Extra check for edition tag

outbox.py

@@ -63,6 +63,7 @@ from shares import outbox_undo_share_upload
 from webapp_post import individual_post_as_html
 from speaker import update_speaker
 from reading import store_book_events
+from reading import has_edition_tag
 
 
 def _person_receive_update_outbox(base_dir: str, http_prefix: str,
@@ -502,13 +503,14 @@ def post_message_to_outbox(session, translate: {},
                    theme, system_language,
                    outbox_name)
 
-    store_book_events(base_dir,
-                      message_json,
-                      system_language, [],
-                      translate, debug,
-                      max_recent_books,
-                      books_cache,
-                      max_cached_readers)
+    if has_edition_tag(message_json):
+        store_book_events(base_dir,
+                          message_json,
+                          system_language, [],
+                          translate, debug,
+                          max_recent_books,
+                          books_cache,
+                          max_cached_readers)
 
     # save all instance blogs to the news actor
     if post_to_nickname != 'news' and outbox_name == 'tlblogs':

reading.py

@@ -89,6 +89,30 @@ def _get_book_image_from_post(post_json_object: {}) -> str:
     return ''
 
 
+def has_edition_tag(post_json_object: {}) -> bool:
+    """Checks whether the given post has an Edition tag
+    indicating that it contains a book event
+    """
+    post_obj = post_json_object
+    if has_object_dict(post_json_object):
+        post_obj = post_json_object['object']
+
+    if not post_obj.get('tag'):
+        return False
+    if not isinstance(post_obj['tag'], list):
+        return False
+    for tag in post_obj['tag']:
+        if not isinstance(tag, dict):
+            continue
+        if not tag.get('type'):
+            continue
+        if not isinstance(tag['type'], str):
+            continue
+        if tag['type'] == 'Edition':
+            return True
+    return False
+
+
 def get_reading_status(post_json_object: {},
                        system_language: str,
                        languages_understood: [],
@@ -169,6 +193,9 @@ def get_reading_status(post_json_object: {},
                     book_dict['image_url'] = book_image_url
                 return book_dict
 
+    if not has_edition_tag(post_json_object):
+        return {}
+
     # get the book details from a post tag
     book_dict = get_book_from_post(post_json_object, debug)
     if not book_dict: