Merge pull request #8215 from nupplaphil/task/extract_email

Cleanup enotify & Extract System emails

boot.php

@@ -152,8 +152,6 @@ define('NOTIFY_TAGSHARE',   256);
 define('NOTIFY_POKE',       512);
 define('NOTIFY_SHARE',     1024);
 
-define('SYSTEM_EMAIL',    16384);
-
 define('NOTIFY_SYSTEM',   32768);
 /* @}*/
 

include/enotify.php

@@ -72,20 +72,15 @@ function notification($params)
 		$hostname = substr($hostname, 0, strpos($hostname, ':'));
 	}
 
-	$sender_email = $a->getSenderEmailAddress();
+	$sender_email = DI::emailer()->getSiteEmailAddress();
 
-	if ($params['type'] != SYSTEM_EMAIL) {
+	$user = User::getById($params['uid'], ['nickname', 'page-flags']);
-		$user = DBA::selectFirst('user', ['nickname', 'page-flags'],
-			['uid' => $params['uid']]);
 
 	// There is no need to create notifications for forum accounts
 	if (!DBA::isResult($user) || in_array($user["page-flags"], [User::PAGE_FLAGS_COMMUNITY, User::PAGE_FLAGS_PRVGROUP])) {
 		return false;
 	}
 	$nickname = $user["nickname"];
-	} else {
-		$nickname = '';
-	}
 
 	// with $params['show_in_notification_page'] == false, the notification isn't inserted into
 	// the database, and an email is sent if applicable.
@@ -428,30 +423,6 @@ function notification($params)
 		}
 	}
 
-	if ($params['type'] == SYSTEM_EMAIL) {
-		// not part of the notifications.
-		// it just send a mail to the user.
-		// It will be used by the system to send emails to users (like
-		// password reset, invitations and so) using one look (but without
-		// add a notification to the user, with could be inexistent)
-		if (!isset($params['subject'])) {
-			Logger::warning('subject isn\'t set.', ['type' => $params['type']]);
-		}
-		$subject = $params['subject'] ?? '';
-
-		if (!isset($params['preamble'])) {
-			Logger::warning('preamble isn\'t set.', ['type' => $params['type'], 'subject' => $subject]);
-		}
-		$preamble = $params['preamble'] ?? '';
-
-		if (!isset($params['body'])) {
-			Logger::warning('body isn\'t set.', ['type' => $params['type'], 'subject' => $subject, 'preamble' => $preamble]);
-		}
-		$body = $params['body'] ?? '';
-
-		$show_in_notification_page = false;
-	}
-
 	$subject .= " (".$nickname."@".$hostname.")";
 
 	$h = [
@@ -506,8 +477,7 @@ function notification($params)
 
 	// send email notification if notification preferences permit
 	if ((intval($params['notify_flags']) & intval($params['type']))
-		|| $params['type'] == NOTIFY_SYSTEM
+		|| $params['type'] == NOTIFY_SYSTEM) {
-		|| $params['type'] == SYSTEM_EMAIL) {
 
 		Logger::log('sending notification email');
 
@@ -548,7 +518,6 @@ function notification($params)
 		$datarray['source_link']  = $params['source_link'] ?? '';
 		$datarray['source_photo'] = $params['source_photo'] ?? '';
 		$datarray['uid']          = $params['uid'];
-		$datarray['username']     = $params['to_name'] ?? '';
 		$datarray['hsitelink']    = $hsitelink;
 		$datarray['tsitelink']    = $tsitelink;
 		$datarray['hitemlink']    = '<a href="' . $itemlink . '">' . $itemlink . '</a>';
@@ -564,11 +533,10 @@ function notification($params)
 		Hook::callAll('enotify_mail', $datarray);
 
 		// check whether sending post content in email notifications is allowed
-		// always true for SYSTEM_EMAIL
+		$content_allowed = (!DI::config()->get('system', 'enotify_no_content'));
-		$content_allowed = ((!DI::config()->get('system', 'enotify_no_content')) || ($params['type'] == SYSTEM_EMAIL));
 
