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traffic.js
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/*******************************************************************************
uBlock Origin - a browser extension to block requests.
Copyright (C) 2014-present 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/uBlock
*/
'use strict';
/******************************************************************************/
import htmlFilteringEngine from './html-filtering.js';
import httpheaderFilteringEngine from './httpheader-filtering.js';
import logger from './logger.js';
import scriptletFilteringEngine from './scriptlet-filtering.js';
import staticNetFilteringEngine from './static-net-filtering.js';
import textEncode from './text-encode.js';
import µb from './background.js';
import {
sessionFirewall,
sessionSwitches,
sessionURLFiltering,
} from './filtering-engines.js';
import {
entityFromDomain,
isNetworkURI,
} from './uri-utils.js';
/******************************************************************************/
// Platform-specific behavior.
// https://github.com/uBlockOrigin/uBlock-issues/issues/42
// https://bugzilla.mozilla.org/show_bug.cgi?id=1376932
// Add proper version number detection once issue is fixed in Firefox.
let dontCacheResponseHeaders =
vAPI.webextFlavor.soup.has('firefox');
// The real actual webextFlavor value may not be set in stone, so listen
// for possible future changes.
window.addEventListener('webextFlavor', function() {
dontCacheResponseHeaders =
vAPI.webextFlavor.soup.has('firefox');
}, { once: true });
// https://github.com/uBlockOrigin/uBlock-issues/issues/1553
const supportsFloc = document.interestCohort instanceof Function;
/******************************************************************************/
const patchLocalRedirectURL = url => url.charCodeAt(0) === 0x2F /* '/' */
? vAPI.getURL(url)
: url;
/******************************************************************************/
// Intercept and filter web requests.
const onBeforeRequest = function(details) {
const fctxt = µb.filteringContext.fromWebrequestDetails(details);
// Special handling for root document.
// https://github.com/chrisaljoudi/uBlock/issues/1001
// This must be executed regardless of whether the request is
// behind-the-scene
if ( fctxt.itype === fctxt.MAIN_FRAME ) {
return onBeforeRootFrameRequest(fctxt);
}
// Special treatment: behind-the-scene requests
const tabId = details.tabId;
if ( tabId < 0 ) {
return onBeforeBehindTheSceneRequest(fctxt);
}
// Lookup the page store associated with this tab id.
let pageStore = µb.pageStoreFromTabId(tabId);
if ( pageStore === null ) {
const tabContext = µb.tabContextManager.mustLookup(tabId);
if ( tabContext.tabId < 0 ) {
return onBeforeBehindTheSceneRequest(fctxt);
}
vAPI.tabs.onNavigation({ tabId, frameId: 0, url: tabContext.rawURL });
pageStore = µb.pageStoreFromTabId(tabId);
}
const result = pageStore.filterRequest(fctxt);
pageStore.journalAddRequest(fctxt, result);
if ( logger.enabled ) {
fctxt.setRealm('network').toLogger();
}
// Redirected
if ( fctxt.redirectURL !== undefined ) {
return { redirectUrl: patchLocalRedirectURL(fctxt.redirectURL) };
}
// Not redirected
// Blocked
if ( result === 1 ) {
return { cancel: true };
}
// Not blocked
if (
fctxt.itype === fctxt.SUB_FRAME &&
details.parentFrameId !== -1 &&
details.aliasURL === undefined
) {
pageStore.setFrameURL(details);
}
if ( result === 2 ) {
return { cancel: false };
}
};
/******************************************************************************/
const onBeforeRootFrameRequest = function(fctxt) {
const requestURL = fctxt.url;
// Special handling for root document.
// https://github.com/chrisaljoudi/uBlock/issues/1001
// This must be executed regardless of whether the request is
// behind-the-scene
const requestHostname = fctxt.getHostname();
let result = 0;
let logData;
// If the site is whitelisted, disregard strict blocking
const trusted = µb.getNetFilteringSwitch(requestURL) === false;
if ( trusted ) {
result = 2;
if ( logger.enabled ) {
logData = { engine: 'u', result: 2, raw: 'whitelisted' };
}
}
// Permanently unrestricted?
