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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>JSDoc: Source: svgcanvas/sanitize.js</title> <script src="scripts/prettify/prettify.js"> </script> <script src="scripts/prettify/lang-css.js"> </script>  <link type="text/css" rel="stylesheet" href="styles/prettify-tomorrow.css"> <link type="text/css" rel="stylesheet" href="styles/jsdoc-default.css"> </head> <body> <div id="main"> <h1 class="page-title">Source: svgcanvas/sanitize.js</h1> <section> <article> <pre class="prettyprint source linenums"><code>/** * Tools for SVG sanitization. * @module sanitize * @license MIT * * @copyright 2010 Alexis Deveria, 2010 Jeff Schiller */ import { getReverseNS, NS } from './namespaces.js'; import { getHref, setHref, getUrlFromAttr } from './utilities.js'; const REVERSE_NS = getReverseNS(); // Todo: Split out into core attributes, presentation attributes, etc. so consistent /** * This defines which elements and attributes that we support (or at least * don't remove). * @type {PlainObject} */ /* eslint-disable max-len */ const svgGenericWhiteList = [ 'class', 'id', 'display', 'transform', 'style' ]; const svgWhiteList_ = { // SVG Elements a: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'mask', 'opacity', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'xlink:href', 'xlink:title' ], circle: [ 'clip-path', 'clip-rule', 'cx', 'cy', 'enable-background', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'mask', 'opacity', 'r', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage' ], clipPath: [ 'clipPathUnits' ], defs: [], desc: [], ellipse: [ 'clip-path', 'clip-rule', 'cx', 'cy', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'mask', 'opacity', 'requiredFeatures', 'rx', 'ry', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage' ], feBlend: [ 'in', 'in2' ], feColorMatrix: [ 'in', 'type', 'value', 'result', 'values' ], feComposite: [ 'in', 'operator', 'result', 'in2' ], feFlood: [ 'flood-color', 'in', 'result', 'flood-opacity' ], feGaussianBlur: [ 'color-interpolation-filters', 'in', 'requiredFeatures', 'stdDeviation', 'result' ], feMerge: [], feMergeNode: [ 'in' ], feMorphology: [ 'in', 'operator', 'radius' ], feOffset: [ 'dx', 'in', 'dy', 'result' ], filter: [ 'color-interpolation-filters', 'filterRes', 'filterUnits', 'height', 'primitiveUnits', 'requiredFeatures', 'width', 'x', 'xlink:href', 'y' ], foreignObject: [ 'font-size', 'height', 'opacity', 'requiredFeatures', 'width', 'x', 'y' ], g: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'font-family', 'font-size', 'font-style', 'font-weight', 'text-anchor' ], image: [ 'clip-path', 'clip-rule', 'filter', 'height', 'mask', 'opacity', 'requiredFeatures', 'systemLanguage', 'width', 'x', 'xlink:href', 'xlink:title', 'y' ], line: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'x1', 'x2', 'y1', 'y2' ], linearGradient: [ 'gradientTransform', 'gradientUnits', 'requiredFeatures', 'spreadMethod', 'systemLanguage', 'x1', 'x2', 'xlink:href', 'y1', 'y2' ], marker: [ 'markerHeight', 'markerUnits', 'markerWidth', 'orient', 'preserveAspectRatio', 'refX', 'refY', 'se_type', 'systemLanguage', 'viewBox' ], mask: [ 'height', 'maskContentUnits', 'maskUnits', 'width', 'x', 'y' ], metadata: [ ], path: [ 'clip-path', 'clip-rule', 'd', 'enable-background', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage' ], pattern: [ 'height', 'patternContentUnits', 'patternTransform', 'patternUnits', 'requiredFeatures', 'systemLanguage', 'viewBox', 'width', 'x', 'xlink:href', 'y' ], polygon: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'points', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'sides', 'shape', 'edge', 'point', 'starRadiusMultiplier', 'r', 'radialshift' ], polyline: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'opacity', 