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/**
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* Myext serving of page actions to content scripts
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*
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* Copyright (C) 2021 Wojtek Kosior
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* Redistribution terms are gathered in the `copyright' file.
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*/
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/*
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* IMPORTS_START
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* IMPORT get_storage
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* IMPORT TYPE_PREFIX
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* IMPORT CONNECTION_TYPE
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* IMPORT browser
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* IMPORT listen_for_connection
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* IMPORT sha256
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* IMPORT get_query_best
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* IMPORTS_END
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*/
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var storage;
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var query_best;
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var handler;
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function send_scripts(url, port)
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{
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let [pattern, settings] = query_best(url);
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if (settings === undefined)
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return;
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let components = settings.components;
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let processed_bags = new Set();
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if (components !== undefined)
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send_scripts_rec([components], port, processed_bags);
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}
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// TODO: parallelize script fetching
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async function send_scripts_rec(components, port, processed_bags)
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{
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for (let [prefix, name] of components) {
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if (prefix === TYPE_PREFIX.BAG) {
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if (processed_bags.has(name)) {
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console.log(`preventing recursive inclusion of bag ${name}`);
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continue;
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}
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var bag = storage.get(TYPE_PREFIX.BAG, name);
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if (bag === undefined) {
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console.log(`no bag in storage for key ${name}`);
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continue;
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}
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processed_bags.add(name);
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await send_scripts_rec(bag, port, processed_bags);
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processed_bags.delete(name);
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} else {
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let script_text = await get_script_text(name);
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if (script_text === undefined)
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continue;
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port.postMessage({inject : [script_text]});
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}
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}
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}
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async function get_script_text(script_name)
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{
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try {
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let script_data = storage.get(TYPE_PREFIX.SCRIPT, script_name);
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if (script_data === undefined) {
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console.log(`missing data for ${script_name}`);
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return;
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}
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let script_text = script_data.text;
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if (!script_text)
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script_text = await fetch_remote_script(script_data);
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return script_text;
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} catch (e) {
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console.log(e);
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}
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}
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function ajax_callback()
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{
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if (this.readyState == 4)
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this.resolve_callback(this);
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}
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function initiate_ajax_request(resolve, method, url)
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{
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var xhttp = new XMLHttpRequest();
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xhttp.resolve_callback = resolve;
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xhttp.onreadystatechange = ajax_callback;
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xhttp.open(method, url, true);
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xhttp.send();
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}
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function make_ajax_request(method, url)
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{
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return new Promise((resolve, reject) =>
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initiate_ajax_request(resolve, method, url));
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}
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async function fetch_remote_script(script_data)
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{
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try {
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let xhttp = await make_ajax_request("GET", script_data.url);
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if (xhttp.status === 200) {
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let computed_hash = sha256(xhttp.responseText);
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if (computed_hash !== script_data.hash) {
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console.log(`Bad hash for ${script_data.url}\n got ${computed_hash} instead of ${script_data.hash}`);
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return;
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}
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return xhttp.responseText;
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} else {
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console.log("script not fetched: " + script_data.url);
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return;
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}
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} catch (e) {
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console.log(e);
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}
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}
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function handle_message(port, message, handler)
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{
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port.onMessage.removeListener(handler[0]);
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let url = message.url;
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console.log({url});
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send_scripts(url, port);
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}
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function new_connection(port)
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{
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console.log("new page actions connection!");
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let handler = [];
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handler.push(m => handle_message(port, m, handler));
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port.onMessage.addListener(handler[0]);
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}
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async function start_page_actions_server()
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{
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storage = await get_storage();
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query_best = await get_query_best();
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listen_for_connection(CONNECTION_TYPE.PAGE_ACTIONS, new_connection);
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}
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/*
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* EXPORTS_START
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151
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* EXPORT start_page_actions_server
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* EXPORTS_END
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153
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*/
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