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Improve prevent-fetch scriptlet
Related issue: https://github.com/uBlockOrigin/uBlock-issues/issues/2526 Improvements: Support fulfilling the response with the content of a `web_accessible_resources` resource, using the syntax already supported by `prevent-xhr`: `war:[name of resource]` Support fulfilling the response with randomized text with length specified using `length:min[-max]` directive.
This commit is contained in:
Raymond Hill
parent
74f54d0633
commit
6aeab2adbc
1 changed files with 85 additions and 44 deletions
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@ -52,6 +52,8 @@ function safeSelf() {
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'Function_toStringFn': self.Function.prototype.toString,
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'Function_toString': thisArg => safe.Function_toStringFn.call(thisArg),
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'Math_floor': Math.floor,
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'Math_max': Math.max,
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'Math_min': Math.min,
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'Math_random': Math.random,
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'Object_defineProperty': Object.defineProperty.bind(Object),
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'RegExp': self.RegExp,
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@ -242,6 +244,64 @@ function runAtHtmlElementFn(fn) {
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/******************************************************************************/
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// Reference:
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// https://github.com/AdguardTeam/Scriptlets/blob/master/wiki/about-scriptlets.md#prevent-xhr
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builtinScriptlets.push({
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name: 'generate-content.fn',
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fn: generateContentFn,
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dependencies: [
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'safe-self.fn',
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],
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});
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function generateContentFn(directive) {
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const safe = safeSelf();
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const randomize = len => {
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const chunks = [];
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let textSize = 0;
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do {
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const s = safe.Math_random().toString(36).slice(2);
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chunks.push(s);
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textSize += s.length;
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}
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while ( textSize < len );
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return chunks.join(' ').slice(0, len);
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};
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if ( directive === 'true' ) {
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return Promise.resolve(randomize(10));
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}
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if ( directive.startsWith('length:') ) {
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const match = /^length:(\d+)(?:-(\d+))?$/.exec(directive);
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if ( match ) {
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const min = parseInt(match[1], 10);
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const extent = safe.Math_max(parseInt(match[2], 10) || 0, min) - min;
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const len = safe.Math_min(min + extent * safe.Math_random(), 500000);
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return Promise.resolve(randomize(len | 0));
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}
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}
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if ( directive.startsWith('war:') && scriptletGlobals.has('warOrigin') ) {
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return new Promise(resolve => {
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const warOrigin = scriptletGlobals.get('warOrigin');
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const warName = directive.slice(4);
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const fullpath = [ warOrigin, '/', warName ];
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const warSecret = scriptletGlobals.get('warSecret');
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if ( warSecret !== undefined ) {
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fullpath.push('?secret=', warSecret);
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}
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const warXHR = new safe.XMLHttpRequest();
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warXHR.responseType = 'text';
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warXHR.onloadend = ev => {
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resolve(ev.target.responseText || '');
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};
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warXHR.open('GET', fullpath.join(''));
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warXHR.send();
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});
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}
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return Promise.resolve('');
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}
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/******************************************************************************/
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builtinScriptlets.push({
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name: 'abort-current-script-core.fn',
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fn: abortCurrentScriptCore,
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@ -1757,16 +1817,18 @@ builtinScriptlets.push({
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],
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fn: noFetchIf,
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dependencies: [
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'generate-content.fn',
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'safe-self.fn',
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],
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});
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function noFetchIf(
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arg1 = '',
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propsToMatch = '',
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directive = ''
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) {
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if ( typeof arg1 !== 'string' ) { return; }
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if ( typeof propsToMatch !== 'string' ) { return; }
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const safe = safeSelf();
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const needles = [];
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for ( const condition of arg1.split(/\s+/) ) {
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for ( const condition of propsToMatch.split(/\s+/) ) {
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if ( condition === '' ) { continue; }
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const pos = condition.indexOf(':');
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let key, value;
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@ -1782,14 +1844,11 @@ function noFetchIf(
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const log = needles.length === 0 ? console.log.bind(console) : undefined;
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self.fetch = new Proxy(self.fetch, {
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apply: function(target, thisArg, args) {
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const details = args[0] instanceof self.Request
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? args[0]
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: Object.assign({ url: args[0] }, args[1]);
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let proceed = true;
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try {
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let details;
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if ( args[0] instanceof self.Request ) {
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details = args[0];
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} else {
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details = Object.assign({ url: args[0] }, args[1]);
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}
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const props = new Map();
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for ( const prop in details ) {
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let v = details[prop];
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@ -1818,9 +1877,21 @@ function noFetchIf(
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}
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} catch(ex) {
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}
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return proceed
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? Reflect.apply(target, thisArg, args)
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: Promise.resolve(new Response());
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if ( proceed ) {
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return Reflect.apply(target, thisArg, args);
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}
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return generateContentFn(directive).then(text => {
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const response = new Response(text, {
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statusText: 'OK',
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headers: {
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'Content-Length': text.length,
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}
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});
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Object.defineProperty(response, 'url', {
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value: details.url
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});
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return response;
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});
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}
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});
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}
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@ -2259,6 +2330,7 @@ builtinScriptlets.push({
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],
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fn: noXhrIf,
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dependencies: [
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'generate-content.fn',
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'match-object-properties.fn',
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'parse-properties-to-match.fn',
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'safe-self.fn',
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@ -2269,41 +2341,10 @@ function noXhrIf(
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directive = ''
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) {
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if ( typeof propsToMatch !== 'string' ) { return; }
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const safe = safeSelf();
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const xhrInstances = new WeakMap();
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const propNeedles = parsePropertiesToMatch(propsToMatch, 'url');
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const log = propNeedles.size === 0 ? console.log.bind(console) : undefined;
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const warOrigin = scriptletGlobals.get('warOrigin');
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const generateRandomString = len => {
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let s = '';
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do { s += safe.Math_random().toString(36).slice(2); }
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while ( s.length < 10 );
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return s.slice(0, len);
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};
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const generateContent = async directive => {
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if ( directive === 'true' ) {
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return generateRandomString(10);
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}
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if ( directive.startsWith('war:') ) {
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if ( warOrigin === undefined ) { return ''; }
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return new Promise(resolve => {
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const warName = directive.slice(4);
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const fullpath = [ warOrigin, '/', warName ];
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const warSecret = scriptletGlobals.get('warSecret');
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if ( warSecret !== undefined ) {
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fullpath.push('?secret=', warSecret);
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}
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const warXHR = new safe.XMLHttpRequest();
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warXHR.responseType = 'text';
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warXHR.onloadend = ev => {
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resolve(ev.target.responseText || '');
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};
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warXHR.open('GET', fullpath.join(''));
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warXHR.send();
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});
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}
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return '';
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};
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self.XMLHttpRequest = class extends self.XMLHttpRequest {
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open(method, url, ...args) {
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if ( log !== undefined ) {
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@ -2370,7 +2411,7 @@ function noXhrIf(
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default:
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if ( directive === '' ) { break; }
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promise = promise.then(details => {
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return generateContent(details.directive).then(text => {
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return generateContentFn(details.directive).then(text => {
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details.props.response.value = text;
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details.props.responseText.value = text;
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return details;
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