Move "Welcome" mail generation out of PhabricatorUser

Summary:
Ref PHI1027. Currently, `PhabricatorUser` has a couple of mail-related methods which shouldn't really be there in the long term. Immediately, I want to make some adjusments to the welcome email.

Move "Welcome" mail generation to a separate class and consolidate all the error handling. (Eventually, "invite" and "verify address" email should move to similar subclasses, too.) Previously, a bunch of errors/conditions got checked in multiple places.

The only functional change is that we no longer allow you to send welcome mail to disabled users.

Test Plan:
  - Used "Send Welcome Mail" from profile pages to send mail.
  - Hit "not admin", "disabled user", "bot/mailing list" errors.
  - Used `scripts/user/add_user.php` to send welcome mail.
  - Used "Create New User" to send welcome mail.
  - Verified mail with `bin/mail show-outbound`. (Cleaned up a couple of minor display issues here.)

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D19989

scripts/user/add_user.php

@@ -59,7 +59,12 @@ id(new PhabricatorUserEditor())
   ->setActor($admin)
   ->createNewUser($user, $email_object);
 
-$user->sendWelcomeEmail($admin);
+$welcome_engine = id(new PhabricatorPeopleWelcomeMailEngine())
+  ->setSender($admin)
+  ->setRecipient($user);
+if ($welcome_engine->canSendMail()) {
+  $welcome_engine->sendMail();
+}
 
 echo pht(
   "Created user '%s' (realname='%s', email='%s').\n",

src/__phutil_library_map__.php

@@ -3814,6 +3814,8 @@ phutil_register_library_map(array(
     'PhabricatorPeopleLogQuery' => 'applications/people/query/PhabricatorPeopleLogQuery.php',
     'PhabricatorPeopleLogSearchEngine' => 'applications/people/query/PhabricatorPeopleLogSearchEngine.php',
     'PhabricatorPeopleLogsController' => 'applications/people/controller/PhabricatorPeopleLogsController.php',
+    'PhabricatorPeopleMailEngine' => 'applications/people/mail/PhabricatorPeopleMailEngine.php',
+    'PhabricatorPeopleMailEngineException' => 'applications/people/mail/PhabricatorPeopleMailEngineException.php',
     'PhabricatorPeopleManageProfileMenuItem' => 'applications/people/menuitem/PhabricatorPeopleManageProfileMenuItem.php',
     'PhabricatorPeopleManagementWorkflow' => 'applications/people/management/PhabricatorPeopleManagementWorkflow.php',
     'PhabricatorPeopleNewController' => 'applications/people/controller/PhabricatorPeopleNewController.php',
@@ -3841,6 +3843,7 @@ phutil_register_library_map(array(
     'PhabricatorPeopleUserFunctionDatasource' => 'applications/people/typeahead/PhabricatorPeopleUserFunctionDatasource.php',
     'PhabricatorPeopleUserPHIDType' => 'applications/people/phid/PhabricatorPeopleUserPHIDType.php',
     'PhabricatorPeopleWelcomeController' => 'applications/people/controller/PhabricatorPeopleWelcomeController.php',
+    'PhabricatorPeopleWelcomeMailEngine' => 'applications/people/mail/PhabricatorPeopleWelcomeMailEngine.php',
     'PhabricatorPhabricatorAuthProvider' => 'applications/auth/provider/PhabricatorPhabricatorAuthProvider.php',
     'PhabricatorPhameApplication' => 'applications/phame/application/PhabricatorPhameApplication.php',
     'PhabricatorPhameBlogPHIDType' => 'applications/phame/phid/PhabricatorPhameBlogPHIDType.php',
@@ -9730,6 +9733,8 @@ phutil_register_library_map(array(
     'PhabricatorPeopleLogQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'PhabricatorPeopleLogSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'PhabricatorPeopleLogsController' => 'PhabricatorPeopleController',
+    'PhabricatorPeopleMailEngine' => 'Phobject',
+    'PhabricatorPeopleMailEngineException' => 'Exception',
     'PhabricatorPeopleManageProfileMenuItem' => 'PhabricatorProfileMenuItem',
     'PhabricatorPeopleManagementWorkflow' => 'PhabricatorManagementWorkflow',
     'PhabricatorPeopleNewController' => 'PhabricatorPeopleController',
@@ -9757,6 +9762,7 @@ phutil_register_library_map(array(
     'PhabricatorPeopleUserFunctionDatasource' => 'PhabricatorTypeaheadCompositeDatasource',
     'PhabricatorPeopleUserPHIDType' => 'PhabricatorPHIDType',
     'PhabricatorPeopleWelcomeController' => 'PhabricatorPeopleController',
+    'PhabricatorPeopleWelcomeMailEngine' => 'PhabricatorPeopleMailEngine',
     'PhabricatorPhabricatorAuthProvider' => 'PhabricatorOAuth2AuthProvider',
     'PhabricatorPhameApplication' => 'PhabricatorApplication',
     'PhabricatorPhameBlogPHIDType' => 'PhabricatorPHIDType',

