Allow administrators to change usernames

Summary:
Give them a big essay about how it's dangerous, but allow them to do it formally.

Because the username is part of the password salt, users must change their passwords after a username change.

Make password reset links work for already-logged-in-users since there's no reason not to (if you have a reset link, you can log out and use it) and it's much less confusing if you get this email and are already logged in.

Depends on: D2651

Test Plan: Changed a user's username to all kinds of crazy things. Clicked reset links in email. Tried to make invalid/nonsense name changes.

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran

Maniphest Tasks: T1303

Differential Revision: https://secure.phabricator.com/D2657

src/applications/auth/controller/PhabricatorEmailTokenController.php

@@ -36,22 +36,6 @@ final class PhabricatorEmailTokenController
       return new Aphront400Response();
     }
 
-    if ($request->getUser()->getPHID()) {
-      $view = new AphrontRequestFailureView();
-      $view->setHeader('Already Logged In');
-      $view->appendChild(
-        '<p>You are already logged in.</p>');
-      $view->appendChild(
-        '<div class="aphront-failure-continue">'.
-          '<a class="button" href="/">Return Home</a>'.
-        '</div>');
-      return $this->buildStandardPageResponse(
-        $view,
-        array(
-          'title' => 'Already Logged In',
-        ));
-    }
-
     $token = $this->token;
     $email = $request->getStr('email');
 
@@ -103,10 +87,12 @@ final class PhabricatorEmailTokenController
     // enough, without requiring users to go through a second round of email
     // verification.
 
+    $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
       $target_email->setIsVerified(1);
       $target_email->save();
-
       $session_key = $target_user->establishSession('web');
+    unset($unguarded);
+
     $request->setCookie('phusr', $target_user->getUsername());
     $request->setCookie('phsid', $session_key);
 

src/applications/people/PhabricatorUserEditor.php

@@ -148,6 +148,49 @@ final class PhabricatorUserEditor {
   }
 
 
+  /**
+   * @task edit
+   */
+  public function changeUsername(PhabricatorUser $user, $username) {
+    $actor = $this->requireActor();
+
+    if (!$user->getID()) {
+      throw new Exception("User has not been created yet!");
+    }
+
+    if (!PhabricatorUser::validateUsername($username)) {
+      $valid = PhabricatorUser::describeValidUsername();
+      throw new Exception("Username is invalid! {$valid}");
+    }
+
+    $old_username = $user->getUsername();
+
+    $user->openTransaction();
+      $user->reload();
+      $user->setUsername($username);
+
+      try {
+        $user->save();
+      } catch (AphrontQueryDuplicateKeyException $ex) {
+        $user->setUsername($old_username);
+        $user->killTransaction();
+        throw $ex;
+      }
+
+      $log = PhabricatorUserLog::newLog(
+        $this->actor,
+        $user,
+        PhabricatorUserLog::ACTION_CHANGE_USERNAME);
+      $log->setOldValue($old_username);
+      $log->setNewValue($username);
+      $log->save();
+
+    $user->saveTransaction();
+
+    $user->sendUsernameChangeEmail($actor, $old_username);
+  }
+
+
 /* -(  Editing Roles  )------------------------------------------------------ */
 
 

src/applications/people/controller/PhabricatorPeopleEditController.php

@@ -41,23 +41,24 @@ final class PhabricatorPeopleEditController
       if (!$user) {
         return new Aphront404Response();
       }
+      $base_uri = '/people/edit/'.$user->getID().'/';
     } else {
       $user = new PhabricatorUser();
+      $base_uri = '/people/edit/';
     }
 
-    $views = array(
-      'basic'     => 'Basic Information',
-      'role'      => 'Edit Roles',
-      'cert'      => 'Conduit Certificate',
-    );
+    $nav = new AphrontSideNavFilterView();
+    $nav->setBaseURI(new PhutilURI($base_uri));
+    $nav->addFilter('basic', 'Basic Information');
+    $nav->addFilter('role',  'Edit Roles');
+    $nav->addFilter('cert',  'Conduit Certificate');
+    $nav->addSpacer();
+    $nav->addFilter('rename', 'Change Username');
 
     if (!$user->getID()) {
-      $view = 'basic';
-    } else if (isset($views[$this->view])) {
-      $view = $this->view;
-    } else {
-      $view = 'basic';
+      $this->view = 'basic';
     }
+    $view = $nav->selectFilter($this->view, 'basic');
 
     $content = array();
 
@@ -79,6 +80,11 @@ final class PhabricatorPeopleEditController
       case 'cert':
         $response = $this->processCertificateRequest($user);
         break;
+      case 'rename':
+        $response = $this->processRenameRequest($user);
+        break;
+      default:
+        return new Aphront404Response();
     }
 
     if ($response instanceof AphrontResponse) {
@@ -88,21 +94,8 @@ final class PhabricatorPeopleEditController
     $content[] = $response;
 
     if ($user->getID()) {
-      $side_nav = new AphrontSideNavView();
-      $side_nav->appendChild($content);
-      foreach ($views as $key => $name) {
-        $side_nav->addNavItem(
-          phutil_render_tag(
-            'a',
-            array(
-              'href' => '/people/edit/'.$user->getID().'/'.$key.'/',
-              'class' => ($key == $view)
-                ? 'aphront-side-nav-selected'
-                : null,
-            ),
-            phutil_escape_html($name)));
-      }
-      $content = $side_nav;
+      $nav->appendChild($content);
+      $content = $nav;
     }
 
     return $this->buildStandardPageResponse(
@@ -444,7 +437,6 @@ final class PhabricatorPeopleEditController
     $request = $this->getRequest();
     $admin = $request->getUser();
 
