move outgoing activitypub json into ap module

fedireads/activitypub/collection.py

@@ -1,5 +1,49 @@
 ''' activitypub json for collections '''
 from uuid import uuid4
+from urllib.parse import urlencode
+
+from .status import get_status
+
+def get_outbox(user, size):
+    ''' helper function for creating an outbox '''
+    return get_ordered_collection(user.outbox, size)
+
+
+def get_outbox_page(user, page_id, statuses, max_id, min_id):
+    ''' helper for formatting outbox pages '''
+    # not generalizing this more because the format varies for some reason
+    page = {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        'id': page_id,
+        'type': 'OrderedCollectionPage',
+        'partOf': user.outbox,
+        'orderedItems': [],
+    }
+
+    for status in statuses:
+        page['orderedItems'].append(get_status(status))
+
+    if max_id:
+        page['next'] = user.outbox + '?' + \
+            urlencode({'min_id': max_id, 'page': 'true'})
+    if min_id:
+        page['prev'] = user.outbox + '?' + \
+            urlencode({'max_id': min_id, 'page': 'true'})
+
+    return page
+
+
+def get_ordered_collection(path, size):
+    ''' create an ordered collection '''
+    return {
+        '@context': 'https://www.w3.org/ns/activitystreams',
+        'id': path,
+        'type': 'OrderedCollection',
+        'totalItems': size,
+        'first': '%s?page=true' % path,
+        'last': '%s?min_id=0&page=true' % path
+    }
+
 
 def get_add(*args):
     ''' activitypub Add activity '''