From cdc6450170b2dc00751a74f0b868a7a8b7f8f624 Mon Sep 17 00:00:00 2001 From: Arzumify Date: Wed, 26 Jun 2024 00:53:44 +0100 Subject: [PATCH] Added a sanitsation layer on top of the sandbox, just in case --- app/index.html | 1 + static/js/main.js | 8 +- static/js/purify.js | 1565 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1570 insertions(+), 4 deletions(-) create mode 100644 static/js/purify.js diff --git a/app/index.html b/app/index.html index 9d7893f..021d0a1 100644 --- a/app/index.html +++ b/app/index.html @@ -9,6 +9,7 @@ + diff --git a/static/js/main.js b/static/js/main.js index afc5672..0d94c2d 100644 --- a/static/js/main.js +++ b/static/js/main.js @@ -192,7 +192,7 @@ function updateFont() { noteBox.style.fontSize = currentFontSize + "px" textSizeBox.innerText = currentFontSize + "px" if (markdowntoggle) { - markdown.srcdoc = "" + marked.parse(noteBox.value) + ""; + markdown.srcdoc = "" + marked.parse(DOMPurify.sanitize(noteBox.value)) + ""; } } @@ -417,7 +417,7 @@ function updateWordCount() { function renderMarkDown() { if (markdowntoggle) { - markdown.srcdoc = "" + marked.parse(noteBox.value) + "" + markdown.srcdoc = "" + marked.parse(DOMPurify.sanitize(noteBox.value)) + "" } } @@ -650,7 +650,7 @@ newNote.addEventListener("click", () => { }); }); function downloadObjectAsJson(exportObj, exportName) { - let dataStr = "data:text/json;charset=utf-8," + encodeURIComponent(JSON.stringify(exportObj)); + let dataStr = "data:text/json;charset=utf-8," + DOMPurify.sanitize(JSON.stringify(exportObj)); let downloadAnchorNode = document.createElement("a"); downloadAnchorNode.setAttribute("href", dataStr); downloadAnchorNode.setAttribute("download", exportName + ".json"); @@ -799,7 +799,7 @@ removeBox.addEventListener("click", () => { }); document.addEventListener("DOMContentLoaded", function() { - markdown.srcdoc = "" + marked.parse(noteBox.value) + "" + markdown.srcdoc = "" + marked.parse(DOMPurify.sanitize(noteBox.value)) + "" }); if (firstNewVersion()) { diff --git a/static/js/purify.js b/static/js/purify.js new file mode 100644 index 0000000..ced8c9a --- /dev/null +++ b/static/js/purify.js @@ -0,0 +1,1565 @@ +// @license magnet:?xt=urn:btih:8e4f440f4c65981c5bf93c76d35135ba5064d8b7&dn=apache-2.0.txt Apache-2.0 + +/*! @license DOMPurify 3.1.5 | (c) Cure53 and other contributors | Released under the Apache license 2.0 and Mozilla Public License 2.0 | github.com/cure53/DOMPurify/blob/3.1.5/LICENSE */ + +(function (global, factory) { + typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : + typeof define === 'function' && define.amd ? define(factory) : + (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.DOMPurify = factory()); +})(this, (function () { 'use strict'; + + const { + entries, + setPrototypeOf, + isFrozen, + getPrototypeOf, + getOwnPropertyDescriptor + } = Object; + let { + freeze, + seal, + create + } = Object; // eslint-disable-line import/no-mutable-exports + let { + apply, + construct + } = typeof Reflect !== 'undefined' && Reflect; + if (!freeze) { + freeze = function freeze(x) { + return x; + }; + } + if (!seal) { + seal = function seal(x) { + return x; + }; + } + if (!apply) { + apply = function apply(fun, thisValue, args) { + return fun.apply(thisValue, args); + }; + } + if (!construct) { + construct = function construct(Func, args) { + return new Func(...args); + }; + } + const arrayForEach = unapply(Array.prototype.forEach); + const arrayPop = unapply(Array.prototype.pop); + const arrayPush = unapply(Array.prototype.push); + const stringToLowerCase = unapply(String.prototype.toLowerCase); + const stringToString = unapply(String.prototype.toString); + const stringMatch = unapply(String.prototype.match); + const stringReplace = unapply(String.prototype.replace); + const stringIndexOf = unapply(String.prototype.indexOf); + const stringTrim = unapply(String.prototype.trim); + const objectHasOwnProperty = unapply(Object.prototype.hasOwnProperty); + const regExpTest = unapply(RegExp.prototype.test); + const typeErrorCreate = unconstruct(TypeError); + + /** + * Creates a new function that calls the given function with a specified thisArg and arguments. + * + * @param {Function} func - The function to be wrapped and called. + * @returns {Function} A new function that calls the given function with a specified thisArg and arguments. + */ + function unapply(func) { + return function (thisArg) { + for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) { + args[_key - 1] = arguments[_key]; + } + return apply(func, thisArg, args); + }; + } + + /** + * Creates a new function that constructs an instance of the given constructor function with the provided arguments. + * + * @param {Function} func - The constructor function to be wrapped and called. + * @returns {Function} A new function that constructs an instance of the given constructor function with the provided arguments. + */ + function unconstruct(func) { + return function () { + for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) { + args[_key2] = arguments[_key2]; + } + return construct(func, args); + }; + } + + /** + * Add properties to a lookup table + * + * @param {Object} set - The set to which elements will be added. + * @param {Array} array - The array containing elements to be added to the set. + * @param {Function} transformCaseFunc - An optional function to transform the case of each element before adding to the set. + * @returns {Object} The modified set with added elements. + */ + function addToSet(set, array) { + let transformCaseFunc = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : stringToLowerCase; + if (setPrototypeOf) { + // Make 'in' and truthy checks like Boolean(set.constructor) + // independent of any properties defined on Object.prototype. + // Prevent prototype setters from intercepting set as a this value. + setPrototypeOf(set, null); + } + let l = array.length; + while (l--) { + let element = array[l]; + if (typeof element === 'string') { + const lcElement = transformCaseFunc(element); + if (lcElement !== element) { + // Config presets (e.g. tags.js, attrs.js) are immutable. + if (!isFrozen(array)) { + array[l] = lcElement; + } + element = lcElement; + } + } + set[element] = true; + } + return set; + } + + /** + * Clean up an array to harden against CSPP + * + * @param {Array} array - The array to be cleaned. + * @returns {Array} The cleaned version of the array + */ + function cleanArray(array) { + for (let index = 0; index < array.length; index++) { + const isPropertyExist = objectHasOwnProperty(array, index); + if (!isPropertyExist) { + array[index] = null; + } + } + return array; + } + + /** + * Shallow clone an object + * + * @param {Object} object - The object to be cloned. + * @returns {Object} A new object that copies the original. + */ + function clone(object) { + const newObject = create(null); + for (const [property, value] of entries(object)) { + const isPropertyExist = objectHasOwnProperty(object, property); + if (isPropertyExist) { + if (Array.isArray(value)) { + newObject[property] = cleanArray(value); + } else if (value && typeof value === 'object' && value.constructor === Object) { + newObject[property] = clone(value); + } else { + newObject[property] = value; + } + } + } + return newObject; + } + + /** + * This method automatically checks if the prop is function or getter and behaves accordingly. + * + * @param {Object} object - The object to look up the getter function in its prototype chain. + * @param {String} prop - The property name for which to find the getter function. + * @returns {Function} The getter function found in the prototype chain or a fallback function. + */ + function lookupGetter(object, prop) { + while (object !