comunic/tools/svgedit/sanitize.js
2016-11-19 12:08:12 +01:00

260 lines
14 KiB
JavaScript
Executable File

/*globals $, svgedit*/
/*jslint vars: true, eqeq: true*/
/**
* Package: svgedit.sanitize
*
* Licensed under the MIT License
*
* Copyright(c) 2010 Alexis Deveria
* Copyright(c) 2010 Jeff Schiller
*/
// Dependencies:
// 1) jQuery
// 2) pathseg.js
// 3) browser.js
// 4) svgutils.js
(function() {'use strict';
if (!svgedit.sanitize) {
svgedit.sanitize = {};
}
var NS = svgedit.NS,
REVERSE_NS = svgedit.getReverseNS();
// this defines which elements and attributes that we support
var svgWhiteList_ = {
// SVG Elements
"a": ["class", "clip-path", "clip-rule", "fill", "fill-opacity", "fill-rule", "filter", "id", "mask", "opacity", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform", "xlink:href", "xlink:title"],
"circle": ["class", "clip-path", "clip-rule", "cx", "cy", "fill", "fill-opacity", "fill-rule", "filter", "id", "mask", "opacity", "r", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform"],
"clipPath": ["class", "clipPathUnits", "id"],
"defs": [],
"style" : ["type"],
"desc": [],
"ellipse": ["class", "clip-path", "clip-rule", "cx", "cy", "fill", "fill-opacity", "fill-rule", "filter", "id", "mask", "opacity", "requiredFeatures", "rx", "ry", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform"],
"feGaussianBlur": ["class", "color-interpolation-filters", "id", "requiredFeatures", "stdDeviation"],
"filter": ["class", "color-interpolation-filters", "filterRes", "filterUnits", "height", "id", "primitiveUnits", "requiredFeatures", "width", "x", "xlink:href", "y"],
"foreignObject": ["class", "font-size", "height", "id", "opacity", "requiredFeatures", "style", "transform", "width", "x", "y"],
"g": ["class", "clip-path", "clip-rule", "id", "display", "fill", "fill-opacity", "fill-rule", "filter", "mask", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform", "font-family", "font-size", "font-style", "font-weight", "text-anchor"],
"image": ["class", "clip-path", "clip-rule", "filter", "height", "id", "mask", "opacity", "requiredFeatures", "style", "systemLanguage", "transform", "width", "x", "xlink:href", "xlink:title", "y"],
"line": ["class", "clip-path", "clip-rule", "fill", "fill-opacity", "fill-rule", "filter", "id", "marker-end", "marker-mid", "marker-start", "mask", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform", "x1", "x2", "y1", "y2"],
"linearGradient": ["class", "id", "gradientTransform", "gradientUnits", "requiredFeatures", "spreadMethod", "systemLanguage", "x1", "x2", "xlink:href", "y1", "y2"],
"marker": ["id", "class", "markerHeight", "markerUnits", "markerWidth", "orient", "preserveAspectRatio", "refX", "refY", "systemLanguage", "viewBox"],
"mask": ["class", "height", "id", "maskContentUnits", "maskUnits", "width", "x", "y"],
"metadata": ["class", "id"],
"path": ["class", "clip-path", "clip-rule", "d", "fill", "fill-opacity", "fill-rule", "filter", "id", "marker-end", "marker-mid", "marker-start", "mask", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform"],
"pattern": ["class", "height", "id", "patternContentUnits", "patternTransform", "patternUnits", "requiredFeatures", "style", "systemLanguage", "viewBox", "width", "x", "xlink:href", "y"],
"polygon": ["class", "clip-path", "clip-rule", "id", "fill", "fill-opacity", "fill-rule", "filter", "id", "class", "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", "style", "systemLanguage", "transform"],
"polyline": ["class", "clip-path", "clip-rule", "id", "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", "style", "systemLanguage", "transform"],
"radialGradient": ["class", "cx", "cy", "fx", "fy", "gradientTransform", "gradientUnits", "id", "r", "requiredFeatures", "spreadMethod", "systemLanguage", "xlink:href"],
"rect": ["class", "clip-path", "clip-rule", "fill", "fill-opacity", "fill-rule", "filter", "height", "id", "mask", "opacity", "requiredFeatures", "rx", "ry", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform", "width", "x", "y"],
"stop": ["class", "id", "offset", "requiredFeatures", "stop-color", "stop-opacity", "style", "systemLanguage"],
"svg": ["class", "clip-path", "clip-rule", "filter", "id", "height", "mask", "preserveAspectRatio", "requiredFeatures", "style", "systemLanguage", "viewBox", "width", "x", "xmlns", "xmlns:se", "xmlns:xlink", "y"],
"switch": ["class", "id", "requiredFeatures", "systemLanguage"],
"symbol": ["class", "fill", "fill-opacity", "fill-rule", "filter", "font-family", "font-size", "font-style", "font-weight", "id", "opacity", "preserveAspectRatio", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "transform", "viewBox"],
"text": ["class", "clip-path", "clip-rule", "fill", "fill-opacity", "fill-rule", "filter", "font-family", "font-size", "font-style", "font-weight", "id", "mask", "opacity", "requiredFeatures", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "text-anchor", "transform", "x", "xml:space", "y"],
"textPath": ["class", "id", "method", "requiredFeatures", "spacing", "startOffset", "style", "systemLanguage", "transform", "xlink:href"],
"title": [],
"tspan": ["class", "clip-path", "clip-rule", "dx", "dy", "fill", "fill-opacity", "fill-rule", "filter", "font-family", "font-size", "font-style", "font-weight", "id", "mask", "opacity", "requiredFeatures", "rotate", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "systemLanguage", "text-anchor", "textLength", "transform", "x", "xml:space", "y"],
