Allow customizing default Phurl view and edit policies

Summary:
| Before   | After    |
|----------|----------|
|{F2669862}|{F2669861}|

Closes T15970

Test Plan:
* Go to http://phorge.localhost/applications/view/PhabricatorPhurlApplication/ and see two additional settings "Default View Policy" and "Default Edit Policy"
* Go to http://phorge.localhost/applications/view/PhabricatorPhurlApplication/ and select "Edit Policies" to see and set two additional settings
* Go to http://phorge.localhost/phurl/url/edit/form/default/ and check the "Visible To" and "Editable By" fields now showing the default page
* Check existing Phurls which did not have their policies changed as that's stored in the database
* run `arc liberate` again and see that it's already updated

Reviewers: O1 Blessed Committers, aklapper, valerio.bozzolan

Reviewed By: O1 Blessed Committers, aklapper, valerio.bozzolan

Subscribers: aklapper, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15970

Differential Revision: https://we.phorge.it/D25850

src/__phutil_library_map__.php

@@ -4262,6 +4262,8 @@ phutil_register_library_map(array(
     'PhabricatorPhurlURLAliasTransaction' => 'applications/phurl/xaction/PhabricatorPhurlURLAliasTransaction.php',
     'PhabricatorPhurlURLCreateCapability' => 'applications/phurl/capability/PhabricatorPhurlURLCreateCapability.php',
     'PhabricatorPhurlURLDatasource' => 'applications/phurl/typeahead/PhabricatorPhurlURLDatasource.php',
+    'PhabricatorPhurlURLDefaultEditCapability' => 'applications/phurl/capability/PhabricatorPhurlURLDefaultEditCapability.php',
+    'PhabricatorPhurlURLDefaultViewCapability' => 'applications/phurl/capability/PhabricatorPhurlURLDefaultViewCapability.php',
     'PhabricatorPhurlURLDescriptionTransaction' => 'applications/phurl/xaction/PhabricatorPhurlURLDescriptionTransaction.php',
     'PhabricatorPhurlURLEditConduitAPIMethod' => 'applications/phurl/conduit/PhabricatorPhurlURLEditConduitAPIMethod.php',
     'PhabricatorPhurlURLEditController' => 'applications/phurl/controller/PhabricatorPhurlURLEditController.php',
@@ -10866,6 +10868,8 @@ phutil_register_library_map(array(
     'PhabricatorPhurlURLAliasTransaction' => 'PhabricatorPhurlURLTransactionType',
     'PhabricatorPhurlURLCreateCapability' => 'PhabricatorPolicyCapability',
     'PhabricatorPhurlURLDatasource' => 'PhabricatorTypeaheadDatasource',
+    'PhabricatorPhurlURLDefaultEditCapability' => 'PhabricatorPolicyCapability',
+    'PhabricatorPhurlURLDefaultViewCapability' => 'PhabricatorPolicyCapability',
     'PhabricatorPhurlURLDescriptionTransaction' => 'PhabricatorPhurlURLTransactionType',
     'PhabricatorPhurlURLEditConduitAPIMethod' => 'PhabricatorEditEngineAPIMethod',
     'PhabricatorPhurlURLEditController' => 'PhabricatorPhurlController',

src/applications/phurl/application/PhabricatorPhurlApplication.php

@@ -73,6 +73,15 @@ final class PhabricatorPhurlApplication extends PhabricatorApplication {
       PhabricatorPhurlURLCreateCapability::CAPABILITY => array(
         'default' => PhabricatorPolicies::POLICY_USER,
       ),
+      PhabricatorPhurlURLDefaultViewCapability::CAPABILITY => array(
+        'template' => PhabricatorPhurlURLPHIDType::TYPECONST,
+        'capability' => PhabricatorPolicyCapability::CAN_VIEW,
+      ),
+      PhabricatorPhurlURLDefaultEditCapability::CAPABILITY => array(
+        'default' => PhabricatorPolicies::POLICY_USER,
+        'template' => PhabricatorPhurlURLPHIDType::TYPECONST,
+        'capability' => PhabricatorPolicyCapability::CAN_EDIT,
+      ),
     );
   }
 

src/applications/phurl/capability/PhabricatorPhurlURLDefaultEditCapability.php

@@ -0,0 +1,12 @@
+<?php
+
+final class PhabricatorPhurlURLDefaultEditCapability
+  extends PhabricatorPolicyCapability {
+
+  const CAPABILITY = 'phurl.url.default.edit';
+
+  public function getCapabilityName() {
+    return pht('Default Edit Policy');
+  }
+
+}

src/applications/phurl/capability/PhabricatorPhurlURLDefaultViewCapability.php

@@ -0,0 +1,16 @@
+<?php
+
+final class PhabricatorPhurlURLDefaultViewCapability
+  extends PhabricatorPolicyCapability {
+
+  const CAPABILITY = 'phurl.url.default.view';
+
+  public function getCapabilityName() {
+    return pht('Default View Policy');
+  }
+
+  public function shouldAllowPublicPolicySetting() {
+    return true;
+  }
+
+}

src/applications/phurl/storage/PhabricatorPhurlURL.php

@@ -34,10 +34,15 @@ final class PhabricatorPhurlURL extends PhabricatorPhurlDAO
       ->withClasses(array('PhabricatorPhurlApplication'))
       ->executeOne();
 
+    $view_policy = $app->getPolicy(
+      PhabricatorPhurlURLDefaultViewCapability::CAPABILITY);
+    $edit_policy = $app->getPolicy(
+      PhabricatorPhurlURLDefaultEditCapability::CAPABILITY);
+
     return id(new PhabricatorPhurlURL())
       ->setAuthorPHID($actor->getPHID())
-      ->setViewPolicy(PhabricatorPolicies::getMostOpenPolicy())
-      ->setEditPolicy($actor->getPHID())
+      ->setViewPolicy($view_policy)
+      ->setEditPolicy($edit_policy)
       ->setSpacePHID($actor->getDefaultSpacePHID());
   }