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/*******************************************************************************
µMatrix - a Chromium browser extension to black/white list requests. Copyright (C) 2014 Raymond Hill
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uMatrix
*/
/* global chrome, µMatrix */
/******************************************************************************/
// Start isolation from global scope
µMatrix.webRequest = (function() {
/******************************************************************************/
// The `id='uMatrix'` is important, it allows µMatrix to detect whether a
// specific data URI originates from itself.
var rootFrameReplacement = [ '<!DOCTYPE html><html id="uMatrix">', '<head>', '<meta charset="utf-8" />', '<style>', '@font-face {', 'font-family:httpsb;', 'font-style:normal;', 'font-weight:400;', 'src: local("httpsb"),url("', µMatrix.fontCSSURL, '") format("truetype");', '}', 'body {', 'margin:0;', 'border:0;', 'padding:0;', 'font:15px httpsb,sans-serif;', 'width:100%;', 'height:100%;', 'background-color:transparent;', 'background-size:10px 10px;', 'background-image:', 'repeating-linear-gradient(', '-45deg,', 'rgba(204,0,0,0.5),rgba(204,0,0,0.5) 24%,', 'transparent 26%,transparent 49%,', 'rgba(204,0,0,0.5) 51%,rgba(204,0,0,0.5) 74%,', 'transparent 76%,transparent', ');', 'text-align: center;', '}', '#p {', 'margin:8px;', 'padding:4px;', 'display:inline-block;', 'background-color:white;', '}', '#t {', 'margin:2px;', 'border:0;', 'padding:0 2px;', 'display:inline-block;', '}', '#t b {', 'padding:0 4px;', 'background-color:#eee;', 'font-weight:normal;', '}', '</style>', '<link href="{{cssURL}}?url={{originalURL}}&hostname={{hostname}}&t={{now}}" rel="stylesheet" type="text/css">', '<title>Blocked by μMatrix</title>', '</head>', '<body>', '<div id="p">', '<div id="t"><b>{{hostname}}</b> blocked by μMatrix</div>', '</div>', '</body>', '</html>'].join('');
var subFrameReplacement = [ '<!DOCTYPE html>', '<html>', '<head>', '<meta charset="utf-8" />', '<style>', '@font-face{', 'font-family:httpsb;', 'font-style:normal;', 'font-weight:400;', 'src:local("httpsb"),url("', µMatrix.fontCSSURL, '") format("truetype");', '}', 'body{', 'margin:0;', 'border:0;', 'padding:0;', 'font:13px httpsb,sans-serif;', '}', '#bg{', 'border:1px dotted {{subframeColor}};', 'position:absolute;', 'top:0;', 'right:0;', 'bottom:0;', 'left:0;', 'background-color:transparent;', 'background-size:10px 10px;', 'background-image:', 'repeating-linear-gradient(', '-45deg,', '{{subframeColor}},{{subframeColor}} 24%,', 'transparent 25%,transparent 49%,', '{{subframeColor}} 50%,{{subframeColor}} 74%,', 'transparent 75%,transparent', ');', 'opacity:{{subframeOpacity}};', 'text-align:center;', '}', '#bg > div{', 'display:inline-block;', 'background-color:rgba(255,255,255,1);', '}', '#bg > div > a {', 'padding:0 2px;', 'display:inline-block;', 'color:white;', 'background-color:{{subframeColor}};', 'text-decoration:none;', '}', '</style>', '<title>Blocked by μMatrix</title>', '</head>', '<body title="“{{hostname}}” frame\nblocked by μMatrix">', '<div id="bg"><div><a href="{{frameSrc}}" target="_blank">{{hostname}}</a></div></div>', '</body>', '</html>'].join('');
/******************************************************************************/
// If it is HTTP Switchboard's root frame replacement URL, verify that
// the page that was blacklisted is still blacklisted, and if not,
// redirect to the previously blacklisted page.
var onBeforeChromeExtensionRequestHandler = function(details) { var requestURL = details.url;
// console.debug('onBeforeChromeExtensionRequestHandler()> "%s": %o', details.url, details);
// rhill 2013-12-10: Avoid regex whenever a faster indexOf() can be used:
// here we can use fast indexOf() as a first filter -- which is executed
// for every single request (so speed matters).
var matches = requestURL.match(/url=([^&]+)&hostname=([^&]+)/); if ( !matches ) { return; }
var µm = µMatrix; var pageURL = decodeURIComponent(matches[1]); var pageHostname = decodeURIComponent(matches[2]);
// Blacklisted as per matrix?
