use unique hashes when smuggling whitelist setting

1 files changed, 32 insertions, 0 deletions

diff --git a/common/gen_unique.js b/common/gen_unique.js
new file mode 100644
index 0000000..920426b
--- /dev/null
+++ b/common/gen_unique.js
@@ -0,0 +1,32 @@
+/**
+* Myext generating unique, per-site hash
+*
+* Copyright (C) 2021 Wojtek Kosior
+*
+* Dual-licensed under:
+*   - 0BSD license
+*   - GPLv3 or (at your option) any later version
+*/
+
+"use strict";
+
+(() => {
+    const sha256 = window.sha256;
+    const browser = window.browser;
+    const is_chrome = window.is_chrome;
+
+    function get_id()
+    {
+	if (is_chrome)
+	    return browser.runtime.getManifest().key.substring(0, 50);
+	else
+	    return browser.runtime.getURL("dummy");
+    }
+
+    function gen_unique(url)
+    {
+	return "#" + sha256(get_id() + url);
+    }
+
+    window.gen_unique = gen_unique;
+})();