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Add trusted-replace-fetch-response scriptlet
This scriplet requires a trusted source. Related issue: https://github.com/uBlockOrigin/uBlock-issues/issues/2742 See AdGuard's documentation for usage: https://github.com/AdguardTeam/Scriptlets/blob/master/wiki/about-trusted-scriptlets.md#trusted-replace-fetch-response
This commit is contained in:
Raymond Hill
parent
9f91335ae5
commit
82a7d11f78
@ -53,6 +53,9 @@ function safeSelf() {
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'RegExp_exec': self.RegExp.prototype.exec,
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'addEventListener': self.EventTarget.prototype.addEventListener,
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'removeEventListener': self.EventTarget.prototype.removeEventListener,
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'fetch': self.fetch,
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'jsonParse': self.JSON.parse.bind(self.JSON),
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'jsonStringify': self.JSON.stringify.bind(self.JSON),
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'log': console.log.bind(console),
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'uboLog': function(...args) {
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if ( args.length === 0 ) { return; }
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@ -103,10 +106,15 @@ builtinScriptlets.push({
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function patternToRegex(pattern, flags = undefined) {
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if ( pattern === '' ) { return /^/; }
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const match = /^\/(.+)\/([gimsu]*)$/.exec(pattern);
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if ( match !== null ) {
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if ( match === null ) {
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return new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), flags);
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}
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try {
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return new RegExp(match[1], match[2] || flags);
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}
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return new RegExp(pattern.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'), flags);
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catch(ex) {
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}
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return /^/;
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}
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/******************************************************************************/
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@ -210,11 +218,14 @@ function runAtHtmlElement(fn) {
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/******************************************************************************/
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builtinScriptlets.push({
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name: 'get-extra-args-entries.fn',
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fn: getExtraArgsEntries,
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name: 'get-extra-args.fn',
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fn: getExtraArgs,
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dependencies: [
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'get-extra-args-entries.fn',
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],
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});
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function getExtraArgsEntries(args, offset) {
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return args.slice(offset).reduce((out, v, i, a) => {
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function getExtraArgs(args, offset = 0) {
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const entries = args.slice(offset).reduce((out, v, i, a) => {
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if ( (i & 1) === 0 ) {
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const rawValue = a[i+1];
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const value = /^\d+$/.test(rawValue)
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@ -224,28 +235,7 @@ function getExtraArgsEntries(args, offset) {
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}
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return out;
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}, []);
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}
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builtinScriptlets.push({
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name: 'get-extra-args-map.fn',
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fn: getExtraArgsMap,
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dependencies: [
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'get-extra-args-entries.fn',
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],
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});
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function getExtraArgsMap(args, offset = 0) {
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return new Map(getExtraArgsEntries(args, offset));
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}
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builtinScriptlets.push({
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name: 'get-extra-args.fn',
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fn: getExtraArgs,
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dependencies: [
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'get-extra-args-entries.fn',
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],
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});
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function getExtraArgs(args, offset = 0) {
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return Object.fromEntries(getExtraArgsEntries(args, offset));
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return Object.fromEntries(entries);
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}
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/******************************************************************************/
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@ -447,7 +437,7 @@ function setConstantCore(
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if ( Math.abs(cValue) > 0x7FFF ) { return; }
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} else if ( trusted ) {
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if ( cValue.startsWith('{') && cValue.endsWith('}') ) {
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try { cValue = JSON.parse(cValue).value; } catch(ex) { return; }
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try { cValue = safe.jsonParse(cValue).value; } catch(ex) { return; }
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}
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} else {
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return;
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@ -2415,7 +2405,7 @@ function xmlPrune(
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log(`xmlPrune: ${item.constructor.name}.${item.nodeName} removed`);
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}
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} catch(ex) {
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if ( log ) { safeSelf().uboLog(ex); }
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log(ex);
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}
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return xmlDoc;
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};
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@ -2438,13 +2428,12 @@ function xmlPrune(
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if ( arg instanceof Request ) { return arg.url; }
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return String(arg);
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};
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const realFetch = self.fetch;
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self.fetch = new Proxy(self.fetch, {
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apply: function(target, thisArg, args) {
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if ( reUrl.test(urlFromArg(args[0])) === false ) {
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return Reflect.apply(target, thisArg, args);
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}
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return realFetch(...args).then(realResponse =>
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return safe.fetch(...args).then(realResponse =>
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realResponse.text().then(text =>
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new Response(pruneFromText(text), {
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status: realResponse.status,
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@ -3329,4 +3318,103 @@ function trustedSetLocalStorageItem(key = '', value = '') {
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setLocalStorageItemCore('local', true, key, value);
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}
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/*******************************************************************************
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*
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* trusted-replace-fetch-response.js
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*
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* Replaces response text content of fetch requests if all given parameters
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* match.