if ( µm.mustBlock(µm.scopeFromURL(pageURL), pageHostname, 'doc') ) { return; }
µMatrix.asyncJobs.add( 'gotoURL-' + details.tabId, { tabId: details.tabId, url: pageURL }, µm.utils.gotoURL, 200, false );};
/******************************************************************************/
// Intercept and filter web requests according to white and black lists.
var onBeforeRootFrameRequestHandler = function(details) { var µm = µMatrix;
// Do not ignore traffic outside tabs
var tabId = details.tabId; if ( tabId < 0 ) { tabId = µm.behindTheSceneTabId; } // It's a root frame, bind to a new page store
else { µm.bindTabToPageStats(tabId, details.url); }
var uri = µm.URI.set(details.url); if ( uri.scheme.indexOf('http') === -1 ) { return; }
var requestURL = uri.normalizedURI(); var requestHostname = uri.hostname; var pageStore = µm.pageStatsFromTabId(tabId);
// Disallow request as per matrix?
var block = µm.mustBlock(pageStore.pageHostname, requestHostname, 'doc');
// console.debug('onBeforeRequestHandler()> block=%s "%s": %o', block, details.url, details);
// whitelisted?
if ( !block ) { // rhill 2013-11-07: Senseless to do this for behind-the-scene requests.
// rhill 2013-12-03: Do this here only for root frames.
if ( tabId !== µm.behindTheSceneTabId ) { µm.cookieHunter.recordPageCookies(pageStore); } return; }
// blacklisted
// rhill 2014-01-15: Delay logging of non-blocked top `main_frame`
// requests, in order to ensure any potential redirects is reported
// in proper chronological order.
// https://github.com/gorhill/httpswitchboard/issues/112
pageStore.recordRequest('doc', requestURL, block);
// If it's a blacklisted frame, redirect to frame.html
// rhill 2013-11-05: The root frame contains a link to noop.css, this
// allows to later check whether the root frame has been unblocked by the
// user, in which case we are able to force a reload using a redirect.
var html = rootFrameReplacement; html = html.replace('{{cssURL}}', µm.noopCSSURL); html = html.replace(/{{hostname}}/g, encodeURIComponent(requestHostname)); html = html.replace('{{originalURL}}', encodeURIComponent(requestURL)); html = html.replace('{{now}}', String(Date.now())); var dataURI = 'data:text/html;base64,' + btoa(html);
return { 'redirectUrl': dataURI };};
/******************************************************************************/
// Intercept and filter web requests according to white and black lists.
var onBeforeRequestHandler = function(details) { var µm = µMatrix; var µmuri = µm.URI.set(details.url); var requestScheme = µmuri.scheme;
// rhill 2014-02-17: Ignore 'filesystem:': this can happen when listening
// to 'chrome-extension://'.
if ( requestScheme === 'filesystem' ) { return; }
// console.debug('onBeforeRequestHandler()> "%s": %o', details.url, details);
var requestType = requestTypeNormalizer[details.type];
// https://github.com/gorhill/httpswitchboard/issues/303
// Wherever the main doc comes from, create a receiver page URL: synthetize
// one if needed.
if ( requestType === 'doc' && details.parentFrameId < 0 ) { return onBeforeRootFrameRequestHandler(details); }
var requestURL = details.url;
// Is it µMatrix's noop css file?
if ( requestType === 'css' && requestURL.slice(0, µm.noopCSSURL.length) === µm.noopCSSURL ) { return onBeforeChromeExtensionRequestHandler(details); }
// Ignore non-http schemes
if ( requestScheme.indexOf('http') !== 0 ) { return; }
// Do not block myself from updating assets
// https://github.com/gorhill/httpswitchboard/issues/202
if ( requestType === 'xhr' && requestURL.slice(0, µm.projectServerRoot.length) === µm.projectServerRoot ) { return; }
var requestHostname = µmuri.hostname;
// rhill 2013-12-15:
// Try to transpose generic `other` category into something more
// meaningful.
if ( requestType === 'other' ) { requestType = µm.transposeType(requestType, µmuri.path); }
// Re-classify orphan HTTP requests as behind-the-scene requests. There is
// not much else which can be done, because there are URLs
// which cannot be handled by µMatrix, i.e. `opera://startpage`,
// as this would lead to complications with no obvious solution, like how
// to scope on unknown scheme? Etc.