if (
result === 0 &&
sessionSwitches.evaluateZ('no-strict-blocking', requestHostname)
) {
result = 2;
if ( logger.enabled ) {
logData = {
engine: 'u',
result: 2,
raw: `no-strict-blocking: ${sessionSwitches.z} true`
};
}
}
// Temporarily whitelisted?
if ( result === 0 && strictBlockBypasser.isBypassed(requestHostname) ) {
result = 2;
if ( logger.enabled ) {
logData = {
engine: 'u',
result: 2,
raw: 'no-strict-blocking: true (temporary)'
};
}
}
// Static filtering
if ( result === 0 ) {
({ result, logData } = shouldStrictBlock(fctxt, logger.enabled));
}
const pageStore = µb.bindTabToPageStore(fctxt.tabId, 'beforeRequest');
if ( pageStore !== null ) {
pageStore.journalAddRootFrame('uncommitted', requestURL);
pageStore.journalAddRequest(fctxt, result);
}
if ( logger.enabled ) {
fctxt.setFilter(logData);
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/760
// Redirect non-blocked request?
if (
result !== 1 &&
trusted === false &&
pageStore !== null &&
staticNetFilteringEngine.hasQuery(fctxt)
) {
pageStore.redirectNonBlockedRequest(fctxt);
}
if ( logger.enabled ) {
fctxt.setRealm('network').toLogger();
}
// Redirected
if ( fctxt.redirectURL !== undefined ) {
return { redirectUrl: patchLocalRedirectURL(fctxt.redirectURL) };
}
// Not blocked
if ( result !== 1 ) { return; }
// No log data means no strict blocking (because we need to report why
// the blocking occurs.
if ( logData === undefined ) { return; }
// Blocked
const query = encodeURIComponent(JSON.stringify({
url: requestURL,
hn: requestHostname,
dn: fctxt.getDomain() || requestHostname,
fs: logData.raw
}));
vAPI.tabs.replace(
fctxt.tabId,
vAPI.getURL('document-blocked.html?details=') + query
);
return { cancel: true };
};
/******************************************************************************/
// Strict blocking through static filtering
//
// https://github.com/chrisaljoudi/uBlock/issues/1128
// Do not block if the match begins after the hostname,
// except when the filter is specifically of type `other`.
// https://github.com/gorhill/uBlock/issues/490
// Removing this for the time being, will need a new, dedicated type.
// https://github.com/uBlockOrigin/uBlock-issues/issues/1501
// Support explicit exception filters.
//
// Let result of match for specific `document` type be `rs`
// Let result of match for no specific type be `rg` *after* going through
// confirmation necessary for implicit matches
// Let `important` be `i`
// Let final result be logical combination of `rs` and `rg` as follow:
//
// | rs |
// +--------+--------+--------+--------|
// | 0 | 1 | 1i | 2 |
// --------+--------+--------+--------+--------+--------|
// | 0 | rg | rs | rs | rs |
// rg | 1 | rg | rs | rs | rs |
// | 1i | rg | rg | rs | rg |
// | 2 | rg | rg | rs | rs |
// --------+--------+--------+--------+--------+--------+
const shouldStrictBlock = function(fctxt, loggerEnabled) {
const snfe = staticNetFilteringEngine;
// Explicit filtering: `document` option
const rs = snfe.matchRequest(fctxt, 0b0011);
const is = rs === 1 && snfe.isBlockImportant();
let lds;
if ( rs !== 0 || loggerEnabled ) {
lds = snfe.toLogData();
}
// | rs |
// +--------+--------+--------+--------|
// | 0 | 1 | 1i | 2 |
// --------+--------+--------+--------+--------+--------|
// | 0 | rg | rs | x | rs |
// rg | 1 | rg | rs | x | rs |
// | 1i | rg | rg | x | rg |
// | 2 | rg | rg | x | rs |
// --------+--------+--------+--------+--------+--------+
if ( rs === 1 && is ) {
return { result: rs, logData: lds };
}
// Implicit filtering: no `document` option
fctxt.type = 'no_type';
let rg = snfe.matchRequest(fctxt, 0b0011);
fctxt.type = 'main_frame';
const ig = rg === 1 && snfe.isBlockImportant();
let ldg;
if ( rg !== 0 || loggerEnabled ) {
ldg = snfe.toLogData();
if ( rg === 1 && validateStrictBlock(fctxt, ldg) === false ) {
rg = 0; ldg = undefined;
}
}
// | rs |
// +--------+--------+--------+--------|
// | 0 | 1 | 1i | 2 |
// --------+--------+--------+--------+--------+--------|
// | 0 | x | rs | - | rs |
// rg | 1 | x | rs | - | rs |
// | 1i | x | x | - | x |
// | 2 | x | x | - | rs |
// --------+--------+--------+--------+--------+--------+
if ( rs === 0 || rg === 1 && ig || rg === 2 && rs !== 2 ) {
return { result: rg, logData: ldg };
}
// | rs |
// +--------+--------+--------+--------|
// | 0 | 1 | 1i | 2 |
// --------+--------+--------+--------+--------+--------|
// | 0 | - | x | - | x |
// rg | 1 | - | x | - | x |
// | 1i | - | - | - | - |
// | 2 | - | - | - | x |
// --------+--------+--------+--------+--------+--------+
return { result: rs, logData: lds };
};
/******************************************************************************/
// https://github.com/gorhill/uBlock/issues/3208
// Mind case insensitivity.
