When a subscriber can't see an object, clearly show that they're missing the permission in the curtain UI

Summary:
Ref T13602. When a subscriber can't see an object, it's currently hard to figure it out.

Show this status clearly in the curtain UI.

Test Plan: {F8382865}

Maniphest Tasks: T13602

Differential Revision: https://secure.phabricator.com/D21547

resources/celerity/map.php

@@ -9,7 +9,7 @@ return array(
   'names' => array(
     'conpherence.pkg.css' => '0e3cf785',
     'conpherence.pkg.js' => '020aebcf',
-    'core.pkg.css' => '937616c0',
+    'core.pkg.css' => '970b3ceb',
     'core.pkg.js' => 'adc34883',
     'dark-console.pkg.js' => '187792c2',
     'differential.pkg.css' => '5c459f92',
@@ -151,7 +151,7 @@ return array(
     'rsrc/css/phui/phui-comment-form.css' => '68a2d99a',
     'rsrc/css/phui/phui-comment-panel.css' => 'ec4e31c0',
     'rsrc/css/phui/phui-crumbs-view.css' => '614f43cf',
-    'rsrc/css/phui/phui-curtain-object-ref-view.css' => '12404744',
+    'rsrc/css/phui/phui-curtain-object-ref-view.css' => '5f752bdb',
     'rsrc/css/phui/phui-curtain-view.css' => '68c5efb6',
     'rsrc/css/phui/phui-document-pro.css' => 'b9613a10',
     'rsrc/css/phui/phui-document-summary.css' => 'b068eed1',
@@ -845,7 +845,7 @@ return array(
     'phui-comment-form-css' => '68a2d99a',
     'phui-comment-panel-css' => 'ec4e31c0',
     'phui-crumbs-view-css' => '614f43cf',
-    'phui-curtain-object-ref-view-css' => '12404744',
+    'phui-curtain-object-ref-view-css' => '5f752bdb',
     'phui-curtain-view-css' => '68c5efb6',
     'phui-document-summary-view-css' => 'b068eed1',
     'phui-document-view-css' => '52b748a5',

src/applications/phid/PhabricatorObjectHandle.php

@@ -32,6 +32,7 @@ final class PhabricatorObjectHandle
   private $tokenIcon;
   private $commandLineObjectName;
   private $mailStampName;
+  private $capabilities = array();
 
   public function setIcon($icon) {
     $this->icon = $icon;
@@ -388,6 +389,68 @@ final class PhabricatorObjectHandle
     return idx($types, $this->getType());
   }
 
+  public function hasCapabilities() {
+    return ($this->getType() === PhabricatorPeopleUserPHIDType::TYPECONST);
+  }
+
+  public function attachCapability(
+    PhabricatorPolicyInterface $object,
+    $capability,
+    $has_capability) {
+
+    if (!$this->hasCapabilities()) {
+      throw new Exception(
+        pht(
+          'Attempting to attach capability ("%s") for object ("%s") to '.
+          'handle, but this handle (of type "%s") can not have '.
+          'capabilities.',
+          $capability,
+          get_class($object),
+          $this->getType()));
+    }
+
+    $object_key = $this->getObjectCapabilityKey($object);
+    $this->capabilities[$object_key][$capability] = $has_capability;
+
+    return $this;
+  }
+
+  public function hasViewCapability(PhabricatorPolicyInterface $object) {
+    return $this->hasCapability($object, PhabricatorPolicyCapability::CAN_VIEW);
+  }
+
+  private function hasCapability(
+    PhabricatorPolicyInterface $object,
+    $capability) {
+
+    $object_key = $this->getObjectCapabilityKey($object);
+
+    if (!isset($this->capabilities[$object_key][$capability])) {
+      throw new Exception(
+        pht(
+          'Attempting to test capability "%s" for handle of type "%s", but '.
+          'this capability has not been attached.',
+          $capability,
+          $this->getType()));
+    }
+
+    return $this->capabilities[$object_key][$capability];
+  }
+
+  private function getObjectCapabilityKey(PhabricatorPolicyInterface $object) {
+    $object_phid = $object->getPHID();
+
+    if (!$object_phid) {
+      throw new Exception(
+        pht(
+          'Object (of class "%s") has no PHID, so handles can not interact '.
+          'with capabilities for it.',
+          get_class($object)));
+    }
+
+    return $object_phid;
+  }
+
 
 /* -(  PhabricatorPolicyInterface  )----------------------------------------- */
 

src/applications/policy/filter/PhabricatorPolicyFilterSet.php

@@ -102,4 +102,66 @@ final class PhabricatorPolicyFilterSet
     $this->queue = array();
   }
 