"use": ["class", "clip-path", "clip-rule", "fill", "fill-opacity", "fill-rule", "filter", "height", "id", "mask", "stroke", "stroke-dasharray", "stroke-dashoffset", "stroke-linecap", "stroke-linejoin", "stroke-miterlimit", "stroke-opacity", "stroke-width", "style", "transform", "width", "x", "xlink:href", "y"],
// MathML Elements
"annotation": ["encoding"],
"annotation-xml": ["encoding"],
"maction": ["actiontype", "other", "selection"],
"math": ["class", "id", "display", "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": []
};
// Produce a Namespace-aware version of svgWhitelist
var svgWhiteListNS_ = {};
$.each(svgWhiteList_, function(elt, atts){
var attNS = {};
$.each(atts, function(i, att){
if (att.indexOf(':') >= 0) {
var v = att.split(':');
attNS[v[1]] = NS[(v[0]).toUpperCase()];
} else {
attNS[att] = att == 'xmlns' ? NS.XMLNS : null;
}
});
svgWhiteListNS_[elt] = attNS;
});
// Function: svgedit.sanitize.sanitizeSvg
// Sanitizes the input node and its children
// It only keeps what is allowed from our whitelist defined above
//
// Parameters:
// node - The DOM element to be checked (we'll also check its children)
svgedit.sanitize.sanitizeSvg = function(node) {
// Cleanup text nodes
if (node.nodeType == 3) { // 3 == TEXT_NODE
// Trim whitespace
node.nodeValue = node.nodeValue.replace(/^\s+|\s+$/g, '');
// Remove if empty
if (node.nodeValue.length === 0) {
node.parentNode.removeChild(node);
}
}
// 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;
}
var doc = node.ownerDocument;
var parent = node.parentNode;
// can parent ever be null here? I think the root node's parent is the document...
if (!doc || !parent) {
return;
}
var allowedAttrs = svgWhiteList_[node.nodeName];
var allowedAttrsNS = svgWhiteListNS_[node.nodeName];
var i;
// if this element is supported, sanitize it
if (typeof allowedAttrs !== 'undefined') {
var seAttrs = [];
i = node.attributes.length;
while (i--) {
// if the attribute is not in our whitelist, then remove it
// could use jQuery's inArray(), but I don't know if that's any better
var attr = node.attributes.item(i);
var attrName = attr.nodeName;
var attrLocalName = attr.localName;
var 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 (!(allowedAttrsNS.hasOwnProperty(attrLocalName) && attrNsURI == allowedAttrsNS[attrLocalName] && attrNsURI != NS.XMLNS) &&
!(attrNsURI == NS.XMLNS && REVERSE_NS[attr.value]) )
{
// TODO(codedread): Programmatically add the se: attributes to the NS-aware whitelist.
// Bypassing the whitelist to allow se: prefixes.
// Is there a more appropriate way to do this?
if (attrName.indexOf('se:') === 0) {
seAttrs.push([attrName, attr.value]);
}
node.removeAttributeNS(attrNsURI, attrLocalName);
}
// Add spaces before negative signs where necessary
if (svgedit.browser.isGecko()) {
switch (attrName) {
case 'transform':
case 'gradientTransform':
case 'patternTransform':
var val = attr.value.replace(/(\d)-/g, '$1 -');
node.setAttribute(attrName, val);
break;
}
}
// For the style attribute, rewrite it in terms of XML presentational attributes
if (attrName == 'style') {
var props = attr.value.split(';'),
p = props.length;
while (p--) {
var nv = props[p].split(':');
var styleAttrName = $.trim(nv[0]);
var styleAttrVal = $.trim(nv[1]);
// Now check that this attribute is supported
if (allowedAttrs.indexOf(styleAttrName) >= 0) {
node.setAttribute(styleAttrName, styleAttrVal);
}
}
node.removeAttribute('style');
}
}
$.each(seAttrs, function(i, attr) {
node.setAttributeNS(NS.SE, attr[0], attr[1]);
});
// for some elements that have a xlink:href, ensure the URI refers to a local element
// (but not for links)
var href = svgedit.utilities.getHref(node);
if (href &&
['filter', 'linearGradient', 'pattern',
'radialGradient', 'textPath', 'use'].indexOf(node.nodeName) >= 0) {
// TODO: we simply check if the first character is a #, is this bullet-proof?
if (href[0] != '#') {
// remove the attribute (but keep the element)
svgedit.utilities.setHref(node, '');
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' && !svgedit.utilities.getHref(node)) {
parent.removeChild(node);
return;
}
// if the element has attributes pointing to a non-local reference,
// need to remove the attribute
$.each(['clip-path', 'fill', 'filter', 'marker-end', 'marker-mid', 'marker-start', 'mask', 'stroke'], function(i, attr) {
var val = node.getAttribute(attr);
if (val) {
val = svgedit.utilities.getUrlFromAttr(val);
// simply check for first character being a '#'
if (val && val[0] !== '#') {
node.setAttribute(attr, '');
node.removeAttribute(attr);
}
}
});
// recurse to children
i = node.childNodes.length;
while (i--) { svgedit.sanitize.sanitizeSvg(node.childNodes.item(i)); }
}
// else (element not supported), remove it
else {
// remove all children from this node and insert them before this node
// FIXME: in the case of animation elements this will hardly ever be correct
var children = [];
while (node.hasChildNodes()) {
children.push(parent.insertBefore(node.firstChild, node));
}
// remove this node from the document altogether
parent.removeChild(node);
// call sanitizeSvg on each of those children
i = children.length;
while (i--) { svgedit.sanitize.sanitizeSvg(children[i]); }
}
};
}());