Ref T6049, Add Phurl URL create capability

Summary: Ref T6049, Add Phurl URL create capability

Test Plan:
- Change {nav Home > Applications > Phurl > Configure} to allow no one to create Phurl URLs
- Attempt {nav Phurl > Shorten URL}. Should not be able to create a Phurl.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Maniphest Tasks: T6049

Differential Revision: https://secure.phabricator.com/D14510

src/__phutil_library_map__.php

···
     'PhabricatorPhurlURL' => 'applications/phurl/storage/PhabricatorPhurlURL.php',
     'PhabricatorPhurlURLAccessController' => 'applications/phurl/controller/PhabricatorPhurlURLAccessController.php',
     'PhabricatorPhurlURLCommentController' => 'applications/phurl/controller/PhabricatorPhurlURLCommentController.php',
+    'PhabricatorPhurlURLCreateCapability' => 'applications/phurl/capability/PhabricatorPhurlURLCreateCapability.php',
     'PhabricatorPhurlURLEditController' => 'applications/phurl/controller/PhabricatorPhurlURLEditController.php',
     'PhabricatorPhurlURLEditor' => 'applications/phurl/editor/PhabricatorPhurlURLEditor.php',
     'PhabricatorPhurlURLListController' => 'applications/phurl/controller/PhabricatorPhurlURLListController.php',
···
     ),
     'PhabricatorPhurlURLAccessController' => 'PhabricatorPhurlController',
     'PhabricatorPhurlURLCommentController' => 'PhabricatorPhurlController',
+    'PhabricatorPhurlURLCreateCapability' => 'PhabricatorPolicyCapability',
     'PhabricatorPhurlURLEditController' => 'PhabricatorPhurlController',
     'PhabricatorPhurlURLEditor' => 'PhabricatorApplicationTransactionEditor',
     'PhabricatorPhurlURLListController' => 'PhabricatorPhurlController',

src/applications/phurl/application/PhabricatorPhurlApplication.php

···
     );
   }
 
+  protected function getCustomCapabilities() {
+    return array(
+      PhabricatorPhurlURLCreateCapability::CAPABILITY => array(
+        'default' => PhabricatorPolicies::POLICY_USER,
+      ),
+    );
+  }
+
 }

src/applications/phurl/capability/PhabricatorPhurlURLCreateCapability.php

···
+<?php
+
+final class PhabricatorPhurlURLCreateCapability
+  extends PhabricatorPolicyCapability {
+
+  const CAPABILITY = 'phurl.url.create';
+
+  public function getCapabilityName() {
+    return pht('Can Create Phurl URLs');
+  }
+
+  public function describeCapabilityRejection() {
+    return pht('You do not have permission to create a Phurl URL.');
+  }
+
+}

src/applications/phurl/controller/PhabricatorPhurlController.php

···
 abstract class PhabricatorPhurlController extends PhabricatorController {
 
   protected function buildApplicationCrumbs() {
+    $can_create = $this->hasApplicationCapability(
+      PhabricatorPhurlURLCreateCapability::CAPABILITY);
+
     $crumbs = parent::buildApplicationCrumbs();
     $crumbs->addAction(
       id(new PHUIListItemView())
         ->setName(pht('Shorten URL'))
         ->setHref($this->getApplicationURI().'url/create/')
-        ->setIcon('fa-plus-square'));
+        ->setIcon('fa-plus-square')
+        ->setDisabled(!$can_create)
+        ->setWorkflow(!$can_create));
 
     return $crumbs;
   }

src/applications/phurl/controller/PhabricatorPhurlURLEditController.php

···
     $uri_query = $request->getStr('query');
 
     if ($is_create) {
+      $this->requireApplicationCapability(
+        PhabricatorPhurlURLCreateCapability::CAPABILITY);
+
       $url = PhabricatorPhurlURL::initializeNewPhurlURL(
         $viewer);
       $submit_label = pht('Create');