== null) { + const desc = getOwnPropertyDescriptor(object, prop); + if (desc) { + if (desc.get) { + return unapply(desc.get); + } + if (typeof desc.value === 'function') { + return unapply(desc.value); + } + } + object = getPrototypeOf(object); + } + function fallbackValue() { + return null; + } + return fallbackValue; + } + + const html$1 = freeze(['a', 'abbr', 'acronym', 'address', 'area', 'article', 'aside', 'audio', 'b', 'bdi', 'bdo', 'big', 'blink', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'content', 'data', 'datalist', 'dd', 'decorator', 'del', 'details', 'dfn', 'dialog', 'dir', 'div', 'dl', 'dt', 'element', 'em', 'fieldset', 'figcaption', 'figure', 'font', 'footer', 'form', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'img', 'input', 'ins', 'kbd', 'label', 'legend', 'li', 'main', 'map', 'mark', 'marquee', 'menu', 'menuitem', 'meter', 'nav', 'nobr', 'ol', 'optgroup', 'option', 'output', 'p', 'picture', 'pre', 'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'section', 'select', 'shadow', 'small', 'source', 'spacer', 'span', 'strike', 'strong', 'style', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'template', 'textarea', 'tfoot', 'th', 'thead', 'time', 'tr', 'track', 'tt', 'u', 'ul', 'var', 'video', 'wbr']); + + // SVG + const svg$1 = freeze(['svg', 'a', 'altglyph', 'altglyphdef', 'altglyphitem', 'animatecolor', 'animatemotion', 'animatetransform', 'circle', 'clippath', 'defs', 'desc', 'ellipse', 'filter', 'font', 'g', 'glyph', 'glyphref', 'hkern', 'image', 'line', 'lineargradient', 'marker', 'mask', 'metadata', 'mpath', 'path', 'pattern', 'polygon', 'polyline', 'radialgradient', 'rect', 'stop', 'style', 'switch', 'symbol', 'text', 'textpath', 'title', 'tref', 'tspan', 'view', 'vkern']); + const svgFilters = freeze(['feBlend', 'feColorMatrix', 'feComponentTransfer', 'feComposite', 'feConvolveMatrix', 'feDiffuseLighting', 'feDisplacementMap', 'feDistantLight', 'feDropShadow', 'feFlood', 'feFuncA', 'feFuncB', 'feFuncG', 'feFuncR', 'feGaussianBlur', 'feImage', 'feMerge', 'feMergeNode', 'feMorphology', 'feOffset', 'fePointLight', 'feSpecularLighting', 'feSpotLight', 'feTile', 'feTurbulence']); + + // List of SVG elements that are disallowed by default. + // We still need to know them so that we can do namespace + // checks properly in case one wants to add them to + // allow-list. + const svgDisallowed = freeze(['animate', 'color-profile', 'cursor', 'discard', 'font-face', 'font-face-format', 'font-face-name', 'font-face-src', 'font-face-uri', 'foreignobject', 'hatch', 'hatchpath', 'mesh', 'meshgradient', 'meshpatch', 'meshrow', 'missing-glyph', 'script', 'set', 'solidcolor', 'unknown', 'use']); + const mathMl$1 = freeze(['math', 'menclose', 'merror', 'mfenced', 'mfrac', 'mglyph', 'mi', 'mlabeledtr', 'mmultiscripts', 'mn', 'mo', 'mover', 'mpadded', 'mphantom', 'mroot', 'mrow', 'ms', 'mspace', 'msqrt', 'mstyle', 'msub', 'msup', 'msubsup', 'mtable', 'mtd', 'mtext', 'mtr', 'munder', 'munderover', 'mprescripts']); + + // Similarly to SVG, we want to know all MathML elements, + // even those that we disallow by default. + const mathMlDisallowed = freeze(['maction', 'maligngroup', 'malignmark', 'mlongdiv', 'mscarries', 'mscarry', 'msgroup', 'mstack', 'msline', 'msrow', 'semantics', 'annotation', 'annotation-xml', 'mprescripts', 'none']); + const text = freeze(['#text']); + + const html = freeze(['accept', 'action', 'align', 'alt', 'autocapitalize', 'autocomplete', 'autopictureinpicture', 'autoplay', 'background', 'bgcolor', 'border', 'capture', 'cellpadding', 'cellspacing', 'checked', 'cite', 'class', 'clear', 'color', 'cols', 'colspan', 'controls', 'controlslist', 'coords', 'crossorigin', 'datetime', 'decoding', 'default', 'dir', 'disabled', 'disablepictureinpicture', 'disableremoteplayback', 'download', 'draggable', 'enctype', 'enterkeyhint', 'face', 'for', 'headers', 'height', 'hidden', 'high', 'href', 'hreflang', 'id', 'inputmode', 'integrity', 'ismap', 'kind', 'label', 'lang', 'list', 'loading', 'loop', 'low', 'max', 'maxlength', 'media', 'method', 'min', 'minlength', 'multiple', 'muted', 'name', 'nonce', 'noshade', 'novalidate', 'nowrap', 'open', 'optimum', 'pattern', 'placeholder', 'playsinline', 'popover', 'popovertarget', 'popovertargetaction', 'poster', 'preload', 'pubdate', 'radiogroup', 'readonly', 'rel', 'required', 'rev', 'reversed', 'role', 'rows', 'rowspan', 'spellcheck', 'scope', 'selected', 'shape', 'size', 'sizes', 'span', 'srclang', 'start', 'src', 'srcset', 'step', 'style', 'summary', 'tabindex', 'title', 'translate', 'type', 'usemap', 'valign', 'value', 'width', 'wrap', 'xmlns', 'slot']); + const svg = freeze(['accent-height', 'accumulate', 'additive', 'alignment-baseline', 'ascent', 'attributename', 'attributetype', 'azimuth', 'basefrequency', 'baseline-shift', 'begin', 'bias', 'by', 'class', 'clip', 'clippathunits', 'clip-path', 'clip-rule', 'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile', 'color-rendering', 'cx', 'cy', 'd', 'dx', 'dy', 'diffuseconstant', 'direction', 'display', 'divisor', 'dur', 'edgemode', 'elevation', 'end', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'filterunits', 'flood-color', 'flood-opacity', 'font-family', 'font-size', 'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'fx', 'fy', 'g1', 'g2', 'glyph-name', 'glyphref', 'gradientunits', 'gradienttransform', 'height', 'href', 'id', 'image-rendering', 'in', 'in2', 'k', 'k1', 'k2', 'k3', 'k4', 'kerning', 'keypoints', 'keysplines', 'keytimes', 'lang', 'lengthadjust', 'letter-spacing', 'kernelmatrix', 'kernelunitlength', 'lighting-color', 'local', 'marker-end', 'marker-mid', 'marker-start', 'markerheight', 'markerunits', 'markerwidth', 'maskcontentunits', 'maskunits', 'max', 'mask', 'media', 'method', 'mode', 'min', 'name', 'numoctaves', 'offset', 'operator', 'opacity', 'order', 'orient', 'orientation', 'origin', 'overflow', 'paint-order', 'path', 'pathlength', 'patterncontentunits', 'patterntransform', 'patternunits', 'points', 'preservealpha', 'preserveaspectratio', 'primitiveunits', 'r', 'rx', 'ry', 'radius', 'refx', 'refy', 'repeatcount', 'repeatdur', 'restart', 'result', 'rotate', 'scale', 'seed', 'shape-rendering', 'specularconstant', 'specularexponent', 'spreadmethod', 'startoffset', 'stddeviation', 'stitchtiles', 'stop-color', 'stop-opacity', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke', 'stroke-width', 'style', 'surfacescale', 'systemlanguage', 'tabindex', 'targetx', 'targety', 'transform', 'transform-origin', 'text-anchor', 'text-decoration', 'text-rendering', 'textlength', 'type', 'u1', 'u2', 'unicode', 'values', 'viewbox', 'visibility', 'version', 'vert-adv-y', 'vert-origin-x', 'vert-origin-y', 'width', 'word-spacing', 'wrap', 'writing-mode', 'xchannelselector', 'ychannelselector', 'x', 'x1', 'x2', 'xmlns', 'y', 'y1', 'y2', 'z', 'zoomandpan']); + const mathMl = freeze(['accent', 'accentunder', 'align', 'bevelled', 'close', 'columnsalign', 'columnlines', 'columnspan', 'denomalign', 'depth', 'dir', 'display', 'displaystyle', 'encoding', 'fence', 'frame', 'height', 'href', 'id', 'largeop', 'length', 'linethickness', 'lspace', 'lquote', 'mathbackground', 'mathcolor', 'mathsize', 'mathvariant', 'maxsize', 'minsize', 'movablelimits', 'notation', 'numalign', 'open', 'rowalign', 'rowlines', 'rowspacing', 'rowspan', 'rspace', 'rquote', 'scriptlevel', 'scriptminsize', 'scriptsizemultiplier', 'selection', 'separator', 'separators', 'stretchy', 'subscriptshift', 'supscriptshift', 'symmetric', 'voffset', 'width', 'xmlns']); + const xml = freeze(['xlink:href', 'xml:id', 'xlink:title', 'xml:space', 'xmlns:xlink']); + + // eslint-disable-next-line unicorn/better-regex + const MUSTACHE_EXPR = seal(/\{\{[\w\W]*|[\w\W]*\}\}/gm); // Specify template detection regex for SAFE_FOR_TEMPLATES mode + const ERB_EXPR = seal(/<%[\w\W]*|[\w\W]*%>/gm); + const TMPLIT_EXPR = seal(/\${[\w\W]*}/gm); + const DATA_ATTR = seal(/^data-[\-\w.\u00B7-\uFFFF]/); // eslint-disable-line no-useless-escape + const ARIA_ATTR = seal(/^aria-[\-\w]+$/); // eslint-disable-line no-useless-escape + const IS_ALLOWED_URI = seal(/^(?:(?:(?:f|ht)tps?