'points', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'se:connector' ], radialGradient: [ 'cx', 'cy', 'fx', 'fy', 'gradientTransform', 'gradientUnits', 'r', 'requiredFeatures', 'spreadMethod', 'systemLanguage', 'xlink:href' ], rect: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'height', 'mask', 'opacity', 'requiredFeatures', 'rx', 'ry', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'width', 'x', 'y' ], stop: [ 'offset', 'requiredFeatures', 'stop-opacity', 'systemLanguage', 'stop-color', 'gradientUnits', 'gradientTransform' ], style: [ 'type' ], svg: [ 'clip-path', 'clip-rule', 'enable-background', 'filter', 'height', 'mask', 'preserveAspectRatio', 'requiredFeatures', 'systemLanguage', 'version', 'viewBox', 'width', 'x', 'xmlns', 'xmlns:se', 'xmlns:xlink', 'xmlns:oi', 'oi:animations', 'y', 'stroke-linejoin', 'fill-rule', 'aria-label', 'stroke-width', 'fill-rule', 'xml:space' ], switch: [ 'requiredFeatures', 'systemLanguage' ], symbol: [ 'fill', 'fill-opacity', 'fill-rule', 'filter', 'font-family', 'font-size', 'font-style', 'font-weight', 'opacity', 'overflow', 'preserveAspectRatio', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'viewBox', 'width', 'height' ], text: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'font-family', 'font-size', 'font-style', 'font-weight', 'mask', 'opacity', 'requiredFeatures', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'text-anchor', 'x', 'xml:space', 'y' ], textPath: [ 'method', 'requiredFeatures', 'spacing', 'startOffset', 'systemLanguage', 'xlink:href' ], title: [], tspan: [ 'clip-path', 'clip-rule', 'dx', 'dy', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'font-family', 'font-size', 'font-style', 'font-weight', 'mask', 'opacity', 'requiredFeatures', 'rotate', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'systemLanguage', 'text-anchor', 'textLength', 'x', 'xml:space', 'y' ], use: [ 'clip-path', 'clip-rule', 'fill', 'fill-opacity', 'fill-rule', 'filter', 'height', 'mask', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'width', 'x', 'xlink:href', 'y', 'overflow' ], // MathML Elements annotation: [ 'encoding' ], 'annotation-xml': [ 'encoding' ], maction: [ 'actiontype', 'other', 'selection' ], math: [ 'xmlns' ], menclose: [ 'notation' ], merror: [], mfrac: [ 'linethickness' ], mi: [ 'mathvariant' ], mmultiscripts: [], mn: [], mo: [ 'fence', 'lspace', 'maxsize', 'minsize', 'rspace', 'stretchy' ], mover: [], mpadded: [ 'lspace', 'width', 'height', 'depth', 'voffset' ], mphantom: [], mprescripts: [], mroot: [], mrow: [ 'xlink:href', 'xlink:type', 'xmlns:xlink' ], mspace: [ 'depth', 'height', 'width' ], msqrt: [], mstyle: [ 'displaystyle', 'mathbackground', 'mathcolor', 'mathvariant', 'scriptlevel' ], msub: [], msubsup: [], msup: [], mtable: [ 'align', 'columnalign', 'columnlines', 'columnspacing', 'displaystyle', 'equalcolumns', 'equalrows', 'frame', 'rowalign', 'rowlines', 'rowspacing', 'width' ], mtd: [ 'columnalign', 'columnspan', 'rowalign', 'rowspan' ], mtext: [], mtr: [ 'columnalign', 'rowalign' ], munder: [], munderover: [], none: [], semantics: [] }; /* eslint-enable max-len */ // add generic attributes to all elements of the whitelist Object.keys(svgWhiteList_).forEach((element) => svgWhiteList_[element] = [ ...svgWhiteList_[element], ...svgGenericWhiteList ]); // Produce a Namespace-aware version of svgWhitelist const svgWhiteListNS_ = {}; Object.entries(svgWhiteList_).forEach(([ elt, atts ]) => { const attNS = {}; Object.entries(atts).forEach(function ([ _i, att ]) { if (att.includes(':')) { const v = att.split(':'); attNS[v[1]] = NS[(v[0]).toUpperCase()]; } else { attNS[att] = att === 'xmlns' ? NS.XMLNS : null; } }); svgWhiteListNS_[elt] = attNS; }); /** * Sanitizes the input node and its