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+/**
+ * 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 <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.
+ */
+
+/*
+ * 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);
+}