 		// load the template for private message notifications
-		$tpl             = Renderer::getMarkupTemplate('email_notify_html.tpl');
+		$tpl             = Renderer::getMarkupTemplate('email/notify/html.tpl');
 		$email_html_body = Renderer::replaceMacros($tpl, [
 			'$banner'          => $datarray['banner'],
 			'$product'         => $datarray['product'],
@@ -578,7 +546,6 @@ function notification($params)
 			'$source_name'     => $datarray['source_name'],
 			'$source_link'     => $datarray['source_link'],
 			'$source_photo'    => $datarray['source_photo'],
-			'$username'        => $datarray['username'],
 			'$hsitelink'       => $datarray['hsitelink'],
 			'$hitemlink'       => $datarray['hitemlink'],
 			'$thanks'          => $datarray['thanks'],
@@ -589,17 +556,9 @@ function notification($params)
 		]);
 
 		// load the template for private message notifications
-		$tpl             = Renderer::getMarkupTemplate('email_notify_text.tpl');
+		$tpl             = Renderer::getMarkupTemplate('email/notify/text.tpl');
 		$email_text_body = Renderer::replaceMacros($tpl, [
-			'$banner'          => $datarray['banner'],
-			'$product'         => $datarray['product'],
 			'$preamble'        => $datarray['preamble'],
-			'$sitename'        => $datarray['sitename'],
-			'$siteurl'         => $datarray['siteurl'],
-			'$source_name'     => $datarray['source_name'],
-			'$source_link'     => $datarray['source_link'],
-			'$source_photo'    => $datarray['source_photo'],
-			'$username'        => $datarray['username'],
 			'$tsitelink'       => $datarray['tsitelink'],
 			'$titemlink'       => $datarray['titemlink'],
 			'$thanks'          => $datarray['thanks'],

mod/lostpass.php

@@ -64,17 +64,14 @@ function lostpass_post(App $a)
 		Site Location:	%2$s
 		Login Name:	%3$s', $resetlink, DI::baseUrl(), $user['nickname']));
 
-	notification([
+	$email = DI::emailer()
-		'type'     => SYSTEM_EMAIL,
+		->newSystemMail()
-		'language' => $user['language'],
+		->withMessage(DI::l10n()->t('Password reset requested at %s', $sitename), $preamble, $body)
-		'to_name'  => $user['username'],
+		->forUser($user)
-		'to_email' => $user['email'],
+		->withRecipient($user['email'])
-		'uid'      => $user['uid'],
+		->build();
-		'subject'  => DI::l10n()->t('Password reset requested at %s', $sitename),
-		'preamble' => $preamble,
-		'body'     => $body
-	]);
 
+	DI::emailer()->send($email);
 	DI::baseUrl()->redirect();
 }
 
@@ -159,16 +156,13 @@ function lostpass_generate_password($user)
 			You may change that password from your account settings page after logging in.
 		', DI::baseUrl(), $user['nickname'], $new_password));
 
-		notification([
+		$email = DI::emailer()
-			'type'     => SYSTEM_EMAIL,
+			->newSystemMail()
-			'language' => $user['language'],
+			->withMessage(DI::l10n()->t('Your password has been changed at %s', $sitename), $preamble, $body)
-			'to_name'  => $user['username'],
+			->forUser($user)
-			'to_email' => $user['email'],
+			->withRecipient($user['email'])
-			'uid'      => $user['uid'],
+			->build();
-			'subject'  => DI::l10n()->t('Your password has been changed at %s', $sitename),
+		DI::emailer()->send($email);
-			'preamble' => $preamble,
-			'body'     => $body
-		]);
 	}
 
 	return $o;