src/applications/metamta/management/PhabricatorMailManagementShowOutboundWorkflow.php

@@ -115,7 +115,14 @@ final class PhabricatorMailManagementShowOutboundWorkflow
       $info[] = $this->newSectionHeader(pht('HEADERS'));
 
       $headers = $message->getDeliveredHeaders();
+      if (!$headers) {
+        $headers = array();
+      }
+
       $unfiltered = $message->getUnfilteredHeaders();
+      if (!$unfiltered) {
+        $unfiltered = array();
+      }
 
       $header_map = array();
       foreach ($headers as $header) {
@@ -201,6 +208,7 @@ final class PhabricatorMailManagementShowOutboundWorkflow
         $info[] = null;
       } else {
         $info[] = pht('(This message has no HTML body.)');
+        $info[] = null;
       }
 
       $console->writeOut('%s', implode("\n", $info));

src/applications/people/controller/PhabricatorPeopleNewController.php

@@ -107,8 +107,13 @@ final class PhabricatorPeopleNewController
               ->makeMailingListUser($user, true);
           }
 
-          if ($welcome_checked && !$is_bot && !$is_list) {
-            $user->sendWelcomeEmail($admin);
+          if ($welcome_checked) {
+            $welcome_engine = id(new PhabricatorPeopleWelcomeMailEngine())
+              ->setSender($admin)
+              ->setRecipient($user);
+            if ($welcome_engine->canSendMail()) {
+              $welcome_engine->sendMail();
+            }
           }
 
           $response = id(new AphrontRedirectResponse())

src/applications/people/controller/PhabricatorPeopleProfileManageController.php

@@ -92,8 +92,11 @@ final class PhabricatorPeopleProfileManageController
       PeopleDisableUsersCapability::CAPABILITY);
     $can_disable = ($has_disable && !$is_self);
 
-    $can_welcome = ($is_admin && $user->canEstablishWebSessions());
+    $welcome_engine = id(new PhabricatorPeopleWelcomeMailEngine())
+      ->setSender($viewer)
+      ->setRecipient($user);
 
+    $can_welcome = $welcome_engine->canSendMail();
     $curtain = $this->newCurtainView($user);
 
     $curtain->addAction(

src/applications/people/controller/PhabricatorPeopleWelcomeController.php

@@ -3,6 +3,13 @@
 final class PhabricatorPeopleWelcomeController
   extends PhabricatorPeopleController {
 
+  public function shouldRequireAdmin() {
+    // You need to be an administrator to actually send welcome email, but
+    // we let anyone hit this page so they can get a nice error dialog
+    // explaining the issue.
+    return false;
+  }
+
   public function handleRequest(AphrontRequest $request) {
     $admin = $this->getViewer();
 
@@ -14,22 +21,24 @@ final class PhabricatorPeopleWelcomeController
       return new Aphront404Response();
     }
 
