Provide $request->getUser() for Conduit API Requests

Summary:
Allow Conduit methods to retrieve the authoritative, logged-in user
identity.

Test Plan:
Ran user.whoami (an authenticated method) and got my info back. Ran
conduit.connect (an unauthenticated method) and the world did not explode.

Reviewed By: tuomaspelkonen
Reviewers: tuomaspelkonen
CC: tuomaspelkonen, epriestley
Differential Revision: 113

src/__phutil_library_map__.php

@@ -87,6 +87,7 @@ phutil_register_library_map(array(
     'ConduitAPI_differential_updaterevision_Method' => 'applications/conduit/method/differential/updaterevision',
     'ConduitAPI_file_upload_Method' => 'applications/conduit/method/file/upload',
     'ConduitAPI_user_find_Method' => 'applications/conduit/method/user/find',
+    'ConduitAPI_user_whoami_Method' => 'applications/conduit/method/user/whoami',
     'ConduitException' => 'applications/conduit/protocol/exception',
     'DarkConsole' => 'aphront/console/api',
     'DarkConsoleConfigPlugin' => 'aphront/console/plugin/config',
@@ -526,6 +527,7 @@ phutil_register_library_map(array(
     'ConduitAPI_differential_updaterevision_Method' => 'ConduitAPIMethod',
     'ConduitAPI_file_upload_Method' => 'ConduitAPIMethod',
     'ConduitAPI_user_find_Method' => 'ConduitAPIMethod',
+    'ConduitAPI_user_whoami_Method' => 'ConduitAPIMethod',
     'DarkConsoleConfigPlugin' => 'DarkConsolePlugin',
     'DarkConsoleController' => 'PhabricatorController',
     'DarkConsoleErrorLogPlugin' => 'DarkConsolePlugin',

src/applications/conduit/controller/api/PhabricatorConduitAPIController.php

@@ -79,44 +79,16 @@ class PhabricatorConduitAPIController
       $metadata = idx($params, '__conduit__', array());
       unset($params['__conduit__']);
 
+      $result = null;
+
       $api_request = new ConduitAPIRequest($params);
 
-      if ($request->getUser()->getPHID()) {
-        $auth_okay = true;
-      } else if (!$method_handler->shouldRequireAuthentication()) {
-        $auth_okay = true;
-      } else {
-        $session_key = idx($metadata, 'sessionKey');
-        if (!$session_key) {
-          $auth_okay = false;
-          $error_code = 'ERR-NO-CERTIFICATE';
-          $error_info = "This server requires authentication but your client ".
-                        "is not configured with an authentication ".
-                        "certificate. Please refer to ".
-                        "page http://www.phabricator.com/docs/".
-                        "phabricator/article/".
-                        "Installing_Arcanist_Certificates.html for more info.";
-        } else {
-          $user = new PhabricatorUser();
-          $session = queryfx_one(
-            $user->establishConnection('r'),
-            'SELECT * FROM %T WHERE sessionKey = %s',
-            PhabricatorUser::SESSION_TABLE,
-            $session_key);
-          if (!$session) {
-            $auth_okay = false;
-            $result = null;
-            $error_code = 'ERR-INVALID-SESSION';
-            $error_info = 'Session key is invalid.';
-          } else {
-            // TODO: Make sessions timeout.
-            $auth_okay = true;
-          }
-        }
-        // TODO: When we session, read connectionID from the session table.
+      $auth_error = null;
+      if ($method_handler->shouldRequireAuthentication()) {
+        $auth_error = $this->authenticateUser($api_request, $metadata);
       }
 
-      if ($auth_okay) {
+      if ($auth_error === null) {
         try {
           $result = $method_handler->executeMethod($api_request);
           $error_code = null;
@@ -126,6 +98,8 @@ class PhabricatorConduitAPIController
           $error_code = $ex->getMessage();
           $error_info = $method_handler->getErrorDescription($error_code);
         }
+      } else {
+        list($error_code, $error_info) = $auth_error;
       }
     } catch (Exception $ex) {
       $result = null;
@@ -167,6 +141,65 @@ class PhabricatorConduitAPIController
     }
   }
 
