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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2019-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
*/
import { registerScriptlet } from './base.js';
import { safeSelf } from './safe-self.js';
// Externally added to the private namespace in which scriptlets execute.
/* global scriptletGlobals */
/******************************************************************************/
export function getRandomTokenFn() {
const safe = safeSelf();
return safe.String_fromCharCode(Date.now() % 26 + 97) +
safe.Math_floor(safe.Math_random() * 982451653 + 982451653).toString(36);
}
registerScriptlet(getRandomTokenFn, {
name: 'get-random-token.fn',
dependencies: [
safeSelf,
],
});
/******************************************************************************/
export function getExceptionTokenFn() {
const token = getRandomTokenFn();
const oe = self.onerror;
self.onerror = function(msg, ...args) {
if ( typeof msg === 'string' && msg.includes(token) ) { return true; }
if ( oe instanceof Function ) {
return oe.call(this, msg, ...args);
}
}.bind();
return token;
}
registerScriptlet(getExceptionTokenFn, {
name: 'get-exception-token.fn',
dependencies: [
getRandomTokenFn,
],
});
/******************************************************************************/
export function parsePropertiesToMatchFn(propsToMatch, implicit = '') {
const safe = safeSelf();
const needles = new Map();
if ( propsToMatch === undefined || propsToMatch === '' ) { return needles; }
const options = { canNegate: true };
for ( const needle of safe.String_split.call(propsToMatch, /\s+/) ) {
let [ prop, pattern ] = safe.String_split.call(needle, ':');
if ( prop === '' ) { continue; }
if ( pattern !== undefined && /[^$\w -]/.test(prop) ) {
prop = `${prop}:${pattern}`;
pattern = undefined;
}
if ( pattern !== undefined ) {
needles.set(prop, safe.initPattern(pattern, options));
} else if ( implicit !== '' ) {
needles.set(implicit, safe.initPattern(prop, options));
}
}
return needles;
}
registerScriptlet(parsePropertiesToMatchFn, {
name: 'parse-properties-to-match.fn',
dependencies: [
safeSelf,
],
});
/******************************************************************************/
export function matchObjectPropertiesFn(propNeedles, ...objs) {
const safe = safeSelf();
const matched = [];
for ( const obj of objs ) {
if ( obj instanceof Object === false ) { continue; }
for ( const [ prop, details ] of propNeedles ) {
let value = obj[prop];
if ( value === undefined ) { continue; }
if ( typeof value !== 'string' ) {
try { value = safe.JSON_stringify(value); }
catch { }
if ( typeof value !== 'string' ) { continue; }
}
if ( safe.testPattern(details, value) === false ) { return; }
matched.push(`${prop}: ${value}`);
}
}
return matched;
}
registerScriptlet(matchObjectPropertiesFn, {
name: 'match-object-properties.fn',
dependencies: [
safeSelf,
],
});
/******************************************************************************/
// Reference:
// https://github.com/AdguardTeam/Scriptlets/blob/master/wiki/about-scriptlets.md#prevent-xhr
//
// Added `trusted` argument to allow for returning arbitrary text. Can only
// be used through scriptlets requiring trusted source.
export function generateContentFn(trusted, directive) {
const safe = safeSelf();
const randomize = len => {
const chunks = [];
let textSize = 0;
do {
const s = safe.Math_random().toString(36).slice(2);
chunks.push(s);
textSize += s.length;
}
while ( textSize < len );
return chunks.join(' ').slice(0, len);
};
if ( directive === 'true' ) {
return randomize(10);
}
if ( directive === 'emptyObj' ) {
return '{}';
}
if ( directive === 'emptyArr' ) {
return '[]';
}
if ( directive === 'emptyStr' ) {
return '';
}
if ( directive.startsWith('length:') ) {
const match = /^length:(\d+)(?:-(\d+))?$/.exec(directive);
if ( match === null ) { return ''; }
const min = parseInt(match[1], 10);
const extent = safe.Math_max(parseInt(match[2], 10) || 0, min) - min;
const len = safe.Math_min(min + extent * safe.Math_random(), 500000);
return randomize(len | 0);
}
if ( directive.startsWith('war:') ) {
if ( scriptletGlobals.warOrigin === undefined ) { return ''; }
return new Promise(resolve => {
const warOrigin = scriptletGlobals.warOrigin;
const warName = directive.slice(4);
const fullpath = [ warOrigin, '/', warName ];
const warSecret = scriptletGlobals.warSecret;
if ( warSecret !== undefined ) {
fullpath.push('?secret=', warSecret);
}
const warXHR = new safe.XMLHttpRequest();
warXHR.responseType = 'text';
warXHR.onloadend = ev => {
resolve(ev.target.responseText || '');
};
warXHR.open('GET', fullpath.join(''));
warXHR.send();
}).catch(( ) => '');
}
if ( trusted ) {
return directive;
}
return '';
}
registerScriptlet(generateContentFn, {
name: 'generate-content.fn',
dependencies: [
safeSelf,
],
});
/******************************************************************************/
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