-
     $form = new AphrontFormView();
     $form
       ->setUser($admin)
@@ -481,6 +473,100 @@ final class PhabricatorPeopleEditController
     return array($panel);
   }
 
+  private function processRenameRequest(PhabricatorUser $user) {
+    $request = $this->getRequest();
+    $admin = $request->getUser();
+
+    $e_username = true;
+    $username = $user->getUsername();
+
+    $errors = array();
+    if ($request->isFormPost()) {
+
+      $username = $request->getStr('username');
+      if (!strlen($username)) {
+        $e_username = 'Required';
+        $errors[] = 'New username is required.';
+      } else if ($username == $user->getUsername()) {
+        $e_username = 'Invalid';
+        $errors[] = 'New username must be different from old username.';
+      } else if (!PhabricatorUser::validateUsername($username)) {
+        $e_username = 'Invalid';
+        $errors[] = PhabricatorUser::describeValidUsername();
+      }
+
+      if (!$errors) {
+        try {
+
+          id(new PhabricatorUserEditor())
+            ->setActor($admin)
+            ->changeUsername($user, $username);
+
+          return id(new AphrontRedirectResponse())
+            ->setURI($request->getRequestURI()->alter('saved', true));
+        } catch (AphrontQueryDuplicateKeyException $ex) {
+          $e_username = 'Not Unique';
+          $errors[] = 'Another user already has that username.';
+        }
+      }
+    }
+
+    if ($errors) {
+      $errors = id(new AphrontErrorView())
+        ->setTitle('Form Errors')
+        ->setErrors($errors);
+    } else {
+      $errors = null;
+    }
+
+    $form = new AphrontFormView();
+    $form
+      ->setUser($admin)
+      ->setAction($request->getRequestURI())
+      ->appendChild(
+        '<p class="aphront-form-instructions">'.
+          '<strong>Be careful when renaming users!</strong> '.
+          'The old username will no longer be tied to the user, so anything '.
+          'which uses it (like old commit messages) will no longer associate '.
+          'correctly. And if you give a user a username which some other user '.
+          'used to have, username lookups will begin returning the wrong '.
+          'user.'.
+        '</p>'.
+        '<p class="aphront-form-instructions">'.
+          'It is generally safe to rename newly created users (and test users '.
+          'and so on), but less safe to rename established users and unsafe '.
+          'to reissue a username.'.
+        '</p>'.
+        '<p class="aphront-form-instructions">'.
+          'Users who rely on password auth will need to reset their password '.
+          'after their username is changed (their username is part of the '.
+          'salt in the password hash). They will receive an email with '.
+          'instructions on how to do this.'.
+        '</p>')
+      ->appendChild(
+        id(new AphrontFormStaticControl())
+          ->setLabel('Old Username')
+          ->setValue($user->getUsername()))
+      ->appendChild(
+        id(new AphrontFormTextControl())
+          ->setLabel('New Username')
+          ->setValue($username)
+          ->setName('username')
+          ->setError($e_username))
+      ->appendChild(
+        id(new AphrontFormSubmitControl())
+          ->setValue('Change Username'));
+
+    $panel = new AphrontPanelView();
+    $panel->setHeader('Change Username');
+    $panel->setWidth(AphrontPanelView::WIDTH_FORM);
+    $panel->appendChild($form);
+
+    return array($errors, $panel);
+  }
+
+
+
   private function getRoleInstructions() {
     $roles_link = phutil_render_tag(
       'a',

src/applications/people/storage/PhabricatorUser.php

@@ -549,6 +549,46 @@ EOBODY;
       ->saveAndSend();
   }
 
+  public function sendUsernameChangeEmail(
+    PhabricatorUser $admin,
+    $old_username) {
+
+    $admin_username = $admin->getUserName();
+    $admin_realname = $admin->getRealName();
+    $new_username = $this->getUserName();
+
+    $password_instructions = null;
+    if (PhabricatorEnv::getEnvConfig('auth.password-auth-enabled')) {
+      $uri = $this->getEmailLoginURI();
+      $password_instructions = <<<EOTXT
+If you use a password to login, you'll need to reset it before you can login
+again. You can reset your password by following this link:
+
+  {$uri}
+
+And, of course, you'll need to use your new username to login from now on. If
+you use OAuth to login, nothing should change.
+
+EOTXT;
+    }
+
+    $body = <<<EOBODY
+{$admin_username} ({$admin_realname}) has changed your Phabricator username.
+
+  Old Username: {$old_username}
+  New Username: {$new_username}
+
+{$password_instructions}
+EOBODY;
+
+    $mail = id(new PhabricatorMetaMTAMail())
+      ->addTos(array($this->getPHID()))
+      ->setSubject('[Phabricator] Username Changed')
+      ->setBody($body)
+      ->setFrom($admin->getPHID())
+      ->saveAndSend();
+  }
+
   public static function describeValidUsername() {
     return 'Usernames must contain only numbers, letters, period, underscore '.
            'and hyphen, and can not end with a period.';

src/applications/people/storage/PhabricatorUserLog.php

@@ -37,6 +37,7 @@ final class PhabricatorUserLog extends PhabricatorUserDAO {
   const ACTION_EMAIL_ADD        = 'email-add';
 
   const ACTION_CHANGE_PASSWORD  = 'change-password';
+  const ACTION_CHANGE_USERNAME  = 'change-username';
 
   protected $actorPHID;
   protected $userPHID;