// https://github.com/uBlockOrigin/uBlock-issues/issues/1147
// Do not strict-block if the filter pattern does not contain at least one
// token character.
const validateStrictBlock = function(fctxt, logData) {
if ( typeof logData.regex !== 'string' ) { return false; }
if ( typeof logData.raw === 'string' && /\w/.test(logData.raw) === false ) {
return false;
}
const url = fctxt.url;
const re = new RegExp(logData.regex, 'i');
const match = re.exec(url.toLowerCase());
if ( match === null ) { return false; }
// https://github.com/chrisaljoudi/uBlock/issues/1128
// https://github.com/chrisaljoudi/uBlock/issues/1212
// Verify that the end of the match is anchored to the end of the
// hostname.
// https://github.com/uBlockOrigin/uAssets/issues/7619#issuecomment-653010310
// Also match FQDN.
const hostname = fctxt.getHostname();
const hnpos = url.indexOf(hostname);
const hnlen = hostname.length;
const end = match.index + match[0].length - hnpos - hnlen;
return end === 0 || end === 1 ||
end === 2 && url.charCodeAt(hnpos + hnlen) === 0x2E /* '.' */;
};
/******************************************************************************/
// Intercept and filter behind-the-scene requests.
const onBeforeBehindTheSceneRequest = function(fctxt) {
const pageStore = µb.pageStoreFromTabId(fctxt.tabId);
if ( pageStore === null ) { return; }
// https://github.com/gorhill/uBlock/issues/3150
// Ability to globally block CSP reports MUST also apply to
// behind-the-scene network requests.
let result = 0;
// https://github.com/uBlockOrigin/uBlock-issues/issues/339
// Need to also test against `-scheme` since tabOrigin is normalized.
// Not especially elegant but for now this accomplishes the purpose of
// not dealing with network requests fired from a synthetic scope,
// that is unless advanced user mode is enabled.
if (
fctxt.tabOrigin.endsWith('-scheme') === false &&
isNetworkURI(fctxt.tabOrigin) ||
µb.userSettings.advancedUserEnabled ||
fctxt.itype === fctxt.CSP_REPORT
) {
result = pageStore.filterRequest(fctxt);
// The "any-tab" scope is not whitelist-able, and in such case we must
// use the origin URL as the scope. Most such requests aren't going to
// be blocked, so we test for whitelisting and modify the result only
// when the request is being blocked.
//
// https://github.com/uBlockOrigin/uBlock-issues/issues/1478
// Also remove potential redirection when request is to be
// whitelisted.
if (
result === 1 &&
µb.getNetFilteringSwitch(fctxt.tabOrigin) === false
) {
result = 2;
fctxt.redirectURL = undefined;
fctxt.filter = { engine: 'u', result: 2, raw: 'whitelisted' };
}
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/1204
onBeforeBehindTheSceneRequest.journalAddRequest(fctxt, result);
if ( logger.enabled ) {
fctxt.setRealm('network').toLogger();
}
// Redirected
if ( fctxt.redirectURL !== undefined ) {
return { redirectUrl: patchLocalRedirectURL(fctxt.redirectURL) };
}
// Blocked?
if ( result === 1 ) {
return { cancel: true };
}
};
// https://github.com/uBlockOrigin/uBlock-issues/issues/1204
// Report the tabless network requests to all page stores matching the
// document origin. This is an approximation, there is unfortunately no
// way to know for sure which exact page triggered a tabless network
// request.
