Allow to uninstall (hide) Audit application

Summary:
While many Phorge applications can be uninstalled (such as Differential for pre-merge commit review), this has not been the case for Audit (post-merge commit review) since rP11861265fe94fa97e4d0563c5bdb7b8cac27282d.

In installations which do not use Audit in their workflows, exposing Audit related UI elements creates additional clutter and complexity.

Fixes T15129

Test Plan:
* Go to `/applications/view/PhabricatorAuditApplication/` and click "Uninstall"
* View an individual merged commit in Diffusion, click "Edit Commit" in the sidebar to go to `/diffusion/commit/edit/1/`, see that "Auditors" datasource is not displayed
* View an individual merged commit in Diffusion, click the "Add Action..." dropdown, see that the "Audit Action" section and its entries "Accept Commit" and "Raise Concern" are not displayed
* View an individual merged commit in Diffusion, click the "Add Action..." dropdown, see that the "Change Auditors" entry is not displayed
* Go to `/conduit/` and see that the API method "audit.query" and the entire section "audit" is not displayed
* Go to `/diffusion/commit/` and see no "Active Audits" and "Audited" searches in the left side bar
* Go to `/diffusion/commit/query/all/` and see that no "Auditors" entry is shown for each commit
* Go to `/diffusion/commit/query/all/` and see that no audit related entry is shown in the grey column on the right (if Harbormaster is not installed, there will be no grey column at all)
* Go to `/herald/edit/?content_type=commit&rule_type=global` and see that no Condition entry "Auditors" and no Condition entry "Affected packages that need audit" is displayed
* Go to `/herald/edit/?content_type=commit&rule_type=personal` and see that no "Add me as an auditor" Herald action and no "Added Auditors" Herald condition is displayed

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15129

Differential Revision: https://we.phorge.it/D25503

src/applications/audit/application/PhabricatorAuditApplication.php

@@ -19,9 +19,7 @@ final class PhabricatorAuditApplication extends PhabricatorApplication {
   }
 
   public function canUninstall() {
-    // Audit was once a separate application, but has largely merged with
-    // Diffusion.
-    return false;
+    return true;
   }
 
   public function isPinnedByDefault(PhabricatorUser $viewer) {

src/applications/audit/conduit/AuditConduitAPIMethod.php

@@ -4,7 +4,7 @@ abstract class AuditConduitAPIMethod extends ConduitAPIMethod {
 
   final public function getApplication() {
     return PhabricatorApplication::getByClass(
-      'PhabricatorDiffusionApplication');
+      'PhabricatorAuditApplication');
   }
 
 }

src/applications/audit/query/PhabricatorCommitSearchEngine.php

@@ -70,6 +70,7 @@ final class PhabricatorCommitSearchEngine
   }
 
   protected function buildCustomSearchFields() {
+    $show_audit_fields = (id(new PhabricatorAuditApplication())->isInstalled());
     $show_packages = PhabricatorApplication::isClassInstalled(
       'PhabricatorPackagesApplication');
     return array(
@@ -95,6 +96,7 @@ final class PhabricatorCommitSearchEngine
         ->setConduitKey('auditors')
         ->setAliases(array('auditor', 'auditors', 'auditorPHID'))
         ->setDatasource(new DiffusionAuditorFunctionDatasource())
+        ->setIsHidden(!$show_audit_fields)
         ->setDescription(
           pht(
             'Find commits where given users, projects, or packages are '.
@@ -106,6 +108,7 @@ final class PhabricatorCommitSearchEngine
         ->setOptions(DiffusionCommitAuditStatus::newOptions())
         ->setDeprecatedOptions(
           DiffusionCommitAuditStatus::newDeprecatedOptions())
+        ->setIsHidden(!$show_audit_fields)
         ->setDescription(pht('Find commits with given audit statuses.')),
       id(new PhabricatorSearchDatasourceField())
         ->setLabel(pht('Repositories'))
@@ -172,10 +175,14 @@ final class PhabricatorCommitSearchEngine
     $names = array();
 
     if ($this->requireViewer()->isLoggedIn()) {
+      if (id(new PhabricatorAuditApplication())->isInstalled()) {
         $names['active'] = pht('Active Audits');
+      }
       $names['authored'] = pht('Authored');
+      if (id(new PhabricatorAuditApplication())->isInstalled()) {
         $names['audited'] = pht('Audited');
       }
+    }
 
     $names['all'] = pht('All Commits');
 
@@ -224,9 +231,11 @@ final class PhabricatorCommitSearchEngine
 
     $bucket = $this->getResultBucket($query);
 
+    // hide "Auditors" on /diffusion/commit/query/all/ if Audit not installed
+    $show_auditors = id(new PhabricatorAuditApplication())->isInstalled();
     $template = id(new DiffusionCommitGraphView())
       ->setViewer($viewer)
-      ->setShowAuditors(true);
+      ->setShowAuditors($show_auditors);
 
     $views = array();
     if ($bucket) {

src/applications/diffusion/editor/DiffusionCommitEditEngine.php

@@ -100,7 +100,9 @@ final class DiffusionCommitEditEngine
     $data = $object->getCommitData();
 