// https://github.com/gorhill/httpswitchboard/issues/191
// https://github.com/gorhill/httpswitchboard/issues/91#issuecomment-37180275
var pageStore = µm.pageStatsFromTabId(details.tabId); if ( !pageStore ) { pageStore = µm.pageStatsFromTabId(µm.behindTheSceneTabId); }
// Disallow request as per temporary matrix?
var block = µm.mustBlock(pageStore.pageHostname, requestHostname, requestType);
// Record request.
// https://github.com/gorhill/httpswitchboard/issues/342
// The way requests are handled now, it may happen at this point some
// processing has already been performed, and that a synthetic URL has
// been constructed for logging purpose. Use this synthetic URL if
// it is available.
pageStore.recordRequest(requestType, requestURL, block);
// whitelisted?
if ( !block ) { // console.debug('onBeforeRequestHandler()> ALLOW "%s": %o', details.url, details);
return; }
// blacklisted
// console.debug('onBeforeRequestHandler()> BLOCK "%s": %o', details.url, details);
// If it's a blacklisted frame, redirect to frame.html
// rhill 2013-11-05: The root frame contains a link to noop.css, this
// allows to later check whether the root frame has been unblocked by the
// user, in which case we are able to force a reload using a redirect.
if ( requestType === 'frame' ) { var html = subFrameReplacement .replace(/{{hostname}}/g, requestHostname) .replace('{{frameSrc}}', requestURL) .replace(/{{subframeColor}}/g, µm.userSettings.subframeColor) .replace('{{subframeOpacity}}', (µm.userSettings.subframeOpacity / 100).toFixed(1)); return { 'redirectUrl': 'data:text/html,' + encodeURIComponent(html) }; }
return { 'cancel': true };};
/******************************************************************************/
// This is where tabless requests are processed, as here there may be a chance
// we can bind a request to a specific tab, as headers may contain useful
// information to accomplish this.
//
// Also we sanitize outgoing headers as per user settings.
var onBeforeSendHeadersHandler = function(details) {
var µm = µMatrix;
// console.debug('onBeforeSendHeadersHandler()> "%s": %o', details.url, details);
// Re-classify orphan HTTP requests as behind-the-scene requests. There is
// not much else which can be done, because there are URLs
// which cannot be handled by HTTP Switchboard, i.e. `opera://startpage`,
// as this would lead to complications with no obvious solution, like how
// to scope on unknown scheme? Etc.
// https://github.com/gorhill/httpswitchboard/issues/191
// https://github.com/gorhill/httpswitchboard/issues/91#issuecomment-37180275
var tabId = details.tabId; var pageStore = µm.pageStatsFromTabId(tabId); if ( !pageStore ) { tabId = µm.behindTheSceneTabId; pageStore = µm.pageStatsFromTabId(tabId); }
// https://github.com/gorhill/httpswitchboard/issues/342
// Is this hyperlink auditing?
// If yes, create a synthetic URL for reporting hyperlink auditing
// in request log. This way the user is better informed of what went
// on.
var requestURL = details.url; var requestType = requestTypeNormalizer[details.type]; if ( requestType === 'other' ) { var linkAuditor = hyperlinkAuditorFromHeaders(details.requestHeaders); if ( linkAuditor ) { var block = µm.userSettings.processHyperlinkAuditing; pageStore.recordRequest('other', requestURL + '{Ping-To:' + linkAuditor + '}', block); if ( block ) { µm.hyperlinkAuditingFoiledCounter += 1; return { 'cancel': true }; } } }
// If we reach this point, request is not blocked, so what is left to do
// is to sanitize headers.
var reqHostname = µm.hostnameFromURL(requestURL); var changed = false;
if ( µm.mustBlock(pageStore.pageHostname, reqHostname, 'cookie') ) { changed = foilCookieHeaders(µm, details) || changed; }
if ( µm.tMatrix.evaluateSwitchZ('referrer-spoof', pageStore.pageHostname) ) { changed = foilRefererHeaders(µm, reqHostname, details) || changed; }
if ( µm.tMatrix.evaluateSwitchZ('ua-spoof', pageStore.pageHostname) ) { changed = foilUserAgent(µm, details) || changed; // https://github.com/gorhill/httpswitchboard/issues/252
// To avoid potential mismatch between the user agent from HTTP headers
// and the user agent from subrequests and the window.navigator object,
// I could always store here the effective user agent, but I am really
// not convinced it is worth the added overhead given the low
// probability and the benign consequence if it ever happen. Can always
// be revised if ever I become aware a mismatch is a terrible thing
}
if ( changed ) { // console.debug('onBeforeSendHeadersHandler()> CHANGED "%s": %o', requestURL, details);
return { requestHeaders: details.requestHeaders }; }};
/******************************************************************************/
// http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#hyperlink-auditing
//
// Target URL = the href of the link
// Doc URL = URL of the document containing the target URL
// Ping URLs = servers which will be told that user clicked target URL
//
// `Content-Type` = `text/ping` (always present)
// `Ping-To` = target URL (always present)
// `Ping-From` = doc URL
// `Referer` = doc URL
// request URL = URL which will receive the information
//
// With hyperlink-auditing, removing header(s) is pointless, the whole
// request must be cancelled.