|mailto|tel|callto|sms|cid|xmpp):|[^a-z]|[a-z+.\-]+(?:[^a-z+.\-:]|$))/i // eslint-disable-line no-useless-escape + ); + const IS_SCRIPT_OR_DATA = seal(/^(?:\w+script|data):/i); + const ATTR_WHITESPACE = seal(/[\u0000-\u0020\u00A0\u1680\u180E\u2000-\u2029\u205F\u3000]/g // eslint-disable-line no-control-regex + ); + const DOCTYPE_NAME = seal(/^html$/i); + const CUSTOM_ELEMENT = seal(/^[a-z][.\w]*(-[.\w]+)+$/i); + + var EXPRESSIONS = /*#__PURE__*/Object.freeze({ + __proto__: null, + MUSTACHE_EXPR: MUSTACHE_EXPR, + ERB_EXPR: ERB_EXPR, + TMPLIT_EXPR: TMPLIT_EXPR, + DATA_ATTR: DATA_ATTR, + ARIA_ATTR: ARIA_ATTR, + IS_ALLOWED_URI: IS_ALLOWED_URI, + IS_SCRIPT_OR_DATA: IS_SCRIPT_OR_DATA, + ATTR_WHITESPACE: ATTR_WHITESPACE, + DOCTYPE_NAME: DOCTYPE_NAME, + CUSTOM_ELEMENT: CUSTOM_ELEMENT + }); + + // https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType + const NODE_TYPE = { + element: 1, + attribute: 2, + text: 3, + cdataSection: 4, + entityReference: 5, + // Deprecated + entityNode: 6, + // Deprecated + progressingInstruction: 7, + comment: 8, + document: 9, + documentType: 10, + documentFragment: 11, + notation: 12 // Deprecated + }; + const getGlobal = function getGlobal() { + return typeof window === 'undefined' ? null : window; + }; + + /** + * Creates a no-op policy for internal use only. + * Don't export this function outside this module! + * @param {TrustedTypePolicyFactory} trustedTypes The policy factory. + * @param {HTMLScriptElement} purifyHostElement The Script element used to load DOMPurify (to determine policy name suffix). + * @return {TrustedTypePolicy} The policy created (or null, if Trusted Types + * are not supported or creating the policy failed). + */ + const _createTrustedTypesPolicy = function _createTrustedTypesPolicy(trustedTypes, purifyHostElement) { + if (typeof trustedTypes !== 'object' || typeof trustedTypes.createPolicy !== 'function') { + return null; + } + + // Allow the callers to control the unique policy name + // by adding a data-tt-policy-suffix to the script element with the DOMPurify. + // Policy creation with duplicate names throws in Trusted Types. + let suffix = null; + const ATTR_NAME = 'data-tt-policy-suffix'; + if (purifyHostElement && purifyHostElement.hasAttribute(ATTR_NAME)) { + suffix = purifyHostElement.getAttribute(ATTR_NAME); + } + const policyName = 'dompurify' + (suffix ? '#' + suffix : ''); + try { + return trustedTypes.createPolicy(policyName, { + createHTML(html) { + return html; + }, + createScriptURL(scriptUrl) { + return scriptUrl; + } + }); + } catch (_) { + // Policy creation failed (most likely another DOMPurify script has + // already run). Skip creating the policy, as this will only cause errors + // if TT are enforced. + console.warn('TrustedTypes policy ' + policyName + ' could not be created.'); + return null; + } + }; + function createDOMPurify() { + let window = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : getGlobal(); + const DOMPurify = root => createDOMPurify(root); + + /** + * Version label, exposed for easier checks + * if DOMPurify is up to date or not + */ + DOMPurify.version = '3.1.5'; + + /** + * Array of elements that DOMPurify removed during sanitation. + * Empty if nothing was removed. + */ + DOMPurify.removed = []; + if (!window || !window.document || window.document.nodeType !== NODE_TYPE.document) { + // Not running in a browser, provide a factory function + // so that you can pass your own Window + DOMPurify.isSupported = false; + return DOMPurify; + } + let { + document + } = window; + const originalDocument = document; + const currentScript = originalDocument.currentScript; + const { + DocumentFragment, + HTMLTemplateElement, + Node, + Element, + NodeFilter, + NamedNodeMap = window.NamedNodeMap || window.MozNamedAttrMap, + HTMLFormElement, + DOMParser, + trustedTypes + } = window; + const ElementPrototype = Element.prototype; + const cloneNode = lookupGetter(ElementPrototype, 'cloneNode'); + const getNextSibling = lookupGetter(ElementPrototype, 'nextSibling'); + const getChildNodes = lookupGetter(ElementPrototype, 'childNodes'); + const getParentNode = lookupGetter(ElementPrototype, 'parentNode'); + + // As per issue #47, the web-components registry is inherited by a + // new document created via createHTMLDocument. As per the spec + // (http://w3c.github.io/webcomponents/spec/custom/#creating-and-passing-registries) + // a new empty registry is used when creating a template contents owner + // document, so we use that as our parent document to ensure nothing + // is inherited. + if (typeof HTMLTemplateElement === 'function') { + const template = document.createElement('template'); + if (template.content && template.content.ownerDocument) { + document = template.content.ownerDocument; + } + } + let trustedTypesPolicy; + let emptyHTML = ''; + const { + implementation, + createNodeIterator, + createDocumentFragment, + getElementsByTagName + } = document; + const { + importNode + } = originalDocument; + let hooks = {}; + + /** + * Expose whether this browser supports running the full DOMPurify. + */ + DOMPurify.isSupported = typeof entries === 'function' && typeof getParentNode === 'function' && implementation && implementation.createHTMLDocument !== undefined; + const { + MUSTACHE_EXPR, + ERB_EXPR, + TMPLIT_EXPR, + DATA_ATTR, + ARIA_ATTR, + IS_SCRIPT_OR_DATA, + ATTR_WHITESPACE, + CUSTOM_ELEMENT + } = EXPRESSIONS; + let { + IS_ALLOWED_URI: IS_ALLOWED_URI$1 + } = EXPRESSIONS; + + /** + * We consider the elements and attributes below to be safe. Ideally + * don't add any new ones but feel free to remove unwanted ones. + */ + + /* allowed element names */ + let ALLOWED_TAGS = null; + const DEFAULT_ALLOWED_TAGS = addToSet({}, [...html$1, ...svg$1, ...svgFilters, ...mathMl$1, ...text]); + + /* Allowed attribute names */ + let ALLOWED_ATTR = null; + const DEFAULT_ALLOWED_ATTR = addToSet({}, [...html, ...svg, ...mathMl, ...xml]); + + /* + * Configure how DOMPUrify should handle custom elements and their attributes as well as customized built-in elements. + * @property {RegExp|Function|null} tagNameCheck one of [null, regexPattern, predicate]. Default: `null` (disallow any custom elements) + * @property {RegExp|Function|null} attributeNameCheck one of [null, regexPattern, predicate]. Default: `null` (disallow any attributes not on the allow list) + * @property {boolean} allowCustomizedBuiltInElements allow custom elements derived from built-ins if they pass CUSTOM_ELEMENT_HANDLING.tagNameCheck. Default: `false`. + */ + let CUSTOM_ELEMENT_HANDLING = Object.seal(create(null, { + tagNameCheck: { + writable: true, + configurable: false, + enumerable: true, + value: null + }, + attributeNameCheck: { + writable: true, + configurable: false, + enumerable: true, + value: null + }, + allowCustomizedBuiltInElements: { + writable: true, + configurable: false, + enumerable: true, + value: false + } + })); + + /* Explicitly forbidden tags (overrides ALLOWED_TAGS/ADD_TAGS) */ + let FORBID_TAGS = null; + + /* Explicitly forbidden attributes (overrides ALLOWED_ATTR/ADD_ATTR) */ + let FORBID_ATTR = null; + + /* Decide if ARIA attributes are okay */ + let ALLOW_ARIA_ATTR = true; + + /* Decide if custom data attributes are okay */ + let ALLOW_DATA_ATTR = true; + + /* Decide if unknown protocols are okay */ + let ALLOW_UNKNOWN_PROTOCOLS = false; + + /* Decide if self-closing tags in attributes are allowed. + * Usually removed due to a mXSS issue in jQuery 3.0 */ + let ALLOW_SELF_CLOSE_IN_ATTR = true; + + /* Output should be safe for common template engines. + * This means, DOMPurify removes data attributes, mustaches and ERB + */ + let SAFE_FOR_TEMPLATES = false; + + /* Output should be safe even for XML used within HTML and alike. + * This means, DOMPurify removes comments when containing risky