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/*! | ||
* resanitize - Regular expression-based HTML sanitizer and ad remover, geared toward RSS feed descriptions | ||
* Copyright(c) 2012 Dan MacTough <danmactough@gmail.com> | ||
* All rights reserved. | ||
*/ | ||
|
||
/** | ||
* Dependencies | ||
*/ | ||
var validator = require('validator'); | ||
/** | ||
* Remove unsafe parts and ads from HTML | ||
* | ||
* Example: | ||
* | ||
* var resanitize = require('resanitize'); | ||
* resanitize('<div style="border: 400px solid pink;">Headline</div>'); | ||
* // => '<div>Headline</div>' | ||
* | ||
* References: | ||
* - http://en.wikipedia.org/wiki/C0_and_C1_control_codes | ||
* - http://en.wikipedia.org/wiki/Unicode_control_characters | ||
* - http://www.utf8-chartable.de/unicode-utf8-table.pl | ||
* | ||
* @param {String|Buffer} HTML string to sanitize | ||
* @return {String} sanitized HTML | ||
* @api public | ||
*/ | ||
function resanitize (str) { | ||
if ('string' !== typeof str) { | ||
if (Buffer.isBuffer(str)) { | ||
str = str.toString(); | ||
} | ||
else { | ||
throw new TypeError('Invalid argument: must be String or Buffer'); | ||
} | ||
} | ||
str = stripAsciiCtrlChars(str); | ||
str = stripExtendedCtrlChars(str); | ||
str = fixSpace(str); | ||
str = stripComments(str); | ||
str = stripAds(str); // It's important that this comes before the remainder | ||
// because it matches on certain attribute values that | ||
// get stripped below. | ||
str = validator.sanitize(str).xss().replace(/\[removed\]/g, '') | ||
str = fixImages(str); | ||
str = stripUnsafeTags(str); | ||
str = stripUnsafeAttrs(str); | ||
return str; | ||
} | ||
module.exports = resanitize; | ||
|
||
/** | ||
* Replace UTF-8 non-breaking space with a regular space and strip null bytes | ||
*/ | ||
function fixSpace (str) { | ||
return str.replace(/\u00A0/g, ' ') // Unicode non-breaking space | ||
.replace(/[\u2028\u2029]/g, '') // UCS newline characters | ||
.replace(/\0/g, ''); | ||
} | ||
module.exports.fixSpace = fixSpace; | ||
|
||
/** | ||
* Strip superfluous whitespace | ||
*/ | ||
function stripHtmlExtraSpace (str) { | ||
return str.replace(/<(div|p)[^>]*?>\s*?(?:<br[^>]*?>)*?\s*?<\/\1>/gi, '') | ||
.replace(/<(div|span)[^>]*?>\s*?<\/\1>/gi, ''); | ||
} | ||
module.exports.stripHtmlExtraSpace = stripHtmlExtraSpace; | ||
|
||
/** | ||
* Strip ASCII control characters | ||
*/ | ||
function stripAsciiCtrlChars (str) { | ||
return str.replace(/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/g, ''); | ||
} | ||
module.exports.stripAsciiCtrlChars = stripAsciiCtrlChars; | ||
|
||
/** | ||
* Strip ISO 6429 control characters | ||
*/ | ||
function stripExtendedCtrlChars (str) { | ||
return str.replace(/[\u0080-\u009F]+/g, ''); | ||
} | ||
module.exports.stripExtendedCtrlChars = stripExtendedCtrlChars; | ||
|
||
/** | ||
* Strip HTML comments | ||
*/ | ||
function stripComments (str) { | ||
return str.replace(/<!--[^>]*?-->/g, ''); | ||
} | ||
module.exports.stripComments = stripComments; | ||
|
||
/** | ||
* Permit only the provided attributes to remain in the tag | ||