mod/removeme.php

@@ -40,17 +40,17 @@ function removeme_post(App $a)
 		if (!DBA::isResult($admin)) {
 			continue;
 		}
-		notification([
+
-			'type'         => SYSTEM_EMAIL,
+		$email = DI::emailer()
-			'subject'      => DI::l10n()->t('[Friendica System Notify]') . ' ' . DI::l10n()->t('User deleted their account'),
+			->newSystemMail()
-			'preamble'     => DI::l10n()->t('On your Friendica node an user deleted their account. Please ensure that their data is removed from the backups.'),
+			->withMessage(
-			'body'         => DI::l10n()->t('The user id is %d', local_user()),
+				DI::l10n()->t('[Friendica System Notify]') . ' ' . DI::l10n()->t('User deleted their account'),
-			'to_email'     => $admin['email'],
+				DI::l10n()->t('On your Friendica node an user deleted their account. Please ensure that their data is removed from the backups.'),
-			'to_name'      => $admin['username'],
+				DI::l10n()->t('The user id is %d', local_user()))
-			'uid'          => $admin['uid'],
+			->forUser($admin)
-			'language'     => $admin['language'] ? $admin['language'] : 'en',
+			->withRecipient($admin['email'])
-			'show_in_notification_page' => false
+			->build();
-		]);
+		DI::emailer()->send($email);
 	}
 
 	if (User::getIdFromPasswordAuthentication($a->user, trim($_POST['qxz_password']))) {

src/App.php

@@ -242,27 +242,6 @@ class App
 			$this->baseURL->get();
 	}
 
-	/**
-	 * Generates the site's default sender email address
-	 *
-	 * @return string
-	 * @throws HTTPException\InternalServerErrorException
-	 */
-	public function getSenderEmailAddress()
-	{
-		$sender_email = $this->config->get('config', 'sender_email');
-		if (empty($sender_email)) {
-			$hostname = $this->baseURL->getHostname();
-			if (strpos($hostname, ':')) {
-				$hostname = substr($hostname, 0, strpos($hostname, ':'));
-			}
-
-			$sender_email = 'noreply@' . $hostname;
-		}
-
-		return $sender_email;
-	}
-
 	/**
 	 * Returns the current theme name. May be overriden by the mobile theme name.
 	 *

src/Core/Update.php

@@ -252,7 +252,7 @@ class Update
 			}
 			$sent[] = $admin['email'];
 
-			$lang = (($admin['language'])?$admin['language']:'en');
+			$lang = $admin['language'] ?? 'en';
 			$l10n = DI::l10n()->withLang($lang);
 
 			$preamble = Strings::deindent($l10n->t("
@@ -263,15 +263,13 @@ class Update
 				$update_id));
 			$body     = $l10n->t("The error message is\n[pre]%s[/pre]", $error_message);
 
-			notification([
+			$email = DI::emailer()
-					'uid'      => $admin['uid'],
+				->newSystemMail()
-					'type'     => SYSTEM_EMAIL,
+				->withMessage($l10n->t('[Friendica Notify] Database update'), $preamble, $body)
-					'to_email' => $admin['email'],
+				->forUser($admin)
-					'subject'  => $l10n->t('[Friendica Notify] Database update'),
+				->withRecipient($admin['email'])
-					'preamble' => $preamble,
+				->build();
-					'body'     => $body,
+			DI::emailer()->send($email);
-					'language' => $lang]
-			);
 		}
 
 		//try the logger
@@ -301,15 +299,13 @@ class Update
 					The friendica database was successfully updated from %s to %s.",
 					$from_build, $to_build));
 
-				notification([
+				$email = DI::emailer()
-						'uid' => $admin['uid'],
+					->newSystemMail()
-						'type' => SYSTEM_EMAIL,
+					->withMessage($l10n->t('[Friendica Notify] Database update'), $preamble)
-						'to_email' => $admin['email'],
+					->forUser($admin)
-						'subject'  => DI::l10n()->t('[Friendica Notify] Database update'),
+					->withRecipient($admin['email'])
-						'preamble' => $preamble,
+					->build();
-						'body' => $preamble,
+				DI::emailer()->send($email);
-						'language' => $lang]
-				);
 			}
 		}
 

src/Model/User.php

@@ -897,13 +897,13 @@ class User
 			$password
 		));
 
-		return notification([
+		$email = DI::emailer()
-			'type'     => SYSTEM_EMAIL,
+			->newSystemMail()
-			'uid'      => $user['uid'],
+			->withMessage(DI::l10n()->t('Registration at %s', $sitename), $body)
-			'to_email' => $user['email'],
+			->forUser($user)
-			'subject'  => DI::l10n()->t('Registration at %s', $sitename),
+			->withRecipient($user['email'])
-			'body'     => $body
+			->build();
-		]);
+		return DI::emailer()->send($email);
 	}
 