-    $profile_uri = '/p/'.$user->getUsername().'/';
+    $id = $user->getID();
+    $profile_uri = "/people/manage/{$id}/";
 
-    if (!$user->canEstablishWebSessions()) {
+    $welcome_engine = id(new PhabricatorPeopleWelcomeMailEngine())
+      ->setSender($admin)
+      ->setRecipient($user);
+
+    try {
+      $welcome_engine->validateMail();
+    } catch (PhabricatorPeopleMailEngineException $ex) {
       return $this->newDialog()
-        ->setTitle(pht('Not a Normal User'))
-        ->appendParagraph(
-          pht(
-            'You can not send this user a welcome mail because they are not '.
-            'a normal user and can not log in to the web interface. Special '.
-            'users (like bots and mailing lists) are unable to establish web '.
-            'sessions.'))
+        ->setTitle($ex->getTitle())
+        ->appendParagraph($ex->getBody())
         ->addCancelButton($profile_uri, pht('Done'));
     }
 
     if ($request->isFormPost()) {
-      $user->sendWelcomeEmail($admin);
+      $welcome_engine->sendMail();
       return id(new AphrontRedirectResponse())->setURI($profile_uri);
     }
 

src/applications/people/mail/PhabricatorPeopleMailEngine.php

@@ -0,0 +1,61 @@
+<?php
+
+abstract class PhabricatorPeopleMailEngine
+  extends Phobject {
+
+  private $sender;
+  private $recipient;
+
+  final public function setSender(PhabricatorUser $sender) {
+    $this->sender = $sender;
+    return $this;
+  }
+
+  final public function getSender() {
+    if (!$this->sender) {
+      throw new PhutilInvalidStateException('setSender');
+    }
+    return $this->sender;
+  }
+
+  final public function setRecipient(PhabricatorUser $recipient) {
+    $this->recipient = $recipient;
+    return $this;
+  }
+
+  final public function getRecipient() {
+    if (!$this->recipient) {
+      throw new PhutilInvalidStateException('setRecipient');
+    }
+    return $this->recipient;
+  }
+
+  final public function canSendMail() {
+    try {
+      $this->validateMail();
+      return true;
+    } catch (PhabricatorPeopleMailEngineException $ex) {
+      return false;
+    }
+  }
+
+  final public function sendMail() {
+    $this->validateMail();
+    $mail = $this->newMail();
+
+    $mail
+      ->setForceDelivery(true)
+      ->save();
+
+    return $mail;
+  }
+
+  abstract public function validateMail();
+  abstract protected function newMail();
+
+
+  final protected function throwValidationException($title, $body) {
+    throw new PhabricatorPeopleMailEngineException($title, $body);
+  }
+
+}

src/applications/people/mail/PhabricatorPeopleMailEngineException.php

@@ -0,0 +1,24 @@
+<?php
+
+final class PhabricatorPeopleMailEngineException
+  extends Exception {
+
+  private $title;
+  private $body;
+
+  public function __construct($title, $body) {
+    $this->title = $title;
+    $this->body = $body;
+
+    parent::__construct(pht('%s: %s', $title, $body));
+  }
+
+  public function getTitle() {
+    return $this->title;
+  }
+
+  public function getBody() {
+    return $this->body;
+  }
+
+}

