Add sticker-download-thumbnails for adding thumbnails to an existing pack

setup.py

@@ -50,5 +50,6 @@ setuptools.setup(
     entry_points={"console_scripts": [
         "sticker-import=sticker.stickerimport:cmd",
         "sticker-pack=sticker.pack:cmd",
+        "sticker-download-thumbnails=sticker.download_thumbnails:cmd",
     ]},
 )

sticker/download_thumbnails.py

@@ -0,0 +1,58 @@
+# maunium-stickerpicker - A fast and simple Matrix sticker picker widget.
+# Copyright (C) 2025 Tulir Asokan
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+from pathlib import Path
+from typing import Dict
+import argparse
+import asyncio
+import json
+
+from aiohttp import ClientSession
+from yarl import URL
+
+from .lib import matrix, util
+
+parser = argparse.ArgumentParser()
+parser.add_argument("--config",
+                    help="Path to JSON file with Matrix homeserver and access_token",
+                    type=str, default="config.json", metavar="file")
+parser.add_argument("path", help="Path to the sticker pack JSON file", type=str)
+
+
+async def main(args: argparse.Namespace) -> None:
+    await matrix.load_config(args.config)
+    with util.open_utf8(args.path) as pack_file:
+        pack = json.load(pack_file)
+        print(f"Loaded existing pack meta from {args.path}")
+
+    stickers_data: Dict[str, bytes] = {}
+    async with ClientSession() as sess:
+        for sticker in pack["stickers"]:
+            dl_url = URL(matrix.homeserver_url) / "_matrix/client/v1/media/download" / sticker["url"].removeprefix("mxc://")
+            print("Downloading", sticker["url"])
+            async with sess.get(dl_url, headers={"Authorization": f"Bearer {matrix.access_token}"}) as resp:
+                resp.raise_for_status()
+                stickers_data[sticker["url"]] = await resp.read()
+
+    print("All stickers downloaded, generating thumbnails...")
+    util.add_thumbnails(pack["stickers"], stickers_data, Path(args.path).parent)
+    print("Done!")
+
+def cmd():
+    asyncio.run(main(parser.parse_args()))
+
+
+if __name__ == "__main__":
+    cmd()