 	/**
@@ -965,15 +965,13 @@ class User
 			$password
 		));
 
-		return notification([
+		$email = DI::emailer()
-			'uid'      => $user['uid'],
+			->newSystemMail()
-			'language' => $user['language'],
+			->withMessage(DI::l10n()->t('Registration details for %s', $sitename), $preamble, $body)
-			'type'     => SYSTEM_EMAIL,
+			->forUser($user)
-			'to_email' => $user['email'],
+			->withRecipient($user['email'])
-			'subject'  => DI::l10n()->t('Registration details for %s', $sitename),
+			->build();
-			'preamble' => $preamble,
+		return DI::emailer()->send($email);
-			'body'     => $body
-		]);
 	}
 
 	/**

src/Module/Admin/Site.php

@@ -13,6 +13,7 @@ use Friendica\Module\BaseAdmin;
 use Friendica\Module\Register;
 use Friendica\Protocol\PortableContact;
 use Friendica\Util\BasePath;
+use Friendica\Util\EMailer\MailBuilder;
 use Friendica\Util\Strings;
 use Friendica\Worker\Delivery;
 
@@ -110,6 +111,7 @@ class Site extends BaseAdmin
 		$sitename         = (!empty($_POST['sitename'])         ? Strings::escapeTags(trim($_POST['sitename']))      : '');
 		$sender_email     = (!empty($_POST['sender_email'])     ? Strings::escapeTags(trim($_POST['sender_email']))  : '');
 		$banner           = (!empty($_POST['banner'])           ? trim($_POST['banner'])                             : false);
+		$email_banner     = (!empty($_POST['email_banner'])     ? trim($_POST['email_banner'])                       : false);
 		$shortcut_icon    = (!empty($_POST['shortcut_icon'])    ? Strings::escapeTags(trim($_POST['shortcut_icon'])) : '');
 		$touch_icon       = (!empty($_POST['touch_icon'])       ? Strings::escapeTags(trim($_POST['touch_icon']))    : '');
 		$additional_info  = (!empty($_POST['additional_info'])  ? trim($_POST['additional_info'])                    : '');
@@ -301,6 +303,12 @@ class Site extends BaseAdmin
 			DI::config()->set('system', 'banner', $banner);
 		}
 
+		if (empty($email_banner)) {
+			DI::config()->delete('system', 'email_banner');
+		} else {
+			DI::config()->set('system', 'email_banner', $email_banner);
+		}
+
 		if (empty($additional_info)) {
 			DI::config()->delete('config', 'info');
 		} else {
@@ -489,6 +497,12 @@ class Site extends BaseAdmin
 			$banner = '<a href="https://friendi.ca"><img id="logo-img" src="images/friendica-32.png" alt="logo" /></a><span id="logo-text"><a href="https://friendi.ca">Friendica</a></span>';
 		}
 
+		$email_banner = DI::config()->get('system', 'email_banner');
+
+		if ($email_banner == false) {
+			$email_banner = MailBuilder::DEFAULT_EMAIL_BANNER;
+		}
+
 		$additional_info = DI::config()->get('config', 'info');
 
 		// Automatically create temporary paths
@@ -571,6 +585,7 @@ class Site extends BaseAdmin
 			'$sitename'         => ['sitename', DI::l10n()->t('Site name'), DI::config()->get('config', 'sitename'), ''],
 			'$sender_email'     => ['sender_email', DI::l10n()->t('Sender Email'), DI::config()->get('config', 'sender_email'), DI::l10n()->t('The email address your server shall use to send notification emails from.'), '', '', 'email'],
 			'$banner'           => ['banner', DI::l10n()->t('Banner/Logo'), $banner, ''],
+			'$email_banner'     => ['email_banner', DI::l10n()->t('Email Banner/Logo'), $email_banner, ''],
 			'$shortcut_icon'    => ['shortcut_icon', DI::l10n()->t('Shortcut icon'), DI::config()->get('system', 'shortcut_icon'), DI::l10n()->t('Link to an icon that will be used for browsers.')],
 			'$touch_icon'       => ['touch_icon', DI::l10n()->t('Touch icon'), DI::config()->get('system', 'touch_icon'), DI::l10n()->t('Link to an icon that will be used for tablets and mobiles.')],
 			'$additional_info'  => ['additional_info', DI::l10n()->t('Additional Info'), $additional_info, DI::l10n()->t('For public servers: you can add additional information here that will be listed at %s/servers.', Search::getGlobalDirectory())],