*/ | ||
function filterAttrs () { | ||
var allowed = []; | ||
|
||
if (Array.isArray(arguments[0])) { | ||
allowed = arguments[0]; | ||
} else { | ||
allowed = Array.prototype.slice.call(arguments); | ||
} | ||
return function (attr, name) { | ||
if ( ~allowed.indexOf(name && name.toLowerCase()) ) { | ||
return attr; | ||
} else { | ||
return ''; | ||
} | ||
}; | ||
} | ||
module.exports.filterAttrs = filterAttrs; | ||
|
||
/** | ||
* Strip the provided attributes from the tag | ||
*/ | ||
function stripAttrs () { | ||
var banned = [] | ||
, regexes = []; | ||
|
||
if (Array.isArray(arguments[0])) { | ||
banned = arguments[0].filter(function (attr) { | ||
if ('string' === typeof attr) { | ||
return true; | ||
} | ||
else if (attr.constructor && 'RegExp' === attr.constructor.name) { | ||
regexes.push(attr); | ||
} | ||
}); | ||
} else { | ||
banned = Array.prototype.slice.call(arguments).filter(function (attr) { | ||
if ('string' === typeof attr) { | ||
return true; | ||
} | ||
else if (attr.constructor && 'RegExp' === attr.constructor.name) { | ||
regexes.push(attr); | ||
} | ||
}); | ||
} | ||
return function (attr, name) { | ||
if ( ~banned.indexOf(name && name.toLowerCase()) || regexes.some(function (re) { return re.test(name); }) ) { | ||
return ''; | ||
} else { | ||
return attr; | ||
} | ||
}; | ||
} | ||
module.exports.stripAttrs = stripAttrs; | ||
|
||
/** | ||
* Filter an HTML opening or self-closing tag | ||
*/ | ||
function filterTag (nextFilter) { | ||
return function (rematch) { | ||
if ('function' === typeof nextFilter) { | ||
rematch = rematch.replace(/([^\s"']+?)=("|')[^>]+?\2/g, nextFilter); | ||
} | ||
// Cleanup extra whitespace | ||
return rematch.replace(/\s+/g, ' ') | ||
.replace(/ (\/)?>/, '$1>'); | ||
}; | ||
} | ||
module.exports.filterTag = filterTag; | ||
|
||
function fixImages (str) { | ||
return str.replace(/(<img[^>]*?>)/g, filterTag(filterAttrs('src', 'alt', 'title', 'height', 'width')) ); | ||
} | ||
module.exports.fixImages = fixImages; | ||
|
||
function stripUnsafeAttrs (str) { | ||
var unsafe = [ 'id' | ||
, 'class' | ||
, 'style' | ||
, 'accesskey' | ||
, 'action' | ||
, 'autocomplete' | ||
, 'autofocus' | ||
, 'clear' | ||
, 'contextmenu' | ||
, 'contenteditable' | ||
, 'draggable' | ||
, 'dropzone' | ||
, 'method' | ||
, 'tabindex' | ||
, 'target' | ||
, /on\w+/i | ||
, /data-\w+/i | ||
]; | ||
return str.replace(/<([^ >]+?) [^>]*?>/g, filterTag(stripAttrs(unsafe))); | ||
} | ||
module.exports.stripUnsafeAttrs = stripUnsafeAttrs; | ||
|
||
function stripUnsafeTags (str) { | ||
var el = /<(?:form|input|font|blink|script|style|comment|plaintext|xmp|link|listing|meta|body|frame|frameset)\b/; | ||
var ct = 0, max = 2; | ||
|
||
// We'll repeatedly try to strip any maliciously nested elements up to [max] times | ||
while (el.test(str) && ct++ < max) { | ||
str = str.replace(/<form[^>]*?>[\s\S]*?<\/form>/gi, '') | ||
.replace(/<input[^>]*?>[\s\S]*?<\/input>/gi, '') | ||
.replace(/<\/?(?:form|input|font|blink)[^>]*?>/gi, '') | ||
// These are XSS/security risks | ||
