microformats2: convert audio and video properties to AS attachments

for #102

README.md

@@ -291,6 +291,7 @@ Changelog
 * Source.get_activities(): start raising ValueError on bad argument values, notably invalid Facebook and Twitter ids and Instagram search queries.
 * microformats2:
     * Interpret `h-cite` and [`u-quotation-of` (experimental)](https://indieweb.org/quotation#How_to_markup) as attachments, e.g. for quote tweets.
+    * Convert [audio](http://indieweb.org/audio) and [video](http://indieweb.org/video) properties to AS attachments.
 * Twitter:
     * Linkify @-mentions and hashtags in `preview_create()`.
     * Support creating quote tweets from attachments with Twitter URLs.

granary/microformats2.py

@@ -285,6 +285,11 @@ def absolute_urls(prop):
     for quote in mf2.get('children', []) + props.get('quotation-of', [])
     if isinstance(quote, dict) and 'h-cite' in set(quote.get('type', []))]
 
+  # audio and video
+  for type in 'audio', 'video':
+    attachments.extend({'objectType': type, 'url': url}
+                       for url in get_string_urls(props.get(type, [])))
+
   obj = {
     'id': prop.get('uid'),
     'objectType': as_type,

granary/test/testdata/note_with_audio_video.as-from-mf2.json

@@ -0,0 +1,12 @@
+{
+  "objectType": "note",
+  "content": "something",
+  "attachments": [{
+    "objectType": "audio",
+    "url": "http://a/podcast.mp3"
+  }, {
+    "objectType": "video",
+    "url": "http://a/vidjo.mov"
+  }],
+  "stream": [{"url": "http://a/vidjo.mov"}]
+}

granary/test/testdata/note_with_audio_video.mf2.json

@@ -0,0 +1,8 @@
+{
+  "type": ["h-entry"],
+  "properties": {
+    "content": "something",
+    "audio": ["http://a/podcast.mp3"],
+    "video": ["http://a/vidjo.mov"]
+  }
+}