content. + */ + let SAFE_FOR_XML = true; + + /* Decide if document with ... should be returned */ + let WHOLE_DOCUMENT = false; + + /* Track whether config is already set on this instance of DOMPurify. */ + let SET_CONFIG = false; + + /* Decide if all elements (e.g. style, script) must be children of + * document.body. By default, browsers might move them to document.head */ + let FORCE_BODY = false; + + /* Decide if a DOM `HTMLBodyElement` should be returned, instead of a html + * string (or a TrustedHTML object if Trusted Types are supported). + * If `WHOLE_DOCUMENT` is enabled a `HTMLHtmlElement` will be returned instead + */ + let RETURN_DOM = false; + + /* Decide if a DOM `DocumentFragment` should be returned, instead of a html + * string (or a TrustedHTML object if Trusted Types are supported) */ + let RETURN_DOM_FRAGMENT = false; + + /* Try to return a Trusted Type object instead of a string, return a string in + * case Trusted Types are not supported */ + let RETURN_TRUSTED_TYPE = false; + + /* Output should be free from DOM clobbering attacks? + * This sanitizes markups named with colliding, clobberable built-in DOM APIs. + */ + let SANITIZE_DOM = true; + + /* Achieve full DOM Clobbering protection by isolating the namespace of named + * properties and JS variables, mitigating attacks that abuse the HTML/DOM spec rules. + * + * HTML/DOM spec rules that enable DOM Clobbering: + * - Named Access on Window (§7.3.3) + * - DOM Tree Accessors (§3.1.5) + * - Form Element Parent-Child Relations (§4.10.3) + * - Iframe srcdoc / Nested WindowProxies (§4.8.5) + * - HTMLCollection (§4.2.10.2) + * + * Namespace isolation is implemented by prefixing `id` and `name` attributes + * with a constant string, i.e., `user-content-` + */ + let SANITIZE_NAMED_PROPS = false; + const SANITIZE_NAMED_PROPS_PREFIX = 'user-content-'; + + /* Keep element content when removing element? */ + let KEEP_CONTENT = true; + + /* If a `Node` is passed to sanitize(), then performs sanitization in-place instead + * of importing it into a new Document and returning a sanitized copy */ + let IN_PLACE = false; + + /* Allow usage of profiles like html, svg and mathMl */ + let USE_PROFILES = {}; + + /* Tags to ignore content of when KEEP_CONTENT is true */ + let FORBID_CONTENTS = null; + const DEFAULT_FORBID_CONTENTS = addToSet({}, ['annotation-xml', 'audio', 'colgroup', 'desc', 'foreignobject', 'head', 'iframe', 'math', 'mi', 'mn', 'mo', 'ms', 'mtext', 'noembed', 'noframes', 'noscript', 'plaintext', 'script', 'style', 'svg', 'template', 'thead', 'title', 'video', 'xmp']); + + /* Tags that are safe for data: URIs */ + let DATA_URI_TAGS = null; + const DEFAULT_DATA_URI_TAGS = addToSet({}, ['audio', 'video', 'img', 'source', 'image', 'track']); + + /* Attributes safe for values like "javascript:" */ + let URI_SAFE_ATTRIBUTES = null; + const DEFAULT_URI_SAFE_ATTRIBUTES = addToSet({}, ['alt', 'class', 'for', 'id', 'label', 'name', 'pattern', 'placeholder', 'role', 'summary', 'title', 'value', 'style', 'xmlns']); + const MATHML_NAMESPACE = 'http://www.w3.org/1998/Math/MathML'; + const SVG_NAMESPACE = 'http://www.w3.org/2000/svg'; + const HTML_NAMESPACE = 'http://www.w3.org/1999/xhtml'; + /* Document namespace */ + let NAMESPACE = HTML_NAMESPACE; + let IS_EMPTY_INPUT = false; + + /* Allowed XHTML+XML namespaces */ + let ALLOWED_NAMESPACES = null; + const DEFAULT_ALLOWED_NAMESPACES = addToSet({}, [MATHML_NAMESPACE, SVG_NAMESPACE, HTML_NAMESPACE], stringToString); + + /* Parsing of strict XHTML documents */ + let PARSER_MEDIA_TYPE = null; + const SUPPORTED_PARSER_MEDIA_TYPES = ['application/xhtml+xml', 'text/html']; + const DEFAULT_PARSER_MEDIA_TYPE = 'text/html'; + let transformCaseFunc = null; + + /* Keep a reference to config to pass to hooks */ + let CONFIG = null; + + /* Ideally, do not touch anything below this line */ + /* ______________________________________________ */ + + const formElement = document.createElement('form'); + const isRegexOrFunction = function isRegexOrFunction(testValue) { + return testValue instanceof RegExp || testValue instanceof Function; + }; + + /** + * _parseConfig + * + * @param {Object} cfg optional config literal + */ + // eslint-disable-next-line complexity + const _parseConfig = function _parseConfig() { + let cfg = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {}; + if (CONFIG && CONFIG === cfg) { + return; + } + + /* Shield configuration object from tampering */ + if (!cfg || typeof cfg !== 'object') { + cfg = {}; + } + + /* Shield configuration object from prototype pollution */ + cfg = clone(cfg); + PARSER_MEDIA_TYPE = + // eslint-disable-next-line unicorn/prefer-includes + SUPPORTED_PARSER_MEDIA_TYPES.indexOf(cfg.PARSER_MEDIA_TYPE) === -1 ? DEFAULT_PARSER_MEDIA_TYPE : cfg.PARSER_MEDIA_TYPE; + + // HTML tags and attributes are not case-sensitive, converting to lowercase. Keeping XHTML as is. + transformCaseFunc = PARSER_MEDIA_TYPE === 'application/xhtml+xml' ? stringToString : stringToLowerCase; + + /* Set configuration parameters */ + ALLOWED_TAGS = objectHasOwnProperty(cfg, 'ALLOWED_TAGS') ? addToSet({}, cfg.ALLOWED_TAGS, transformCaseFunc) : DEFAULT_ALLOWED_TAGS; + ALLOWED_ATTR = objectHasOwnProperty(cfg, 'ALLOWED_ATTR') ? addToSet({}, cfg.ALLOWED_ATTR, transformCaseFunc) : DEFAULT_ALLOWED_ATTR; + ALLOWED_NAMESPACES = objectHasOwnProperty(cfg, 'ALLOWED_NAMESPACES') ? addToSet({}, cfg.ALLOWED_NAMESPACES, stringToString) : DEFAULT_ALLOWED_NAMESPACES; + URI_SAFE_ATTRIBUTES = objectHasOwnProperty(cfg, 'ADD_URI_SAFE_ATTR') ? addToSet(clone(DEFAULT_URI_SAFE_ATTRIBUTES), + // eslint-disable-line indent + cfg.ADD_URI_SAFE_ATTR, + // eslint-disable-line indent + transformCaseFunc // eslint-disable-line indent + ) // eslint-disable-line indent + : DEFAULT_URI_SAFE_ATTRIBUTES; + DATA_URI_TAGS = objectHasOwnProperty(cfg, 'ADD_DATA_URI_TAGS') ? addToSet(clone(DEFAULT_DATA_URI_TAGS), + // eslint-disable-line indent + cfg.ADD_DATA_URI_TAGS, + // eslint-disable-line indent + transformCaseFunc // eslint-disable-line indent + ) // eslint-disable-line indent + : DEFAULT_DATA_URI_TAGS; + FORBID_CONTENTS = objectHasOwnProperty(cfg, 'FORBID_CONTENTS') ? addToSet({}, cfg.FORBID_CONTENTS, transformCaseFunc) : DEFAULT_FORBID_CONTENTS; + FORBID_TAGS = objectHasOwnProperty(cfg, 'FORBID_TAGS') ? addToSet({}, cfg.FORBID_TAGS, transformCaseFunc) : {}; + FORBID_ATTR = objectHasOwnProperty(cfg, 'FORBID_ATTR') ? addToSet({}, cfg.FORBID_ATTR, transformCaseFunc) : {}; + USE_PROFILES = objectHasOwnProperty(cfg, 'USE_PROFILES') ? cfg.USE_PROFILES : false; + ALLOW_ARIA_ATTR = cfg.ALLOW_ARIA_ATTR !== false; // Default true + ALLOW_DATA_ATTR = cfg.ALLOW_DATA_ATTR !== false; // Default true + ALLOW_UNKNOWN_PROTOCOLS = cfg.ALLOW_UNKNOWN_PROTOCOLS || false; // Default false + ALLOW_SELF_CLOSE_IN_ATTR = cfg.ALLOW_SELF_CLOSE_IN_ATTR !== false; // Default true + SAFE_FOR_TEMPLATES = cfg.SAFE_FOR_TEMPLATES || false; // Default false + SAFE_FOR_XML = cfg.SAFE_FOR_XML !== false; // Default true + WHOLE_DOCUMENT = cfg.WHOLE_DOCUMENT || false; // Default false + RETURN_DOM = cfg.RETURN_DOM || false; // Default false + RETURN_DOM_FRAGMENT = cfg.RETURN_DOM_FRAGMENT || false; // Default false + RETURN_TRUSTED_TYPE = cfg.RETURN_TRUSTED_TYPE || false; // Default false + FORCE_BODY = cfg.FORCE_BODY || false; // Default false + SANITIZE_DOM = cfg.SANITIZE_DOM !== false; // Default true + SANITIZE_NAMED_PROPS = cfg.SANITIZE_NAMED_PROPS || false; // Default false + KEEP_CONTENT = cfg.KEEP_CONTENT !