src/Module/Admin/Users.php

@@ -76,15 +76,13 @@ class Users extends BaseAdmin
 			$preamble = sprintf($preamble, $user['username'], DI::config()->get('config', 'sitename'));
 			$body = sprintf($body, DI::baseUrl()->get(), $user['nickname'], $result['password'], DI::config()->get('config', 'sitename'));
 
-			notification([
+			$email = DI::emailer()
-				'type'     => SYSTEM_EMAIL,
+				->newSystemMail()
-				'language' => $user['language'],
+				->withMessage(DI::l10n()->t('Registration details for %s', DI::config()->get('config', 'sitename')), $preamble, $body)
-				'to_name'  => $user['username'],
+				->forUser($user)
-				'to_email' => $user['email'],
+				->withRecipient($user['email'])
-				'uid'      => $user['uid'],
+				->build();
-				'subject'  => DI::l10n()->t('Registration details for %s', DI::config()->get('config', 'sitename')),
+			return DI::emailer()->send($email);
-				'preamble' => $preamble,
-				'body'     => $body]);
 		}
 
 		if (!empty($_POST['page_users_block'])) {

src/Module/Invite.php

@@ -77,7 +77,7 @@ class Invite extends BaseModule
 			}
 
 			$additional_headers = 'From: ' . $app->user['email'] . "\n"
-				. 'Sender: ' . $app->getSenderEmailAddress() . "\n"
+				. 'Sender: ' . DI::emailer()->getSiteEmailAddress() . "\n"
 				. 'Content-type: text/plain; charset=UTF-8' . "\n"
 				. 'Content-transfer-encoding: 8bit';
 