var hyperlinkAuditorFromHeaders = function(headers) { var i = headers.length; while ( i-- ) { if ( headers[i].name.toLowerCase() === 'ping-to' ) { return headers[i].value; } } return;};
/******************************************************************************/
var tabIdFromHeaders = function(µm, headers) { var header; var i = headers.length; while ( i-- ) { header = headers[i]; if ( header.name.toLowerCase() === 'referer' ) { return µm.tabIdFromPageUrl(header.value); } if ( header.name.toLowerCase() === 'ping-from' ) { return µm.tabIdFromPageUrl(header.value); } } return -1;};
/******************************************************************************/
var foilCookieHeaders = function(µm, details) { var changed = false; var headers = details.requestHeaders; var header; var i = headers.length; while ( i-- ) { header = headers[i]; if ( header.name.toLowerCase() !== 'cookie' ) { continue; } // console.debug('foilCookieHeaders()> foiled browser attempt to send cookie(s) to "%s"', details.url);
headers.splice(i, 1); µm.cookieHeaderFoiledCounter++; changed = true; } return changed;};
/******************************************************************************/
var foilRefererHeaders = function(µm, toHostname, details) { var headers = details.requestHeaders; var i = headers.length, header; while ( i-- ) { header = headers[i]; if ( header.name.toLowerCase() === 'referer' ) { break; } } if ( i === -1 ) { return false; } var µmuri = µm.URI; var fromDomain = µmuri.domainFromURI(header.value); var toDomain = µmuri.domainFromHostname(toHostname); if ( toDomain === fromDomain ) { return false; } //console.debug('foilRefererHeaders()> foiled referer for "%s"', details.url);
//console.debug('\treferrer "%s"', header.value);
// https://github.com/gorhill/httpswitchboard/issues/222#issuecomment-44828402
header.value = µmuri.schemeFromURI(details.url) + '://' + toHostname + '/'; //console.debug('\treplaced with "%s"', header.value);
µm.refererHeaderFoiledCounter++; return true;};
/******************************************************************************/
var foilUserAgent = function(µm, details) { var headers = details.requestHeaders; var header; var i = 0; while ( header = headers[i] ) { if ( header.name.toLowerCase() === 'user-agent' ) { header.value = µm.userAgentReplaceStr; return true; // Assuming only one `user-agent` entry
} i += 1; } return false;};
/******************************************************************************/
// To prevent inline javascript from being executed.
// Prevent inline scripting using `Content-Security-Policy`:
// https://dvcs.w3.org/hg/content-security-policy/raw-file/tip/csp-specification.dev.html
// This fixes:
// https://github.com/gorhill/httpswitchboard/issues/35
var onHeadersReceived = function(details) {
// console.debug('onHeadersReceived()> "%s": %o', details.url, details);
// Ignore schemes other than 'http...'
if ( details.url.slice(0, 4) !== 'http' ) { return; }
var requestType = requestTypeNormalizer[details.type]; if ( requestType === 'frame' ) { return onSubDocHeadersReceived(details); } if ( requestType === 'doc' ) { return onMainDocHeadersReceived(details); }};
/******************************************************************************/
var onMainDocHeadersReceived = function(details) {
// console.debug('onMainDocHeadersReceived()> "%s": %o', details.url, details);
var µm = µMatrix;
// Do not ignore traffic outside tabs.
// https://github.com/gorhill/httpswitchboard/issues/91#issuecomment-37180275
var tabId = details.tabId; if ( tabId < 0 ) { tabId = µm.behindTheSceneTabId; }
var µmuri = µm.URI.set(details.url); var requestURL = µmuri.normalizedURI(); var requestScheme = µmuri.scheme; var requestHostname = µmuri.hostname;
// rhill 2013-12-07:
// Apparently in Opera, onBeforeRequest() is triggered while the
// URL is not yet bound to a tab (-1), which caused the code here
// to not be able to lookup the pageStats. So let the code here bind
// the page to a tab if not done yet.