children. * It only keeps what is allowed from our whitelist defined above. * @function module:sanitize.sanitizeSvg * @param {Text|Element} node - The DOM element to be checked (we'll also check its children) or text node to be cleaned up * @returns {void} */ export const sanitizeSvg = function (node) { // Cleanup text nodes if (node.nodeType === 3) { // 3 === TEXT_NODE // Trim whitespace node.nodeValue = node.nodeValue.trim(); // Remove if empty if (!node.nodeValue.length) { node.remove(); } } // We only care about element nodes. // Automatically return for all non-element nodes, such as comments, etc. if (node.nodeType !== 1) { // 1 == ELEMENT_NODE return; } const doc = node.ownerDocument; const parent = node.parentNode; // can parent ever be null here? I think the root node's parent is the document... if (!doc || !parent) { return; } const allowedAttrs = svgWhiteList_[node.nodeName]; const allowedAttrsNS = svgWhiteListNS_[node.nodeName]; // if this element is supported, sanitize it if (typeof allowedAttrs !== 'undefined') { const seAttrs = []; let i = node.attributes.length; while (i--) { // if the attribute is not in our whitelist, then remove it const attr = node.attributes.item(i); const attrName = attr.nodeName; const attrLocalName = attr.localName; const attrNsURI = attr.namespaceURI; // Check that an attribute with the correct localName in the correct namespace is on // our whitelist or is a namespace declaration for one of our allowed namespaces if ( attrNsURI !== allowedAttrsNS[attrLocalName] && attrNsURI !== NS.XMLNS && !(attrNsURI === NS.XMLNS && REVERSE_NS[attr.value]) ) { // Bypassing the whitelist to allow se: and oi: prefixes // We can add specific namepaces on demand for now. // Is there a more appropriate way to do this? if (attrName.startsWith('se:') || attrName.startsWith('oi:')|| attrName.startsWith('data-')) { seAttrs.push([ attrName, attr.value ]); } else { console.warn(`sanitizeSvg: attribute ${attrName} in element ${node.nodeName} not in whitelist is removed`); node.removeAttributeNS(attrNsURI, attrLocalName); } } // For the style attribute, rewrite it in terms of XML presentational attributes if (attrName === 'style') { const props = attr.value.split(';'); let p = props.length; while (p--) { const [ name, val ] = props[p].split(':'); const styleAttrName = (name || '').trim(); const styleAttrVal = (val || '').trim(); // Now check that this attribute is supported if (allowedAttrs.includes(styleAttrName)) { node.setAttribute(styleAttrName, styleAttrVal); } } node.removeAttribute('style'); } } Object.values(seAttrs).forEach(([ att, val ]) => { node.setAttributeNS(NS.SE, att, val); }); // for some elements that have a xlink:href, ensure the URI refers to a local element // (but not for links) const href = getHref(node); if (href && [ 'filter', 'linearGradient', 'pattern', 'radialGradient', 'textPath', 'use' ].includes(node.nodeName) && href[0] !== '#') { // remove the attribute (but keep the element) setHref(node, ''); console.warn(`sanitizeSvg: attribute href in element ${node.nodeName} pointing to a non-local reference (${href}) is removed`); node.removeAttributeNS(NS.XLINK, 'href'); } // Safari crashes on a <use> without a xlink:href, so we just remove the node here if (node.nodeName === 'use' && !getHref(node)) { console.warn(`sanitizeSvg: element ${node.nodeName} without a xlink:href is removed`); node.remove(); return; } // if the element has attributes pointing to a non-local reference, // need to remove the attribute Object.values([ 'clip-path', 'fill', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'stroke' ], function (attr) { let val = node.getAttribute(attr); if (val) { val = getUrlFromAttr(val); // simply check for first character being a '#' if (val && val[0] !