Remove all application-specific reply handler class overrides

Summary:
Ref T7199. In the vein of D12231, these options were a bad idea.

  - They once served a very narrow, Facebook-specific need (see T1992), except even Facebook only used the Differential setting AFAIK.
  - Outside of that special case, they are unused and essentially unusable (generally speaking, they do not meaningfully implement anything modular or replaceable).
  - I have no knowledge of any install ever changing these settings, and can imagine no reason why they would.

Moving forward:

  - If they really need to, they can fork locally and chagne one line.
  - I expect "!actions" to make mail at least somewhat more modular soon, anyway.
  - Any derived handlers would break after T7199 and need to be rewritten anyway, so this is just taking advantage of a BC break to do cleanup.

Test Plan:
  - Grepped for removed configuration.
  - Sent some mail from applications, verified the reply handlers set proper reply addresses.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7199

Differential Revision: https://secure.phabricator.com/D12233

src/applications/audit/editor/PhabricatorAuditCommentEditor.php

@@ -39,8 +39,7 @@ final class PhabricatorAuditCommentEditor extends PhabricatorEditor {
   }
 
   public static function newReplyHandlerForCommit($commit) {
-    $reply_handler = PhabricatorEnv::newObjectFromConfig(
-      'metamta.diffusion.reply-handler');
+    $reply_handler = new PhabricatorAuditReplyHandler();
     $reply_handler->setMailReceiver($commit);
     return $reply_handler;
   }

src/applications/audit/editor/PhabricatorAuditEditor.php

@@ -588,10 +588,8 @@ final class PhabricatorAuditEditor
     return $result;
   }
 
-
   protected function buildReplyHandler(PhabricatorLiskDAO $object) {
-    $reply_handler = PhabricatorEnv::newObjectFromConfig(
-      'metamta.diffusion.reply-handler');
+    $reply_handler = new PhabricatorAuditReplyHandler();
     $reply_handler->setMailReceiver($object);
     return $reply_handler;
   }

src/applications/config/check/PhabricatorExtraConfigSetupCheck.php

@@ -164,6 +164,9 @@ final class PhabricatorExtraConfigSetupCheck extends PhabricatorSetupCheck {
       'Configure a reply domain with "%s".',
       'metamta.reply-handler-domain');
 
+    $reply_handler_reason = pht(
+      'Reply handlers can no longer be overridden with configuration.');
+
     $ancient_config += array(
       'phid.external-loaders' =>
         pht(
@@ -233,6 +236,11 @@ final class PhabricatorExtraConfigSetupCheck extends PhabricatorSetupCheck {
       'metamta.macro.reply-handler-domain' => $reply_domain_reason,
       'metamta.maniphest.reply-handler-domain' => $reply_domain_reason,
       'metamta.pholio.reply-handler-domain' => $reply_domain_reason,
+
+      'metamta.diffusion.reply-handler' => $reply_handler_reason,
+      'metamta.differential.reply-handler' => $reply_handler_reason,
+      'metamta.maniphest.reply-handler' => $reply_handler_reason,
+      'metamta.package.reply-handler' => $reply_handler_reason,
     );
 
     return $ancient_config;

src/applications/differential/config/PhabricatorDifferentialConfigOptions.php

@@ -244,13 +244,6 @@ final class PhabricatorDifferentialConfigOptions
           pht(
             "Similar to `differential.days-fresh` but marks stale revisions. ".
             "If the revision is even older than it is when marked as 'old'.")),
-      $this->newOption(
-        'metamta.differential.reply-handler',
-        'class',
-        'DifferentialReplyHandler')
-        ->setLocked(true)
-        ->setBaseClass('PhabricatorMailReplyHandler')
-        ->setDescription(pht('Alternate reply handler class.')),
       $this->newOption(
         'metamta.differential.subject-prefix',
         'string',