+  /**
+   * Authenticate the client making the request to a Phabricator user account.
+   *
+   * @param   ConduitAPIRequest Request being executed.
+   * @param   dict              Request metadata.
+   * @return  null|pair         Null to indicate successful authentication, or
+   *                            an error code and error message pair.
+   */
+  private function authenticateUser(
+    ConduitAPIRequest $api_request,
+    array $metadata) {
+
+    $request = $this->getRequest();
+
+    if ($request->getUser()->getPHID()) {
+      $api_request->setUser($request->getUser());
+      return null;
+    }
+
+    $session_key = idx($metadata, 'sessionKey');
+    if (!$session_key) {
+      return array(
+        'ERR-NO-CERTIFICATE',
+        'This server requires authentication but your client is not '.
+        'configured with an authentication certificate. Please refer to '.
+        '<http://www.phabricator.com/docs/phabricator/article/'.
+        'Installing_Arcanist_Certificates.html> for more info.',
+      );
+    }
+
+    $session = queryfx_one(
+      id(new PhabricatorUser())->establishConnection('r'),
+      'SELECT * FROM %T WHERE sessionKey = %s',
+      PhabricatorUser::SESSION_TABLE,
+      $session_key);
+    if (!$session) {
+      return array(
+        'ERR-INVALID-SESSION',
+        'Session key is invalid.',
+      );
+    }
+
+    // TODO: Make sessions timeout.
+    // TODO: When we pull a session, read connectionID from the session table.
+
+    $user = id(new PhabricatorUser())->loadOneWhere(
+      'phid = %s',
+      $session['userPHID']);
+    if (!$user) {
+      return array(
+        'ERR-INVALID-SESSION',
+        'Session is for nonexistent user.',
+      );
+    }
+
+    $api_request->setUser($user);
+    return null;
+  }
+
   private function buildHumanReadableResponse(
     $method,
     ConduitAPIRequest $request = null,

src/applications/conduit/method/user/whoami/ConduitAPI_user_whoami_Method.php

@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * Copyright 2011 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class ConduitAPI_user_whoami_Method extends ConduitAPIMethod {
+
+  public function getMethodDescription() {
+    return "Retrieve information about the logged-in user.";
+  }
+
+  public function defineParamTypes() {
+    return array(
+    );
+  }
+
+  public function defineReturnType() {
+    return 'nonempty dict<string, wild>';
+  }
+
+  public function defineErrorTypes() {
+    return array(
+    );
+  }
+
+  protected function execute(ConduitAPIRequest $request) {
+    $user = $request->getUser();
+    return array(
+      'phid'      => $user->getPHID(),
+      'userName'  => $user->getUserName(),
+      'realName'  => $user->getRealName(),
+    );
+  }
+
+}

src/applications/conduit/method/user/whoami/__init__.php

@@ -0,0 +1,12 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phabricator', 'applications/conduit/method/base');
+
+
+phutil_require_source('ConduitAPI_user_whoami_Method.php');

src/applications/conduit/protocol/request/ConduitAPIRequest.php

@@ -19,6 +19,7 @@
 class ConduitAPIRequest {
 
   protected $params;
+  private $user;
 
   public function __construct(array $params) {
     $this->params = $params;
@@ -32,4 +33,29 @@ class ConduitAPIRequest {
     return $this->params;
   }
 
+  public function setUser($user) {
+    $this->user = $user;
+    return $this;
+  }
+
+  /**
+   * Retrieve the authentic identity of the user making the request. If a
+   * method requires authentication (the default) the user object will always
+   * be available. If a method does not require authentication (i.e., overrides
+   * shouldRequireAuthentication() to return false) the user object will NEVER
+   * be available.
+   *
+   * @return PhabricatorUser Authentic user, available ONLY if the method
+   *                         requires authentication.
+   */
+  public function getUser() {
+    if (!$this->user) {
+      throw new Exception(
+        "You can not access the user inside the implementation of a Conduit ".
+        "method which does not require authentication (as per ".
+        "shouldRequireAuthentication()).");
+    }
+    return $this->user;
+  }
+
 }