Set messageIDHash from SendGrid and Test controllers

Summary:
Most mail comes in through the script, but we can also generate it with the test controller or the SendGrid receiver.

In these cases, we produce a `null` message hash ID, which fails on inserts into MySQL databases configured in strict mode.

Instead, correctly generate the hash ID in these cases (for tests, make one up).

Test Plan: Generated test mail. (I'll see if @sokcevic can test SendGrid).

Reviewers: btrahan

Reviewed By: btrahan

CC: sokcevic, aran

Maniphest Tasks: T2423

Differential Revision: https://secure.phabricator.com/D4667

src/applications/metamta/controller/PhabricatorMetaMTAReceiveController.php

@@ -28,6 +28,12 @@ final class PhabricatorMetaMTAReceiveController
         array(
           'text' => $request->getStr('body'),
         ));
+
+      // Make up some unique value, since this column isn't nullable.
+      $received->setMessageIDHash(
+        PhabricatorHash::digestForIndex(
+          Filesystem::readRandomBytes(12)));
+
       $received->save();
 
       $received->processReceivedMail();

src/applications/metamta/controller/PhabricatorMetaMTASendGridReceiveController.php

@@ -39,6 +39,8 @@ final class PhabricatorMetaMTASendGridReceiveController
       'text' => $request->getStr('text'),
       'html' => $request->getStr('from'),
     ));
+    $received->setMessageIDHash(
+      PhabricatorHash::digestForIndex($received->getMessageID()));
 
     $file_phids = array();
     foreach ($_FILES as $file_raw) {