Simulate webfinger for posts to shared inbox

posts.py

@@ -1174,14 +1174,16 @@ def sendSignedJson(postJsonObject: {},session,baseDir: str, \
             if ':' not in toDomain:
                 toDomain=toDomain+':'+str(toPort)        
 
-    if toNickname!='inbox':
+    if not sharedInbox:
         handle=httpPrefix+'://'+toDomain+'/@'+toNickname
     else:
         handle=httpPrefix+'://'+toDomain+'/'+toNickname
+        sharedInboxUrl=handle
         
     if debug:
         print('DEBUG: handle - '+handle+' toPort '+str(toPort))
 
+    if not sharedInbox:        
         # lookup the inbox for the To handle
         wfRequest=webfingerHandle(session,handle,httpPrefix,cachedWebfingers, \
                                   domain,projectVersion)
@@ -1189,6 +1191,20 @@ def sendSignedJson(postJsonObject: {},session,baseDir: str, \
             if debug:
                 print('DEBUG: webfinger for '+handle+' failed')
             return 1
+    else:
+        wfRequest={
+            "aliases": [
+                httpPrefix+'://'+toDomain+'/inbox'
+            ],
+            "links": [
+                {
+                    "href": httpPrefix+'://'+toDomain+'/inbox',
+                    "rel": "self",
+                    "type": "application/activity+json"
+                }
+            ],
+            "subject": 'acct:inbox@'+toDomain
+        }        
 
     if not clientToServer:
         postToBox='inbox'