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/**
* Myext serving of page actions to content scripts
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*/
/*
* IMPORTS_START
* IMPORT get_storage
* IMPORT TYPE_PREFIX
* IMPORT CONNECTION_TYPE
* IMPORT browser
* IMPORT listen_for_connection
* IMPORT sha256
* IMPORT get_query_best
* IMPORTS_END
*/
var storage;
var query_best;
var handler;
function send_scripts(url, port)
{
let [pattern, settings] = query_best(url);
if (settings === undefined)
return;
let components = settings.components;
let processed_bags = new Set();
if (components !== undefined)
send_scripts_rec([components], port, processed_bags);
}
// TODO: parallelize script fetching
async function send_scripts_rec(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_rec(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);
}
}
function ajax_callback()
{
if (this.readyState == 4)
this.resolve_callback(this);
}
function initiate_ajax_request(resolve, method, url)
{
var xhttp = new XMLHttpRequest();
xhttp.resolve_callback = resolve;
xhttp.onreadystatechange = ajax_callback;
xhttp.open(method, url, true);
xhttp.send();
}
function make_ajax_request(method, url)
{
return new Promise((resolve, reject) =>
initiate_ajax_request(resolve, method, url));
}
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]);
let url = message.url;
console.log({url});
send_scripts(url, port);
}
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_page_actions_server()
{
storage = await get_storage();
query_best = await get_query_best();
listen_for_connection(CONNECTION_TYPE.PAGE_ACTIONS, new_connection);
}
/*
* EXPORTS_START
* EXPORT start_page_actions_server
* EXPORTS_END
*/
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