[realvision] Add extractor for RealVision.

Real Vision examines finance, business and the global economy with
videos and reports that provide real in-depth analysis from real
experts.

Internally they're using Brightcove for content distribution, but we
need to make several requests to discover the Realvision video ID
which looks like an MD5 hash, and then use that to discover the
Brightcove video ID.  Along the way we collect better metadata like
published-vs-filmed dates, and a cleaner thumbnail.

Some videos are free, but others behind the membership wall require
the usage of a cookie jar.

docs/supportedsites.md

@@ -717,6 +717,7 @@
  - **RayWenderlichCourse**
  - **RBMARadio**
  - **RDS**: RDS.ca
+ - **RealVision**
  - **RedBullTV**
  - **RedBullTVRrnContent**
  - **Reddit**

youtube_dl/extractor/extractors.py

@@ -916,6 +916,7 @@ from .raywenderlich import (
 )
 from .rbmaradio import RBMARadioIE
 from .rds import RDSIE
+from .realvision import RealVisionIE
 from .redbulltv import (
     RedBullTVIE,
     RedBullTVRrnContentIE,

youtube_dl/extractor/realvision.py

@@ -0,0 +1,76 @@
+# coding: utf-8
+from __future__ import unicode_literals
+
+from .common import InfoExtractor
+
+from datetime import datetime
+
+from ..utils import (
+    try_get,
+    int_or_none,
+    float_or_none,
+    ExtractorError,
+)
+
+
+class RealVisionIE(InfoExtractor):
+    _VALID_URL = r'https?://(?:www\.)?realvision\.com/shows/.*?/videos/.*?'
+
+    _TEST = {
+        'url': 'https://www.realvision.com/shows/the-interview/videos/how-coronavirus-exposed-the-shaky-foundation',
+        'info_dict': {
+            'uploader_id': '3117927975001',
+            'id': '6145338821001',
+            'ext': 'mp4',
+            'title': 'How Coronavirus Exposed the "Shaky Foundation"',
+            'description': 'What happens when an upheaval so massive forces financial markets, governments, and society to rethink how our systems work? Michael Krieger, author of the Liberty Blitzkrieg, joins Real Vision to explain what coronavirus and the response to the outbreak has revealed about the condition of American systems – from financial markets to the health care system. Tracing the story of financial markets and societal trends over the past two decades, Krieger outlines how our systems have been pushed to the brink – focusing on emergency policy responses and the everything bubble. He also provides viewers with potential solutions to the systemic decay that has been brought to the forefront by the coronavirus outbreak.',
+            'thumbnail': 'https://www.realvision.com:443/rv/media/Video/d9b77910037f458497a56654165e459e/thumbnail',
+            'timestamp': 1585371600,
+            'upload_date': '20200312',
+            'release_date': '20200328',
+        },
+        'params': {
+            # m3u8 download
+            'skip_download': True,
+        },
+        'add_ie': ['BrightcoveNew'],
+    }
+
+    REALVISION_URL_TEMPLATE = 'https://www.realvision.com/rv/api/videos/%s?include=videoassets,viewer'
+    BRIGHTCOVE_URL_TEMPLATE = 'http://players.brightcove.net/3117927975001/default_default/index.html?videoId=%s'
+
+    def strdate_from_timestamp(timestamp):
+        return datetime.utcfromtimestamp(timestamp).strftime('%Y%m%d') if timestamp else None
+
+    def _real_extract(self, url):
+        webpage = self._download_webpage(url, url)
+        rv_id = self._search_regex(
+            r'<meta name="twitter:image" content="https://ichef.realvision.com/(.+?)/hero" />',
+            webpage, 'rv_id', fatal=True)
+        meta = self._download_json(self.REALVISION_URL_TEMPLATE % (rv_id), rv_id)
+
+        included = meta.get('included')
+        if not included:
+            raise ExtractorError('No assets for %s; missing cookiefile with paid subscription?' % rv_id, expected=True)
+
+        bc_id = try_get(included[0], lambda x: x['attributes']['videoassets_brightcove_id'])
+        if not bc_id:
+            raise ExtractorError('No Brightcove assets for %s.' % rv_id, expected=True)
+
+        filmed_timestamp = int_or_none(try_get(meta, lambda x: x['data']['attributes']['video_filmed_on']), scale=1000)
+        published_timestamp = int_or_none(try_get(meta, lambda x: x['data']['attributes']['video_published_on']), scale=1000)
+
+        return {
+            '_type': 'url_transparent',
+            'url': self.BRIGHTCOVE_URL_TEMPLATE % (bc_id),
+            'title': try_get(meta, lambda x: x['data']['attributes']['video_title']),
+            'description': try_get(meta, lambda x: x['data']['attributes']['video_description']),
+            'thumbnail': try_get(meta, lambda x: x['data']['links']['thumbnail']),
+            'timestamp': published_timestamp,
+            'upload_date': RealVisionIE.strdate_from_timestamp(filmed_timestamp),
+            'release_date': RealVisionIE.strdate_from_timestamp(published_timestamp),
+            'like_count': int_or_none(try_get(meta, lambda x: x['data']['attributes']['video_likes_count'])),
+            'dislike_count': int_or_none(try_get(meta, lambda x: x['data']['attributes']['video_dislikes_count'])),
+            'average_rating': float_or_none(try_get(meta, lambda x: x['data']['attributes']['video_rating'])),
+            'ie_key': 'BrightcoveNew',
+        }