== false; // Default true + IN_PLACE = cfg.IN_PLACE || false; // Default false + IS_ALLOWED_URI$1 = cfg.ALLOWED_URI_REGEXP || IS_ALLOWED_URI; + NAMESPACE = cfg.NAMESPACE || HTML_NAMESPACE; + CUSTOM_ELEMENT_HANDLING = cfg.CUSTOM_ELEMENT_HANDLING || {}; + if (cfg.CUSTOM_ELEMENT_HANDLING && isRegexOrFunction(cfg.CUSTOM_ELEMENT_HANDLING.tagNameCheck)) { + CUSTOM_ELEMENT_HANDLING.tagNameCheck = cfg.CUSTOM_ELEMENT_HANDLING.tagNameCheck; + } + if (cfg.CUSTOM_ELEMENT_HANDLING && isRegexOrFunction(cfg.CUSTOM_ELEMENT_HANDLING.attributeNameCheck)) { + CUSTOM_ELEMENT_HANDLING.attributeNameCheck = cfg.CUSTOM_ELEMENT_HANDLING.attributeNameCheck; + } + if (cfg.CUSTOM_ELEMENT_HANDLING && typeof cfg.CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements === 'boolean') { + CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements = cfg.CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements; + } + if (SAFE_FOR_TEMPLATES) { + ALLOW_DATA_ATTR = false; + } + if (RETURN_DOM_FRAGMENT) { + RETURN_DOM = true; + } + + /* Parse profile info */ + if (USE_PROFILES) { + ALLOWED_TAGS = addToSet({}, text); + ALLOWED_ATTR = []; + if (USE_PROFILES.html === true) { + addToSet(ALLOWED_TAGS, html$1); + addToSet(ALLOWED_ATTR, html); + } + if (USE_PROFILES.svg === true) { + addToSet(ALLOWED_TAGS, svg$1); + addToSet(ALLOWED_ATTR, svg); + addToSet(ALLOWED_ATTR, xml); + } + if (USE_PROFILES.svgFilters === true) { + addToSet(ALLOWED_TAGS, svgFilters); + addToSet(ALLOWED_ATTR, svg); + addToSet(ALLOWED_ATTR, xml); + } + if (USE_PROFILES.mathMl === true) { + addToSet(ALLOWED_TAGS, mathMl$1); + addToSet(ALLOWED_ATTR, mathMl); + addToSet(ALLOWED_ATTR, xml); + } + } + + /* Merge configuration parameters */ + if (cfg.ADD_TAGS) { + if (ALLOWED_TAGS === DEFAULT_ALLOWED_TAGS) { + ALLOWED_TAGS = clone(ALLOWED_TAGS); + } + addToSet(ALLOWED_TAGS, cfg.ADD_TAGS, transformCaseFunc); + } + if (cfg.ADD_ATTR) { + if (ALLOWED_ATTR === DEFAULT_ALLOWED_ATTR) { + ALLOWED_ATTR = clone(ALLOWED_ATTR); + } + addToSet(ALLOWED_ATTR, cfg.ADD_ATTR, transformCaseFunc); + } + if (cfg.ADD_URI_SAFE_ATTR) { + addToSet(URI_SAFE_ATTRIBUTES, cfg.ADD_URI_SAFE_ATTR, transformCaseFunc); + } + if (cfg.FORBID_CONTENTS) { + if (FORBID_CONTENTS === DEFAULT_FORBID_CONTENTS) { + FORBID_CONTENTS = clone(FORBID_CONTENTS); + } + addToSet(FORBID_CONTENTS, cfg.FORBID_CONTENTS, transformCaseFunc); + } + + /* Add #text in case KEEP_CONTENT is set to true */ + if (KEEP_CONTENT) { + ALLOWED_TAGS['#text'] = true; + } + + /* Add html, head and body to ALLOWED_TAGS in case WHOLE_DOCUMENT is true */ + if (WHOLE_DOCUMENT) { + addToSet(ALLOWED_TAGS, ['html', 'head', 'body']); + } + + /* Add tbody to ALLOWED_TAGS in case tables are permitted, see #286, #365 */ + if (ALLOWED_TAGS.table) { + addToSet(ALLOWED_TAGS, ['tbody']); + delete FORBID_TAGS.tbody; + } + if (cfg.TRUSTED_TYPES_POLICY) { + if (typeof cfg.TRUSTED_TYPES_POLICY.createHTML !== 'function') { + throw typeErrorCreate('TRUSTED_TYPES_POLICY configuration option must provide a "createHTML" hook.'); + } + if (typeof cfg.TRUSTED_TYPES_POLICY.createScriptURL !== 'function') { + throw typeErrorCreate('TRUSTED_TYPES_POLICY configuration option must provide a "createScriptURL" hook.'); + } + + // Overwrite existing TrustedTypes policy. + trustedTypesPolicy = cfg.TRUSTED_TYPES_POLICY; + + // Sign local variables required by `sanitize`. + emptyHTML = trustedTypesPolicy.createHTML(''); + } else { + // Uninitialized policy, attempt to initialize the internal dompurify policy. + if (trustedTypesPolicy === undefined) { + trustedTypesPolicy = _createTrustedTypesPolicy(trustedTypes, currentScript); + } + + // If creating the internal policy succeeded sign internal variables. + if (trustedTypesPolicy !== null && typeof emptyHTML === 'string') { + emptyHTML = trustedTypesPolicy.createHTML(''); + } + } + + // Prevent further manipulation of configuration. + // Not available in IE8, Safari 5, etc. + if (freeze) { + freeze(cfg); + } + CONFIG = cfg; + }; + const MATHML_TEXT_INTEGRATION_POINTS = addToSet({}, ['mi', 'mo', 'mn', 'ms', 'mtext']); + const HTML_INTEGRATION_POINTS = addToSet({}, ['foreignobject', 'annotation-xml']); + + // Certain elements are allowed in both SVG and HTML + // namespace. We need to specify them explicitly + // so that they don't get erroneously deleted from + // HTML namespace. + const COMMON_SVG_AND_HTML_ELEMENTS = addToSet({}, ['title', 'style', 'font', 'a', 'script']); + + /* Keep track of all possible SVG and MathML tags + * so that we can perform the namespace checks + * correctly. */ + const ALL_SVG_TAGS = addToSet({}, [...svg$1, ...svgFilters, ...svgDisallowed]); + const ALL_MATHML_TAGS = addToSet({}, [...mathMl$1, ...mathMlDisallowed]); + + /** + * @param {Element} element a DOM element whose namespace is being checked + * @returns {boolean} Return false if the element has a + * namespace that a spec-compliant parser would never + * return. Return true otherwise. + */ + const _checkValidNamespace = function _checkValidNamespace(element) { + let parent = getParentNode(element); + + // In JSDOM, if we're inside shadow DOM, then parentNode + // can be null. We just simulate parent in this case. + if (!parent || !parent.tagName) { + parent = { + namespaceURI: NAMESPACE, + tagName: 'template' + }; + } + const tagName = stringToLowerCase(element.tagName); + const parentTagName = stringToLowerCase(parent.tagName); + if (!ALLOWED_NAMESPACES[element.namespaceURI]) { + return false; + } + if (element.namespaceURI === SVG_NAMESPACE) { + // The only way to switch from HTML namespace to SVG + // is via . If it happens via any other tag, then + // it should be killed. + if (parent.namespaceURI === HTML_NAMESPACE) { + return tagName === 'svg'; + } + + // The only way to switch from MathML to SVG is via` + // svg if parent is either or MathML + // text integration points. + if (parent.namespaceURI === MATHML_NAMESPACE) { + return tagName === 'svg' && (parentTagName === 'annotation-xml' || MATHML_TEXT_INTEGRATION_POINTS[parentTagName]); + } + + // We only allow elements that are defined in SVG + // spec. All others are disallowed in SVG namespace. + return Boolean(ALL_SVG_TAGS[tagName]); + } + if (element.namespaceURI === MATHML_NAMESPACE) { + // The only way to switch from HTML namespace to MathML + // is via . If it happens via any other tag, then + // it should be killed. + if (parent.namespaceURI === HTML_NAMESPACE) { + return tagName === 'math'; + } + + // The only way to switch from SVG to MathML is via + // and HTML integration points + if (parent.namespaceURI === SVG_NAMESPACE) { + return tagName === 'math' && HTML_INTEGRATION_POINTS[parentTagName]; + } + + // We only allow elements that are defined in MathML + // spec. All others are disallowed in MathML namespace. + return Boolean(ALL_MATHML_TAGS[tagName]); + } + if (element.namespaceURI === HTML_NAMESPACE) { + // The only way to switch from SVG to HTML is via + // HTML integration points, and from MathML to HTML + // is via MathML text integration points + if (parent.namespaceURI === SVG_NAMESPACE && !HTML_INTEGRATION_POINTS[parentTagName]) { + return false; + } + if (parent.namespaceURI === MATHML_NAMESPACE && !MATHML_TEXT_INTEGRATION_POINTS[parentTagName]) { + return false; + } + + // We disallow tags that are specific for MathML + // or SVG and should never appear in HTML namespace + return !ALL_MATHML_TAGS[tagName] && (COMMON_SVG_AND_HTML_ELEMENTS[tagName] || !ALL_SVG_TAGS[tagName]); + } + + // For XHTML and XML documents that support custom namespaces + if (PARSER_MEDIA_TYPE === 'application/xhtml+xml' && ALLOWED_NAMESPACES[element.namespaceURI]) { + return true; + } + + // The code should never reach this place (this means + // that the element somehow got namespace that is not + // HTML, SVG, MathML or allowed via ALLOWED_NAMESPACES). + // Return false just in case. + return false; + }; + + /** + * _forceRemove + * + * @param {Node} node a DOM node + */ + const _forceRemove = function _forceRemove(node) { + arrayPush(DOMPurify.removed, { + element: node + }); + try { + // eslint-disable-next-line unicorn/prefer-dom-node-remove + node.parentNode.removeChild(node); + } catch (_) { + node.remove(); + } + }; + + /** + * _removeAttribute + * + * @param {String} name an Attribute name + * @param {Node} node a DOM node + */ + const _removeAttribute = function _removeAttribute(name, node) { + try { + arrayPush(DOMPurify.removed, { + attribute: node.getAttributeNode(name), + from: node + }); + } catch (_) { + arrayPush(DOMPurify.removed, { + attribute: null, + from: node + }); + } + node.removeAttribute(name); + + // We void attribute values for unremovable "is"" attributes + if (name === 'is' && !ALLOWED_ATTR[name]) { + if (RETURN_DOM || RETURN_DOM_FRAGMENT) { + try { + _forceRemove(node); + } catch (_) {} + } else { + try { + node.setAttribute(name, ''); + } catch (_) {} + } + } + }; + + /** + * _initDocument + * + * @param {String} dirty a string of dirty markup + * @return {Document} a DOM, filled with the dirty markup + */ + const _initDocument = function _initDocument(dirty) { + /* Create a HTML document */ + let doc = null; + let leadingWhitespace = null; + if (FORCE_BODY) { + dirty = '' + dirty; + } else { + /* If FORCE_BODY isn't used, leading whitespace needs to be preserved manually */ + const matches = stringMatch(dirty, /^[\r\n\t ]+/); + leadingWhitespace = matches && matches[0]; + } + if (PARSER_MEDIA_TYPE === 'application/xhtml+xml' && NAMESPACE === HTML_NAMESPACE) { + // Root of XHTML doc must contain xmlns declaration (see https://www.w3.org/TR/xhtml1/normative.html#strict) + dirty = '' + dirty + ''; + } + const dirtyPayload = trustedTypesPolicy ? trustedTypesPolicy.createHTML(dirty) : dirty; + /* + * Use the DOMParser API by default, fallback later if needs be + * DOMParser not work for svg when has multiple root element. + */ + if (NAMESPACE === HTML_NAMESPACE) { + try { + doc = new DOMParser().parseFromString(dirtyPayload, PARSER_MEDIA_TYPE); + } catch (_) {} + } + + /* Use createHTMLDocument in case DOMParser is not available */ + if (!doc || !doc.documentElement) { + doc = implementation.createDocument(NAMESPACE, 'template', null); + try { + doc.documentElement.innerHTML = IS_EMPTY_INPUT ? emptyHTML : dirtyPayload; + } catch (_) { + // Syntax error if dirtyPayload is invalid xml + } + } + const body = doc.body || doc.documentElement; + if (dirty && leadingWhitespace) { + body.insertBefore(document.createTextNode(leadingWhitespace), body.childNodes[0] || null); + } + + /* Work on whole document or just its body */ + if (NAMESPACE === HTML_NAMESPACE) { + return getElementsByTagName.call(doc, WHOLE_DOCUMENT ? 'html' : 'body')[0]; + } + return WHOLE_DOCUMENT ? doc.documentElement : body; + }; + + /** + * Creates a NodeIterator object that you can use to traverse filtered lists of nodes or elements in a document. + * + * @param {Node} root The root element or node to start traversing on. + * @return {NodeIterator} The created NodeIterator + */ + const _createNodeIterator = function _createNodeIterator(root) { + return createNodeIterator.call(root.ownerDocument || root, root, + // eslint-disable-next-line no-bitwise + NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_COMMENT | NodeFilter.SHOW_TEXT | NodeFilter.SHOW_PROCESSING_INSTRUCTION | NodeFilter.SHOW_CDATA_SECTION, null); + }; + + /** + * _isClobbered + * + * @param {Node} elm element to check for clobbering attacks + * @return {Boolean} true if clobbered, false if safe + */ + const _isClobbered = function _isClobbered(elm) { + return elm instanceof HTMLFormElement && (typeof elm.nodeName !== 'string' || typeof elm.textContent !== 'string' || typeof elm.removeChild !== 'function' || !(elm.attributes instanceof NamedNodeMap) || typeof elm.removeAttribute !== 'function' || typeof elm.setAttribute !== 'function' || typeof elm.namespaceURI !== 'string' || typeof elm.insertBefore !== 'function' || typeof elm.hasChildNodes !== 'function'); + }; + + /** + * Checks whether the given object is a DOM node. + * + * @param {Node} object object to check whether it's a DOM node + * @return {Boolean} true is object is a DOM node + */ + const _isNode = function _isNode(object) { + return typeof Node === 'function' && object instanceof Node; + }; + + /** + * _executeHook + * Execute user configurable hooks + * + * @param {String} entryPoint Name of the hook's entry point + * @param {Node} currentNode node to work on with the hook + * @param {Object} data additional hook parameters + */ + const _executeHook = function _executeHook(entryPoint, currentNode, data) { + if (!hooks[entryPoint]) { + return; + } + arrayForEach(hooks[entryPoint], hook => { + hook.call(DOMPurify, currentNode, data, CONFIG); + }); + }; + + /** + * _sanitizeElements + * + * @protect nodeName + * @protect textContent + * @protect removeChild + * + * @param {Node} currentNode to check for permission to exist + * @return {Boolean} true if node was killed, false if left alive + */ + const _sanitizeElements = function _sanitizeElements(currentNode) { + let content = null; + + /* Execute a hook if present */ + _executeHook('beforeSanitizeElements', currentNode, null); + + /* Check if element is clobbered or can clobber */ + if (_isClobbered(currentNode)) { + _forceRemove(currentNode); + return true; + } + + /* Now let's check the element's type and name */ + const tagName = transformCaseFunc(currentNode.nodeName); + + /* Execute a hook if present */ + _executeHook('uponSanitizeElement', currentNode, { + tagName, + allowedTags: ALLOWED_TAGS + }); + + /* Detect mXSS attempts abusing namespace confusion */ + if (currentNode.hasChildNodes() && !_isNode(currentNode.firstElementChild) && regExpTest(/<[/\w]/g, currentNode.innerHTML) && regExpTest(/<[/\w]/g, currentNode.textContent)) { + _forceRemove(currentNode); + return true; + } + + /* Remove any occurrence of processing instructions */ + if (currentNode.nodeType === NODE_TYPE.progressingInstruction) { + _forceRemove(currentNode); + return true; + } + + /* Remove any kind of possibly harmful comments */ + if (SAFE_FOR_XML && currentNode.nodeType === NODE_TYPE.comment && regExpTest(/<[/\w]/g, currentNode.data)) { + _forceRemove(currentNode); + return true; + } + + /* Remove element if anything forbids its presence */ + if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) { + /* Check if we have a custom element to handle */ + if (!FORBID_TAGS[tagName] && _isBasicCustomElement(tagName)) { + if (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.tagNameCheck, tagName)) { + return false; + } + if (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.tagNameCheck(tagName)) { + return false; + } + } + + /* Keep content except for bad-listed elements */ + if (KEEP_CONTENT && !FORBID_CONTENTS[tagName]) { + const parentNode = getParentNode(currentNode) || currentNode.parentNode; + const childNodes = getChildNodes(currentNode) || currentNode.childNodes; + if (childNodes && parentNode) { + const childCount = childNodes.length; + for (let i = childCount - 1; i >= 0; --i) { + const childClone = cloneNode(childNodes[i], true); + childClone.__removalCount = (currentNode.__removalCount || 0) + 1; + parentNode.insertBefore(childClone, getNextSibling(currentNode)); + } + } + } + _forceRemove(currentNode); + return true; + } + + /* Check whether element has a valid namespace */ + if (currentNode instanceof Element && !_checkValidNamespace(currentNode)) { + _forceRemove(currentNode); + return true; + } + + /* Make sure that older browsers don't get fallback-tag mXSS */ + if ((tagName === 'noscript' || tagName === 'noembed' || tagName === 'noframes') && regExpTest(/<\/no(script|embed|frames)/i, currentNode.innerHTML)) { + _forceRemove(currentNode); + return true; + } + + /* Sanitize element content to be template-safe */ + if (SAFE_FOR_TEMPLATES && currentNode.nodeType === NODE_TYPE.text) { + /* Get the element's text content */ + content = currentNode.textContent; + arrayForEach([MUSTACHE_EXPR, ERB_EXPR, TMPLIT_EXPR], expr => { + content = stringReplace(content, expr, ' '); + }); + if (currentNode.textContent !