src/applications/people/mail/PhabricatorPeopleWelcomeMailEngine.php

@@ -0,0 +1,83 @@
+<?php
+
+final class PhabricatorPeopleWelcomeMailEngine
+  extends PhabricatorPeopleMailEngine {
+
+  public function validateMail() {
+    $sender = $this->getSender();
+    $recipient = $this->getRecipient();
+
+    if (!$sender->getIsAdmin()) {
+      $this->throwValidationException(
+        pht('Not an Administrator'),
+        pht(
+          'You can not send welcome mail because you are not an '.
+          'administrator. Only administrators may send welcome mail.'));
+    }
+
+    if ($recipient->getIsDisabled()) {
+      $this->throwValidationException(
+        pht('User is Disabled'),
+        pht(
+          'You can not send welcome mail to this user because their account '.
+          'is disabled.'));
+    }
+
+    if (!$recipient->canEstablishWebSessions()) {
+      $this->throwValidationException(
+        pht('Not a Normal User'),
+        pht(
+          'You can not send this user welcome mail because they are not '.
+          'a normal user and can not log in to the web interface. Special '.
+          'users (like bots and mailing lists) are unable to establish '.
+          'web sessions.'));
+    }
+  }
+
+  protected function newMail() {
+    $sender = $this->getSender();
+    $recipient = $this->getRecipient();
+
+    $sender_username = $sender->getUserName();
+    $sender_realname = $sender->getRealName();
+
+    $recipient_username = $recipient->getUserName();
+    $is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');
+
+    $base_uri = PhabricatorEnv::getProductionURI('/');
+
+    $engine = new PhabricatorAuthSessionEngine();
+
+    $uri = $engine->getOneTimeLoginURI(
+      $recipient,
+      $recipient->loadPrimaryEmail(),
+      PhabricatorAuthSessionEngine::ONETIME_WELCOME);
+
+    $body = pht(
+      "Welcome to Phabricator!\n\n".
+      "%s (%s) has created an account for you.\n\n".
+      "  Username: %s\n\n".
+      "To login to Phabricator, follow this link and set a password:\n\n".
+      "  %s\n\n".
+      "After you have set a password, you can login in the future by ".
+      "going here:\n\n".
+      "  %s\n",
+      $sender_username,
+      $sender_realname,
+      $recipient_username,
+      $uri,
+      $base_uri);
+
+    if (!$is_serious) {
+      $body .= sprintf(
+        "\n%s\n",
+        pht("Love,\nPhabricator"));
+    }
+
+    return id(new PhabricatorMetaMTAMail())
+      ->addTos(array($recipient->getPHID()))
+      ->setSubject(pht('[Phabricator] Welcome to Phabricator'))
+      ->setBody($body);
+  }
+
+}

src/applications/people/storage/PhabricatorUser.php

@@ -555,56 +555,6 @@ final class PhabricatorUser
     }
   }
 
-  public function sendWelcomeEmail(PhabricatorUser $admin) {
-    if (!$this->canEstablishWebSessions()) {
-      throw new Exception(
-        pht(
-          'Can not send welcome mail to users who can not establish '.
-          'web sessions!'));
-    }
-
-    $admin_username = $admin->getUserName();
-    $admin_realname = $admin->getRealName();
-    $user_username = $this->getUserName();
-    $is_serious = PhabricatorEnv::getEnvConfig('phabricator.serious-business');
-
-    $base_uri = PhabricatorEnv::getProductionURI('/');
-
-    $engine = new PhabricatorAuthSessionEngine();
-    $uri = $engine->getOneTimeLoginURI(
-      $this,
-      $this->loadPrimaryEmail(),
-      PhabricatorAuthSessionEngine::ONETIME_WELCOME);
-
-    $body = pht(
-      "Welcome to Phabricator!\n\n".
-      "%s (%s) has created an account for you.\n\n".
-      "  Username: %s\n\n".
-      "To login to Phabricator, follow this link and set a password:\n\n".
-      "  %s\n\n".
-      "After you have set a password, you can login in the future by ".
-      "going here:\n\n".
-      "  %s\n",
-      $admin_username,
-      $admin_realname,
-      $user_username,
-      $uri,
-      $base_uri);
-
-    if (!$is_serious) {
-      $body .= sprintf(
-        "\n%s\n",
-        pht("Love,\nPhabricator"));
-    }
-
-    $mail = id(new PhabricatorMetaMTAMail())
-      ->addTos(array($this->getPHID()))
-      ->setForceDelivery(true)
-      ->setSubject(pht('[Phabricator] Welcome to Phabricator'))
-      ->setBody($body)
-      ->saveAndSend();
-  }
-
   public function sendUsernameChangeEmail(
     PhabricatorUser $admin,
     $old_username) {