/
traffic.js
1265 lines (1073 loc) · 42.3 KB
/
traffic.js
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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
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
*/
/* globals browser */
'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 * as sfp from './static-filtering-parser.js';
import * as fc from './filtering-context.js';
import { isNetworkURI } from './uri-utils.js';
import {
sessionFirewall,
sessionSwitches,
sessionURLFiltering,
} from './filtering-engines.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 });
/******************************************************************************/
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 ) {
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.
{
const pageStores = new Set();
let hostname = '';
let pageStoresToken = 0;
const reset = function() {
hostname = '';
pageStores.clear();
pageStoresToken = 0;
};
const gc = ( ) => {
if ( pageStoresToken !== µb.pageStoresToken ) { return reset(); }
gcTimer.on(30011);
};
const gcTimer = vAPI.defer.create(gc);
onBeforeBehindTheSceneRequest.journalAddRequest = (fctxt, result) => {
const docHostname = fctxt.getDocHostname();
if (
docHostname !== hostname ||
pageStoresToken !== µb.pageStoresToken
) {
hostname = docHostname;
pageStores.clear();
for ( const pageStore of µb.pageStores.values() ) {
if ( pageStore.tabHostname !== docHostname ) { continue; }
pageStores.add(pageStore);
}
pageStoresToken = µb.pageStoresToken;
gcTimer.offon(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) {
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 ) {
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 };
}
}
}
const mime = mimeFromHeaders(responseHeaders);
// 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 ) {
if ( reMediaContentTypes.test(mime) ) {
pageStore.allowLargeMediaElementsUntil = 0;
// Fall-through: this could be an SVG document, which supports
// script tags.
}
}
if ( bodyFilterer.canFilter(fctxt, details) ) {
const jobs = [];
// `replace=` filter option
const replaceDirectives =
staticNetFilteringEngine.matchAndFetchModifiers(fctxt, 'replace');
if ( replaceDirectives ) {
jobs.push({
fn: textResponseFilterer,
args: [ replaceDirectives ],
});
}
// html filtering
if ( mime === 'text/html' || mime === 'application/xhtml+xml' ) {
const selectors = htmlFilteringEngine.retrieve(fctxt);
if ( selectors ) {
jobs.push({
fn: htmlResponseFilterer,
args: [ selectors ],
});
}
}
if ( jobs.length !== 0 ) {
bodyFilterer.doFilter(details.requestId, fctxt, jobs);
}
}
let modifiedHeaders = false;
if ( httpheaderFilteringEngine.apply(fctxt, responseHeaders) === true ) {
modifiedHeaders = true;
}
if ( injectCSP(fctxt, pageStore, responseHeaders) === true ) {
modifiedHeaders = true;
}
if ( injectPP(fctxt, pageStore, responseHeaders) === true ) {
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 ( 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)\//;
/******************************************************************************/
const mimeFromHeaders = headers => {
if ( Array.isArray(headers) === false ) { return ''; }
return mimeFromContentType(headerValueFromName('content-type', headers));
};
const mimeFromContentType = contentType => {
const match = reContentTypeMime.exec(contentType);
if ( match === null ) { return ''; }
return match[0].toLowerCase();
};
const reContentTypeMime = /^[^;]+/i;
/******************************************************************************/
function textResponseFilterer(session, directives) {
const applied = [];
for ( const directive of directives ) {
if ( directive.refs instanceof Object === false ) { continue; }
if ( directive.result !== 1 ) {
applied.push(directive);
continue;
}
const { refs } = directive;
if ( refs.$cache === null ) {
refs.$cache = sfp.parseReplaceValue(refs.value);
}
const cache = refs.$cache;
if ( cache === undefined ) { continue; }
cache.re.lastIndex = 0;
if ( cache.re.test(session.getString()) !== true ) { continue; }
cache.re.lastIndex = 0;
session.setString(session.getString().replace(
cache.re,
cache.replacement
));
applied.push(directive);
}
if ( applied.length === 0 ) { return; }
if ( logger.enabled !== true ) { return; }
session.setRealm('network')
.pushFilters(applied.map(a => a.logData()))
.toLogger();
}
/******************************************************************************/
function htmlResponseFilterer(session, selectors) {
if ( htmlResponseFilterer.domParser === null ) {
htmlResponseFilterer.domParser = new DOMParser();
htmlResponseFilterer.xmlSerializer = new XMLSerializer();
}
const doc = htmlResponseFilterer.domParser.parseFromString(
session.getString(),
session.mime
);
if ( selectors === undefined ) { return; }
if ( htmlFilteringEngine.apply(doc, session, selectors) !== true ) { return; }
// https://stackoverflow.com/questions/6088972/get-doctype-of-an-html-as-string-with-javascript/10162353#10162353
const doctypeStr = [
doc.doctype instanceof Object ?
