bluesky.from_as1: skip standalone hashtags beyond the first 8

...to stay under the app.bsky.feed.post#tags lexicon maxLength. fixes snarfed/bridgy-fed#1770

granary/bluesky.py

@@ -920,8 +920,12 @@ def from_as1(obj, out_type=None, blobs=None, aspects=None, client=None,
       index = facet.get('index')
 
       if not index:
+        max = LEXRPC_TRUNCATE.defs['app.bsky.feed.post']['record']['properties']['tags']['maxLength']
         if tag_type == 'hashtag':
-          standalone_tags.append(name)
+          if len(standalone_tags) < max:
+            standalone_tags.append(name)
+          else:
+            logger.warning(f'More than {max} standalone hashtags, omitting "{name}"')
         continue
 
       if index.get('byteStart', 0) >= text_byte_end:

granary/tests/test_bluesky.py

@@ -1194,6 +1194,30 @@ def test_from_as1_tag_hashtag_not_in_content(self):
       }],
     }))
 
+  def test_from_as1_too_many_hashtags(self):
+    self.assert_equals({
+      '$type': 'app.bsky.feed.post',
+      'text': 'foo bar',
+      'tags': ['1', '2', '3', '4', '5', '6', '7', '8'],
+      'createdAt': '2022-01-02T03:04:05.000Z',
+      'fooOriginalText': 'foo bar',
+    }, self.from_as1({
+      'objectType': 'note',
+      'content': 'foo bar',
+      'tags': [
+        {'objectType': 'hashtag', 'displayName': '1'},
+        {'objectType': 'hashtag', 'displayName': '2'},
+        {'objectType': 'hashtag', 'displayName': '3'},
+        {'objectType': 'hashtag', 'displayName': '4'},
+        {'objectType': 'hashtag', 'displayName': '5'},
+        {'objectType': 'hashtag', 'displayName': '6'},
+        {'objectType': 'hashtag', 'displayName': '7'},
+        {'objectType': 'hashtag', 'displayName': '8'},
+        {'objectType': 'hashtag', 'displayName': '9'},
+        {'objectType': 'hashtag', 'displayName': '10'},
+      ],
+    }))
+
   def test_from_as1_tag_mention_guess_index(self):
     self.assert_equals(POST_BSKY_FACET_MENTION, self.from_as1({
       'objectType': 'note',