Add Brightcove content encryption and autoquality via HLS (#104)

# Brightcove content protection and auto-quality:

On API authentication uploads two custom Ingest Profiles:

- Creates new API credentials with required permissions
- HLS for auto quality
- HLSe for auto qualify & encryption
- Add new UI controls after a user has authenticated against Brightcove API:

View video tech info
- Send video re-transcode request on a Brightcove side

# Default transcripts upload:
- Allows to fetch transcripts from the platform and store them into XBlock.
- Supports: Brightcove, Youtube & Wistia.
- Brightcove & Wistia require API authentication before default transcripts upload can work.

.codeclimate.yml

@@ -1,3 +1,4 @@
+# Serves for configuration of CodeClimate (automated code review for test coverage, complexity, duplication, etc.)
 engines:
   csslint:
     enabled: true

Makefile

@@ -13,8 +13,8 @@ test-py:
 quality: quality-py quality-js
 
 quality-py:
-	-pep8 . --format=pylint --max-line-length=120
-	-pylint -f colorized video_xblock
+	pep8 . --format=pylint --max-line-length=120
+	pylint -f colorized video_xblock
 
 quality-js:
 	eslint video_xblock/static/js/

bower.json

@@ -6,7 +6,7 @@
     "videojs-youtube": "raccoongang/videojs-youtube#playback-rate-fix",
     "videojs-wistia": "raccoongang/videojs-wistia#playback-toggle-fix",
     "videojs-transcript": "0.8.0",
-    "videojs-resolution-switcher": "85f1e51c8babefca2d670dbd0b21a6307dbb4d21",
+    "videojs-resolution-switcher": "videojs-resolution-switcher#85f1e51",
     "videojs-offset": "raccoongang/videojs-offset#master",
     "videojs-contextmenu": "brightcove/videojs-contextmenu",
     "videojs-contextmenu-ui": "brightcove/videojs-contextmenu-ui",

test_requirements.txt

@@ -1,3 +1,9 @@
+# Auto-transcripts upload is dependent on xmodule.contentstore
+git+https://github.com/edx/edx-platform.git@open-release/eucalyptus.3#egg=xmodule==0.1.1&subdirectory=common/lib/xmodule/
+PyContracts==1.7.1   # xmodule dependency
+sortedcontainers==0.9.2  # xmodule dependency
+Pillow==3.1.1  # xmodule dependency
+
 coveralls==1.1
 django==1.8.12
 edx-lint==0.5.2

video_xblock/backends/base.py

@@ -21,14 +21,71 @@
 html_parser = HTMLParser()  # pylint: disable=invalid-name
 
 
+class ApiClientError(Exception):
+    """
+    Base API client exception
+    """
+    pass
+
+
+class BaseApiClient(object):
+    """
+    Low level video platform API client.
+
+    Abstracts API interaction details like
+    requests composition, API credentials handling.
+
+    Subclass your platform specific API client from this base class.
+
+    """
+
+    @abc.abstractmethod
+    def get(self, url, headers=None, can_retry=True):
+        """
+        Issue REST GET request to a given URL.
+
+        Can throw ApiClientError or it's subclass.
+
+        Arguments:
+            url (str): API url to fetch a resource from.
+            headers (dict): Headers necessary as per API, e.g. authorization bearer to perform authorised requests.
+            can_retry (bool): True if this is to retry a call if authentication failed.
+
+        Returns:
+            Response in python native data format.
+
+        """
+
+    @abc.abstractmethod
+    def post(self, url, payload, headers=None, can_retry=True):
+        """
+        Issue REST POST request to a given URL.
+
+        Can throw ApiClientError or it's subclass.
+
+        Arguments:
+            url (str): API url to fetch a resource from.
+            headers (dict): Headers necessary as per API, e.g. authorization bearer to perform authorised requests.
+            can_retry (bool): True if this is to retry a call if authentication failed.
+
+        Returns:
+            Response in python native data format.
+
+        """
+
+
 class BaseVideoPlayer(Plugin):
     """
     Inherit your video player class from this class
+
     """
     __metaclass__ = abc.ABCMeta
 
     entry_point = 'video_xblock.v1'
 
+    def __init__(self, xblock):
+        self.xblock = xblock
+
     @abc.abstractproperty
     def url_re(self):
         """
@@ -222,14 +279,16 @@ def authenticate_api(self, **kwargs):
         return {}, ''
 
     @abc.abstractmethod
-    def download_default_transcript(self, url):  # pylint: disable=unused-argument
+    def download_default_transcript(self, url, language_code):  # pylint: disable=unused-argument
         """
-        Downloads default transcript from a video platform API and uploads it to the video xblock.
+        Downloads default transcript from a video platform API and formats it accordingly to the WebVTT standard.
 
         Arguments:
-            url (str): transcript download url.
+            url (str): API url to fetch a default transcript from.
+            language_code (str): Language code of a transcript to be downloaded.
         Returns:
-            unicode: Transcripts in WebVTT or SRT format.
+            unicode: Transcripts formatted per WebVTT.
+
         """
         return u''