// https://github.com/gorhill/httpswitchboard/issues/75
µm.bindTabToPageStats(tabId, requestURL);
// Re-classify orphan HTTP requests as behind-the-scene requests. There is
// not much else which can be done, because there are URLs
// which cannot be handled by HTTP Switchboard, i.e. `opera://startpage`,
// as this would lead to complications with no obvious solution, like how
// to scope on unknown scheme? Etc.
// https://github.com/gorhill/httpswitchboard/issues/191
// https://github.com/gorhill/httpswitchboard/issues/91#issuecomment-37180275
var pageStats = µm.pageStatsFromTabId(tabId); if ( !pageStats ) { tabId = µm.behindTheSceneTabId; pageStats = µm.pageStatsFromTabId(tabId); }
var headers = details.responseHeaders;
// Simplify code paths by splitting func in two different handlers, one
// for main docs, one for sub docs.
// rhill 2014-01-15: Report redirects.
// https://github.com/gorhill/httpswitchboard/issues/112
// rhill 2014-02-10: Handle all redirects.
// https://github.com/gorhill/httpswitchboard/issues/188
if ( /\s+30[12378]\s+/.test(details.statusLine) ) { var i = headerIndexFromName('location', headers); if ( i >= 0 ) { // rhill 2014-01-20: Be ready to handle relative URLs.
// https://github.com/gorhill/httpswitchboard/issues/162
var locationURL = µmuri.set(headers[i].value.trim()).normalizedURI(); if ( µmuri.authority === '' ) { locationURL = requestScheme + '://' + requestHostname + µmuri.path; } µm.redirectRequests[locationURL] = requestURL; } // console.debug('onMainDocHeadersReceived()> redirect "%s" to "%s"', requestURL, headers[i].value);
}
// rhill 2014-01-15: Report redirects if any.
// https://github.com/gorhill/httpswitchboard/issues/112
if ( details.statusLine.indexOf(' 200') > 0 ) { var mainFrameStack = [requestURL]; var destinationURL = requestURL; var sourceURL; while ( sourceURL = µm.redirectRequests[destinationURL] ) { mainFrameStack.push(sourceURL); delete µm.redirectRequests[destinationURL]; destinationURL = sourceURL; }
while ( destinationURL = mainFrameStack.pop() ) { pageStats.recordRequest('doc', destinationURL, false); } }
// Maybe modify inbound headers
var csp = '';
// Enforce strict HTTPS?
if ( requestScheme === 'https' && µm.tMatrix.evaluateSwitchZ('https-strict', pageStats.pageHostname) ) { csp += "default-src chrome-search: data: https: wss: 'unsafe-eval' 'unsafe-inline';"; }
// https://github.com/gorhill/httpswitchboard/issues/181
pageStats.pageScriptBlocked = µm.mustBlock(pageStats.pageHostname, requestHostname, 'script'); if ( pageStats.pageScriptBlocked ) { // If javascript not allowed, say so through a `Content-Security-Policy` directive.
// console.debug('onMainDocHeadersReceived()> PAGE CSP "%s": %o', details.url, details);
csp += " script-src 'none'"; }
// https://github.com/gorhill/httpswitchboard/issues/181
if ( csp !== '' ) { headers.push({ 'name': 'Content-Security-Policy', 'value': csp.trim() }); return { responseHeaders: headers }; }};
/******************************************************************************/
var onSubDocHeadersReceived = function(details) {
// console.debug('onSubDocHeadersReceived()> "%s": %o', details.url, details);
var µm = µMatrix;
// Do not ignore traffic outside tabs.
// https://github.com/gorhill/httpswitchboard/issues/91#issuecomment-37180275
var tabId = details.tabId; if ( tabId < 0 ) { tabId = µm.behindTheSceneTabId; }
// Re-classify orphan HTTP requests as behind-the-scene requests. There is
// not much else which can be done, because there are URLs
// which cannot be handled by HTTP Switchboard, i.e. `opera://startpage`,
// as this would lead to complications with no obvious solution, like how
// to scope on unknown scheme? Etc.
// https://github.com/gorhill/httpswitchboard/issues/191
// https://github.com/gorhill/httpswitchboard/issues/91#issuecomment-37180275
var pageStats = µm.pageStatsFromTabId(tabId); if ( !pageStats ) { tabId = µm.behindTheSceneTabId; pageStats = µm.pageStatsFromTabId(tabId); }
// Evaluate
if ( µm.mustAllow(pageStats.pageHostname, µm.hostnameFromURL(details.url), 'script') ) { return; }
// If javascript not allowed, say so through a `Content-Security-Policy`
// directive.
