Handle forwarded messages (#273)

* correct path of foss_satan

* add APIri and notes

* test create forward note

* rename target => receiving account

* split up create into separate funcs

* update extractFromCtx

* tidy up from federator processing

* foss satan => http not https

* check if status in db

* mock dereference of status from IRI

* add forward message deref test

* update test with activities

* add remote_account_2 to test rig

internal/federation/federatingdb/update.go

@@ -56,12 +56,9 @@ func (f *federatingDB) Update(ctx context.Context, asType vocab.Type) error {
 		l.Debug("entering Update")
 	}
 
-	targetAcct, fromFederatorChan, err := extractFromCtx(ctx)
-	if err != nil {
-		return err
-	}
-	if targetAcct == nil || fromFederatorChan == nil {
-		// If the target account or federator channel wasn't set on the context, that means this request didn't pass
+	receivingAccount, _, fromFederatorChan := extractFromCtx(ctx)
+	if receivingAccount == nil || fromFederatorChan == nil {
+		// If the receiving account or federator channel wasn't set on the context, that means this request didn't pass
 		// through the API, but came from inside GtS as the result of another activity on this instance. That being so,
 		// we can safely just ignore this activity, since we know we've already processed it elsewhere.
 		return nil
@@ -153,7 +150,7 @@ func (f *federatingDB) Update(ctx context.Context, asType vocab.Type) error {
 			APObjectType:     ap.ObjectProfile,
 			APActivityType:   ap.ActivityUpdate,
 			GTSModel:         updatedAcct,
-			ReceivingAccount: targetAcct,
+			ReceivingAccount: receivingAccount,
 		}
 	}