forked from developmentseed/openlayers_plus
/
wax.leaf.js
2628 lines (2392 loc) · 79.3 KB
/
wax.leaf.js
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// Copyright (C) 2006 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview
* An HTML sanitizer that can satisfy a variety of security policies.
*
* <p>
* The HTML sanitizer is built around a SAX parser and HTML element and
* attributes schemas.
*
* @author mikesamuel@gmail.com
* @requires html4
* @overrides window
* @provides html, html_sanitize
*/
/**
* @namespace
*/
var html = (function (html4) {
var lcase;
// The below may not be true on browsers in the Turkish locale.
if ('script' === 'SCRIPT'.toLowerCase()) {
lcase = function (s) { return s.toLowerCase(); };
} else {
/**
* {@updoc
* $ lcase('SCRIPT')
* # 'script'
* $ lcase('script')
* # 'script'
* }
*/
lcase = function (s) {
return s.replace(
/[A-Z]/g,
function (ch) {
return String.fromCharCode(ch.charCodeAt(0) | 32);
});
};
}
var ENTITIES = {
lt : '<',
gt : '>',
amp : '&',
nbsp : '\240',
quot : '"',
apos : '\''
};
// Schemes on which to defer to uripolicy. Urls with other schemes are denied
var WHITELISTED_SCHEMES = /^(?:https?|mailto|data)$/i;
var decimalEscapeRe = /^#(\d+)$/;
var hexEscapeRe = /^#x([0-9A-Fa-f]+)$/;
/**
* Decodes an HTML entity.
*
* {@updoc
* $ lookupEntity('lt')
* # '<'
* $ lookupEntity('GT')
* # '>'
* $ lookupEntity('amp')
* # '&'
* $ lookupEntity('nbsp')
* # '\xA0'
* $ lookupEntity('apos')
* # "'"
* $ lookupEntity('quot')
* # '"'
* $ lookupEntity('#xa')
* # '\n'
* $ lookupEntity('#10')
* # '\n'
* $ lookupEntity('#x0a')
* # '\n'
* $ lookupEntity('#010')
* # '\n'
* $ lookupEntity('#x00A')
* # '\n'
* $ lookupEntity('Pi') // Known failure
* # '\u03A0'
* $ lookupEntity('pi') // Known failure
* # '\u03C0'
* }
*
* @param name the content between the '&' and the ';'.
* @return a single unicode code-point as a string.
*/
function lookupEntity(name) {
name = lcase(name); // TODO: π is different from Π
if (ENTITIES.hasOwnProperty(name)) { return ENTITIES[name]; }
var m = name.match(decimalEscapeRe);
if (m) {
return String.fromCharCode(parseInt(m[1], 10));
} else if (!!(m = name.match(hexEscapeRe))) {
return String.fromCharCode(parseInt(m[1], 16));
}
return '';
}
function decodeOneEntity(_, name) {
return lookupEntity(name);
}
var nulRe = /\0/g;
function stripNULs(s) {
return s.replace(nulRe, '');
}
var entityRe = /&(#\d+|#x[0-9A-Fa-f]+|\w+);/g;
/**
* The plain text of a chunk of HTML CDATA which possibly containing.
*
* {@updoc
* $ unescapeEntities('')
* # ''
* $ unescapeEntities('hello World!')
* # 'hello World!'
* $ unescapeEntities('1 < 2 && 4 > 3 ')
* # '1 < 2 && 4 > 3\n'
* $ unescapeEntities('<< <- unfinished entity>')
* # '<< <- unfinished entity>'
* $ unescapeEntities('/foo?bar=baz©=true') // & often unescaped in URLS
* # '/foo?bar=baz©=true'
* $ unescapeEntities('pi=ππ, Pi=Π\u03A0') // FIXME: known failure
* # 'pi=\u03C0\u03c0, Pi=\u03A0\u03A0'
* }
*
* @param s a chunk of HTML CDATA. It must not start or end inside an HTML
* entity.
*/
function unescapeEntities(s) {
return s.replace(entityRe, decodeOneEntity);
}
var ampRe = /&/g;
var looseAmpRe = /&([^a-z#]|#(?:[^0-9x]|x(?:[^0-9a-f]|$)|$)|$)/gi;
var ltRe = /</g;
var gtRe = />/g;
var quotRe = /\"/g;
var eqRe = /\=/g; // Backslash required on JScript.net
/**
* Escapes HTML special characters in attribute values as HTML entities.
*
* {@updoc
* $ escapeAttrib('')
* # ''
* $ escapeAttrib('"<<&==&>>"') // Do not just escape the first occurrence.