{
let hostname = '';
let pageStores = new Set();
let pageStoresToken = 0;
let gcTimer;
const reset = function() {
hostname = '';
pageStores = new Set();
pageStoresToken = 0;
};
const gc = ( ) => {
gcTimer = undefined;
if ( pageStoresToken !== µb.pageStoresToken ) { return reset(); }
gcTimer = vAPI.setTimeout(gc, 30011);
};
onBeforeBehindTheSceneRequest.journalAddRequest = (fctxt, result) => {
const docHostname = fctxt.getDocHostname();
if (
docHostname !== hostname ||
pageStoresToken !== µb.pageStoresToken
) {
hostname = docHostname;
pageStores = new Set();
for ( const pageStore of µb.pageStores.values() ) {
if ( pageStore.tabHostname !== docHostname ) { continue; }
pageStores.add(pageStore);
}
pageStoresToken = µb.pageStoresToken;
if ( gcTimer !== undefined ) {
clearTimeout(gcTimer);
}
gcTimer = vAPI.setTimeout(gc, 30011);
}
for ( const pageStore of pageStores ) {
pageStore.journalAddRequest(fctxt, result);
}
};
}
/******************************************************************************/
// To handle:
// - Media elements larger than n kB
// - Scriptlet injection (requires ability to modify response body)
// - HTML filtering (requires ability to modify response body)
// - CSP injection
const onHeadersReceived = function(details) {
// https://github.com/uBlockOrigin/uBlock-issues/issues/610
// Process behind-the-scene requests in a special way.
if (
details.tabId < 0 &&
normalizeBehindTheSceneResponseHeaders(details) === false
) {
return;
}
const fctxt = µb.filteringContext.fromWebrequestDetails(details);
const isRootDoc = fctxt.itype === fctxt.MAIN_FRAME;
let pageStore = µb.pageStoreFromTabId(fctxt.tabId);
if ( pageStore === null ) {
if ( isRootDoc === false ) { return; }
pageStore = µb.bindTabToPageStore(fctxt.tabId, 'beforeRequest');
}
if ( pageStore.getNetFilteringSwitch(fctxt) === false ) { return; }
if ( fctxt.itype === fctxt.IMAGE || fctxt.itype === fctxt.MEDIA ) {
const result = foilLargeMediaElement(details, fctxt, pageStore);
if ( result !== undefined ) { return result; }
}
// Keep in mind response headers will be modified in-place if needed, so
// `details.responseHeaders` will always point to the modified response
// headers.
const { responseHeaders } = details;
if ( Array.isArray(responseHeaders) === false ) { return; }
if ( isRootDoc === false && µb.hiddenSettings.filterOnHeaders === true ) {
const result = pageStore.filterOnHeaders(fctxt, responseHeaders);
if ( result !== 0 ) {
if ( logger.enabled ) {
fctxt.setRealm('network').toLogger();
}
if ( result === 1 ) {
pageStore.journalAddRequest(fctxt, 1);
return { cancel: true };
}
}
}
if ( isRootDoc === false && fctxt.itype !== fctxt.SUB_FRAME ) { return; }
// https://github.com/gorhill/uBlock/issues/2813
// Disable the blocking of large media elements if the document is itself
// a media element: the resource was not prevented from loading so no
// point to further block large media elements for the current document.
if ( isRootDoc ) {
const contentType = headerValueFromName('content-type', responseHeaders);
if ( reMediaContentTypes.test(contentType) ) {
pageStore.allowLargeMediaElementsUntil = 0;
// Fall-through: this could be an SVG document, which supports
// script tags.
}
}
// At this point we have a HTML document.
const filteredHTML =
µb.canFilterResponseData && filterDocument(fctxt, details) === true;
let modifiedHeaders = false;
if ( httpheaderFilteringEngine.apply(fctxt, responseHeaders) === true ) {
modifiedHeaders = true;
}
if ( injectCSP(fctxt, pageStore, responseHeaders) === true ) {
modifiedHeaders = true;
}
if ( supportsFloc && foilFloc(fctxt, responseHeaders) ) {
modifiedHeaders = true;
}
// https://bugzilla.mozilla.org/show_bug.cgi?id=1376932
// Prevent document from being cached by the browser if we modified it,
// either through HTML filtering and/or modified response headers.