.replace(/<script[^>]*?>[\s\S]*?<\/script>/gi, '') | ||
.replace(/<style[^>]*?>[\s\S]*?<\/style>/gi, '') // shouldn't work anyway... | ||
.replace(/<comment[^>]*?>[\s\S]*?<\/comment>/gi, '') | ||
.replace(/<plaintext[^>]*?>[\s\S]*?<\/plaintext>/gi, '') | ||
.replace(/<xmp[^>]*?>[\s\S]*?<\/xmp>/gi, '') | ||
.replace(/<\/?(?:link|listing|meta|body|frame|frameset)[^>]*?>/gi, '') | ||
// Delete iframes, except those inserted by Google in lieu of video embeds | ||
.replace(/<iframe(?![^>]*?src=("|')\S+?reader.googleusercontent.com\/reader\/embediframe.+?\1)[^>]*?>[\s\S]*?<\/iframe>/gi, '') | ||
; | ||
} | ||
if (el.test(str)) { | ||
// We couldn't safely strip the HTML, so we return an empty string | ||
return ''; | ||
} | ||
return str; | ||
} | ||
module.exports.stripUnsafeTags = stripUnsafeTags; | ||
|
||
function stripAds (str) { | ||
return str.replace(/<div[^>]*?class=("|')snap_preview\1[^>]*?>(?:<br[^>]*?>)?([\s\S]*?)<\/div>/gi, '$2') | ||
.replace(/<div[^>]*?class=("|')(?:feedflare|zemanta-pixie)\1[^>]*?>[\s\S]*?<\/div>/gi, '') | ||
.replace(/<!--AD BEGIN-->[\s\S]*?<!--AD END-->\s*/gi, '') | ||
.replace(/<table[^>]*?>[\s\S]*?<\/table>\s*?<div[^>]*?>[\s\S]*?Ads by Pheedo[\s\S]*?<\/div>/gi, '') | ||
.replace(/<table[^>]*?>.*?<img[^>]*?src=("|')[^>]*?advertisement[^>]*?\1.*?>.*?<\/table>/gi, '') | ||
.replace(/<br[^>]*?>\s*?<br[^>]*?>\s*?<span[^>]*?class=("|')advertisement\1[^>]*?>[\s\S]*?<\/span>[\s\S]*<div[^>]*?>[\s\S]*?Ads by Pheedo[\s\S]*?<\/div>/gi, '') | ||
.replace(/<br[^>]*?>\s*?<br[^>]*?>\s*?(?:<[^>]+>\s*)*?<hr[^>]*?>\s*?<div[^>]*?>(?:Featured Advertiser|Presented By:)<\/div>[\s\S]*<div[^>]*?>[\s\S]*?(?:Ads by Pheedo|ads\.pheedo\.com)[\s\S]*?<\/div>/gi, '') | ||
.replace(/<br[^>]*?>\s*?<br[^>]*?>\s*?<a[^>]*?href=("|')http:\/\/[^>]*?\.?(?:pheedo|pheedcontent)\.com\/[^>]*?\1[\s\S]*?<\/a>[\s\S]*$/gim, '') | ||
.replace(/<div[^>]*?class=("|')cbw snap_nopreview\1[^>]*?>[\s\S]*$/gim, '') | ||
.replace(/<div><a href=(?:"|')http:\/\/d\.techcrunch\.com\/ck\.php[\s\S]*?<\/div> */gi, '') | ||
.replace(/<(p|div)[^>]*?>\s*?<a[^>]*?href=("|')[^>]+?\2[^>]*?><img[^>]*?src=("|')http:\/\/(?:feedads\.googleadservices|feedproxy\.google|feeds2?\.feedburner)\.com\/(?:~|%7e)[^>]*?\/[^>]+?\3[^>]*?>[\s\S]*?<\/\1>/gi, '') | ||
.replace(/<(p|div)[^>]*?>\s*?<a[^>]*?href=("|')[^>]+?\2[^>]*?><img[^>]*?src=("|')http:\/\/feeds\.[^>]+?\.[^>]+?\/(?:~|%7e)[^>]\/[^>]+?\3[^>]*?>[\s\S]*?<\/\1>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/feeds\.[^>]+?\.[^>]+?\/(?:~|%7e)[a-qs-z]\/[^>]+?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/[^>]*?\.?addtoany\.com\/[^>]*?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/feeds\.wordpress\.com\/[\.\d]+?\/(?:comments|go[\s\S]*)\/[^>]+?\1[\s\S]*?<\/a> ?/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/[^>]*?\.?doubleclick\.net\/[^>]*?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/[^>]*?\.?fmpub\.net\/adserver\/[^>]*?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/[^>]*?\.?eyewonderlabs\.com\/[^>]*?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/[^>]*?\.?pheedo\.com\/[^>]*?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<a[^>]*?href=("|')http:\/\/api\.tweetmeme\.com\/share\?[^>]*?\1[\s\S]*?<\/a>/gi, '') | ||