src/Util/EMailer/MailBuilder.php

@@ -0,0 +1,199 @@
+<?php
+
+namespace Friendica\Util\EMailer;
+
+use Exception;
+use Friendica\App\BaseURL;
+use Friendica\Core\Config\IConfig;
+use Friendica\Core\L10n;
+use Friendica\Core\Renderer;
+use Friendica\Model\User;
+use Friendica\Network\HTTPException\InternalServerErrorException;
+use Friendica\Object\Email;
+use Friendica\Object\EMail\IEmail;
+use Psr\Log\LoggerInterface;
+
+/**
+ * A base class for building new emails
+ */
+abstract class MailBuilder
+{
+	/** @var string The default email banner in case nothing else is defined */
+	const DEFAULT_EMAIL_BANNER = 'images/friendica-32.png';
+
+	/** @var L10n */
+	protected $l10n;
+	/** @var IConfig */
+	protected $config;
+	/** @var BaseURL */
+	protected $baseUrl;
+	/** @var LoggerInterface */
+	protected $logger;
+
+	/** @var string */
+	protected $headers;
+
+	/** @var string */
+	protected $senderName = null;
+	/** @var string */
+	protected $senderAddress = null;
+	/** @var string */
+	protected $senderNoReply = null;
+
+	/** @var string */
+	protected $recipientAddress = null;
+	/** @var int */
+	protected $recipientUid = null;
+
+	public function __construct(L10n $l10n, BaseURL $baseUrl, IConfig $config, LoggerInterface $logger)
+	{
+		$this->l10n    = $l10n;
+		$this->baseUrl = $baseUrl;
+		$this->config  = $config;
+		$this->logger  = $logger;
+
+		$hostname = $baseUrl->getHostname();
+		if (strpos($hostname, ':')) {
+			$hostname = substr($hostname, 0, strpos($hostname, ':'));
+		}
+
+		$this->headers = "";
+		$this->headers .= "Precedence: list\n";
+		$this->headers .= "X-Friendica-Host: " . $hostname . "\n";
+		$this->headers .= "X-Friendica-Platform: " . FRIENDICA_PLATFORM . "\n";
+		$this->headers .= "X-Friendica-Version: " . FRIENDICA_VERSION . "\n";
+		$this->headers .= "List-ID: <notification." . $hostname . ">\n";
+		$this->headers .= "List-Archive: <" . $baseUrl->get() . "/notifications/system>\n";
+	}
+
+	/**
+	 * Gets the subject of the concrete builder, which inherits this base class
+	 *
+	 * @return string
+	 */
+	abstract protected function getSubject();
+
+	/**
+	 * Gets the HTML version of the body of the concrete builder, which inherits this base class
+	 *
+	 * @return string
+	 */
+	abstract protected function getHtmlMessage();
+
+	/**
+	 * Gets the Plaintext version of the body of the concrete builder, which inherits this base class
+	 *
+	 * @return string
+	 */
+	abstract protected function getPlaintextMessage();
+
+	/**
+	 * Adds the User ID to the email in case the mail sending needs additional properties of this user
+	 *
+	 * @param array $user The user entity/array, for which the email should be sent
+	 *
+	 * @return static
+	 * @todo Once the user array is replaced with a user entity, replace this array parameter as well
+	 */
+	public function forUser(array $user)
+	{
+		$this->recipientUid = $user['uid'] ?? 0;
+		try {
+			$this->l10n = $user['language'] ? $this->l10n->withLang($user['language']) : $this->l10n;
+		} catch (Exception $e) {
+			$this->logger->warning('cannot use language.', ['user' => $user, 'exception' => $e]);
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Adds the sender to the email (if not called/set, the sender will get loaded with the help of the user id)
+	 *
+	 * @param string      $name    The name of the sender
+	 * @param string      $address The (email) address of the sender
+	 * @param string|null $noReply Optional "no-reply" (email) address (if not set, it's the same as the address)
+	 *
+	 * @return static
+	 */
+	public function withSender(string $name, string $address, string $noReply = null)
+	{
+		$this->senderName    = $name;
+		$this->senderAddress = $address;
+		$this->senderNoReply = $noReply ?? $this->senderNoReply;
+
+		return $this;
+	}
+
+	/**
+	 * Adds a recipient to the email
+	 *
+	 * @param string $address The (email) address of the recipient
+	 *
+	 * @return static
+	 */
+	public function withRecipient(string $address)
+	{
+		$this->recipientAddress = $address;
+
+		return $this;
+	}
+
+	/**
+	 * Build a email based on the given attributes
+	 *
+	 * @param bool $raw True, if the email shouldn't get extended by the default email-template
+	 *
+	 * @return IEmail A new generated email
+	 *
+	 * @throws InternalServerErrorException
+	 * @throws Exception
+	 */
+	public function build(bool $raw = false)
+	{
+		if ((empty($this->recipientAddress)) &&
+		    !empty($this->recipientUid)) {
+			$user = User::getById($this->recipientUid, ['email']);
+
+			if (!empty($user['email'])) {
+				$this->recipientAddress = $user['email'];
+			}
+		}
+
+		if (empty($this->recipientAddress)) {
+			throw new InternalServerErrorException('Recipient address is missing.');
+		}
+
+		if (empty($this->senderAddress) || empty($this->senderName)) {
+			throw new InternalServerErrorException('Sender address or name is missing.');
+		}
+
+		$this->senderNoReply = $this->senderNoReply ?? $this->senderAddress;
+
+		$msgHtml = $this->getHtmlMessage() ?? '';
+
+		if (!$raw) {
+			// load the template for private message notifications
+			$tpl     = Renderer::getMarkupTemplate('email/html.tpl');
+			$msgHtml = Renderer::replaceMacros($tpl, [
+				'$title'       => $this->l10n->t('Friendica Notification'),
+				'$product'     => FRIENDICA_PLATFORM,
+				'$htmlversion' => $msgHtml,
+				'$sitename'    => $this->config->get('config', 'sitename'),
+				'$banner'      => $this->config->get('system', 'email_banner',
+					$this->baseUrl->get(true) . DIRECTORY_SEPARATOR . self::DEFAULT_EMAIL_BANNER),
+			]);
+		}
+
+		return new Email(
+			$this->senderName,
+			$this->senderAddress,
+			$this->senderNoReply,
+			$this->recipientAddress,
+			$this->getSubject() ?? '',
+			$msgHtml,
+			$this->getPlaintextMessage() ?? '',
+			$this->headers,
+			$this->recipientUid ?? null);
+	}
+}

