Haketilo

/**

 * Hachette display panel logic

 *

 * Copyright (C) 2021 Wojtek Kosior

 * Redistribution terms are gathered in the `copyright' file.

 */

/*

 * IMPORTS_START

 * IMPORT browser

 * IMPORT is_chrome

 * IMPORT is_mozilla

 *** Using remote storage here seems inefficient, we only resort to that

 *** temporarily, before all storage access gets reworked.

 * IMPORT get_remote_storage

 * IMPORT get_import_frame

 * IMPORT query_all

 * IMPORT CONNECTION_TYPE

 * IMPORT is_privileged_url

 * IMPORT TYPE_PREFIX

 * IMPORT nice_name

 * IMPORT open_in_settings

 * IMPORT for_each_possible_pattern

 * IMPORT by_id

 * IMPORT clone_template

 * IMPORTS_END

 */

let storage;

let tab_url;

const tab_query = {currentWindow: true, active: true};

async function get_current_tab()

{

    /* Fix for fact that Chrome does not use promises here */

    const promise = is_chrome ?

	  new Promise((resolve, reject) =>

		      browser.tabs.query(tab_query, tab => resolve(tab))) :

	  browser.tabs.query(tab_query);

    try {

	return (await promise)[0];

    } catch(e) {

	console.log(e);

    }

}

const page_url_heading = by_id("page_url_heading");

const show_privileged_notice_chbx = by_id("show_privileged_notice_chbx");

const show_page_state_chbx = by_id("show_page_state_chbx");

async function show_page_activity_info()

{

    const tab = await get_current_tab();

    if (tab === undefined) {

	page_url_heading.textContent = "unknown page";

	return;

    }

    tab_url = /^([^?#]*)/.exec(tab.url)[1];

    page_url_heading.textContent = tab_url;

    if (is_privileged_url(tab_url)) {

	show_privileged_notice_chbx.checked = true;

	return;

    }

    populate_possible_patterns_list(tab_url);

    show_page_state_chbx.checked = true;

    try_to_connect(tab.id);

}

const possible_patterns_ul = by_id("possible_patterns");

const pattern_li_template = by_id("pattern_li_template");

pattern_li_template.removeAttribute("id");

const known_patterns = new Map();

function add_pattern_to_list(pattern)

{

    const li = pattern_li_template.cloneNode(true);

    li.id = `pattern_li_${known_patterns.size}`;

    known_patterns.set(pattern, li.id);

    const span = li.firstElementChild;

    span.textContent = pattern;

    const button = span.nextElementSibling;

    const settings_opener = () => open_in_settings(TYPE_PREFIX.PAGE, pattern);

    button.addEventListener("click", settings_opener);

    possible_patterns_ul.appendChild(li)

    return li.id;

}

function ensure_pattern_exists(pattern)

{

    let id = known_patterns.get(pattern);

    /*

     * As long as pattern computation works well, we should never get into this

     * conditional block. This is just a safety measure. To be removed as part

     * of a bigger rework when we start taking iframes into account.

     */

    if (id === undefined) {

	console.log(`unknown pattern: ${pattern}`);

	id = add_pattern_to_list(pattern);

    }

    return id;

}

function set_pattern_li_button_text(li_id, text)

{

    by_id(li_id).firstElementChild.nextElementSibling.textContent = text;

}

function handle_page_change(change)

{

    const li_id = ensure_pattern_exists(change.item);

    if (change.old_val === undefined)

	set_pattern_li_button_text(li_id, "Edit in settings");

    if (change.new_val === undefined)

	set_pattern_li_button_text(li_id, "Add setting");

}

function populate_possible_patterns_list(url)

{

    for_each_possible_pattern(url, add_pattern_to_list);

    for (const [pattern, settings] of query_all(storage, url)) {

	set_pattern_li_button_text(ensure_pattern_exists(pattern),

				   "Edit in settings");

    }

    storage.add_change_listener(handle_page_change, [TYPE_PREFIX.PAGE]);

}

const connected_chbx = by_id("connected_chbx");

const query_pattern_but = by_id("query_pattern");

var content_script_port;

function try_to_connect(tab_id)

{

    /* This won't connect to iframes. We'll add support for them later */

    const connect_info = {name: CONNECTION_TYPE.ACTIVITY_INFO, frameId: 0};

    content_script_port = browser.tabs.connect(tab_id, connect_info);

    const disconnect_cb = () => handle_disconnect(tab_id, start_querying_repos);

    content_script_port.onDisconnect.addListener(disconnect_cb);

    content_script_port.onMessage.addListener(handle_activity_report);

    query_pattern_but.addEventListener("click", start_querying_repos);

    if (is_mozilla)

	setTimeout(() => monitor_connecting(tab_id), 1000);

}

const query_started_chbx = by_id("query_started_chbx");

function start_querying_repos(port)

