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Original file line number | Diff line number | Diff line change |
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/* | ||
Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
this software and associated documentation files (the "Software"), to | ||
deal in the Software without restriction, including without limitation the | ||
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
sell copies of the Software, and to permit persons to whom the Software is | ||
furnished to do so, subject to the following conditions: | ||
The above copyright notice and this permission notice shall be included in all | ||
copies or substantial portions of the Software. | ||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
SOFTWARE. | ||
*/ | ||
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||
(function () { | ||
'use strict'; | ||
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var tag_whitelist = { | ||
B: true, | ||
BODY: true, | ||
BR: true, | ||
DIV: true, | ||
FONT: true, | ||
I: true, | ||
U: true, | ||
}; | ||
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var attribute_whitelist = { | ||
align: true, | ||
color: true, | ||
face: true, | ||
size: true, | ||
}; | ||
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Sao.HtmlSanitizer = {}; | ||
Sao.HtmlSanitizer.sanitize = function(input) { | ||
input = input.trim(); | ||
// to save performance and not create iframe | ||
if (input == "") return ""; | ||
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// firefox "bogus node" workaround | ||
if (input == "<br>") return ""; | ||
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var iframe = document.createElement('iframe'); | ||
if (iframe.sandbox === undefined) { | ||
// Browser does not support sandboxed iframes | ||
console.warn("Your browser do not support sandboxed iframes," + | ||
" unable to sanitize HTML."); | ||
return input; | ||
} | ||
iframe.sandbox = 'allow-same-origin'; | ||
iframe.style.display = 'none'; | ||
// necessary so the iframe contains a document | ||
document.body.appendChild(iframe); | ||
var iframedoc = (iframe.contentDocument || | ||
iframe.contentWindow.document); | ||
// null in IE | ||
if (iframedoc.body == null) { | ||
iframedoc.write("<body></body>"); | ||
} | ||
iframedoc.body.innerHTML = input; | ||
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function make_sanitized_copy(node) { | ||
var new_node; | ||
if (node.nodeType == Node.TEXT_NODE) { | ||
new_node = node.cloneNode(true); | ||
} else if (node.nodeType == Node.ELEMENT_NODE && | ||
tag_whitelist[node.tagName]) { | ||
//remove useless empty tags | ||
if ((node.tagName != "BR") && node.innerHTML.trim() == "") { | ||
return document.createDocumentFragment(); | ||
} | ||
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new_node = iframedoc.createElement(node.tagName); | ||
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for (var i = 0; i < node.attributes.length; i++) { | ||
var attr = node.attributes[i]; | ||
if (attribute_whitelist[attr.name]) { | ||
new_node.setAttribute(attr.name, attr.value); | ||
} | ||
} | ||
for (i = 0; i < node.childNodes.length; i++) { | ||
var sub_copy = make_sanitized_copy(node.childNodes[i]); | ||
new_node.appendChild(sub_copy, false); | ||
} | ||
} else { | ||
new_node = document.createDocumentFragment(); | ||
} | ||
return new_node; | ||
} | ||
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var result_element = make_sanitized_copy(iframedoc.body); | ||
document.body.removeChild(iframe); | ||
// replace is just for cleaner code | ||
return result_element.innerHTML | ||
.replace(/<br[^>]*>(\S)/g, "<br>\n$1") | ||
.replace(/div><div/g, "div>\n<div"); | ||
}; | ||
})(); |
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