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sanitize.js
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sanitize.js
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/**
* Copyright (c) 2010 by Gabriel Birke
*
* 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.
*/
function Sanitize(){
var i, e, options;
options = arguments[0] || {}
this.config = {}
this.config.elements = options.elements ? options.elements : [];
this.config.attributes = options.attributes ? options.attributes : {};
this.config.attributes[Sanitize.ALL] = this.config.attributes[Sanitize.ALL] ? this.config.attributes[Sanitize.ALL] : [];
this.config.allow_comments = options.allow_comments ? options.allow_comments : false;
this.allowed_elements = {};
this.config.protocols = options.protocols ? options.protocols : {};
this.config.add_attributes = options.add_attributes ? options.add_attributes : {};
this.dom = options.dom ? options.dom : document;
for(i=0;i<this.config.elements.length;i++) {
this.allowed_elements[this.config.elements[i]] = true;
}
this.config.remove_element_contents = {};
this.config.remove_all_contents = false;
if(options.remove_contents) {
if(options.remove_contents instanceof Array) {
for(i=0;i<options.remove_contents.length;i++) {
this.config.remove_element_contents[options.remove_contents[i]] = true;
}
}
else {
this.config.remove_all_contents = true;
}
}
this.transformers = options.transformers ? options.transformers : [];
}
Sanitize.REGEX_PROTOCOL = /^([A-Za-z0-9\+\-\.\&\;\*\s]*?)(?:\:|&*0*58|&*x0*3a)/i
Sanitize.RELATIVE = '__relative__'; // emulate Ruby symbol with string constant
Sanitize.prototype.clean_node = function(container) {
var fragment = this.dom.createDocumentFragment();
this.current_element = fragment;
this.whitelist_nodes = [];
/**
* Utility function to check if an element exists in an array
*/
function _array_index(needle, haystack) {
var i;
for(i=0; i < haystack.length; i++) {
if(haystack[i] == needle)
return i;
}
return -1;
}
function _merge_arrays_uniq() {
var result = [];
var uniq_hash = {}
var i,j;
for(i=0;i<arguments.length;i++) {
if(!arguments[i] || !arguments[i].length)
continue;
for(j=0;j<arguments[i].length;j++) {
if(uniq_hash[arguments[i][j]])
continue;
uniq_hash[arguments[i][j]] = true;
result.push(arguments[i][j]);
}
}
return result;
}
/**
* Clean function that checks the different node types and cleans them up accordingly
* @param elem DOM Node to clean
*/
function _clean(elem) {
var clone;
switch(elem.nodeType) {
// Element
case 1:
_clean_element.call(this, elem)
break;
// Text
case 3:
var clone = elem.cloneNode(false);
this.current_element.appendChild(clone);
break;
// Entity-Reference (normally not used)
case 5:
var clone = elem.cloneNode(false);
this.current_element.appendChild(clone);
break;
// Comment
case 8:
if(this.config.allow_comments) {
var clone = elem.cloneNode(false);
this.current_element.appendChild(clone);
}
default:
//console.log("unknown node type", elem.nodeType)
}
}
function _clean_element(elem) {
var i, j, clone, parent_element, name, allowed_attributes, attr, attr_name, attr_node, protocols, del, attr_ok;
var transform = _transform_element.call(this, elem);
elem = transform.node;
name = elem.nodeName.toLowerCase();
// check if element itself is allowed
parent_element = this.current_element;
if(this.allowed_elements[name] || transform.whitelist) {
this.current_element = this.dom.createElement(elem.nodeName);
parent_element.appendChild(this.current_element);
// clean attributes
allowed_attributes = _merge_arrays_uniq(
this.config.attributes[name],
this.config.attributes['__ALL__'],
transform.attr_whitelist
);
for(i=0;i<allowed_attributes.length;i++) {
attr_name = allowed_attributes[i];
attr = elem.attributes[attr_name];
if(attr) {
attr_ok = true;
// Check protocol attributes for valid protocol
if(this.config.protocols[name] && this.config.protocols[name][attr_name]) {
protocols = this.config.protocols[name][attr_name];
del = attr.nodeValue.toLowerCase().match(Sanitize.REGEX_PROTOCOL);
if(del) {
attr_ok = (_array_index(del[1], protocols) != -1);
}
else {
attr_ok = (_array_index(Sanitize.RELATIVE, protocols) != -1);
}
}
if(attr_ok) {
attr_node = document.createAttribute(attr_name);
attr_node.value = attr.nodeValue;
this.current_element.setAttributeNode(attr_node);
}
}
}
// Add attributes
if(this.config.add_attributes[name]) {
for(attr_name in this.config.add_attributes[name]) {
attr_node = document.createAttribute(attr_name);
attr_node.value = this.config.add_attributes[name][attr_name];
this.current_element.setAttributeNode(attr_node);
}
}
} // End checking if element is allowed
// If this node is in the dynamic whitelist array (built at runtime by
// transformers), let it live with all of its attributes intact.
else if(_array_index(elem, this.whitelist_nodes) != -1) {
this.current_element = elem.cloneNode(true);
// Remove child nodes, they will be sanitiazied and added by other code
while(this.current_element.childNodes.length > 0) {
this.current_element.removeChild(this.current_element.firstChild);
}
parent_element.appendChild(this.current_element);
}
// iterate over child nodes
if(!this.config.remove_all_contents && !this.config.remove_element_contents[name]) {
for(i=0;i<elem.childNodes.length;i++) {
_clean.call(this, elem.childNodes[i]);
}
}
// some versions of IE don't support normalize.
if(this.current_element.normalize) {
this.current_element.normalize();
}
this.current_element = parent_element;
} // END clean_element function
function _transform_element(node) {
var output = {
attr_whitelist:[],
node: node,
whitelist: false
}
var i, j, transform;
for(i=0;i<this.transformers.length;i++) {
transform = this.transformers[i]({
allowed_elements: this.allowed_elements,
config: this.config,
node: node,
node_name: node.nodeName.toLowerCase(),
whitelist_nodes: this.whitelist_nodes,
dom: this.dom
});
if(transform == null)
continue;
else if(typeof transform == 'object') {
if(transform.whitelist_nodes && transform.whitelist_nodes instanceof Array) {
for(j=0;j<transform.whitelist_nodes.length;j++) {
if(_array_index(transform.whitelist_nodes[j], this.whitelist_nodes) == -1) {
this.whitelist_nodes.push(transform.whitelist_nodes[j]);
}
}
}
output.whitelist = transform.whitelist ? true : false;
if(transform.attr_whitelist) {
output.attr_whitelist = _merge_arrays_uniq(output.attr_whitelist, transform.attr_whitelist);
}
output.node = transform.node ? transform.node : output.node;
}
else {
throw new Error("transformer output must be an object or null");
}
}
return output;
}
for(i=0;i<container.childNodes.length;i++) {
_clean.call(this, container.childNodes[i]);
}
if(fragment.normalize) {
fragment.normalize();
}
return fragment;
}