1 files changed, 75 insertions, 0 deletions
diff --git a/html/file_preview.js b/html/file_preview.js
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--- /dev/null
+++ b/html/file_preview.js
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+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Haketilo's preview of a file kept in IndexedDB.
+ *
+ * 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.
+ */
+
+#IMPORT common/indexeddb.js AS haketilodb
+
+#FROM html/DOM_helpers.js IMPORT by_id
+
+const error_msg = by_id("error_msg"), info_msg = by_id("info_msg");
+
+function error(msg) {
+    info_msg.remove();
+    error_msg.classList.remove("hide");
+    error_msg.innerText = msg;
+}
+
+async function show_preview(hash_key) {
+    const db = await haketilodb.get();
+    const file = await haketilodb.idb_get(db.transaction("files"),
+					  "files", hash_key);
+    if (file === undefined) {
+	error("Couldn't find file in Haketilo's internal database :(");
+    } else {
+	const blobby_opts = {type: "text/plain;charset=UTF-8"};
+	const blobby = new Blob([file.contents], blobby_opts);
+	location.replace(URL.createObjectURL(blobby));
+    }
+}
+
+const match = /^[^#]*#(.*)$/.exec(document.URL);
+if (!match) {
+    error("Bad URL :(");
+} else {
+    const hash_key = match[1];
+    show_preview(hash_key);
+}