* # '"<<&==&>>"'
* $ escapeAttrib('Hello <World>!')
* # 'Hello <World>!'
* }
*/
function escapeAttrib(s) {
// Escaping '=' defangs many UTF-7 and SGML short-tag attacks.
return s.replace(ampRe, '&').replace(ltRe, '<').replace(gtRe, '>')
.replace(quotRe, '"').replace(eqRe, '=');
}
/**
* Escape entities in RCDATA that can be escaped without changing the meaning.
* {@updoc
* $ normalizeRCData('1 < 2 && 3 > 4 && 5 < 7&8')
* # '1 < 2 && 3 > 4 && 5 < 7&8'
* }
*/
function normalizeRCData(rcdata) {
return rcdata
.replace(looseAmpRe, '&$1')
.replace(ltRe, '<')
.replace(gtRe, '>');
}
// TODO(mikesamuel): validate sanitizer regexs against the HTML5 grammar at
// http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html
// http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html
// http://www.whatwg.org/specs/web-apps/current-work/multipage/tokenization.html
// http://www.whatwg.org/specs/web-apps/current-work/multipage/tree-construction.html
/** token definitions. */
var INSIDE_TAG_TOKEN = new RegExp(
// Don't capture space.
'^\\s*(?:'
// Capture an attribute name in group 1, and value in group 3.
// We capture the fact that there was an attribute in group 2, since
// interpreters are inconsistent in whether a group that matches nothing
// is null, undefined, or the empty string.
+ ('(?:'
+ '([a-z][a-z-]*)' // attribute name
+ ('(' // optionally followed
+ '\\s*=\\s*'
+ ('('
// A double quoted string.
+ '\"[^\"]*\"'
// A single quoted string.
+ '|\'[^\']*\''
// The positive lookahead is used to make sure that in
// <foo bar= baz=boo>, the value for bar is blank, not "baz=boo".
+ '|(?=[a-z][a-z-]*\\s*=)'
// An unquoted value that is not an attribute name.
// We know it is not an attribute name because the previous
// zero-width match would've eliminated that possibility.
+ '|[^>\"\'\\s]*'
+ ')'
)
+ ')'
) + '?'
+ ')'
)
// End of tag captured in group 3.
+ '|(\/?>)'
// Don't capture cruft
+ '|[\\s\\S][^a-z\\s>]*)',
'i');
var OUTSIDE_TAG_TOKEN = new RegExp(
'^(?:'
// Entity captured in group 1.
+ '&(\\#[0-9]+|\\#[x][0-9a-f]+|\\w+);'
// Comment, doctypes, and processing instructions not captured.
+ '|<\!--[\\s\\S]*?--\>|<!\\w[^>]*>|<\\?[^>*]*>'
// '/' captured in group 2 for close tags, and name captured in group 3.
+ '|<(\/)?([a-z][a-z0-9]*)'
// Text captured in group 4.
+ '|([^<&>]+)'
// Cruft captured in group 5.
+ '|([<&>]))',
'i');
/**
* Given a SAX-like event handler, produce a function that feeds those
* events and a parameter to the event handler.
*
* The event handler has the form:{@code
* {
* // Name is an upper-case HTML tag name. Attribs is an array of
* // alternating upper-case attribute names, and attribute values. The
* // attribs array is reused by the parser. Param is the value passed to
* // the saxParser.
* startTag: function (name, attribs, param) { ... },
* endTag: function (name, param) { ... },
* pcdata: function (text, param) { ... },
* rcdata: function (text, param) { ... },
* cdata: function (text, param) { ... },
* startDoc: function (param) { ... },
* endDoc: function (param) { ... }
* }}
*
* @param {Object} handler a record containing event handlers.
* @return {Function} that takes a chunk of html and a parameter.
* The parameter is passed on to the handler methods.
*/
function makeSaxParser(handler) {
return function parse(htmlText, param) {
htmlText = String(htmlText);
var htmlLower = null;
var inTag = false; // True iff we're currently processing a tag.
var attribs = []; // Accumulates attribute names and values.
var tagName = void 0; // The name of the tag currently being processed.
var eflags = void 0; // The element flags for the current tag.
var openTag = void 0; // True if the current tag is an open tag.
if (handler.startDoc) { handler.startDoc(param); }
while (htmlText) {
var m = htmlText.match(inTag ? INSIDE_TAG_TOKEN : OUTSIDE_TAG_TOKEN);
htmlText = htmlText.substring(m[0].length);
if (inTag) {
if (m[1]) { // attribute
// setAttribute with uppercase names doesn't work on IE6.