htmlResponseFilterer.xmlSerializer.serializeToString(doc.doctype) + '\n' :
'',
doc.documentElement.outerHTML,
].join('\n');
session.setString(doctypeStr);
}
htmlResponseFilterer.domParser = null;
htmlResponseFilterer.xmlSerializer = null;
/*******************************************************************************
The response body filterer is responsible for:
- Realize static network filter option `replace=`
- HTML filtering
**/
const bodyFilterer = (( ) => {
const sessions = new Map();
const reContentTypeCharset = /charset=['"]?([^'" ]+)/i;
const otherValidMimes = new Set([
'application/javascript',
'application/json',
'application/mpegurl',
'application/vnd.api+json',
'application/vnd.apple.mpegurl',
'application/vnd.apple.mpegurl.audio',
'application/x-javascript',
'application/x-mpegurl',
'application/xhtml+xml',
'application/xml',
'audio/mpegurl',
'audio/x-mpegurl',
]);
const BINARY_TYPES = fc.FONT | fc.IMAGE | fc.MEDIA | fc.WEBSOCKET;
const MAX_BUFFER_LENGTH = 3 * 1024 * 1024;
let textDecoder, textEncoder;
let mime = '';
let charset = '';
const contentTypeFromDetails = details => {
switch ( details.type ) {
case 'script':
return 'text/javascript; charset=utf-8';
case 'stylesheet':
return 'text/css';
default:
break;
}
return '';
};
const charsetFromContentType = contentType => {
const match = reContentTypeCharset.exec(contentType);
if ( match === null ) { return; }
return match[1].toLowerCase();
};
const charsetFromMime = mime => {
switch ( mime ) {
case 'application/xml':
case 'application/xhtml+xml':
case 'text/html':
case 'text/css':
return;
default:
break;
}
return 'utf-8';
};
const charsetFromStream = bytes => {
if ( bytes.length < 3 ) { return; }
if ( bytes[0] === 0xEF && bytes[1] === 0xBB && bytes[2] === 0xBF ) {
return 'utf-8';
}
let i = -1;
while ( i < 65536 ) {
i += 1;
/* c */ if ( bytes[i+0] !== 0x63 ) { continue; }
/* h */ if ( bytes[i+1] !== 0x68 ) { continue; }
/* a */ if ( bytes[i+2] !== 0x61 ) { continue; }
/* r */ if ( bytes[i+3] !== 0x72 ) { continue; }
/* s */ if ( bytes[i+4] !== 0x73 ) { continue; }
/* e */ if ( bytes[i+5] !== 0x65 ) { continue; }
/* t */ if ( bytes[i+6] !== 0x74 ) { continue; }
break;
}
if ( (i + 40) >= 65536 ) { return; }
i += 8;
// find first alpha character
let j = -1;
while ( j < 8 ) {
j += 1;
const c = bytes[i+j];
if ( c >= 0x41 && c <= 0x5A ) { break; }
if ( c >= 0x61 && c <= 0x7A ) { break; }
}
if ( j === 8 ) { return; }
i += j;
// Collect characters until first non charset-name-character
const chars = [];
j = 0;
while ( j < 24 ) {
const c = bytes[i+j];
if ( c < 0x2D ) { break; }
if ( c > 0x2D && c < 0x30 ) { break; }
if ( c > 0x39 && c < 0x41 ) { break; }
if ( c > 0x5A && c < 0x61 ) { break; }
if ( c > 0x7A ) { break; }
chars.push(c);
j += 1;
}
if ( j === 20 ) { return; }
return String.fromCharCode(...chars).toLowerCase();
};
const streamClose = (session, buffer) => {
if ( buffer !== undefined ) {
session.stream.write(buffer);
} else if ( session.buffer !== undefined ) {
session.stream.write(session.buffer);
}
session.stream.close();
};
const onStreamData = function(ev) {
const session = sessions.get(this);
if ( session === undefined ) {
this.write(ev.data);
this.disconnect();
return;
}
if ( this.status !== 'transferringdata' ) {
if ( this.status !== 'finishedtransferringdata' ) {
sessions.delete(this);
this.disconnect();
return;
}
}
if ( session.buffer === null ) {
session.buffer = new Uint8Array(ev.data);
return;
}
const buffer = new Uint8Array(
session.buffer.byteLength + ev.data.byteLength
);
buffer.set(session.buffer);
buffer.set(new Uint8Array(ev.data), session.buffer.byteLength);
session.buffer = buffer;
if ( session.buffer.length >= MAX_BUFFER_LENGTH ) {
sessions.delete(this);
this.write(session.buffer);
this.disconnect();
}
};
const onStreamStop = function() {
const session = sessions.get(this);
sessions.delete(this);
if ( session === undefined || session.buffer === null ) {
this.close();
return;
}
if ( this.status !== 'finishedtransferringdata' ) { return; }
// If encoding is still unknown, try to extract from stream data.