// https://github.com/uBlockOrigin/uBlock-issues/issues/229
// Use `no-cache` instead of `no-cache, no-store, must-revalidate`, this
// allows Firefox's offline mode to work as expected.
if ( (filteredHTML || modifiedHeaders) && dontCacheResponseHeaders ) {
const cacheControl = µb.hiddenSettings.cacheControlForFirefox1376932;
if ( cacheControl !== 'unset' ) {
let i = headerIndexFromName('cache-control', responseHeaders);
if ( i !== -1 ) {
responseHeaders[i].value = cacheControl;
} else {
responseHeaders.push({ name: 'Cache-Control', value: cacheControl });
}
modifiedHeaders = true;
}
}
if ( modifiedHeaders ) {
return { responseHeaders };
}
};
const reMediaContentTypes = /^(?:audio|image|video)\//;
/******************************************************************************/
// https://github.com/uBlockOrigin/uBlock-issues/issues/610
const normalizeBehindTheSceneResponseHeaders = function(details) {
if ( details.type !== 'xmlhttprequest' ) { return false; }
const headers = details.responseHeaders;
if ( Array.isArray(headers) === false ) { return false; }
const contentType = headerValueFromName('content-type', headers);
if ( contentType === '' ) { return false; }
if ( reMediaContentTypes.test(contentType) === false ) { return false; }
if ( contentType.startsWith('image') ) {
details.type = 'image';
} else {
details.type = 'media';
}
return true;
};
/*******************************************************************************
The response body filterer is responsible for:
- HTML filtering
In the spirit of efficiency, the response body filterer works this way:
If:
- HTML filtering: no.
Then:
No response body filtering is initiated.
If:
- HTML filtering: yes.
Then:
Assemble all response body data into a single buffer. Once all the
response data has been received, create a document from it. Then:
- Remove all DOM elements matching HTML filters.
Then serialize the resulting modified document as the new response
body.
**/
const filterDocument = (( ) => {
const filterers = new Map();
let domParser, xmlSerializer,
utf8TextDecoder, textDecoder, textEncoder;
const textDecode = function(encoding, buffer) {
if (
textDecoder !== undefined &&
textDecoder.encoding !== encoding
) {
textDecoder = undefined;
}
if ( textDecoder === undefined ) {
textDecoder = new TextDecoder(encoding);
}
return textDecoder.decode(buffer);
};
const reContentTypeDocument = /^(?:text\/html|application\/xhtml\+xml)/i;
const reContentTypeCharset = /charset=['"]?([^'" ]+)/i;
const mimeFromContentType = function(contentType) {
const match = reContentTypeDocument.exec(contentType);
if ( match !== null ) {
return match[0].toLowerCase();
}
};
const charsetFromContentType = function(contentType) {
const match = reContentTypeCharset.exec(contentType);
if ( match !== null ) {
return match[1].toLowerCase();
}
};
const charsetFromDoc = function(doc) {
let meta = doc.querySelector('meta[charset]');
if ( meta !== null ) {
return meta.getAttribute('charset').toLowerCase();
}
meta = doc.querySelector(
'meta[http-equiv="content-type" i][content]'
);
if ( meta !== null ) {
return charsetFromContentType(meta.getAttribute('content'));
}
};
const streamClose = function(filterer, buffer) {
if ( buffer !== undefined ) {
filterer.stream.write(buffer);
} else if ( filterer.buffer !== undefined ) {
filterer.stream.write(filterer.buffer);
}
filterer.stream.close();
};
const onStreamData = function(ev) {
const filterer = filterers.get(this);
if ( filterer === undefined ) {
this.write(ev.data);
this.disconnect();
return;
}
if (
this.status !== 'transferringdata' &&
this.status !== 'finishedtransferringdata'
) {
filterers.delete(this);
this.disconnect();
return;
}
// TODO:
// - Possibly improve buffer growth, if benchmarking shows it's worth
// it.
