From 046b8a7b3e7259bf451926732e6221076b1d4153 Mon Sep 17 00:00:00 2001 From: Wojtek Kosior Date: Tue, 18 Jan 2022 18:55:05 +0100 Subject: facilitate caching repository responses in content scripts --- content/repo_query_cacher.js | 84 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 84 insertions(+) create mode 100644 content/repo_query_cacher.js (limited to 'content') diff --git a/content/repo_query_cacher.js b/content/repo_query_cacher.js new file mode 100644 index 0000000..bdba189 --- /dev/null +++ b/content/repo_query_cacher.js @@ -0,0 +1,84 @@ +/** + * This file is part of Haketilo. + * + * Function: Caching responses from remote repositories and serving them to + * popup pages. + * + * Copyright (C) 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 . + * + * 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. + */ + +/* + * Map URLs to objects containing parsed responses, error info or promises + * resolving to those. + */ +const cache = new Map(); + +async function perform_download(url) { + if (cache.has(url)) + return cache.get(url); + + let resolve_cb; + cache.set(url, new Promise(cb => resolve_cb = cb)); + + try { + const opts = {url, to_get: ["ok", "status"], to_call: ["json"]}; + var result = await browser.runtime.sendMessage(["CORS_bypass", opts]); + if (result === undefined) + result = {error: "Couldn't communicate with background script."}; + } catch(e) { + var result = {error: e + ""}; + } + + cache.set(url, result); + resolve_cb(result); + + return result; +} + +function on_repo_query_request([type, url], sender, respond_cb) { + if (type !== "repo_query") + return; + + perform_download(url).then(respond_cb); + + return true; +} + +function start() { + browser.runtime.onMessage.addListener(on_repo_query_request); +} -- cgit v1.2.3