+  public static function loadHandleViewCapabilities(
+    $viewer,
+    $handles,
+    array $objects) {
+
+    $capabilities = array(
+      PhabricatorPolicyCapability::CAN_VIEW,
+    );
+
+    assert_instances_of($objects, 'PhabricatorPolicyInterface');
+
+    if (!$objects) {
+      return;
+    }
+
+    $viewer_map = array();
+    foreach ($handles as $handle_key => $handle) {
+      if (!$handle->hasCapabilities()) {
+        continue;
+      }
+      $viewer_map[$handle->getPHID()] = $handle_key;
+    }
+
+    if (!$viewer_map) {
+      return;
+    }
+
+    $users = id(new PhabricatorPeopleQuery())
+      ->setViewer($viewer)
+      ->withPHIDs(array_keys($viewer_map))
+      ->execute();
+    $users = mpull($users, null, 'getPHID');
+
+    $filter_set = new self();
+
+    foreach ($users as $user_phid => $user) {
+      foreach ($objects as $object) {
+        foreach ($capabilities as $capability) {
+          $filter_set->addCapability($user, $object, $capability);
+        }
+      }
+    }
+
+    foreach ($users as $user_phid => $user) {
+      $handle_key = $viewer_map[$user_phid];
+      $handle = $handles[$handle_key];
+      foreach ($objects as $object) {
+        foreach ($capabilities as $capability) {
+          $has_capability = $filter_set->hasCapability(
+            $user,
+            $object,
+            $capability);
+
+          $handle->attachCapability(
+            $object,
+            $capability,
+            $has_capability);
+        }
+      }
+    }
+  }
+
 }

src/applications/subscriptions/engineextension/PhabricatorSubscriptionsCurtainExtension.php

@@ -62,17 +62,30 @@ final class PhabricatorSubscriptionsCurtainExtension
       $handles = $viewer->loadHandles($visible_phids);
     }
 
+    PhabricatorPolicyFilterSet::loadHandleViewCapabilities(
+      $viewer,
+      $handles,
+      array($object));
+
     $ref_list = id(new PHUICurtainObjectRefListView())
       ->setViewer($viewer)
       ->setEmptyMessage(pht('None'));
 
     foreach ($visible_phids as $phid) {
+      $handle = $handles[$phid];
+
       $ref = $ref_list->newObjectRefView()
-        ->setHandle($handles[$phid]);
+        ->setHandle($handle);
 
       if ($phid === $viewer_phid) {
         $ref->setHighlighted(true);
       }
+
+      if ($handle->hasCapabilities()) {
+        if (!$handle->hasViewCapability($object)) {
+          $ref->setExiled(true);
+        }
+      }
     }
 
     if ($show_all) {

src/view/phui/PHUICurtainObjectRefView.php

@@ -6,6 +6,7 @@ final class PHUICurtainObjectRefView
   private $handle;
   private $epoch;
   private $highlighted;
+  private $exiled;
 
   public function setHandle(PhabricatorObjectHandle $handle) {
     $this->handle = $handle;
@@ -22,6 +23,11 @@ final class PHUICurtainObjectRefView
     return $this;
   }
 
+  public function setExiled($is_exiled) {
+    $this->exiled = $is_exiled;
+    return $this;
+  }
+
   protected function getTagAttributes() {
     $classes = array();
     $classes[] = 'phui-curtain-object-ref-view';
@@ -29,6 +35,11 @@ final class PHUICurtainObjectRefView
     if ($this->highlighted) {
       $classes[] = 'phui-curtain-object-ref-view-highlighted';
     }
+
+    if ($this->exiled) {
+      $classes[] = 'phui-curtain-object-ref-view-exiled';
+    }
+
     $classes = implode(' ', $classes);
 
     return array(
@@ -60,6 +71,24 @@ final class PHUICurtainObjectRefView
       $more_rows[] = phutil_tag('tr', array(), $epoch_cells);
     }
 
+    if ($this->exiled) {
+      $exiled_view = array(
+        id(new PHUIIconView())->setIcon('fa-eye-slash red'),
+        ' ',
+        pht('No View Permission'),
+      );
+
+      $exiled_cells = array();
+      $exiled_cells[] = phutil_tag(
+        'td',
+        array(
+          'class' => 'phui-curtain-object-ref-view-exiled-cell',
+        ),
+        $exiled_view);
+
+      $more_rows[] = phutil_tag('tr', array(), $exiled_cells);
+    }
+
     $header_cells = array();
 
     $image_view = $this->newImage();

webroot/rsrc/css/phui/phui-curtain-object-ref-view.css

@@ -12,6 +12,10 @@
   border-radius: 3px;
 }
 
+.phui-curtain-object-ref-view + .phui-curtain-object-ref-view {
+  margin-top: 1px;
+}
+
 .phui-curtain-object-ref-view-image-cell {
   min-width: 32px;
   padding-bottom: 24px;
@@ -82,3 +86,12 @@
 .phui-curtain-object-ref-view-highlighted {
   background: {$bluebackground};
 }
+
+.phui-curtain-object-ref-view-exiled  {
+  background: {$lightred};
+  opacity: 0.75;
+}
+
+.phui-curtain-object-ref-view-exiled-cell {
+  color: {$red};
+}