Lift common code for transaction-based reply handlers into parent class

Summary:
Ref T7199. Essentially all of the reply handlers now apply transactions to something which implements PhabricatorApplicationTransactionInterface.

We can share code between them by lifting this stuff into a superclass.

First, convert paste. Also rename `PasteMockMailReceiver` to `PasteMailReceiver` (this got mis-copied from Pholio at some point, I think).

Test Plan: Used `bin/mail receive-test` to send comments + `!unsubscribe` to pastes.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Maniphest Tasks: T7199

Differential Revision: https://secure.phabricator.com/D12236

src/__phutil_library_map__.php

@@ -1248,7 +1248,7 @@ phutil_register_library_map(array(
     'PasteDefaultViewCapability' => 'applications/paste/capability/PasteDefaultViewCapability.php',
     'PasteEmbedView' => 'applications/paste/view/PasteEmbedView.php',
     'PasteInfoConduitAPIMethod' => 'applications/paste/conduit/PasteInfoConduitAPIMethod.php',
-    'PasteMockMailReceiver' => 'applications/paste/mail/PasteMockMailReceiver.php',
+    'PasteMailReceiver' => 'applications/paste/mail/PasteMailReceiver.php',
     'PasteQueryConduitAPIMethod' => 'applications/paste/conduit/PasteQueryConduitAPIMethod.php',
     'PasteReplyHandler' => 'applications/paste/mail/PasteReplyHandler.php',
     'PeopleBrowseUserDirectoryCapability' => 'applications/people/capability/PeopleBrowseUserDirectoryCapability.php',
@@ -1310,6 +1310,7 @@ phutil_register_library_map(array(
     'PhabricatorApplicationTransactionNoEffectException' => 'applications/transactions/exception/PhabricatorApplicationTransactionNoEffectException.php',
     'PhabricatorApplicationTransactionNoEffectResponse' => 'applications/transactions/response/PhabricatorApplicationTransactionNoEffectResponse.php',
     'PhabricatorApplicationTransactionQuery' => 'applications/transactions/query/PhabricatorApplicationTransactionQuery.php',
+    'PhabricatorApplicationTransactionReplyHandler' => 'applications/transactions/replyhandler/PhabricatorApplicationTransactionReplyHandler.php',
     'PhabricatorApplicationTransactionResponse' => 'applications/transactions/response/PhabricatorApplicationTransactionResponse.php',
     'PhabricatorApplicationTransactionShowOlderController' => 'applications/transactions/controller/PhabricatorApplicationTransactionShowOlderController.php',
     'PhabricatorApplicationTransactionStructureException' => 'applications/transactions/exception/PhabricatorApplicationTransactionStructureException.php',
@@ -4512,9 +4513,9 @@ phutil_register_library_map(array(
     'PasteDefaultViewCapability' => 'PhabricatorPolicyCapability',
     'PasteEmbedView' => 'AphrontView',
     'PasteInfoConduitAPIMethod' => 'PasteConduitAPIMethod',
-    'PasteMockMailReceiver' => 'PhabricatorObjectMailReceiver',
+    'PasteMailReceiver' => 'PhabricatorObjectMailReceiver',
     'PasteQueryConduitAPIMethod' => 'PasteConduitAPIMethod',
-    'PasteReplyHandler' => 'PhabricatorMailReplyHandler',
+    'PasteReplyHandler' => 'PhabricatorApplicationTransactionReplyHandler',
     'PeopleBrowseUserDirectoryCapability' => 'PhabricatorPolicyCapability',
     'PeopleCreateUsersCapability' => 'PhabricatorPolicyCapability',
     'PeopleUserLogGarbageCollector' => 'PhabricatorGarbageCollector',
@@ -4579,6 +4580,7 @@ phutil_register_library_map(array(
     'PhabricatorApplicationTransactionNoEffectException' => 'Exception',
     'PhabricatorApplicationTransactionNoEffectResponse' => 'AphrontProxyResponse',
     'PhabricatorApplicationTransactionQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
+    'PhabricatorApplicationTransactionReplyHandler' => 'PhabricatorMailReplyHandler',
     'PhabricatorApplicationTransactionResponse' => 'AphrontProxyResponse',
     'PhabricatorApplicationTransactionShowOlderController' => 'PhabricatorApplicationTransactionController',
     'PhabricatorApplicationTransactionStructureException' => 'Exception',

src/applications/paste/mail/PasteMailReceiver.php

@@ -1,6 +1,6 @@
 <?php
 
-final class PasteMockMailReceiver extends PhabricatorObjectMailReceiver {
+final class PasteMailReceiver extends PhabricatorObjectMailReceiver {
 
   public function isEnabled() {
     $app_class = 'PhabricatorPasteApplication';

src/applications/paste/mail/PasteReplyHandler.php

@@ -1,6 +1,7 @@
 <?php
 
-final class PasteReplyHandler extends PhabricatorMailReplyHandler {
+final class PasteReplyHandler
+  extends PhabricatorApplicationTransactionReplyHandler {
 
   public function validateMailReceiver($mail_receiver) {
     if (!($mail_receiver instanceof PhabricatorPaste)) {
@@ -8,35 +9,14 @@ final class PasteReplyHandler extends PhabricatorMailReplyHandler {
     }
   }
 