== '#') { node.setAttribute(attr, ''); console.warn(`sanitizeSvg: attribute ${attr} in element ${node.nodeName} pointing to a non-local reference (${val}) is removed`); node.removeAttribute(attr); } } }); // recurse to children i = node.childNodes.length; while (i--) { sanitizeSvg(node.childNodes.item(i)); } // else (element not supported), remove it } else { // remove all children from this node and insert them before this node // TODO: in the case of animation elements this will hardly ever be correct console.warn(`sanitizeSvg: element ${node.nodeName} not supported is removed`); const children = []; while (node.hasChildNodes()) { children.push(parent.insertBefore(node.firstChild, node)); } // remove this node from the document altogether node.remove(); // call sanitizeSvg on each of those children let i = children.length; while (i--) { sanitizeSvg(children[i]); } } }; </code></pre> </article> </section> </div> <nav> <h2><a 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href="tutorial-CanvasAPI.html">CanvasAPI</a></li><li><a href="tutorial-Editor.html">Editor</a></li><li><a href="tutorial-EditorAPI.html">EditorAPI</a></li><li><a href="tutorial-Events.html">Events</a></li><li><a href="tutorial-FrequentlyAskedQuestions.html">Frequently Asked Questions (FAQ)</a></li></ul><h3>Global</h3><ul><li><a href="global.html#attributeChangedCallback">attributeChangedCallback</a></li><li><a href="global.html#connectedCallback">connectedCallback</a></li><li><a href="global.html#constructor">constructor</a></li><li><a href="global.html#expireCookie">expireCookie</a></li><li><a href="global.html#findPos">findPos</a></li><li><a href="global.html#formatValueFormatthenumericvalueasastring.Thisisusedafterincrementing/decrementingthevaluetoreformatthevalueasastring.">formatValue Format the numeric value as a string. This is used after incrementing/decrementing the value to reformat the value as a string.</a></li><li><a href="global.html#get">get</a></li><li><a href="global.html#getClosest">getClosest</a></li><li><a href="global.html#getParents">getParents</a></li><li><a href="global.html#init">init</a></li><li><a href="global.html#inputsize">inputsize</a></li><li><a href="global.html#isNullish">isNullish</a></li><li><a href="global.html#loadloadConfig">load load Config</a></li><li><a href="global.html#loadFromURLLoadconfig/datafromURLifgiven">loadFromURL Load config/data from URL if given</a></li><li><a href="global.html#name">name</a></li><li><a href="global.html#observedAttributes">observedAttributes</a></li><li><a href="global.html#parseValue">parseValue</a></li><li><a href="global.html#pref">pref</a></li><li><a href="global.html#processResults">processResults</a></li><li><a href="global.html#readySignal">readySignal</a></li><li><a href="global.html#regexEscape">regexEscape</a></li><li><a href="global.html#removeStoragePrefCookie">removeStoragePrefCookie</a></li><li><a href="global.html#replaceStoragePrompt">replaceStoragePrompt</a></li><li><a href="global.html#set">set</a></li><li><a href="global.html#setupCurConfig">setupCurConfig</a></li><li><a href="global.html#setupCurPrefs">setupCurPrefs</a></li><li><a href="global.html#src">src</a></li><li><a href="global.html#stateEffects">stateEffects</a></li><li><a href="global.html#stepDown">stepDown</a></li><li><a href="global.html#stepUp">stepUp</a></li><li><a href="global.html#touchHandler">touchHandler</a></li><li><a href="global.html#updateLib">updateLib</a></li><li><a href="global.html#value">value</a></li></ul> </nav> <br class="clear"> <footer> Documentation generated by <a href="https://github.com/jsdoc/jsdoc">JSDoc 3.6.7</a> on Mon Nov 08 2021 09:47:00 GMT+0100 (Central European Standard Time) </footer> <script> prettyPrint(); </script> <script src="scripts/linenumber.js"> </script> </body> </html>