{

    const repo_urls = storage.get_all_names(TYPE_PREFIX.REPO);

    if (content_script_port)

	content_script_port.postMessage([TYPE_PREFIX.URL, tab_url, repo_urls]);

    query_started_chbx.checked = true;

}

const loading_chbx = by_id("loading_chbx");

function handle_disconnect(tab_id, button_cb)

{

    query_pattern_but.removeEventListener("click", button_cb);

    content_script_port = null;

    if (is_chrome && !browser.runtime.lastError)

	return;

    /* return if error was not during connection initialization */

    if (connected_chbx.checked)

	return;

    loading_chbx.checked = !loading_chbx.checked;

    setTimeout(() => try_to_connect(tab_id), 1000);

}

function monitor_connecting(tab_id)

{

    if (connected_chbx.checked)

	return;

    if (content_script_port)

	content_script_port.disconnect();

    else

	return;

    loading_chbx.checked = !loading_chbx.checked;

    try_to_connect(tab_id);

}

const pattern_span = by_id("pattern");

const view_pattern_but = by_id("view_pattern");

const blocked_span = by_id("blocked");

const payload_span = by_id("payload");

const view_payload_but = by_id("view_payload");

const container_for_injected = by_id("container_for_injected");

const queried_items = new Map();

function handle_activity_report(message)

{

    connected_chbx.checked = true;

    const [type, data] = message;

    if (type === "settings") {

	let [pattern, settings] = data;

	settings = settings || {};

	blocked_span.textContent = settings.allow ? "no" : "yes";

	if (pattern) {

	    pattern_span.textContent = pattern;

	    const settings_opener =

		  () => open_in_settings(TYPE_PREFIX.PAGE, pattern);

	    view_pattern_but.classList.remove("hide");

	    view_pattern_but.addEventListener("click", settings_opener);

	} else {

	    pattern_span.textContent = "none";

	}

	const components = settings.components;

	if (components) {

	    payload_span.textContent = nice_name(...components);

	    const settings_opener = () => open_in_settings(...components);

	    view_payload_but.classList.remove("hide");

	    view_payload_but.addEventListener("click", settings_opener);

	} else {

	    payload_span.textContent = "none";

	}

    }

    if (type === "script") {

	const h4 = document.createElement("h4");

	const pre = document.createElement("pre");

	h4.textContent = "script";

	pre.textContent = data;

	container_for_injected.appendChild(h4);

	container_for_injected.appendChild(pre);

    }

    if (type === "repo_query_action") {

	query_started_chbx.checked = true;

	const key = data.prefix + data.item;

	const results = queried_items.get(key) || {};

	Object.assign(results, data.results);

	queried_items.set(key, results);

	const action = data.prefix === TYPE_PREFIX.URL ?

	      show_query_result : record_fetched_install_dep;

	for (const [repo_url, result] of Object.entries(data.results))

	    action(data.prefix, data.item, repo_url, result);

    }

}

const container_for_repo_responses = by_id("container_for_repo_responses");

const results_lists = new Map();

function create_results_list(url)

{

    const list_div = document.createElement("div");

    const list_head = document.createElement("h4");

    const list = document.createElement("ul");

    list_head.textContent = url;

    list_div.appendChild(list_head);

    list_div.appendChild(list);

    container_for_repo_responses.appendChild(list_div);

    const list_object = {list, by_repo: new Map()};

    results_lists.set(url, list_object);

    return list_object;

}

function create_result_item(list_object, repo_url, result)

{

    const result_li = document.createElement("li");

    const repo_url_span = document.createElement("span");

    const result_item = {result_li, appended: null};

    repo_url_span.textContent = repo_url;

    result_li.appendChild(repo_url_span);

    list_object.list.appendChild(result_li);

    list_object.by_repo.set(repo_url, result_item);

    return result_item;

}

function set_appended(result_item, element)

{

    if (result_item.appended)

	result_item.appended.remove();

    result_item.appended = element;

    result_item.result_li.appendChild(element);

}

function show_message(result_item, text)

{

    const div = document.createElement("div");

    div.textContent = text;

    set_appended(result_item, div);

}

function showcb(text)

{

    return item => show_message(item, text);

}

function unroll_chbx_first_checked(entry_object)

{

    if (!entry_object.chbx.checked)

	return;

    entry_object.chbx.removeEventListener("change", entry_object.unroll_cb);

    delete entry_object.unroll_cb;

    entry_object.unroll.textContent = "preview not implemented...";

}

const show_install_chbx = by_id("show_install_view_chbx");

let import_frame;

let install_target = null;

function install_abort(error_state)

{

    import_frame.show_error(`Error: ${error_state}`);

    install_target = null;

}

/*

 * Translate objects from the format in which they are sent by Hydrilla to the

 * format in which they are stored in settings.

 */

function translate_script(script_object, repo_url)

{

    return {

	[TYPE_PREFIX.SCRIPT + script_object.name]: {

	    hash: script_object.sha256,

	    url: `${repo_url}/content/${script_object.location}`

	}

    };

}

function translate_bag(bag_object)

{

    return {

	[TYPE_PREFIX.BAG + bag_object.name]: bag_object.components

    };

}

const format_translators = {

    [TYPE_PREFIX.BAG]: translate_bag,

    [TYPE_PREFIX.SCRIPT]: translate_script

};

function install_check_ready()

{

    if (install_target.to_fetch.size > 0)

	return;

    const page_key = [TYPE_PREFIX.PAGE + install_target.pattern];

    const to_install = [{[page_key]: {components: install_target.payload}}];

    for (const key of install_target.fetched) {

	const old_object =

	      queried_items.get(key)[install_target.repo_url].response;

	const new_object =

	      format_translators[key[0]](old_object, install_target.repo_url);

	to_install.push(new_object);

    }

    import_frame.show_selection(to_install);

}

const possible_errors = ["connection_error", "parse_error"];

function fetch_install_deps(components)

{

    const needed = [...components];

    const processed = new Set();

    while (needed.length > 0) {

	const [prefix, item] = needed.pop();

	const key = prefix + item;

	processed.add(key);

	const results = queried_items.get(key);

	let relevant_result = null;

	if (results)

	    relevant_result = results[install_target.repo_url];

	if (!relevant_result) {

	    content_script_port.postMessage([prefix, item,

					     [install_target.repo_url]]);

	    install_target.to_fetch.add(key);

	    continue;

	}

	if (possible_errors.includes(relevant_result.state)) {

	    install_abort(relevant_result.state);

	    return false;

	}

	install_target.fetched.add(key);

	if (prefix !== TYPE_PREFIX.BAG)

	    continue;

	for (const dependency of relevant_result.response.components) {

	    if (processed.has(dependency.join('')))

		continue;

	    needed.push(dependency);

	}

    }

}

function record_fetched_install_dep(prefix, item, repo_url, result)

{

    const key = prefix + item;

    if (!install_target || repo_url !== install_target.repo_url ||

	!install_target.to_fetch.has(key))

	return;

    if (possible_errors.includes(result.state)) {

	install_abort(result.state);

	return;

    }

    if (result.state !== "completed")

	return;

    install_target.to_fetch.delete(key);

    install_target.fetched.add(key);

    if (prefix === TYPE_PREFIX.BAG &&

	fetch_install_deps(result.response.components) === false)

	return;

    install_check_ready();

}

function install_clicked(entry_object)

{

    show_install_chbx.checked = true;

    import_frame.show_loading();

    install_target = {

	repo_url: entry_object.repo_url,

	pattern: entry_object.match_object.pattern,

	payload: entry_object.match_object.payload,

	fetched: new Set(),

	to_fetch: new Set()

    };

    fetch_install_deps([install_target.payload]);

    install_check_ready();

}

var max_query_result_id = 0;

function show_query_successful_result(result_item, repo_url, result)

{

    const ul = document.createElement("ul");

    set_appended(result_item, ul);

    for (const match of result) {

	const entry_object = clone_template("query_match_li_template");

	entry_object.pattern.textContent = match.pattern;

	ul.appendChild(entry_object.li);

	if (!match.payload) {

	    entry_object.payload.textContent = "(none)";

	    for (const key of ["chbx", "br", "triangle", "unroll"])

		entry_object[key].remove();

	    continue;

	}

	entry_object.component.textContent = nice_name(...match.payload);

	const install_cb = () => install_clicked(entry_object);

	entry_object.btn.addEventListener("click", install_cb);

	const chbx_id = `query_result_${max_query_result_id++}`;

	entry_object.chbx.id = chbx_id;

	entry_object.lbl.setAttribute("for", chbx_id);

	entry_object.unroll_cb = () => unroll_chbx_first_checked(entry_object);

	entry_object.chbx.addEventListener("change", entry_object.unroll_cb);

	entry_object.component_object = match.payload;

	entry_object.match_object = match;

	entry_object.repo_url = repo_url;

    }

}

function show_query_result(url_prefix, url, repo_url, result)

{

    const results_list_object = results_lists.get(url) ||

	  create_results_list(url);

    const result_item = results_list_object.by_repo.get(repo_url) ||

	  create_result_item(results_list_object, repo_url, result);

    const completed_cb =

	  item => show_query_successful_result(item, repo_url, result.response);

    const possible_actions = {

	completed: completed_cb,

	started: showcb("loading..."),

	connection_error: showcb("Error when querying repository."),

	parse_error: showcb("Bad data format received.")

    };

    possible_actions[result.state](result_item, repo_url);

}

by_id("settings_but")

    .addEventListener("click", (e) => browser.runtime.openOptionsPage());

async function main()

{

    storage = await get_remote_storage();

    import_frame = await get_import_frame();

    import_frame.onclose = () => show_install_chbx.checked = false;

    show_page_activity_info();

}

main();