uBlock/platform/mv3/scriptlets/scriptlet.template.js

/*******************************************************************************

    uBlock Origin Lite - a comprehensive, MV3-compliant 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

*/

/* eslint-disable indent */
/* global cloneInto */

// ruleset: $rulesetId$

/******************************************************************************/

// Important!
// Isolate from global scope

// Start of local scope
(( ) => {

/******************************************************************************/

// Start of code to inject
const uBOL_$scriptletName$ = function() {

const scriptletGlobals = {}; // eslint-disable-line

const argsList = self.$argsList$;

const hostnamesMap = new Map(self.$hostnamesMap$);

const entitiesMap = new Map(self.$entitiesMap$);

const exceptionsMap = new Map(self.$exceptionsMap$);

/******************************************************************************/

function $scriptletName$(){}

/******************************************************************************/

const hnParts = [];
try {
    let origin = document.location.origin;
    if ( origin === 'null' ) {
        const origins = document.location.ancestorOrigins;
        for ( let i = 0; i < origins.length; i++ ) {
            origin = origins[i];
            if ( origin !== 'null' ) { break; }
        }
    }
    const pos = origin.lastIndexOf('://');
    if ( pos === -1 ) { return; }
    hnParts.push(...origin.slice(pos+3).split('.'));
}
catch(ex) { }
const hnpartslen = hnParts.length;
if ( hnpartslen === 0 ) { return; }

const todoIndices = new Set();
const tonotdoIndices = [];

// Exceptions
if ( exceptionsMap.size !== 0 ) {
    for ( let i = 0; i < hnpartslen; i++ ) {
        const hn = hnParts.slice(i).join('.');
        const excepted = exceptionsMap.get(hn);
        if ( excepted ) { tonotdoIndices.push(...excepted); }
    }
    exceptionsMap.clear();
}

// Hostname-based
if ( hostnamesMap.size !== 0 ) {
    const collectArgIndices = hn => {
        let argsIndices = hostnamesMap.get(hn);
        if ( argsIndices === undefined ) { return; }
        if ( typeof argsIndices === 'number' ) { argsIndices = [ argsIndices ]; }
        for ( const argsIndex of argsIndices ) {
            if ( tonotdoIndices.includes(argsIndex) ) { continue; }
            todoIndices.add(argsIndex);
        }
    };
    for ( let i = 0; i < hnpartslen; i++ ) {
        const hn = hnParts.slice(i).join('.');
        collectArgIndices(hn);
    }
    collectArgIndices('*');
    hostnamesMap.clear();
}

// Entity-based
if ( entitiesMap.size !== 0 ) {
    const n = hnpartslen - 1;
    for ( let i = 0; i < n; i++ ) {
        for ( let j = n; j > i; j-- ) {
            const en = hnParts.slice(i,j).join('.');
            let argsIndices = entitiesMap.get(en);
            if ( argsIndices === undefined ) { continue; }
            if ( typeof argsIndices === 'number' ) { argsIndices = [ argsIndices ]; }
            for ( const argsIndex of argsIndices ) {
                if ( tonotdoIndices.includes(argsIndex) ) { continue; }
                todoIndices.add(argsIndex);
            }
        }
    }
    entitiesMap.clear();
}

// Apply scriplets
for ( const i of todoIndices ) {
    try { $scriptletName$(...argsList[i]); }
    catch(ex) {}
}
argsList.length = 0;

/******************************************************************************/

};
// End of code to inject

/******************************************************************************/

// Inject code

// https://bugzilla.mozilla.org/show_bug.cgi?id=1736575
//   'MAIN' world not yet supported in Firefox, so we inject the code into
//   'MAIN' ourself when environment in Firefox.

const targetWorld = '$world$';

// Not Firefox
if ( typeof wrappedJSObject !== 'object' || targetWorld === 'ISOLATED' ) {
    return uBOL_$scriptletName$();
}

// Firefox
{
    const page = self.wrappedJSObject;
    let script, url;
    try {
        page.uBOL_$scriptletName$ = cloneInto([
            [ '(', uBOL_$scriptletName$.toString(), ')();' ],
            { type: 'text/javascript; charset=utf-8' },
        ], self);
        const blob = new page.Blob(...page.uBOL_$scriptletName$);
        url = page.URL.createObjectURL(blob);
        const doc = page.document;
        script = doc.createElement('script');
        script.async = false;
        script.src = url;
        (doc.head || doc.documentElement || doc).append(script);
    } catch (ex) {
        console.error(ex);
    }
    if ( url ) {
        if ( script ) { script.remove(); }
        page.URL.revokeObjectURL(url);
    }
    delete page.uBOL_$scriptletName$;
}

/******************************************************************************/

// End of local scope
})();

/******************************************************************************/

void 0;