Add a rudimentary media processing function.

Haven't completely checked it for workingness, and not the final form
this will take :)

mediagoblin/process_media/__init__.py

@@ -0,0 +1,50 @@
+# GNU MediaGoblin -- federated, autonomous media hosting
+# Copyright (C) 2011 Free Software Foundation, Inc
+#
+# 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 <http://www.gnu.org/licenses/>.
+
+import Image
+import mongokit
+from celery.task import task
+
+from mediagoblin.globals import database, queue_store, public_store
+
+
+THUMB_SIZE = 200, 200
+
+
+@task
+def process_media_initial(media_id):
+    entry = database.MediaEntry.one(
+        {'_id': mongokit.ObjectId(media_id)})
+
+    queued_filepath = entry['queue_files'].pop()
+    queued_file = queue_store.get_file(queued_filepath, 'r')
+
+    with queued_file:
+        thumb = Image(queued_file)
+        thumb.thumbnail(THUMB_SIZE, Image.ANTIALIAS)
+
+        thumb_filepath = public_store.get_unique_filepath(
+            ['media_entries',
+             unicode(entry['_id']),
+             'thumbnail.jpg'])
+
+        with public_store.get_file(thumb_filepath, 'w') as thumb_file:
+            thumb.save(thumb_file, "JPEG")
+
+    queue_store.delete(queued_filepath)
+    entry.setdefault('media_files', []).append(thumb_filepath)
+    entry.state = 'processed'
+    entry.save()