Disabled Uninstall state for essential applications

Summary: Disabled Uninstall state for essential applications of Phabricator. Information provided why they cannot uninstall these applications. Also take care of users trying to install an application which cannot be uninstalled by editing the URI.

Test Plan: Manually tested

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D4743

src/applications/meta/controller/PhabricatorApplicationDetailViewController.php

@@ -64,30 +64,38 @@ final class PhabricatorApplicationDetailViewController
   private function buildActionView(
     PhabricatorUser $user, PhabricatorApplication $selected) {
 
+    $view = id(new PhabricatorActionListView())
+          ->setUser($user);
+
     if ($selected->canUninstall()) {
       if ($selected->isInstalled()) {
-
-        return id(new PhabricatorActionListView())
-          ->setUser($user)
-          ->addAction(
-            id(new PhabricatorActionView())
-              ->setName(pht('Uninstall'))
-              ->setIcon('delete')
-              ->setHref(
+        $view->addAction(
+               id(new PhabricatorActionView())
+               ->setName(pht('Uninstall'))
+               ->setIcon('delete')
+               ->setHref(
                 $this->getApplicationURI(get_class($selected).'/uninstall/'))
-              );
+               );
       } else {
-          return id(new PhabricatorActionListView())
-            ->setUser($user)
-            ->addAction(
-              id(new PhabricatorActionView())
-              ->setName(pht('Install'))
-              ->setIcon('new')
-              ->setHref(
-                $this->getApplicationURI(get_class($selected).'/install/'))
-              );
+        $view->addAction(
+               id(new PhabricatorActionView())
+               ->setName(pht('Install'))
+               ->setIcon('new')
+               ->setHref(
+                 $this->getApplicationURI(get_class($selected).'/install/'))
+               );
       }
+    } else {
+      $view->addAction(
+             id(new PhabricatorActionView())
+             ->setName(pht('Uninstall'))
+             ->setIcon('delete')
+             ->setDisabled(true)
+             ->setHref(
+               $this->getApplicationURI(get_class($selected).'/uninstall/'))
+             );
     }
+    return $view;
   }
 
 }

src/applications/meta/controller/PhabricatorApplicationUninstallController.php

@@ -17,7 +17,7 @@ final class PhabricatorApplicationUninstallController
 
     $selected = PhabricatorApplication::getByClass($this->application);
 
-    if (!$selected || !$selected->canUninstall()) {
+    if (!$selected) {
       return new Aphront404Response();
     }
 
@@ -26,27 +26,37 @@ final class PhabricatorApplicationUninstallController
      return id(new AphrontRedirectResponse())->setURI('/applications/');
     }
 
+    $dialog = id(new AphrontDialogView())
+               ->setUser($user)
+               ->addCancelButton('/applications/view/'.$this->application);
+
     if ($this->action == 'install') {
+      if ($selected->canUninstall()) {
+        $dialog->setTitle('Confirmation')
+               ->appendChild(
+                 'Install '. $selected->getName(). ' application ?'
+                 )
+               ->addSubmitButton('Install');
 
-      $dialog = id(new AphrontDialogView())
-             ->setUser($user)
-             ->setTitle('Confirmation')
-             ->appendChild(
-               'Install '. $selected->getName(). ' application ?'
-               )
-             ->addSubmitButton('Install')
-             ->addCancelButton('/applications/view/'.$this->application);
+      } else {
+        $dialog->setTitle('Information')
+               ->appendChild('You cannot install a installed application.');
+      }
     } else {
-      $dialog = id(new AphrontDialogView())
-             ->setUser($user)
-             ->setTitle('Confirmation')
-             ->appendChild(
-               'Really Uninstall '. $selected->getName(). ' application ?'
-               )
-             ->addSubmitButton('Uninstall')
-             ->addCancelButton('/applications/view/'.$this->application);
+      if ($selected->canUninstall()) {
+        $dialog->setTitle('Confirmation')
+               ->appendChild(
+                 'Really Uninstall '. $selected->getName(). ' application ?'
+                 )
+               ->addSubmitButton('Uninstall');
+      } else {
+        $dialog->setTitle('Information')
+               ->appendChild(
+                 'This application cannot be uninstalled,
+                 because it is required for Phabricator to work.'
+                 );
+      }
     }
-
     return id(new AphrontDialogResponse())->setDialog($dialog);
   }