     $fields = array();
-
+    // remove "Change Auditors" from "Add Action" dropdown etc
+    // if Audit is not installed
+    if (id(new PhabricatorAuditApplication())->isInstalled()) {
       $fields[] = id(new PhabricatorDatasourceEditField())
         ->setKey('auditors')
         ->setLabel(pht('Auditors'))
@@ -113,6 +115,7 @@ final class DiffusionCommitEditEngine
         ->setConduitDescription(pht('Change the auditors for this commit.'))
         ->setConduitTypeDescription(pht('New auditors.'))
         ->setValue($object->getAuditorPHIDsForEdit());
+    }
 
     $actions = DiffusionCommitActionTransaction::loadAllActions();
     $actions = msortv($actions, 'getCommitActionOrderVector');

src/applications/diffusion/herald/DiffusionAuditorsAddAuditorsHeraldAction.php

@@ -9,8 +9,13 @@ final class DiffusionAuditorsAddAuditorsHeraldAction
     return pht('Add auditors');
   }
 
+  // hide "Add auditors" Herald action if Audit not installed
   public function supportsRuleType($rule_type) {
+    if (id(new PhabricatorAuditApplication())->isInstalled()) {
       return ($rule_type != HeraldRuleTypeConfig::RULE_TYPE_PERSONAL);
+    } else {
+      return false;
+    }
   }
 
   public function applyEffect($object, HeraldEffect $effect) {

src/applications/diffusion/herald/DiffusionAuditorsAddSelfHeraldAction.php

@@ -9,8 +9,13 @@ final class DiffusionAuditorsAddSelfHeraldAction
     return pht('Add me as an auditor');
   }
 
+  // hide "Add me as an auditor" Herald action if Audit not installed
   public function supportsRuleType($rule_type) {
+    if (id(new PhabricatorAuditApplication())->isInstalled()) {
       return ($rule_type == HeraldRuleTypeConfig::RULE_TYPE_PERSONAL);
+    } else {
+      return false;
+    }
   }
 
   public function applyEffect($object, HeraldEffect $effect) {

src/applications/diffusion/herald/DiffusionCommitAuditorsHeraldField.php

@@ -5,6 +5,15 @@ final class DiffusionCommitAuditorsHeraldField
 
   const FIELDCONST = 'diffusion.commit.auditors';
 
+  // hide "Auditors" Herald condition if Audit not installed
+  public function supportsObject($object) {
+    if (id(new PhabricatorAuditApplication())->isInstalled()) {
+      return ($object instanceof PhabricatorRepositoryCommit);
+    } else {
+      return false;
+    }
+  }
+
   public function getHeraldFieldName() {
     return pht('Auditors');
   }

src/applications/diffusion/herald/DiffusionCommitPackageAuditHeraldField.php

@@ -5,6 +5,16 @@ final class DiffusionCommitPackageAuditHeraldField
 
   const FIELDCONST = 'diffusion.commit.package.audit';
 
+  // hide "Affected packages that need audit" Herald condition
+  // if Audit not installed
+  public function supportsObject($object) {
+    if (id(new PhabricatorAuditApplication())->isInstalled()) {
+      return ($object instanceof PhabricatorRepositoryCommit);
+    } else {
+      return false;
+    }
+  }
+
   public function getHeraldFieldName() {
     return pht('Affected packages that need audit');
   }

src/applications/diffusion/view/DiffusionCommitGraphView.php

@@ -169,7 +169,10 @@ final class DiffusionCommitGraphView
         $this->addBuildAction($item_view, $hash);
       }
 
+      // hide Audit entry on /diffusion/commit/query/all if Audit not installed
+      if (id(new PhabricatorAuditApplication())->isInstalled()) {
         $this->addAuditAction($item_view, $hash);
+      }
 
       if ($show_auditors) {
         $auditor_list = $item_view->newMapView();

src/applications/diffusion/xaction/DiffusionCommitActionTransaction.php

@@ -8,6 +8,9 @@ abstract class DiffusionCommitActionTransaction
   }
 
   public function isActionAvailable($object, PhabricatorUser $viewer) {
+    if (!id(new PhabricatorAuditApplication())->isInstalled()) {
+      return false;
+    }
     try {
       $this->validateAction($object, $viewer);
       return true;

src/applications/search/engine/PhabricatorApplicationSearchEngine.php

@@ -275,6 +275,7 @@ abstract class PhabricatorApplicationSearchEngine extends Phobject {
         ->setOptions($orders);
     }
 
+    if (id(new PhabricatorAuditApplication())->isInstalled()) {
       $buckets = $this->newResultBuckets();
       if ($query && $buckets) {
         $bucket_options = array(
@@ -286,6 +287,7 @@ abstract class PhabricatorApplicationSearchEngine extends Phobject {
           ->setKey('bucket')
           ->setOptions($bucket_options);
       }
+    }
 
     $field_map = array();
     foreach ($fields as $field) {