// For inline javascript within iframes, we need to sandbox.
// https://github.com/gorhill/httpswitchboard/issues/73
// Now because sandbox cancels all permissions, this means
// not just javascript is disabled. To avoid negative side
// effects, I allow some other permissions, but...
// https://github.com/gorhill/uMatrix/issues/27
// Need to add `allow-popups` to prevent completely breaking links on
// some sites old style sites.
// TODO: Reuse CSP `sandbox` directive if it's already in the
// headers (strip out `allow-scripts` if present),
// and find out if the `sandbox` in the header interfere with a
// `sandbox` attribute which might be present on the iframe.
// console.debug('onSubDocHeadersReceived()> FRAME CSP "%s": %o, scope="%s"', details.url, details, pageURL);
details.responseHeaders.push({ 'name': 'Content-Security-Policy', 'value': 'sandbox allow-forms allow-same-origin allow-popups allow-top-navigation' });
return { responseHeaders: details.responseHeaders };};
/******************************************************************************/
// As per Chrome API doc, webRequest.onErrorOccurred event is the last
// one called in the sequence of webRequest events.
// http://developer.chrome.com/extensions/webRequest.html
var onErrorOccurredHandler = function(details) { // console.debug('onErrorOccurred()> "%s": %o', details.url, details);
var requestType = requestTypeNormalizer[details.type];
// Ignore all that is not a main document
if ( requestType !== 'doc'|| details.parentFrameId >= 0 ) { return; }
var µm = µMatrix; var pageStats = µm.pageStatsFromPageUrl(details.url); if ( !pageStats ) { return; }
// rhill 2014-01-28: Unwind the stack of redirects if any. Chromium will
// emit an error when a web page redirects apparently endlessly, so
// we need to unravel and report all these redirects upon error.
// https://github.com/gorhill/httpswitchboard/issues/171
var requestURL = µm.URI.set(details.url).normalizedURI(); var mainFrameStack = [requestURL]; var destinationURL = requestURL; var sourceURL; while ( sourceURL = µm.redirectRequests[destinationURL] ) { mainFrameStack.push(sourceURL); delete µm.redirectRequests[destinationURL]; destinationURL = sourceURL; }
while ( destinationURL = mainFrameStack.pop() ) { pageStats.recordRequest('doc', destinationURL, false); }};
/******************************************************************************/
// Caller must ensure headerName is normalized to lower case.
var headerIndexFromName = function(headerName, headers) { var i = headers.length; while ( i-- ) { if ( headers[i].name.toLowerCase() === headerName ) { return i; } } return -1;};
/******************************************************************************/
var requestTypeNormalizer = { 'main_frame' : 'doc', 'sub_frame' : 'frame', 'stylesheet' : 'css', 'script' : 'script', 'image' : 'image', 'object' : 'plugin', 'xmlhttprequest': 'xhr', 'other' : 'other'};
/******************************************************************************/
var start = function() { chrome.webRequest.onBeforeRequest.addListener( //function(details) {
// quickProfiler.start('onBeforeRequest');
// var r = onBeforeRequestHandler(details);
// quickProfiler.stop();
// return r;
//},
onBeforeRequestHandler, { "urls": [ "http://*/*", "https://*/*", "chrome-extension://*/*" ], "types": [ "main_frame", "sub_frame", 'stylesheet', "script", "image", "object", "xmlhttprequest", "other" ] }, [ "blocking" ] );
//console.log('µMatrix > Beginning to intercept net requests at %s', (new Date()).toISOString());
chrome.webRequest.onBeforeSendHeaders.addListener( onBeforeSendHeadersHandler, { 'urls': [ "http://*/*", "https://*/*" ] }, ['blocking', 'requestHeaders'] );
chrome.webRequest.onHeadersReceived.addListener( onHeadersReceived, { 'urls': [ "http://*/*", "https://*/*" ] }, ['blocking', 'responseHeaders'] );
chrome.webRequest.onErrorOccurred.addListener( onErrorOccurredHandler, { 'urls': [ "http://*/*", "https://*/*" ] } );};
/******************************************************************************/
return { blockedRootFramePrefix: 'data:text/html;base64,' + btoa(rootFrameReplacement).slice(0, 80), start: start};
/******************************************************************************/
})();
/******************************************************************************/
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