Expose "Abandon Revision" to non-authors with a config flag.

Summary: Fixes T4720. Allows non-authors to permanently reject a differential by exposing the "Abandon Revision" action via a configuration flag.

Test Plan: {F161434}

Reviewers: #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: epriestley, Korvin

Maniphest Tasks: T4720

Differential Revision: https://secure.phabricator.com/D9306

conf/default.conf.php

@@ -811,6 +811,10 @@ return array(
   // only the submitter can close a revision.
   'differential.always-allow-close' => false,
 
+  // If you set this to true, any user can abandon any revision. If false, only
+  // the submitter can abandon a revision.
+  'differential.always-allow-abandon' => false,
+
   // If you set this to true, any user can reopen a revision so long as it has
   // been closed.  This can be useful if a revision is accidentally closed or
   // if a developer changes his or her mind after closing a revision.  If it is

src/applications/differential/config/PhabricatorDifferentialConfigOptions.php

@@ -165,6 +165,17 @@ final class PhabricatorDifferentialConfigOptions
             "where the reviewer is often the actual committer can benefit ".
             "from turning this option to true. If false, only the submitter ".
             "can close a revision.")),
+      $this->newOption('differential.always-allow-abandon', 'bool', false)
+        ->setBoolOptions(
+          array(
+            pht('Allow any user'),
+            pht('Restrict to submitter'),
+          ))
+        ->setSummary(pht('Allows any user to abandon revisions.'))
+        ->setDescription(
+          pht(
+            'If you set this to true, any user can abandon any revision. If '.
+            'false, only the submitter can abandon a revision.')),
       $this->newOption('differential.allow-reopen', 'bool', false)
         ->setBoolOptions(
           array(

src/applications/differential/controller/DifferentialRevisionViewController.php

@@ -553,6 +553,8 @@ final class DifferentialRevisionViewController extends DifferentialController {
 
     $allow_self_accept = PhabricatorEnv::getEnvConfig(
       'differential.allow-self-accept');
+    $always_allow_abandon = PhabricatorEnv::getEnvConfig(
+      'differential.always-allow-abandon');
     $always_allow_close = PhabricatorEnv::getEnvConfig(
       'differential.always-allow-close');
     $allow_reopen = PhabricatorEnv::getEnvConfig(
@@ -586,17 +588,20 @@ final class DifferentialRevisionViewController extends DifferentialController {
     } else {
       switch ($status) {
         case ArcanistDifferentialRevisionStatus::NEEDS_REVIEW:
+          $actions[DifferentialAction::ACTION_ABANDON] = $always_allow_abandon;
           $actions[DifferentialAction::ACTION_ACCEPT] = true;
           $actions[DifferentialAction::ACTION_REJECT] = true;
           $actions[DifferentialAction::ACTION_RESIGN] = $viewer_is_reviewer;
           break;
         case ArcanistDifferentialRevisionStatus::NEEDS_REVISION:
         case ArcanistDifferentialRevisionStatus::CHANGES_PLANNED:
+          $actions[DifferentialAction::ACTION_ABANDON] = $always_allow_abandon;
           $actions[DifferentialAction::ACTION_ACCEPT] = true;
           $actions[DifferentialAction::ACTION_REJECT] = !$viewer_has_rejected;
           $actions[DifferentialAction::ACTION_RESIGN] = $viewer_is_reviewer;
           break;
         case ArcanistDifferentialRevisionStatus::ACCEPTED:
+          $actions[DifferentialAction::ACTION_ABANDON] = $always_allow_abandon;
           $actions[DifferentialAction::ACTION_ACCEPT] = !$viewer_has_accepted;
           $actions[DifferentialAction::ACTION_REJECT] = true;
           $actions[DifferentialAction::ACTION_RESIGN] = $viewer_is_reviewer;

src/applications/differential/editor/DifferentialTransactionEditor.php

@@ -789,6 +789,9 @@ final class DifferentialTransactionEditor
     $actor_phid = $this->getActor()->getPHID();
     $actor_is_author = ($author_phid == $actor_phid);
 
+    $config_abandon_key = 'differential.always-allow-abandon';
+    $always_allow_abandon = PhabricatorEnv::getEnvConfig($config_abandon_key);
+
     $config_close_key = 'differential.always-allow-close';
     $always_allow_close = PhabricatorEnv::getEnvConfig($config_close_key);
 
@@ -860,7 +863,7 @@ final class DifferentialTransactionEditor
         break;
 
       case DifferentialAction::ACTION_ABANDON:
-        if (!$actor_is_author) {
+        if (!$actor_is_author && !$always_allow_abandon) {
           return pht(
             "You can not abandon this revision because you do not own it. ".
             "You can only abandon revisions you own.");