Add bookmark sharing (#311)

* Allow marking bookmarks as shared

* Add basic share view

* Ensure tag names in tag cloud are unique

* Filter shared bookmarks by user

* Add link for filtering by user

* Prevent n+1 queries when rendering bookmark list

* Prevent empty query params in return URL

* Fix user select template tag name

* Create shared bookmarks through API

* List shared bookmarks through API

* Show bookmark suggestions for shared view

* Show unique tags in search suggestions

* Sort user options

* Add bookmark sharing feature flag

* Add test for share setting default

* Simplify settings view

bookmarks/queries.py

@@ -1,3 +1,5 @@
+from typing import Optional
+
 from django.contrib.auth.models import User
 from django.db.models import Q, Count, Aggregate, CharField, Value, BooleanField, QuerySet
 
@@ -27,7 +29,13 @@ def query_archived_bookmarks(user: User, query_string: str) -> QuerySet:
         .filter(is_archived=True)
 
 
-def _base_bookmarks_query(user: User, query_string: str) -> QuerySet:
+def query_shared_bookmarks(user: Optional[User], query_string: str) -> QuerySet:
+    return _base_bookmarks_query(user, query_string) \
+        .filter(shared=True) \
+        .filter(owner__profile__enable_sharing=True)
+
+
+def _base_bookmarks_query(user: Optional[User], query_string: str) -> QuerySet:
     # Add aggregated tag info to bookmark instances
     query_set = Bookmark.objects \
         .annotate(tag_count=Count('tags'),
@@ -35,7 +43,8 @@ def _base_bookmarks_query(user: User, query_string: str) -> QuerySet:
                   tag_projection=Value(True, BooleanField()))
 
     # Filter for user
-    query_set = query_set.filter(owner=user)
+    if user:
+        query_set = query_set.filter(owner=user)
 
     # Split query into search terms and tags
     query = _parse_query_string(query_string)
@@ -88,6 +97,22 @@ def query_archived_bookmark_tags(user: User, query_string: str) -> QuerySet:
     return query_set.distinct()
 
 
+def query_shared_bookmark_tags(user: Optional[User], query_string: str) -> QuerySet:
+    bookmarks_query = query_shared_bookmarks(user, query_string)
+
+    query_set = Tag.objects.filter(bookmark__in=bookmarks_query)
+
+    return query_set.distinct()
+
+
+def query_shared_bookmark_users(query_string: str) -> QuerySet:
+    bookmarks_query = query_shared_bookmarks(None, query_string)
+
+    query_set = User.objects.filter(bookmark__in=bookmarks_query)
+
+    return query_set.distinct()
+
+
 def get_user_tags(user: User):
     return Tag.objects.filter(owner=user).all()