== content) { + arrayPush(DOMPurify.removed, { + element: currentNode.cloneNode() + }); + currentNode.textContent = content; + } + } + + /* Execute a hook if present */ + _executeHook('afterSanitizeElements', currentNode, null); + return false; + }; + + /** + * _isValidAttribute + * + * @param {string} lcTag Lowercase tag name of containing element. + * @param {string} lcName Lowercase attribute name. + * @param {string} value Attribute value. + * @return {Boolean} Returns true if `value` is valid, otherwise false. + */ + // eslint-disable-next-line complexity + const _isValidAttribute = function _isValidAttribute(lcTag, lcName, value) { + /* Make sure attribute cannot clobber */ + if (SANITIZE_DOM && (lcName === 'id' || lcName === 'name') && (value in document || value in formElement)) { + return false; + } + + /* Allow valid data-* attributes: At least one character after "-" + (https://html.spec.whatwg.org/multipage/dom.html#embedding-custom-non-visible-data-with-the-data-*-attributes) + XML-compatible (https://html.spec.whatwg.org/multipage/infrastructure.html#xml-compatible and http://www.w3.org/TR/xml/#d0e804) + We don't need to check the value; it's always URI safe. */ + if (ALLOW_DATA_ATTR && !FORBID_ATTR[lcName] && regExpTest(DATA_ATTR, lcName)) ; else if (ALLOW_ARIA_ATTR && regExpTest(ARIA_ATTR, lcName)) ; else if (!ALLOWED_ATTR[lcName] || FORBID_ATTR[lcName]) { + if ( + // First condition does a very basic check if a) it's basically a valid custom element tagname AND + // b) if the tagName passes whatever the user has configured for CUSTOM_ELEMENT_HANDLING.tagNameCheck + // and c) if the attribute name passes whatever the user has configured for CUSTOM_ELEMENT_HANDLING.attributeNameCheck + _isBasicCustomElement(lcTag) && (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.tagNameCheck, lcTag) || CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.tagNameCheck(lcTag)) && (CUSTOM_ELEMENT_HANDLING.attributeNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.attributeNameCheck, lcName) || CUSTOM_ELEMENT_HANDLING.attributeNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.attributeNameCheck(lcName)) || + // Alternative, second condition checks if it's an `is`-attribute, AND + // the value passes whatever the user has configured for CUSTOM_ELEMENT_HANDLING.tagNameCheck + lcName === 'is' && CUSTOM_ELEMENT_HANDLING.allowCustomizedBuiltInElements && (CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof RegExp && regExpTest(CUSTOM_ELEMENT_HANDLING.tagNameCheck, value) || CUSTOM_ELEMENT_HANDLING.tagNameCheck instanceof Function && CUSTOM_ELEMENT_HANDLING.tagNameCheck(value))) ; else { + return false; + } + /* Check value is safe. First, is attr inert? If so, is safe */ + } else if (URI_SAFE_ATTRIBUTES[lcName]) ; else if (regExpTest(IS_ALLOWED_URI$1, stringReplace(value, ATTR_WHITESPACE, ''))) ; else if ((lcName === 'src' || lcName === 'xlink:href' || lcName === 'href') && lcTag !== 'script' && stringIndexOf(value, 'data:') === 0 && DATA_URI_TAGS[lcTag]) ; else if (ALLOW_UNKNOWN_PROTOCOLS && !regExpTest(IS_SCRIPT_OR_DATA, stringReplace(value, ATTR_WHITESPACE, ''))) ; else if (value) { + return false; + } else ; + return true; + }; + + /** + * _isBasicCustomElement + * checks if at least one dash is included in tagName, and it's not the first char + * for more sophisticated checking see https://github.com/sindresorhus/validate-element-name + * + * @param {string} tagName name of the tag of the node to sanitize + * @returns {boolean} Returns true if the tag name meets the basic criteria for a custom element, otherwise false. + */ + const _isBasicCustomElement = function _isBasicCustomElement(tagName) { + return tagName !== 'annotation-xml' && stringMatch(tagName, CUSTOM_ELEMENT); + }; + + /** + * _sanitizeAttributes + * + * @protect attributes + * @protect nodeName + * @protect removeAttribute + * @protect setAttribute + * + * @param {Node} currentNode to sanitize + */ + const _sanitizeAttributes = function _sanitizeAttributes(currentNode) { + /* Execute a hook if present */ + _executeHook('beforeSanitizeAttributes', currentNode, null); + const { + attributes + } = currentNode; + + /* Check if we have attributes; if not we might have a text node */ + if (!attributes) { + return; + } + const hookEvent = { + attrName: '', + attrValue: '', + keepAttr: true, + allowedAttributes: ALLOWED_ATTR + }; + let l = attributes.length; + + /* Go backwards over all attributes; safely remove bad ones */ + while (l--) { + const attr = attributes[l]; + const { + name, + namespaceURI, + value: attrValue + } = attr; + const lcName = transformCaseFunc(name); + let value = name === 'value' ? attrValue : stringTrim(attrValue); + + /* Execute a hook if present */ + hookEvent.attrName = lcName; + hookEvent.attrValue = value; + hookEvent.keepAttr = true; + hookEvent.forceKeepAttr = undefined; // Allows developers to see this is a property they can set + _executeHook('uponSanitizeAttribute', currentNode, hookEvent); + value = hookEvent.attrValue; + + /* Work around a security issue with comments inside attributes */ + if (SAFE_FOR_XML && regExpTest(/((--!?|])>)|<\/(style|title)/i, value)) { + _removeAttribute(name, currentNode); + continue; + } + + /* Did the hooks approve of the attribute? */ + if (hookEvent.forceKeepAttr) { + continue; + } + + /* Remove attribute */ + _removeAttribute(name, currentNode); + + /* Did the hooks approve of the attribute? */ + if (!hookEvent.keepAttr) { + continue; + } + + /* Work around a security issue in jQuery 3.0 */ + if (!ALLOW_SELF_CLOSE_IN_ATTR && regExpTest(/\/>/i, value)) { + _removeAttribute(name, currentNode); + continue; + } + + /* Sanitize attribute content to be template-safe */ + if (SAFE_FOR_TEMPLATES) { + arrayForEach([MUSTACHE_EXPR, ERB_EXPR, TMPLIT_EXPR], expr => { + value = stringReplace(value, expr, ' '); + }); + } + + /* Is `value` valid for this attribute? */ + const lcTag = transformCaseFunc(currentNode.nodeName); + if (!_isValidAttribute(lcTag, lcName, value)) { + continue; + } + + /* Full DOM Clobbering protection via namespace isolation, + * Prefix id and name attributes with `user-content-` + */ + if (SANITIZE_NAMED_PROPS && (lcName === 'id' || lcName === 'name')) { + // Remove the attribute with this value + _removeAttribute(name, currentNode); + + // Prefix the value and later re-create the attribute with the sanitized value + value = SANITIZE_NAMED_PROPS_PREFIX + value; + } + + /* Handle attributes that require Trusted Types */ + if (trustedTypesPolicy && typeof trustedTypes === 'object' && typeof trustedTypes.getAttributeType === 'function') { + if (namespaceURI) ; else { + switch (trustedTypes.getAttributeType(lcTag, lcName)) { + case 'TrustedHTML': + { + value = trustedTypesPolicy.createHTML(value); + break; + } + case 'TrustedScriptURL': + { + value = trustedTypesPolicy.createScriptURL(value); + break; + } + } + } + } + + /* Handle invalid data-* attribute set by try-catching it */ + try { + if (namespaceURI) { + currentNode.setAttributeNS(namespaceURI, name, value); + } else { + /* Fallback to setAttribute() for browser-unrecognized namespaces e.g. "x-schema". */ + currentNode.setAttribute(name, value); + } + if (_isClobbered(currentNode)) { + _forceRemove(currentNode); + } else { + arrayPop(DOMPurify.removed); + } + } catch (_) {} + } + + /* Execute a hook if present */ + _executeHook('afterSanitizeAttributes', currentNode, null); + }; + + /** + * _sanitizeShadowDOM + * + * @param {DocumentFragment} fragment to iterate over recursively + */ + const _sanitizeShadowDOM = function _sanitizeShadowDOM(fragment) { + let shadowNode = null; + const shadowIterator = _createNodeIterator(fragment); + + /* Execute a hook if present */ + _executeHook('beforeSanitizeShadowDOM', fragment, null); + while (shadowNode = shadowIterator.nextNode()) { + /* Execute a hook if present */ + _executeHook('uponSanitizeShadowNode', shadowNode, null); + + /* Sanitize tags and elements */ + if (_sanitizeElements(shadowNode)) { + continue; + } + + /* Deep shadow DOM detected */ + if (shadowNode.content instanceof DocumentFragment) { + _sanitizeShadowDOM(shadowNode.content); + } + + /* Check attributes, sanitize if necessary */ + _sanitizeAttributes(shadowNode); + } + + /* Execute a hook if present */ + _executeHook('afterSanitizeShadowDOM', fragment, null); + }; + + /** + * Sanitize + * Public method providing core sanitation functionality + * + * @param {String|Node} dirty string or DOM node + * @param {Object} cfg object + */ + // eslint-disable-next-line complexity + DOMPurify.sanitize = function (dirty) { + let cfg = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {}; + let body = null; + let importedNode = null; + let currentNode = null; + let returnNode = null; + /* Make sure we have a string to sanitize. + DO NOT return early, as this will return the wrong type if + the user has requested a DOM object rather than a string */ + IS_EMPTY_INPUT = !dirty; + if (IS_EMPTY_INPUT) { + dirty = ''; + } + + /* Stringify, in case dirty is an object */ + if (typeof dirty !== 'string' && !_isNode(dirty)) { + if (typeof dirty.toString === 'function') { + dirty = dirty.toString(); + if (typeof dirty !== 'string') { + throw typeErrorCreate('dirty is not a string, aborting'); + } + } else { + throw typeErrorCreate('toString is not a function'); + } + } + + /* Return dirty HTML if DOMPurify cannot run */ + if (!DOMPurify.isSupported) { + return dirty; + } + + /* Assign config vars */ + if (!SET_CONFIG) { + _parseConfig(cfg); + } + + /* Clean up removed elements */ + DOMPurify.removed = []; + + /* Check if dirty is correctly typed for IN_PLACE */ + if (typeof dirty === 'string') { + IN_PLACE = false; + } + if (IN_PLACE) { + /* Do some early pre-sanitization to avoid unsafe root nodes */ + if (dirty.nodeName) { + const tagName = transformCaseFunc(dirty.nodeName); + if (!ALLOWED_TAGS[tagName] || FORBID_TAGS[tagName]) { + throw typeErrorCreate('root node is forbidden and cannot be sanitized in-place'); + } + } + } else if (dirty instanceof Node) { + /* If dirty is a DOM element, append to an empty document to avoid + elements being stripped by the parser */ + body = _initDocument(''); + importedNode = body.ownerDocument.importNode(dirty, true); + if (importedNode.nodeType === NODE_TYPE.element && importedNode.nodeName === 'BODY') { + /* Node is already a body, use as is */ + body = importedNode; + } else if (importedNode.nodeName === 'HTML') { + body = importedNode; + } else { + // eslint-disable-next-line unicorn/prefer-dom-node-append + body.appendChild(importedNode); + } + } else { + /* Exit directly if we have nothing to do */ + if (!RETURN_DOM && !SAFE_FOR_TEMPLATES && !WHOLE_DOCUMENT && + // eslint-disable-next-line unicorn/prefer-includes + dirty.indexOf('<') === -1) { + return trustedTypesPolicy && RETURN_TRUSTED_TYPE ? trustedTypesPolicy.createHTML(dirty) : dirty; + } + + /* Initialize the document to work on */ + body = _initDocument(dirty); + + /* Check we have a DOM node from the data */ + if (!body) { + return RETURN_DOM ? null : RETURN_TRUSTED_TYPE ? emptyHTML : ''; + } + } + + /* Remove first element node (ours) if FORCE_BODY is set */ + if (body && FORCE_BODY) { + _forceRemove(body.firstChild); + } + + /* Get node iterator */ + const nodeIterator = _createNodeIterator(IN_PLACE ? dirty : body); + + /* Now start iterating over the created document */ + while (currentNode = nodeIterator.nextNode()) { + /* Sanitize tags and elements */ + if (_sanitizeElements(currentNode)) { + continue; + } + + /* Shadow DOM detected, sanitize it */ + if (currentNode.content instanceof DocumentFragment) { + _sanitizeShadowDOM(currentNode.content); + } + + /* Check attributes, sanitize if necessary */ + _sanitizeAttributes(currentNode); + } + + /* If we sanitized `dirty` in-place, return it. */ + if (IN_PLACE) { + return dirty; + } + + /* Return sanitized string or DOM */ + if (RETURN_DOM) { + if (RETURN_DOM_FRAGMENT) { + returnNode = createDocumentFragment.call(body.ownerDocument); + while (body.firstChild) { + // eslint-disable-next-line unicorn/prefer-dom-node-append + returnNode.appendChild(body.firstChild); + } + } else { + returnNode = body; + } + if (ALLOWED_ATTR.shadowroot || ALLOWED_ATTR.shadowrootmode) { + /* + AdoptNode() is not used because internal state is not reset + (e.g. the past names map of a HTMLFormElement), this is safe + in theory but we would rather not risk another attack vector. + The state that is cloned by importNode() is explicitly defined + by the specs. + */ + returnNode = importNode.call(originalDocument, returnNode, true); + } + return returnNode; + } + let serializedHTML = WHOLE_DOCUMENT ? body.outerHTML : body.innerHTML; + + /* Serialize doctype if allowed */ + if (WHOLE_DOCUMENT && ALLOWED_TAGS['!doctype'] && body.ownerDocument && body.ownerDocument.doctype && body.ownerDocument.doctype.name && regExpTest(DOCTYPE_NAME, body.ownerDocument.doctype.name)) { + serializedHTML = '\n' + serializedHTML; + } + + /* Sanitize final string template-safe */ + if (SAFE_FOR_TEMPLATES) { + arrayForEach([MUSTACHE_EXPR, ERB_EXPR, TMPLIT_EXPR], expr => { + serializedHTML = stringReplace(serializedHTML, expr, ' '); + }); + } + return trustedTypesPolicy && RETURN_TRUSTED_TYPE ? trustedTypesPolicy.createHTML(serializedHTML) : serializedHTML; + }; + + /** + * Public method to set the configuration once + * setConfig + * + * @param {Object} cfg configuration object + */ + DOMPurify.setConfig = function () { + let cfg = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {}; + _parseConfig(cfg); + SET_CONFIG = true; + }; + + /** + * Public method to remove the configuration + * clearConfig + * + */ + DOMPurify.clearConfig = function () { + CONFIG = null; + SET_CONFIG = false; + }; + + /** + * Public method to check if an attribute value is valid. + * Uses last set config, if any. Otherwise, uses config defaults. + * isValidAttribute + * + * @param {String} tag Tag name of containing element. + * @param {String} attr Attribute name. + * @param {String} value Attribute value. + * @return {Boolean} Returns true if `value` is valid. Otherwise, returns false. + */ + DOMPurify.isValidAttribute = function (tag, attr, value) { + /* Initialize shared config vars if necessary. */ + if (!CONFIG) { + _parseConfig({}); + } + const lcTag = transformCaseFunc(tag); + const lcName = transformCaseFunc(attr); + return _isValidAttribute(lcTag, lcName, value); + }; + + /** + * AddHook + * Public method to add DOMPurify hooks + * + * @param {String} entryPoint entry point for the hook to add + * @param {Function} hookFunction function to execute + */ + DOMPurify.addHook = function (entryPoint, hookFunction) { + if (typeof hookFunction !== 'function') { + return; + } + hooks[entryPoint] = hooks[entryPoint] || []; + arrayPush(hooks[entryPoint], hookFunction); + }; + + /** + * RemoveHook + * Public method to remove a DOMPurify hook at a given entryPoint + * (pops it from the stack of hooks if more are present) + * + * @param {String} entryPoint entry point for the hook to remove + * @return {Function} removed(popped) hook + */ + DOMPurify.removeHook = function (entryPoint) { + if (hooks[entryPoint]) { + return arrayPop(hooks[entryPoint]); + } + }; + + /** + * RemoveHooks + * Public method to remove all DOMPurify hooks at a given entryPoint + * + * @param {String} entryPoint entry point for the hooks to remove + */ + DOMPurify.removeHooks = function (entryPoint) { + if (hooks[entryPoint]) { + hooks[entryPoint] = []; + } + }; + + /** + * RemoveAllHooks + * Public method to remove all DOMPurify hooks + */ + DOMPurify.removeAllHooks = function () { + hooks = {}; + }; + return DOMPurify; + } + var purify = createDOMPurify(); + + return purify; + +})); +//# sourceMappingURL=purify.js.map + +// @license-end