// Just assume utf-8 if ultimately no encoding can be looked up.
if ( session.charset === undefined ) {
const charsetFound = charsetFromStream(session.buffer);
if ( charsetFound !== undefined ) {
const charsetUsed = textEncode.normalizeCharset(charsetFound);
if ( charsetUsed === undefined ) { return streamClose(session); }
session.charset = charsetUsed;
} else {
session.charset = 'utf-8';
}
}
while ( session.jobs.length !== 0 ) {
const job = session.jobs.shift();
job.fn(session, ...job.args);
}
if ( session.modified !== true ) { return streamClose(session); }
if ( textEncoder === undefined ) {
textEncoder = new TextEncoder();
}
let encodedStream = textEncoder.encode(session.str);
if ( session.charset !== 'utf-8' ) {
encodedStream = textEncode.encode(session.charset, encodedStream);
}
streamClose(session, encodedStream);
};
const onStreamError = function() {
sessions.delete(this);
};
return class Session extends µb.FilteringContext {
constructor(fctxt, mime, charset, jobs) {
super(fctxt);
this.stream = null;
this.buffer = null;
this.mime = mime;
this.charset = charset;
this.str = null;
this.modified = false;
this.jobs = jobs;
}
getString() {
if ( this.str !== null ) { return this.str; }
if ( textDecoder !== undefined ) {
if ( textDecoder.encoding !== this.charset ) {
textDecoder = undefined;
}
}
if ( textDecoder === undefined ) {
textDecoder = new TextDecoder(this.charset);
}
this.str = textDecoder.decode(this.buffer);
return this.str;
}
setString(s) {
this.str = s;
this.modified = true;
}
static doFilter(requestId, fctxt, jobs) {
if ( jobs.length === 0 ) { return; }
const session = new Session(fctxt, mime, charset, jobs);
session.stream = browser.webRequest.filterResponseData(requestId);
session.stream.ondata = onStreamData;
session.stream.onstop = onStreamStop;
session.stream.onerror = onStreamError;
sessions.set(session.stream, session);
}
static canFilter(fctxt, details) {
if ( µb.canFilterResponseData !== true ) { return; }
if ( (fctxt.itype & BINARY_TYPES) !== 0 ) { return; }
if ( fctxt.method !== fc.METHOD_GET ) {
if ( fctxt.method !== fc.METHOD_POST ) {
return;
}
}
// https://github.com/gorhill/uBlock/issues/3478
const statusCode = details.statusCode || 0;
if ( statusCode === 0 ) { return; }
const hostname = fctxt.getHostname();
if ( hostname === '' ) { return; }
// https://bugzilla.mozilla.org/show_bug.cgi?id=1426789
const headers = details.responseHeaders;
const disposition = headerValueFromName('content-disposition', headers);
if ( disposition !== '' ) {
if ( disposition.startsWith('inline') === false ) { return; }
}
mime = 'text/plain';
charset = 'utf-8';
const contentType = headerValueFromName('content-type', headers) ||
contentTypeFromDetails(details);
if ( contentType !== '' ) {
mime = mimeFromContentType(contentType);
if ( mime === undefined ) { return; }
if ( mime.startsWith('text/') === false ) {
if ( otherValidMimes.has(mime) === false ) { return; }
}
charset = charsetFromContentType(contentType);
if ( charset !== undefined ) {
charset = textEncode.normalizeCharset(charset);
if ( charset === undefined ) { return; }
} else {
charset = charsetFromMime(mime);
}
}
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