[anvato] update ANVACK table and add experimental token generator for NFL

youtube_dl/extractor/anvato_token_generator/__init__.py

@@ -0,0 +1,7 @@
+from __future__ import unicode_literals
+
+from .nfl import NFLTokenGenerator
+
+__all__ = [
+    'NFLTokenGenerator',
+]

youtube_dl/extractor/anvato_token_generator/common.py

@@ -0,0 +1,6 @@
+from __future__ import unicode_literals
+
+
+class TokenGenerator:
+    def generate(self, anvack, mcp_id):
+        raise NotImplementedError('This method must be implemented by subclasses')

youtube_dl/extractor/anvato_token_generator/nfl.py

@@ -0,0 +1,30 @@
+from __future__ import unicode_literals
+
+import json
+
+from .common import TokenGenerator
+
+
+class NFLTokenGenerator(TokenGenerator):
+    _AUTHORIZATION = None
+
+    def generate(ie, anvack, mcp_id):
+        if not NFLTokenGenerator._AUTHORIZATION:
+            reroute = ie._download_json(
+                'https://api.nfl.com/v1/reroute', mcp_id,
+                data=b'grant_type=client_credentials',
+                headers={'X-Domain-Id': 100})
+            NFLTokenGenerator._AUTHORIZATION = '%s %s' % (reroute.get('token_type') or 'Bearer', reroute['access_token'])
+        return ie._download_json(
+            'https://api.nfl.com/v3/shield/', mcp_id, data=json.dumps({
+                'query': '''{
+  viewer {
+    mediaToken(anvack: "%s", id: %s) {
+      token
+    }
+  }
+}''' % (anvack, mcp_id),
+            }).encode(), headers={
+                'Authorization': NFLTokenGenerator._AUTHORIZATION,
+                'Content-Type': 'application/json',
+            })['data']['viewer']['mediaToken']['token']