var attribName = lcase(m[1]);
var decodedValue;
if (m[2]) {
var encodedValue = m[3];
switch (encodedValue.charCodeAt(0)) { // Strip quotes
case 34: case 39:
encodedValue = encodedValue.substring(
1, encodedValue.length - 1);
break;
}
decodedValue = unescapeEntities(stripNULs(encodedValue));
} else {
// Use name as value for valueless attribs, so
// <input type=checkbox checked>
// gets attributes ['type', 'checkbox', 'checked', 'checked']
decodedValue = attribName;
}
attribs.push(attribName, decodedValue);
} else if (m[4]) {
if (eflags !== void 0) { // False if not in whitelist.
if (openTag) {
if (handler.startTag) {
handler.startTag(tagName, attribs, param);
}
} else {
if (handler.endTag) {
handler.endTag(tagName, param);
}
}
}
if (openTag
&& (eflags & (html4.eflags.CDATA | html4.eflags.RCDATA))) {
if (htmlLower === null) {
htmlLower = lcase(htmlText);
} else {
htmlLower = htmlLower.substring(
htmlLower.length - htmlText.length);
}
var dataEnd = htmlLower.indexOf('</' + tagName);
if (dataEnd < 0) { dataEnd = htmlText.length; }
if (dataEnd) {
if (eflags & html4.eflags.CDATA) {
if (handler.cdata) {
handler.cdata(htmlText.substring(0, dataEnd), param);
}
} else if (handler.rcdata) {
handler.rcdata(
normalizeRCData(htmlText.substring(0, dataEnd)), param);
}
htmlText = htmlText.substring(dataEnd);
}
}
tagName = eflags = openTag = void 0;
attribs.length = 0;
inTag = false;
}
} else {
if (m[1]) { // Entity
if (handler.pcdata) { handler.pcdata(m[0], param); }
} else if (m[3]) { // Tag
openTag = !m[2];
inTag = true;
tagName = lcase(m[3]);
eflags = html4.ELEMENTS.hasOwnProperty(tagName)
? html4.ELEMENTS[tagName] : void 0;
} else if (m[4]) { // Text
if (handler.pcdata) { handler.pcdata(m[4], param); }
} else if (m[5]) { // Cruft
if (handler.pcdata) {
var ch = m[5];
handler.pcdata(
ch === '<' ? '<' : ch === '>' ? '>' : '&',
param);
}
}
}
}
if (handler.endDoc) { handler.endDoc(param); }
};
}
/**
* Returns a function that strips unsafe tags and attributes from html.
* @param {Function} sanitizeAttributes
* maps from (tagName, attribs[]) to null or a sanitized attribute array.
* The attribs array can be arbitrarily modified, but the same array
* instance is reused, so should not be held.
* @return {Function} from html to sanitized html
*/
function makeHtmlSanitizer(sanitizeAttributes) {
var stack;
var ignoring;
return makeSaxParser({
startDoc: function (_) {
stack = [];
ignoring = false;
},
startTag: function (tagName, attribs, out) {
if (ignoring) { return; }
if (!html4.ELEMENTS.hasOwnProperty(tagName)) { return; }
var eflags = html4.ELEMENTS[tagName];
if (eflags & html4.eflags.FOLDABLE) {
return;
} else if (eflags & html4.eflags.UNSAFE) {
ignoring = !(eflags & html4.eflags.EMPTY);
return;
}
attribs = sanitizeAttributes(tagName, attribs);
// TODO(mikesamuel): relying on sanitizeAttributes not to
// insert unsafe attribute names.
if (attribs) {
if (!(eflags & html4.eflags.EMPTY)) {
stack.push(tagName);
}
out.push('<', tagName);
for (var i = 0, n = attribs.length; i < n; i += 2) {
var attribName = attribs[i],
value = attribs[i + 1];
if (value !== null && value !== void 0) {
out.push(' ', attribName, '="', escapeAttrib(value), '"');
}
}
out.push('>');
}
},
endTag: function (tagName, out) {
if (ignoring) {
ignoring = false;
return;
}
if (!html4.ELEMENTS.hasOwnProperty(tagName)) { return; }
var eflags = html4.ELEMENTS[tagName];
if (!(eflags & (html4.eflags.UNSAFE | html4.eflags.EMPTY
| html4.eflags.FOLDABLE))) {
var index;
if (eflags & html4.eflags.OPTIONAL_ENDTAG) {
for (index = stack.length; --index >= 0;) {
var stackEl = stack[index];
if (stackEl === tagName) { break; }
if (!(html4.ELEMENTS[stackEl]
& html4.eflags.OPTIONAL_ENDTAG)) {
// Don't pop non optional end tags looking for a match.