// - Also evaluate whether keeping a list of buffers and then decoding
// them in sequence using TextDecoder's "stream" option is more
// efficient. Can the data buffers be safely kept around for later
// use?
// - Informal, quick benchmarks seem to show most of the overhead is
// from calling TextDecoder.decode() and TextEncoder.encode(), and if
// confirmed, there is nothing which can be done uBO-side to reduce
// overhead.
if ( filterer.buffer === null ) {
filterer.buffer = new Uint8Array(ev.data);
return;
}
const buffer = new Uint8Array(
filterer.buffer.byteLength +
ev.data.byteLength
);
buffer.set(filterer.buffer);
buffer.set(new Uint8Array(ev.data), filterer.buffer.byteLength);
filterer.buffer = buffer;
};
const onStreamStop = function() {
const filterer = filterers.get(this);
filterers.delete(this);
if ( filterer === undefined || filterer.buffer === null ) {
this.close();
return;
}
if ( this.status !== 'finishedtransferringdata' ) { return; }
if ( domParser === undefined ) {
domParser = new DOMParser();
xmlSerializer = new XMLSerializer();
}
if ( textEncoder === undefined ) {
textEncoder = new TextEncoder();
}
let doc;
// If stream encoding is still unknnown, try to extract from document.
let charsetFound = filterer.charset,
charsetUsed = charsetFound;
if ( charsetFound === undefined ) {
if ( utf8TextDecoder === undefined ) {
utf8TextDecoder = new TextDecoder();
}
doc = domParser.parseFromString(
utf8TextDecoder.decode(filterer.buffer.slice(0, 1024)),
filterer.mime
);
charsetFound = charsetFromDoc(doc);
charsetUsed = textEncode.normalizeCharset(charsetFound);
if ( charsetUsed === undefined ) {
return streamClose(filterer);
}
}
doc = domParser.parseFromString(
textDecode(charsetUsed, filterer.buffer),
filterer.mime
);
// https://github.com/gorhill/uBlock/issues/3507
// In case of no explicit charset found, try to find one again, but
// this time with the whole document parsed.
if ( charsetFound === undefined ) {
charsetFound = textEncode.normalizeCharset(charsetFromDoc(doc));
if ( charsetFound !== charsetUsed ) {
if ( charsetFound === undefined ) {
return streamClose(filterer);
}
charsetUsed = charsetFound;
doc = domParser.parseFromString(
textDecode(charsetFound, filterer.buffer),
filterer.mime
);
}
}
let modified = false;
if ( filterer.selectors !== undefined ) {
if ( htmlFilteringEngine.apply(doc, filterer) ) {
modified = true;
}
}
if ( modified === false ) {
return streamClose(filterer);
}
// https://stackoverflow.com/questions/6088972/get-doctype-of-an-html-as-string-with-javascript/10162353#10162353
const doctypeStr = doc.doctype instanceof Object ?
xmlSerializer.serializeToString(doc.doctype) + '\n' :
'';
// https://github.com/gorhill/uBlock/issues/3391
let encodedStream = textEncoder.encode(
doctypeStr +
doc.documentElement.outerHTML
);
if ( charsetUsed !== 'utf-8' ) {
encodedStream = textEncode.encode(
charsetUsed,
encodedStream
);
}
streamClose(filterer, encodedStream);
};
const onStreamError = function() {
filterers.delete(this);
};
return function(fctxt, extras) {
// https://github.com/gorhill/uBlock/issues/3478
const statusCode = extras.statusCode || 0;
if ( statusCode !== 0 && (statusCode < 200 || statusCode >= 300) ) {
return;
}
const hostname = fctxt.getHostname();
if ( hostname === '' ) { return; }
const domain = fctxt.getDomain();
const request = {
stream: undefined,
tabId: fctxt.tabId,
url: fctxt.url,
hostname: hostname,
domain: domain,
entity: entityFromDomain(domain),
selectors: undefined,
buffer: null,
mime: 'text/html',
charset: undefined
};
request.selectors = htmlFilteringEngine.retrieve(request);
if ( request.selectors === undefined ) { return; }
const headers = extras.responseHeaders;
const contentType = headerValueFromName('content-type', headers);
if ( contentType !== '' ) {
