Implement an "Author's packages" Herald field for Differential

Summary: Ref T13480. Add an "Author's packages" field to Herald to support writing rules like "if affected packages include X, and author's packages do not include X, raise the alarm".

Test Plan: Wrote and executed rules with the field, saw a sensible field value in the transcript.

Maniphest Tasks: T13480

Differential Revision: https://secure.phabricator.com/D20947

src/__phutil_library_map__.php

@@ -603,6 +603,7 @@ phutil_register_library_map(array(
     'DifferentialRevisionActionTransaction' => 'applications/differential/xaction/DifferentialRevisionActionTransaction.php',
     'DifferentialRevisionAffectedFilesHeraldField' => 'applications/differential/herald/DifferentialRevisionAffectedFilesHeraldField.php',
     'DifferentialRevisionAuthorHeraldField' => 'applications/differential/herald/DifferentialRevisionAuthorHeraldField.php',
+    'DifferentialRevisionAuthorPackagesHeraldField' => 'applications/differential/herald/DifferentialRevisionAuthorPackagesHeraldField.php',
     'DifferentialRevisionAuthorProjectsHeraldField' => 'applications/differential/herald/DifferentialRevisionAuthorProjectsHeraldField.php',
     'DifferentialRevisionBuildableTransaction' => 'applications/differential/xaction/DifferentialRevisionBuildableTransaction.php',
     'DifferentialRevisionCloseDetailsController' => 'applications/differential/controller/DifferentialRevisionCloseDetailsController.php',
@@ -6595,6 +6596,7 @@ phutil_register_library_map(array(
     'DifferentialRevisionActionTransaction' => 'DifferentialRevisionTransactionType',
     'DifferentialRevisionAffectedFilesHeraldField' => 'DifferentialRevisionHeraldField',
     'DifferentialRevisionAuthorHeraldField' => 'DifferentialRevisionHeraldField',
+    'DifferentialRevisionAuthorPackagesHeraldField' => 'DifferentialRevisionHeraldField',
     'DifferentialRevisionAuthorProjectsHeraldField' => 'DifferentialRevisionHeraldField',
     'DifferentialRevisionBuildableTransaction' => 'DifferentialRevisionTransactionType',
     'DifferentialRevisionCloseDetailsController' => 'DifferentialController',

src/applications/differential/herald/DifferentialRevisionAuthorPackagesHeraldField.php

@@ -0,0 +1,32 @@
+<?php
+
+final class DifferentialRevisionAuthorPackagesHeraldField
+  extends DifferentialRevisionHeraldField {
+
+  const FIELDCONST = 'differential.revision.author.packages';
+
+  public function getHeraldFieldName() {
+    return pht("Author's packages");
+  }
+
+  public function getHeraldFieldValue($object) {
+    $adapter = $this->getAdapter();
+    $viewer = $adapter->getViewer();
+
+    $packages = id(new PhabricatorOwnersPackageQuery())
+      ->setViewer($viewer)
+      ->withAuthorityPHIDs(array($object->getAuthorPHID()))
+      ->execute();
+
+    return mpull($packages, 'getPHID');
+  }
+
+  protected function getHeraldFieldStandardType() {
+    return self::STANDARD_PHID_LIST;
+  }
+
+  protected function getDatasource() {
+    return new PhabricatorOwnersPackageDatasource();
+  }
+
+}