.SafeUrl.FUNCTIONS_RE_, '$1') - .replace(goog.html.SafeUrl.URL_RE_, 'url'); - if (!goog.html.SafeStyle.VALUE_RE_.test(valueWithoutFunctions)) { - goog.asserts.fail( - 'String value allows only ' + goog.html.SafeStyle.VALUE_ALLOWED_CHARS_ + - ' and simple functions, got: ' + value); - return goog.html.SafeStyle.INNOCUOUS_STRING; - } else if (!goog.html.SafeStyle.hasBalancedQuotes_(value)) { - goog.asserts.fail('String value requires balanced quotes, got: ' + value); - return goog.html.SafeStyle.INNOCUOUS_STRING; - } - return goog.html.SafeStyle.sanitizeUrl_(value); -}; - - -/** - * 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; -}; - - -/** - * Characters allowed in goog.html.SafeStyle.VALUE_RE_. - * @private {string} - */ -goog.html.SafeStyle.VALUE_ALLOWED_CHARS_ = '[-,."\'%_!# a-zA-Z0-9]'; - - -/** - * 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 expression checks only for XSS safety, not for CSS validity. - * @const {!RegExp} - * @private - */ -goog.html.SafeStyle.VALUE_RE_ = - new RegExp('^' + goog.html.SafeStyle.VALUE_ALLOWED_CHARS_ + '+$'); - - -/** - * Regular expression for url(). We support URLs allowed by - * https://www.w3.org/TR/css-syntax-3/#url-token-diagram without using escape - * sequences. Use percent-encoding if you need to use special characters like - * backslash. - * @private @const {!RegExp} - */ -goog.html.SafeUrl.URL_RE_ = new RegExp( - '\\b(url\\([ \t\n]*)(' + - '\'[ -&(-\\[\\]-~]*\'' + // Printable characters except ' and \. - '|"[ !#-\\[\\]-~]*"' + // Printable characters except " and \. - '|[!#-&*-\\[\\]-~]*' + // Printable characters except [ "'()\\]. - ')([ \t\n]*\\))', - 'g'); - - -/** - * Regular expression for simple functions. - * @private @const {!RegExp} - */ -goog.html.SafeUrl.FUNCTIONS_RE_ = new RegExp( - '\\b(hsl|hsla|rgb|rgba|(rotate|scale|translate)(X|Y|Z|3d)?)' + - '\\([-0-9a-z.%, ]+\\)', - 'g'); - - -/** - * Sanitize URLs inside url(). - * - * NOTE: We could also consider using CSS.escape once that's available in the - * browsers. However, loosely matching URL e.g. with url\(.*\) and then escaping - * the contents would result in a slightly different language than CSS leading - * to confusion of users. E.g. url(")") is valid in CSS but it would be invalid - * as seen by our parser. On the other hand, url(\) is invalid in CSS but our - * parser would be fine with it. - * - * @param {string} value Untrusted CSS property value. - * @return {string} - * @private - */ -goog.html.SafeStyle.sanitizeUrl_ = function(value) { - return value.replace( - goog.html.SafeUrl.URL_RE_, function(match, before, url, after) { - var quote = ''; - url = url.replace(/^(['"])(.*)\1$/, function(match, start, inside) { - quote = start; - return inside; - }); - var sanitized = goog.html.SafeUrl.sanitize(url).getTypedStringValue(); - return before + quote + sanitized + quote + after; - }); -}; - - -/** - * Creates a new SafeStyle object by concatenating the values. - * @param {...(!goog.html.SafeStyle|!Array<!goog.html.SafeStyle>)} var_args - * SafeStyles to concatenate. - * @return {!goog.html.SafeStyle} - */ -goog.html.SafeStyle.concat = function(var_args) { - var style = ''; - - /** - * @param {!goog.html.SafeStyle|!Array<!goog.html.SafeStyle>} 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); -}; |