return;
}
}
} else {
for (index = stack.length; --index >= 0;) {
if (stack[index] === tagName) { break; }
}
}
if (index < 0) { return; } // Not opened.
for (var i = stack.length; --i > index;) {
var stackEl = stack[i];
if (!(html4.ELEMENTS[stackEl]
& html4.eflags.OPTIONAL_ENDTAG)) {
out.push('</', stackEl, '>');
}
}
stack.length = index;
out.push('</', tagName, '>');
}
},
pcdata: function (text, out) {
if (!ignoring) { out.push(text); }
},
rcdata: function (text, out) {
if (!ignoring) { out.push(text); }
},
cdata: function (text, out) {
if (!ignoring) { out.push(text); }
},
endDoc: function (out) {
for (var i = stack.length; --i >= 0;) {
out.push('</', stack[i], '>');
}
stack.length = 0;
}
});
}
// From RFC3986
var URI_SCHEME_RE = new RegExp(
"^" +
"(?:" +
"([^:\/?#]+)" + // scheme
":)?"
);
/**
* Strips unsafe tags and attributes from html.
* @param {string} htmlText to sanitize
* @param {Function} opt_uriPolicy -- a transform to apply to uri/url
* attribute values. If no opt_uriPolicy is provided, no uris
* are allowed ie. the default uriPolicy rewrites all uris to null
* @param {Function} opt_nmTokenPolicy : string -> string? -- a transform to
* apply to names, ids, and classes. If no opt_nmTokenPolicy is provided,
* all names, ids and classes are passed through ie. the default
* nmTokenPolicy is an identity transform
* @return {string} html
*/
function sanitize(htmlText, opt_uriPolicy, opt_nmTokenPolicy) {
var out = [];
makeHtmlSanitizer(
function sanitizeAttribs(tagName, attribs) {
for (var i = 0; i < attribs.length; i += 2) {
var attribName = attribs[i];
var value = attribs[i + 1];
var atype = null, attribKey;
if ((attribKey = tagName + '::' + attribName,
html4.ATTRIBS.hasOwnProperty(attribKey))
|| (attribKey = '*::' + attribName,
html4.ATTRIBS.hasOwnProperty(attribKey))) {
atype = html4.ATTRIBS[attribKey];
}
if (atype !== null) {
switch (atype) {
case html4.atype.NONE: break;
case html4.atype.SCRIPT:
case html4.atype.STYLE:
value = null;
break;
case html4.atype.ID:
case html4.atype.IDREF:
case html4.atype.IDREFS:
case html4.atype.GLOBAL_NAME:
case html4.atype.LOCAL_NAME:
case html4.atype.CLASSES:
value = opt_nmTokenPolicy ? opt_nmTokenPolicy(value) : value;
break;
case html4.atype.URI:
var parsedUri = ('' + value).match(URI_SCHEME_RE);
if (!parsedUri) {
value = null;
} else if (!parsedUri[1] ||
WHITELISTED_SCHEMES.test(parsedUri[1])) {
value = opt_uriPolicy && opt_uriPolicy(value);
} else {
value = null;
}
break;
case html4.atype.URI_FRAGMENT:
if (value && '#' === value.charAt(0)) {
value = opt_nmTokenPolicy ? opt_nmTokenPolicy(value) : value;
if (value) { value = '#' + value; }
} else {
value = null;
}
break;
default:
value = null;
break;
}
} else {
value = null;
}
attribs[i + 1] = value;
}
return attribs;
})(htmlText, out);
return out.join('');
}
return {
escapeAttrib: escapeAttrib,
makeHtmlSanitizer: makeHtmlSanitizer,
makeSaxParser: makeSaxParser,
normalizeRCData: normalizeRCData,
sanitize: sanitize,
unescapeEntities: unescapeEntities
};
})(html4);
var html_sanitize = html.sanitize;
// Exports for closure compiler. Note this file is also cajoled
// for domado and run in an environment without 'window'
if (typeof window !== 'undefined') {
window['html'] = html;
window['html_sanitize'] = html_sanitize;
}
// Loosen restrictions of Caja's
// html-sanitizer to allow for styling
html4.ATTRIBS['*::style'] = 0;
html4.ELEMENTS['style'] = 0;
/*
mustache.js — Logic-less templates in JavaScript
See http://mustache.github.com/ for more info.
*/
var Mustache = function() {
var regexCache = {};
var Renderer = function() {};
Renderer.prototype = {
otag: "{{",
ctag: "}}",
pragmas: {},
buffer: [],
pragmas_implemented: {
"IMPLICIT-ITERATOR": true
},
context: {},
render: function(template, context, partials, in_recursion) {
// reset buffer & set context
if(!in_recursion) {