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     If the size of the original file exceeds the specified size of a `medium`
  61     file, a `medium.jpg` files is created and later associated with the media
  62     entry.
  63     """
  64     medium = Image.open(queued_filename)
  65     medium_processed = False
  66
  67     if medium.size[0] > MEDIUM_SIZE[0] or medium.size[1] > MEDIUM_SIZE[1]:
  68         medium.thumbnail(MEDIUM_SIZE, Image.ANTIALIAS)
  69
  70         if medium.mode != "RGB":
  71             medium = medium.convert("RGB")
  72
  73         medium_filepath = create_pub_filepath(entry, 'medium.jpg')
  74
  75         medium_file = mgg.public_store.get_file(medium_filepath, 'w')
  76         with medium_file:
  77             medium.save(medium_file, "JPEG", quality=90)
  78             medium_processed = True
  79
  80     # we have to re-read because unlike PIL, not everything reads
  81     # things in string representation :)
  82     queued_file = file(queued_filename, 'rb')
  83
  84     with queued_file:
  85         original_filepath = create_pub_filepath(entry, queued_filepath[-1])
  86
  87         with mgg.public_store.get_file(original_filepath, 'wb') as original_file:
  88             original_file.write(queued_file.read())
  89
  90     mgg.queue_store.delete_file(queued_filepath)
  91     entry['queued_media_file'] = []
  92     media_files_dict = entry.setdefault('media_files', {})
  93     media_files_dict['thumb'] = thumb_filepath
  94     media_files_dict['original'] = original_filepath
  95     if medium_processed:
  96         media_files_dict['medium'] = medium_filepath
  97     entry['state'] = u'processed'
  98     entry.save()
  99
 100     # clean up workbench
 101     workbench.destroy_self()