request.mime = mimeFromContentType(contentType);
if ( request.mime === undefined ) { return; }
let charset = charsetFromContentType(contentType);
if ( charset !== undefined ) {
charset = textEncode.normalizeCharset(charset);
if ( charset === undefined ) { return; }
request.charset = charset;
}
}
// https://bugzilla.mozilla.org/show_bug.cgi?id=1426789
if ( headerValueFromName('content-disposition', headers) ) { return; }
const stream = request.stream =
browser.webRequest.filterResponseData(extras.requestId);
stream.ondata = onStreamData;
stream.onstop = onStreamStop;
stream.onerror = onStreamError;
filterers.set(stream, request);
return true;
};
})();
/******************************************************************************/
const injectCSP = function(fctxt, pageStore, responseHeaders) {
const cspSubsets = [];
const requestType = fctxt.type;
// Start collecting policies >>>>>>>>
// ======== built-in policies
const builtinDirectives = [];
if ( pageStore.filterScripting(fctxt, true) === 1 ) {
builtinDirectives.push(µb.cspNoScripting);
if ( logger.enabled ) {
fctxt.setRealm('network').setType('scripting').toLogger();
}
}
// https://github.com/uBlockOrigin/uBlock-issues/issues/422
// We need to derive a special context for filtering `inline-script`,
// as the embedding document for this "resource" will always be the
// frame itself, not that of the parent of the frame.
else {
const fctxt2 = fctxt.duplicate();
fctxt2.type = 'inline-script';
fctxt2.setDocOriginFromURL(fctxt.url);
const result = pageStore.filterRequest(fctxt2);
if ( result === 1 ) {
builtinDirectives.push(µb.cspNoInlineScript);
}
if ( result === 2 && logger.enabled ) {
fctxt2.setRealm('network').toLogger();
}
}
// https://github.com/gorhill/uBlock/issues/1539
// - Use a CSP to also forbid inline fonts if remote fonts are blocked.
fctxt.type = 'inline-font';
if ( pageStore.filterRequest(fctxt) === 1 ) {
builtinDirectives.push(µb.cspNoInlineFont);
if ( logger.enabled ) {
fctxt.setRealm('network').toLogger();
}
}
if ( builtinDirectives.length !== 0 ) {
cspSubsets[0] = builtinDirectives.join(', ');
}
// ======== filter-based policies
// Static filtering.
fctxt.type = requestType;
const staticDirectives =
staticNetFilteringEngine.matchAndFetchModifiers(fctxt, 'csp');
if ( staticDirectives !== undefined ) {
for ( const directive of staticDirectives ) {
if ( directive.result !== 1 ) { continue; }
cspSubsets.push(directive.value);
}
}
// URL filtering `allow` rules override static filtering.
if (
cspSubsets.length !== 0 &&
sessionURLFiltering.evaluateZ(
fctxt.getTabHostname(),
fctxt.url,
'csp'
) === 2
) {
if ( logger.enabled ) {
fctxt.setRealm('network')
.setType('csp')
.setFilter(sessionURLFiltering.toLogData())
.toLogger();
}
return;
}
// Dynamic filtering `allow` rules override static filtering.
if (
cspSubsets.length !== 0 &&
µb.userSettings.advancedUserEnabled &&
sessionFirewall.evaluateCellZY(
fctxt.getTabHostname(),
fctxt.getTabHostname(),
'*'
) === 2
) {
if ( logger.enabled ) {
fctxt.setRealm('network')
.setType('csp')
.setFilter(sessionFirewall.toLogData())
.toLogger();
}
return;
}
// <<<<<<<< All policies have been collected
// Static CSP policies will be applied.
if ( logger.enabled && staticDirectives !== undefined ) {
fctxt.setRealm('network')
.pushFilters(staticDirectives.map(a => a.logData()))
.toLogger();
}
if ( cspSubsets.length === 0 ) { return; }
µb.updateToolbarIcon(fctxt.tabId, 0x02);
// Use comma to merge CSP directives.
// Ref.: https://www.w3.org/TR/CSP2/#implementation-considerations
//
// https://github.com/gorhill/uMatrix/issues/967
// Inject a new CSP header rather than modify an existing one, except
// if the current environment does not support merging headers:
// Firefox 58/webext and less can't merge CSP headers, so we will merge