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*
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* Reference:
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* https://github.com/AdguardTeam/Scriptlets/blob/master/src/scriptlets/trusted-replace-fetch-response.js
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*
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**/
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builtinScriptlets.push({
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name: 'trusted-replace-fetch-response.js',
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requiresTrust: true,
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fn: trustedReplaceFetchResponse,
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dependencies: [
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'get-extra-args.fn',
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'pattern-to-regex.fn',
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'safe-self.fn',
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'should-log.fn',
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],
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});
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function trustedReplaceFetchResponse(
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pattern = '',
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replacement = '',
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propsToMatch = ''
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) {
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const safe = safeSelf();
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const extraArgs = getExtraArgs(Array.from(arguments), 3);
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const logLevel = shouldLog({
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log: pattern === '' || extraArgs.log,
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});
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const log = logLevel ? ((...args) => { safe.uboLog(...args); }) : (( ) => { });
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if ( pattern === '*' ) { pattern = '.*'; }
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const rePattern = patternToRegex(pattern);
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const propNeedles = new Map();
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for ( const needle of propsToMatch.split(/\s+/) ) {
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const [ prop, value ] = needle.split(':');
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if ( prop === '' ) { continue; }
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propNeedles.set(prop, patternToRegex(value));
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}
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self.fetch = new Proxy(self.fetch, {
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apply: function(target, thisArg, args) {
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if ( logLevel === true ) {
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log('trusted-replace-fetch-response:', JSON.stringify(Array.from(args)).slice(1,-1));
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}
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const fetchPromise = Reflect.apply(target, thisArg, args);
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if ( pattern === '' ) { return fetchPromise; }
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let skip = false;
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if ( propNeedles.size !== 0 ) {
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const fetchDetails = {};
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if ( args[0] instanceof self.Request ) {
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Object.assign(fetchDetails, args[0]);
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} else {
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Object.assign(fetchDetails, { url: args[0] });
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}
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if ( args[1] instanceof Object ) {
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Object.assign(fetchDetails, args[1]);
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}
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for ( const prop of Object.keys(fetchDetails) ) {
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let value = fetchDetails[prop];
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if ( typeof value !== 'string' ) {
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try { value = JSON.stringify(value); }
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catch(ex) { }
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}
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if ( typeof value !== 'string' ) { continue; }
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const needle = propNeedles.get(prop);
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if ( needle === undefined ) { continue; }
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if ( needle.test(value) ) { continue; }
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skip = true;
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break;
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}
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}
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if ( skip ) { return fetchPromise; }
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return fetchPromise.then(responseBefore => {
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return responseBefore.text().then(textBefore => {
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const textAfter = textBefore.replace(rePattern, replacement);
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const responseAfter = new Response(textAfter, {
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status: responseBefore.status,
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statusText: responseBefore.statusText,
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headers: responseBefore.headers,
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});
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Object.defineProperties(responseAfter, {
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ok: { value: responseBefore.ok },
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redirected: { value: responseBefore.redirected },
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type: { value: responseBefore.type },
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url: { value: responseBefore.url },
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});
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return responseAfter;
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}).catch(reason => {
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log('trusted-replace-fetch-response:', reason);
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return responseBefore;
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});
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});
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}
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});
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}
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/******************************************************************************/
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