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/**
* This file is part of Haketilo.
*
* Function: Instantiate the Pattern Tree data structure, filled with mappings
* from IndexedDB.
*
* Copyright (C) 2021,2022 Wojtek Kosior
*
* 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.
*
* As additional permission under GNU GPL version 3 section 7, you
* may distribute forms of that code without the copy of the GNU
* GPL normally required by section 4, provided you include this
* license notice and, in case of non-source distribution, a URL
* through which recipients can access the Corresponding Source.
* If you modify file(s) with this exception, you may extend this
* exception to your version of the file(s), but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* As a special exception to the GPL, any HTML file which merely
* makes function calls to this code, and for that purpose
* includes it by reference shall be deemed a separate work for
* copyright law purposes. If you modify this code, you may extend
* this exception to your version of the code, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* I, Wojtek Kosior, thereby promise not to sue for violation of this file's
* license. Although I request that you do not make use of this code in a
* proprietary program, I am not going to enforce this in court.
*/
#IMPORT common/patterns_query_tree.js AS pqt
#IMPORT common/indexeddb.js AS haketilodb
#IF MOZILLA || MV3
#FROM common/browser.js IMPORT browser
#ENDIF
let secret;
const tree = pqt.make();
#EXPORT tree
const currently_registered = new Map();
#IF MOZILLA || MV3
let registered_script = null;
let script_update_occuring = false;
let script_update_needed;
async function update_content_script()
{
if (script_update_occuring)
return;
script_update_occuring = true;
while (script_update_needed) {
script_update_needed = false;
const code = `\
this.haketilo_secret = ${secret};
this.haketilo_pattern_tree = ${JSON.stringify(tree)};
if (this.haketilo_content_script_main)
haketilo_content_script_main();`;
const new_script = await browser.contentScripts.register({
"js": [{code}],
"matches": ["<all_urls>"],
"allFrames": true,
"runAt": "document_start"
});
if (registered_script)
registered_script.unregister();
registered_script = new_script;
}
script_update_occuring = false;
}
#ENDIF
function register(kind, object)
{
if (kind === "mappings") {
for (const [pattern, resource] of Object.entries(object.payloads))
pqt.register(tree, pattern, object.identifier, resource);
} else /* if (kind === "blocking") */ {
/*
* All simple block/allow rules use "~allow" in place of mapping id.
* This way it won't collide with any real mapping id and will always
* be sorted as higher value than mapping ids.
*/
pqt.register(tree, object.pattern, "~allow", object.allow + 0);
}
#IF MOZILLA || MV3
const id = kind === "mappings" ? object.identifier : object.pattern;
currently_registered.set(id, object);
#ENDIF
}
function changed(kind, change)
{
const old_version = currently_registered.get(change.key);
if (old_version !== undefined) {
if (kind === "mappings") {
for (const pattern in old_version.payloads)
pqt.deregister(tree, pattern, change.key);
} else /* if (kind === "blocking") */ {
pqt.deregister(tree, change.key, "~allow");
}
#IF MOZILLA || MV3
currently_registered.delete(change.key);
#ENDIF
}
if (change.new_val !== undefined)
register(kind, change.new_val);
#IF MOZILLA || MV3
script_update_needed = true;
setTimeout(update_content_script, 0);
#ENDIF
}
async function start(secret_)
{
secret = secret_;
const [mapping_tracking, initial_mappings] =
await haketilodb.track.mappings(ch => changed("mappings", ch));
const [blocking_tracking, initial_blocking] =
await haketilodb.track.blocking(ch => changed("blocking", ch));
initial_mappings.forEach(m => register("mappings", m));
initial_blocking.forEach(b => register("blocking", b));
#IF MOZILLA || MV3
script_update_needed = true;
await update_content_script();
#ENDIF
}
#EXPORT start
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