mediagoblin/process_media/__init__.py

   1 # GNU MediaGoblin -- federated, autonomous media hosting
   2 # Copyright (C) 2011 Free Software Foundation, Inc
   3 #
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU Affero General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU Affero General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU Affero General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 import Image
  18 from mediagoblin.db.util import ObjectId
  19 from celery.task import task
  20
  21 from mediagoblin import mg_globals as mgg
  22
  23
  24 THUMB_SIZE = 180, 180
  25 MEDIUM_SIZE = 640, 640
  26
  27
  28 def create_pub_filepath(entry, filename):
  29     return mgg.public_store.get_unique_filepath(
  30             ['media_entries',
  31              unicode(entry['_id']),
  32              filename])
  33
  34
  35 @task
  36 def process_media_initial(media_id):
  37     workbench = mgg.workbench_manager.create_workbench()
  38
  39     entry = mgg.database.MediaEntry.one(
  40         {'_id': ObjectId(media_id)})
  41
  42     queued_filepath = entry['queued_media_file']
  43     queued_filename = workbench.localized_file(
  44         mgg.queue_store, queued_filepath,
  45         'source')
  46
  47     thumb = Image.open(queued_filename)
  48     thumb.thumbnail(THUMB_SIZE, Image.ANTIALIAS)
  49     # ensure color mode is compatible with jpg
  50     if thumb.mode != "RGB":
  51         thumb = thumb.convert("RGB")
  52
  53     thumb_filepath = create_pub_filepath(entry, 'thumbnail.jpg')
  54
  55     thumb_file = mgg.public_store.get_file(thumb_filepath, 'w')
  56     with thumb_file:
  57         thumb.save(thumb_file, "JPEG", quality=90)
  58
  59     """
  60     Create medium file, used in `media.html`
  61     """
  62     medium = Image.open(queued_filename)
  63     medium.thumbnail(MEDIUM_SIZE, Image.ANTIALIAS)
  64
  65     if medium.mode != "RGB":
  66         medium = medium.convert("RGB")
  67
  68     medium_filepath = create_pub_filepath(entry, 'medium.jpg')
  69
  70     medium_file = mgg.public_store.get_file(medium_filepath, 'w')
  71     with medium_file:
  72         medium.save(medium_file, "JPEG", quality=90)
  73
  74     # we have to re-read because unlike PIL, not everything reads
  75     # things in string representation :)
  76     queued_file = file(queued_filename, 'rb')
  77
  78     with queued_file:
  79         main_filepath = create_pub_filepath(entry, queued_filepath[-1])
  80
  81         with mgg.public_store.get_file(main_filepath, 'wb') as main_file:
  82             main_file.write(queued_file.read())
  83
  84     mgg.queue_store.delete_file(queued_filepath)
  85     entry['queued_media_file'] = []
  86     media_files_dict = entry.setdefault('media_files', {})
  87     media_files_dict['thumb'] = thumb_filepath
  88     media_files_dict['main'] = main_filepath
  89     media_files_dict['medium'] = medium_filepath
  90     entry['state'] = u'processed'
  91     entry.save()
  92
  93     # clean up workbench
  94     workbench.destroy_self()