-  public function getPrivateReplyHandlerEmailAddress(
-    PhabricatorObjectHandle $handle) {
-    return $this->getDefaultPrivateReplyHandlerEmailAddress($handle, 'P');
+  public function getObjectPrefix() {
+    return 'P';
   }
 
-  public function getPublicReplyHandlerEmailAddress() {
-    return $this->getDefaultPublicReplyHandlerEmailAddress('P');
-  }
-
-  protected function receiveEmail(PhabricatorMetaMTAReceivedMail $mail) {
+  protected function processMailCommands(array $commands) {
    $actor = $this->getActor();
-    $paste = $this->getMailReceiver();
-
-    $body_data = $mail->parseBody();
-    $body = $body_data['body'];
-    $body = $this->enhanceBodyWithAttachments($body, $mail->getAttachments());
-
-    $content_source = PhabricatorContentSource::newForSource(
-      PhabricatorContentSource::SOURCE_EMAIL,
-      array(
-        'id' => $mail->getID(),
-      ));
-
-    $lines = explode("\n", trim($body));
-    $first_line = head($lines);
 
     $xactions = array();
-
-    $commands = $body_data['commands'];
     foreach ($commands as $command) {
       switch (head($command)) {
         case 'unsubscribe':
@@ -48,19 +28,7 @@ final class PasteReplyHandler extends PhabricatorMailReplyHandler {
       }
     }
 
-    $xactions[] = id(new PhabricatorPasteTransaction())
-      ->setTransactionType(PhabricatorTransactions::TYPE_COMMENT)
-      ->attachComment(
-       id(new PhabricatorPasteTransactionComment())
-        ->setContent($body));
-
-    $editor = id(new PhabricatorPasteEditor())
-      ->setActor($actor)
-      ->setContentSource($content_source)
-      ->setContinueOnNoEffect(true)
-      ->setIsPreview(false);
-
-    $editor->applyTransactions($paste, $xactions);
+    return $xactions;
   }
 
 }

src/applications/transactions/replyhandler/PhabricatorApplicationTransactionReplyHandler.php

@@ -0,0 +1,92 @@
+<?php
+
+abstract class PhabricatorApplicationTransactionReplyHandler
+  extends PhabricatorMailReplyHandler {
+
+  abstract public function getObjectPrefix();
+
+  public function getPrivateReplyHandlerEmailAddress(
+    PhabricatorObjectHandle $handle) {
+    return $this->getDefaultPrivateReplyHandlerEmailAddress(
+      $handle,
+      $this->getObjectPrefix());
+  }
+
+  public function getPublicReplyHandlerEmailAddress() {
+    return $this->getDefaultPublicReplyHandlerEmailAddress(
+      $this->getObjectPrefix());
+  }
+
+  private function newEditor(PhabricatorMetaMTAReceivedMail $mail) {
+    $content_source = PhabricatorContentSource::newForSource(
+      PhabricatorContentSource::SOURCE_EMAIL,
+      array(
+        'id' => $mail->getID(),
+      ));
+
+    $editor = $this->getMailReceiver()
+      ->getApplicationTransactionEditor()
+      ->setActor($this->getActor())
+      ->setContentSource($content_source)
+      ->setContinueOnMissingFields(true)
+      ->setParentMessageID($mail->getMessageID())
+      ->setExcludeMailRecipientPHIDs($this->getExcludeMailRecipientPHIDs());
+
+    if ($this->getApplicationEmail()) {
+      $editor->setApplicationEmail($this->getApplicationEmail());
+    }
+
+    return $editor;
+  }
+
+  private function newTransaction() {
+    return $this->getMailReceiver()->getApplicationTransactionTemplate();
+  }
+
+  final protected function receiveEmail(PhabricatorMetaMTAReceivedMail $mail) {
+    $viewer = $this->getActor();
+    $object = $this->getMailReceiver();
+
+    $body_data = $mail->parseBody();
+
+    $xactions = $this->processMailCommands($body_data['commands']);
+
+    // If this object is subscribable, subscribe all the users who were
+    // CC'd on the message.
+    if ($object instanceof PhabricatorSubscribableInterface) {
+      $subscriber_phids = $mail->loadCCPHIDs();
+      if ($subscriber_phids) {
+        $xactions[] = $this->newTransaction()
+          ->setTransactionType(PhabricatorTransactions::TYPE_SUBSCRIBERS)
+          ->setNewValue(
+            array(
+              '+' => array($viewer->getPHID()),
+            ));
+      }
+    }
+
+    $body = $body_data['body'];
+    $body = $this->enhanceBodyWithAttachments($body, $mail->getAttachments());
+
+    $comment = $this
+      ->newTransaction()
+      ->getApplicationTransactionCommentObject()
+      ->setContent($body);
+
+    $xactions[] = $this->newTransaction()
+      ->setTransactionType(PhabricatorTransactions::TYPE_COMMENT)
+      ->attachComment($comment);
+
+    $target = $object->getApplicationTransactionObject();
+
+    $this->newEditor($mail)
+      ->setContinueOnNoEffect(true)
+      ->applyTransactions($target, $xactions);
+  }
+
+  protected function processMailCommands(array $commands) {
+    // TODO: Modularize this.
+    return array();
+  }
+
+}