Introducing external video encoding

It is now possible to specify an encoding backend (at the moment only
zencoder) to take care of video variations encoding. Files transfer
happens directly on CGS (although any storage backend can be
supported). New requirements is the Zencoder Python library.

pillar/application/__init__.py

@@ -5,11 +5,13 @@ from datetime import datetime
 import bugsnag
 from bugsnag.flask import handle_exceptions
 from algoliasearch import algoliasearch
+from zencoder import Zencoder
 from flask import g
 from flask import request
 from flask import url_for
 from flask import abort
 from eve import Eve
+
 from eve.auth import TokenAuth
 from eve.io.mongo import Validator
 
@@ -105,6 +107,12 @@ if 'ALGOLIA_USER' in app.config:
 else:
     algolia_index_users = None
 
+# Encoding backend
+if app.config['ENCODING_BACKEND'] == 'zencoder':
+    encoding_service_client = Zencoder(app.config['ZENCODER_API_KEY'])
+else:
+    encoding_service_client = None
+
 from application.utils.authentication import validate_token
 from application.utils.authorization import check_permissions
 from application.utils.cdn import hash_file_path
@@ -302,3 +310,6 @@ app.on_delete_item_files += before_deleting_file
 from modules.file_storage import file_storage
 #from modules.file_storage.serve import *
 app.register_blueprint(file_storage, url_prefix='/storage')
+# The encoding module (receive notification and report progress)
+from modules.encoding import encoding
+app.register_blueprint(encoding, url_prefix='/encoding')