Adding Handle Suport

Summary: Added PHID_TYPE_XUSR to loadObjectsofType() of PhabricatorObjectHandle data. Was trying to solve the setActor() issue. Created a getPhabricator method in PhabricatorExternalAccount. When I try to set authorPHID using setAuthorPHID() in PhabricatorExternalAccount it's saying bad setter call, if I don't, then it's saying authorPHID can't be null. Sending you diff for comments on this.

Test Plan:
{F42523}

{F42525}

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin, AnhNhan

Differential Revision: https://secure.phabricator.com/D5839

Author: afaquejam

src/applications/metamta/storage/PhabricatorMetaMTAReceivedMail.php

@@ -260,10 +260,10 @@ public function processReceivedMail() {
       $receiver->setPriority(ManiphestTaskPriority::PRIORITY_TRIAGE);
 
       $editor = new ManiphestTransactionEditor();
-      $editor->setActor($user);
+      $editor->setActor($user->getPhabricatorUser());
       $handler = $editor->buildReplyHandler($receiver);
 
-      $handler->setActor($user);
+      $handler->setActor($user->getPhabricatorUser());
       $handler->setExcludeMailRecipientPHIDs(
       $this->loadExcludeMailRecipientPHIDs());
       $handler->processEmail($this);

src/applications/people/storage/PhabricatorExternalAccount.php

@@ -20,4 +20,11 @@ public function getConfiguration() {
     ) + parent::getConfiguration();
   }
 
+  public function getPhabricatorUser() {
+    $tmp_usr = id(new PhabricatorUser())
+      ->makeEphemeral()
+      ->setPHID($this->getPHID());
+    return $tmp_usr;
+  }
+
 }

src/applications/phid/handle/PhabricatorObjectHandleData.php

@@ -205,6 +205,13 @@ private function loadObjectsOfType($type, array $phids) {
           ->execute();
         return mpull($vars, null, 'getPHID');
 
+      case PhabricatorPHIDConstants::PHID_TYPE_XUSR:
+        $xusr_dao = new PhabricatorExternalAccount();
+        $xusrs = $xusr_dao->loadAllWhere(
+          'phid in (%Ls)',
+          $phids);
+        return mpull($xusrs, null, 'getPHID');
+
     }
   }
 
@@ -681,6 +688,23 @@ public function loadHandles() {
           }
           break;
 
+        case PhabricatorPHIDConstants::PHID_TYPE_XUSR:
+          foreach ($phids as $phid) {
+            $handle = new PhabricatorObjectHandle();
+            $handle->setPHID($phid);
+            $handle->setType($type);
+            if (empty($objects[$phid])) {
+              $handle->setName('Unknown Display Name');
+            } else {
+              $xusr = $objects[$phid];
+              $display_name = $xusr->getDisplayName();
+              $handle->setName($display_name);
+              $handle->setFullName($display_name.' (External User)');
+            }
+            $handles[$phid] = $handle;
+          }
+          break;
+
         default:
           $loader = null;
           if (isset($external_loaders[$type])) {