src/applications/differential/mail/DifferentialMail.php

@@ -4,11 +4,8 @@ abstract class DifferentialMail extends PhabricatorMail {
 
   public static function newReplyHandlerForRevision(
     DifferentialRevision $revision) {
-
-    $reply_handler = PhabricatorEnv::newObjectFromConfig(
-      'metamta.differential.reply-handler');
+    $reply_handler = new DifferentialReplyHandler();
     $reply_handler->setMailReceiver($revision);
-
     return $reply_handler;
   }
 

src/applications/diffusion/config/PhabricatorDiffusionConfigOptions.php

@@ -26,13 +26,6 @@ final class PhabricatorDiffusionConfigOptions
         'string',
         '[Diffusion]')
         ->setDescription(pht('Subject prefix for Diffusion mail.')),
-      $this->newOption(
-        'metamta.diffusion.reply-handler',
-        'class',
-        'PhabricatorAuditReplyHandler')
-        ->setLocked(true)
-        ->setBaseClass('PhabricatorMailReplyHandler')
-        ->setDescription(pht('Override mail reply handler class.')),
       $this->newOption(
         'metamta.diffusion.attach-patches',
         'bool',

src/applications/maniphest/config/PhabricatorManiphestConfigOptions.php

@@ -272,13 +272,6 @@ EOTEXT
             'review and adjust available priorities by using the '.
             '{{maniphest.priorities}} configuration option. The default value '.
             '(`90`) corresponds to the default "Needs Triage" priority.')),
-      $this->newOption(
-        'metamta.maniphest.reply-handler',
-        'class',
-        'ManiphestReplyHandler')
-        ->setLocked(true)
-        ->setBaseClass('PhabricatorMailReplyHandler')
-        ->setDescription(pht('Override reply handler class.')),
       $this->newOption(
         'metamta.maniphest.subject-prefix',
         'string',

src/applications/maniphest/mail/ManiphestCreateMailReceiver.php

@@ -19,8 +19,7 @@ final class ManiphestCreateMailReceiver extends PhabricatorMailReceiver {
     $task = ManiphestTask::initializeNewTask($sender);
     $task->setOriginalEmailSource($mail->getHeader('From'));
 
-    $handler = PhabricatorEnv::newObjectFromConfig(
-      'metamta.maniphest.reply-handler');
+    $handler = new ManiphestReplyHandler();
     $handler->setMailReceiver($task);
 
     $handler->setActor($sender);

src/applications/maniphest/mail/ManiphestTaskMailReceiver.php

@@ -29,8 +29,7 @@ final class ManiphestTaskMailReceiver extends PhabricatorObjectMailReceiver {
     PhabricatorLiskDAO $object,
     PhabricatorUser $sender) {
 
-    $handler = PhabricatorEnv::newObjectFromConfig(
-      'metamta.maniphest.reply-handler');
+    $handler = new ManiphestReplyHandler();
     $handler->setMailReceiver($object);
 
     $handler->setActor($sender);

src/applications/owners/config/PhabricatorOwnersConfigOptions.php

@@ -21,13 +21,6 @@ final class PhabricatorOwnersConfigOptions
 
   public function getOptions() {
     return array(
-      $this->newOption(
-        'metamta.package.reply-handler',
-        'class',
-        'OwnersPackageReplyHandler')
-        ->setLocked(true)
-        ->setBaseClass('PhabricatorMailReplyHandler')
-        ->setDescription(pht('Reply handler for owners mail.')),
       $this->newOption('metamta.package.subject-prefix', 'string', '[Package]')
         ->setDescription(pht('Subject prefix for Owners email.')),
     );

src/applications/owners/mail/PackageMail.php

@@ -201,8 +201,7 @@ abstract class PackageMail extends PhabricatorMail {
   }
 
   private function newReplyHandler() {
-    $reply_handler = PhabricatorEnv::newObjectFromConfig(
-      'metamta.package.reply-handler');
+    $reply_handler = new OwnersPackageReplyHandler();
     $reply_handler->setMailReceiver($this->getPackage());
     return $reply_handler;
   }