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authorWojtek Kosior <koszko@koszko.org>2021-12-27 16:55:28 +0100
committerWojtek Kosior <koszko@koszko.org>2021-12-27 16:55:28 +0100
commit01e977f922ea29cd2994f96c18e4b3f033b1802d (patch)
tree0c5b3ceb13bf364c209ef097644d81e6e04ea91d /background
parentb590eaa2f64ead3384eadc6fe58f6358aa1a0478 (diff)
downloadbrowser-extension-01e977f922ea29cd2994f96c18e4b3f033b1802d.tar.gz
browser-extension-01e977f922ea29cd2994f96c18e4b3f033b1802d.zip
facilitate egistering dynamic content scripts with mappings data
Diffstat (limited to 'background')
-rw-r--r--background/broadcast_broker.js1
-rw-r--r--background/patterns_query_manager.js124
2 files changed, 124 insertions, 1 deletions
diff --git a/background/broadcast_broker.js b/background/broadcast_broker.js
index 9847d7e..5af3a7b 100644
--- a/background/broadcast_broker.js
+++ b/background/broadcast_broker.js
@@ -141,7 +141,6 @@ function prepare_timeout_cb(sender_ctx, broadcast_data)
function flush(sender_ctx)
{
- console.log('flushing', sender_ctx.prepared_broadcasts);
sender_ctx.prepared_broadcasts.forEach(nv => broadcast(...nv));
sender_ctx.prepared_broadcasts = new Set();
}
diff --git a/background/patterns_query_manager.js b/background/patterns_query_manager.js
new file mode 100644
index 0000000..cb14cb1
--- /dev/null
+++ b/background/patterns_query_manager.js
@@ -0,0 +1,124 @@
+/**
+ * This file is part of Haketilo.
+ *
+ * Function: Instantiate the Pattern Tree data structure, filled with mappings
+ * from IndexedDB.
+ *
+ * Copyright (C) 2021 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 this code in a
+ * proprietary program, I am not going to enforce this in court.
+ */
+
+#IMPORT common/patterns_query_tree.js AS pqt
+#IMPORT common/indexeddb.js AS haketilodb
+
+#FROM common/browser.js IMPORT browser
+
+const tree = pqt.make();
+#EXPORT tree
+
+const current_mappings = new Map();
+
+let registered_script = null;
+let script_update_occuring = false;
+let script_update_needed;
+
+async function update_content_script()
+{
+ if (script_update_occuring)
+ return;
+
+ script_update_occuring = true;
+
+ while (script_update_needed) {
+ script_update_needed = false;
+
+ const code = `\
+this.haketilo_pattern_tree = ${JSON.stringify(tree)};
+if (this.haketilo_content_script_main)
+ haketilo_content_script_main();`;
+
+ const new_script = await browser.contentScripts.register({
+ "js": [{code}],
+ "matches": ["<all_urls>"],
+ "allFrames": true,
+ "runAt": "document_start"
+ });
+
+ if (registered_script)
+ registered_script.unregister();
+
+ registered_script = new_script;
+ }
+
+ script_update_occuring = false;
+}
+
+function register_mapping(mapping)
+{
+ for (const pattern in mapping.payloads)
+ pqt.register(tree, pattern, mapping.identifier, mapping);
+ current_mappings.set(mapping.identifier, mapping);
+}
+
+function mapping_changed(change)
+{
+ console.log('mapping changes!', arguments);
+ const old_version = current_mappings.get(change.identifier);
+ if (old_version !== undefined) {
+ for (const pattern in old_version.payloads)
+ pqt.deregister(tree, pattern, change.identifier);
+
+ current_mappings.delete(change.identifier);
+ }
+
+ if (change.new_val !== undefined)
+ register_mapping(change.new_val);
+
+ script_update_needed = true;
+ setTimeout(update_content_script, 0);
+}
+
+async function start()
+{
+ const [tracking, initial_mappings] =
+ await haketilodb.track_mappings(mapping_changed);
+
+ initial_mappings.forEach(register_mapping);
+ script_update_needed = true;
+ await update_content_script();
+}
+#EXPORT start