.replace(/<p><a[^>]*?href=("|')http:\/\/rss\.cnn\.com\/+?(?:~|%7e)a\/[^>]*?\1[\s\S]*?<\/p>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/feeds\.[^>]+?\.[^>]+?\/(?:~|%7e)r\/[^>]+?\1[\s\S]*?>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/rss\.nytimes\.com\/c\/[^>]*?\1.*?>.*$/gim, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/feeds\.washingtonpost\.com\/c\/[^>]*?\1.*?>.*$/gim, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/[^>]*?\.?feedsportal\.com\/c\/[^>]*?\1.*?>.*$/gim, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/(?:feedads\.googleadservices|feedproxy\.google|feeds2\.feedburner)\.com\/(?:~|%7e)r\/[^>]+?\1[\s\S]*?>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/rss\.cnn\.com\/~r\/[^>]*?\1[\s\S]*?>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/[^>]*?\.?fmpub\.net\/adserver\/[^>]*?\1[\s\S]*?>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/[^>]*?\.?pheedo\.com\/[^>]*?\1[\s\S]*?>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/stats\.wordpress\.com\/[\w]\.gif\?[^>]*?\1[\s\S]*?>/gi, '') | ||
.replace(/<img[^>]*?src=("|')http:\/\/feeds\.wired\.com\/c\/[^>]*?\1.*?>.*$/gim, '') | ||
.replace(/<p><strong><em>Crunch Network[\s\S]*?<\/p>/gi, '') | ||
.replace(/<embed[^>]*?castfire_player[\s\S]*?> *?(<\/embed>)?/gi, '') | ||
.replace(/<embed[^>]*?src=("|')[^>]*?castfire\.com[^>]+?\1[\s\S]*?> *?(<\/embed>)?/gi, '') | ||
.replace(/<p align=("|')right\1><em>Sponsor<\/em>[\s\S]*?<\/p>/gi, '') | ||
.replace(/<div [\s\S]*?<img [^>]*?src=(?:"|')[^>]*?\/share-buttons\/[\s\S]*?<\/div>[\s]*/gi, '') | ||
// This is that annoying footer in every delicious item | ||
.replace(/<span[^>]*?>\s*?<a[^>]*?href=("|')[^\1]+?src=feed_newsgator\1[^>]*?>[\s\S]*<\/span>/gi, '') | ||
// This is the annoying footer from ATL | ||
.replace(/<p[^>]*?><strong><a[^>]*?href=("|')[^>]*?abovethelaw\.com\/[\s\S]+?\1[^>]*?>Continue reading[\s\S]*<\/p>/gi, '') | ||
// This is the annoying link at the end of WaPo articles | ||
.replace(/<a[^>]*?>Read full article[\s\S]*?<\/a>/gi, '') | ||
// These ads go... | ||
.replace(/<div[^>]*?><a[^>]*?href=("|')[^>]*?crunchbase\.com\/company\/[\s\S]+?\1[^>]*?>[\s\S]*?<div[\s\S]*?>Loading information about[\s\S]*?<\/div>/gi, '') | ||
.replace(/<div[^>]*?class=("|')cb_widget_[^>]+?\1[\s\S]*?><\/div>/gi, '') | ||
.replace(/<div[^>]*?class=("|')cb_widget_[^>]+?\1[\s\S]*?>[\s\S]*?<\/div>/gi, '') | ||
// Before these | ||
.replace(/<a[^>]*?href=("|')[^>]*?crunchbase\.com\/\1[\s\S]*?<\/a>\s*/gi, '') | ||
.replace(/<div[^>]*?class=("|')cb_widget\1[^>]*?>[\s\S]*?<\/div>/gi, '') | ||
// Clean up some empty things | ||
//.replace(/<(div|p|span)[^>]*?>(\s|<br *?\/?>|(?R))*?<\/\1>/gi, '') | ||
.replace(/(\s|<br[^>]*?\/?>)*$/gim, '') | ||
; | ||
} | ||
module.exports.stripAds = stripAds; | ||
|
||
/** | ||
* Dumbly strip angle brackets | ||
*/ | ||
function stripHtml (str) { | ||
return str.replace(/<.*?>/g, ''); | ||
} | ||
module.exports.stripHtml = stripHtml; |