Expose commit information via conduit instead of user information

Summary:
After D4825, this information is often available to us in a safe way. Provide it explictly.

This removes or reduces functionality in some cases, but I think we can plug those holes with Conpherence addresses and/or explicit user acknowledgement/config.

Test Plan: Patched a commit with `arc patch` and got the original address out.

Reviewers: btrahan, edward, vrana

Reviewed By: btrahan

CC: aran

Differential Revision: https://secure.phabricator.com/D4828

conf/default.conf.php

@@ -1015,17 +1015,6 @@ return array(
   // interact with the revisions.
   'differential.anonymous-access' => false,
 
-  // If you set this to true, revision author email address information will
-  // be exposed in Conduit. This is useful for Arcanist.
-  //
-  // For example, consider the "arc patch DX" workflow which needs to ask
-  // Differential for the revision DX. This data often should contain
-  // the author's email address, eg "George Washington
-  // <gwashinton@example.com>" when DX is a git or mercurial revision. If this
-  // option is false, Differential defaults to the best it can, something like
-  // "George Washington" or "gwashington".
-  'differential.expose-emails-prudently' => false,
-
   // List of file regexps that should be treated as if they are generated by
   // an automatic process, and thus get hidden by default in differential.
   'differential.generated-paths' => array(

src/applications/differential/conduit/ConduitAPI_differential_getdiff_Method.php

@@ -72,7 +72,6 @@ final class ConduitAPI_differential_getdiff_Method extends ConduitAPIMethod {
       $project_name = null;
     }
     $basic_dict['projectName'] = $project_name;
-    $basic_dict['author'] = $diff->loadAuthorInformation();
 
     return $basic_dict;
   }

src/applications/differential/config/PhabricatorDifferentialConfigOptions.php

@@ -127,28 +127,6 @@ final class PhabricatorDifferentialConfigOptions
             "If you set this to true, users won't need to login to view ".
             "Differential revisions. Anonymous users will have read-only ".
             "access and won't be able to interact with the revisions.")),
-      $this->newOption('differential.expose-emails-prudently', 'bool', false)
-        ->setBoolOptions(
-          array(
-            pht("Expose revision author email address via Conduit"),
-            pht("Don't expose revision author email address via Conduit"),
-          ))
-        ->setSummary(
-          pht(
-            "Determines whether or not the author's email address should be ".
-            "exposed via Conduit."))
-        ->setDescription(
-          pht(
-            "If you set this to true, revision author email address ".
-            "information will be exposed in Conduit. This is useful for ".
-            "Arcanist.\n\n".
-            "For example, consider the 'arc patch DX' workflow which needs ".
-            "to ask Differential for the revision DX. This data often should ".
-            "contain the author's email address, eg 'George Washington ".
-            "<gwashinton@example.com>' when DX is a git or mercurial ".
-            "revision. If this option is false, Differential defaults to the ".
-            "best it can, something like 'George Washington' or ".
-            "'gwashington'.")),
       $this->newOption('differential.generated-paths', 'list<string>', array())
         ->setSummary(pht("File regexps to treat as automatically generated."))
         ->setDescription(

src/applications/differential/storage/DifferentialDiff.php

@@ -240,55 +240,17 @@ final class DifferentialDiff extends DifferentialDAO {
       $this->getID());
     foreach ($properties as $property) {
       $dict['properties'][$property->getName()] = $property->getData();
+
+      if ($property->getName() == 'local:commits') {
+        foreach ($property->getData() as $commit) {
+          $dict['authorName'] = $commit['author'];
+          $dict['authorEmail'] = $commit['authorEmail'];
+          break;
+        }
+      }
     }
 
     return $dict;
   }
 
-  /**
-   * Figures out the right author information for a given diff based on the
-   * repository and Phabricator configuration settings.
-   *
-   * Git is particularly finicky as it requires author information to be in
-   * the format "George Washington <gwashington@example.com>" to
-   * consistently work. If the Phabricator instance isn't configured to
-   * expose emails prudently, then we are unable to get any author information
-   * for git.
-   */
-  public function loadAuthorInformation() {
-    $author = id(new PhabricatorUser())
-      ->loadOneWhere('phid = %s', $this->getAuthorPHID());
-
-    $use_emails =
-      PhabricatorEnv::getEnvConfig('differential.expose-emails-prudently');
-
-    switch ($this->getSourceControlSystem()) {
-      case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
-        if (!$use_emails) {
-          $author_info = '';
-        } else {
-          $author_info = $this->getFullAuthorInfo($author);
-        }
-        break;
-      case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
-        if (!$use_emails) {
-          $author_info = $author->getUsername();
-        } else {
-          $author_info = $this->getFullAuthorInfo($author);
-        }
-       break;
-      case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
-      default:
-        $author_info = $author->getUsername();
-        break;
-    }
-
-    return $author_info;
-  }
-
-  private function getFullAuthorInfo(PhabricatorUser $author) {
-    return sprintf('%s <%s>',
-                   $author->getRealName(),
-                   $author->loadPrimaryEmailAddress());
-  }
 }