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/**
* This file is part of Haketilo.
*
* Function: Serving page actions to content scripts.
*
* Copyright (C) 2021 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/storage_light.js AS light_storage
#IMPORT common/connection_types.js AS CONNECTION_TYPE
#FROM common/browser.js IMPORT browser
#FROM common/message_server.js IMPORT listen_for_connection
#FROM background/storage.js IMPORT get_storage
#FROM common/stored_types.js IMPORT TYPE_PREFIX
#FROM common/sha256.js IMPORT sha256
#FROM common/ajax.js IMPORT make_ajax_request
var storage;
var handler;
// TODO: parallelize script fetching
async function send_scripts(components, port, processed_bags)
{
for (let [prefix, name] of components) {
if (prefix === TYPE_PREFIX.BAG) {
if (processed_bags.has(name)) {
console.log(`preventing recursive inclusion of bag ${name}`);
continue;
}
var bag = storage.get(TYPE_PREFIX.BAG, name);
if (bag === undefined) {
console.log(`no bag in storage for key ${name}`);
continue;
}
processed_bags.add(name);
await send_scripts(bag, port, processed_bags);
processed_bags.delete(name);
} else {
let script_text = await get_script_text(name);
if (script_text === undefined)
continue;
port.postMessage(["inject", [script_text]]);
}
}
}
async function get_script_text(script_name)
{
try {
let script_data = storage.get(TYPE_PREFIX.SCRIPT, script_name);
if (script_data === undefined) {
console.log(`missing data for ${script_name}`);
return;
}
let script_text = script_data.text;
if (!script_text)
script_text = await fetch_remote_script(script_data);
return script_text;
} catch (e) {
console.log(e);
}
}
async function fetch_remote_script(script_data)
{
try {
let xhttp = await make_ajax_request("GET", script_data.url);
if (xhttp.status === 200) {
let computed_hash = sha256(xhttp.responseText);
if (computed_hash !== script_data.hash) {
console.log(`Bad hash for ${script_data.url}\n got ${computed_hash} instead of ${script_data.hash}`);
return;
}
return xhttp.responseText;
} else {
console.log("script not fetched: " + script_data.url);
return;
}
} catch (e) {
console.log(e);
}
}
function handle_message(port, message, handler)
{
port.onMessage.removeListener(handler[0]);
console.debug(`Loading payload '${message.payload}'.`);
const processed_bags = new Set();
send_scripts([message.payload], port, processed_bags);
}
function new_connection(port)
{
console.log("new page actions connection!");
let handler = [];
handler.push(m => handle_message(port, m, handler));
port.onMessage.addListener(handler[0]);
}
async function start()
{
storage = await get_storage();
listen_for_connection(CONNECTION_TYPE.PAGE_ACTIONS, new_connection);
}
#EXPORT start
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