src/Util/EMailer/SystemMailBuilder.php

@@ -0,0 +1,114 @@
+<?php
+
+namespace Friendica\Util\EMailer;
+
+use Exception;
+use Friendica\App\BaseURL;
+use Friendica\Content\Text\BBCode;
+use Friendica\Core\Config\IConfig;
+use Friendica\Core\L10n;
+use Friendica\Core\Renderer;
+use Friendica\Network\HTTPException\InternalServerErrorException;
+use Psr\Log\LoggerInterface;
+
+/**
+ * Builder for system-wide emails without any dependency to concrete entities (like items, activities, ..)
+ */
+class SystemMailBuilder extends MailBuilder
+{
+	/** @var string */
+	protected $subject;
+	/** @var string */
+	protected $preamble;
+	/** @var string */
+	protected $body;
+
+	/** @var string */
+	protected $siteAdmin;
+
+	public function __construct(L10n $l10n, BaseURL $baseUrl, IConfig $config, LoggerInterface $logger,
+	                            string $siteEmailAddress, string $siteName)
+	{
+		parent::__construct($l10n, $baseUrl, $config, $logger);
+
+		if ($this->config->get('config', 'admin_name')) {
+			$this->siteAdmin = $l10n->t('%1$s, %2$s Administrator', $this->config->get('config', 'admin_name'), $siteName);
+		} else {
+			$this->siteAdmin = $l10n->t('%s Administrator', $siteName);
+		}
+
+		// Set the system wide site address/name as sender (default for system mails)
+		$this->senderName    = $siteName;
+		$this->senderAddress = $siteEmailAddress;
+		$this->senderNoReply = $siteEmailAddress;
+	}
+
+	/**
+	 * Adds a message
+	 *
+	 * @param string      $subject  The subject of the email
+	 * @param string      $preamble The preamble of the email
+	 * @param string|null $body     The body of the email (if not set, the preamble will get used as body)
+	 *
+	 * @return static
+	 */
+	public function withMessage(string $subject, string $preamble, string $body = null)
+	{
+		if (!isset($body)) {
+			$body = $preamble;
+		}
+
+		$this->subject  = $subject;
+		$this->preamble = $preamble;
+		$this->body     = $body;
+
+		return $this;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	protected function getSubject()
+	{
+		return $this->subject;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * @throws InternalServerErrorException
+	 * @throws Exception
+	 */
+	protected function getHtmlMessage()
+	{
+		$htmlVersion = BBCode::convert($this->body);
+
+		// load the template for private message notifications
+		$tpl = Renderer::getMarkupTemplate('email/system/html.tpl');
+		return Renderer::replaceMacros($tpl, [
+			'$preamble'    => str_replace("\n", "<br>\n", $this->preamble),
+			'$thanks'      => $this->l10n->t('thanks'),
+			'$site_admin'  => $this->siteAdmin,
+			'$htmlversion' => $htmlVersion,
+		]);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 *
+	 * @throws Exception
+	 */
+	protected function getPlaintextMessage()
+	{
+		$textVersion = BBCode::toPlaintext($this->body);
+
+		// load the template for private message notifications
+		$tpl = Renderer::getMarkupTemplate('email/system/text.tpl');
+		return Renderer::replaceMacros($tpl, [
+			'$preamble'    => $this->preamble,
+			'$thanks'      => $this->l10n->t('thanks'),
+			'$site_admin'  => $this->siteAdmin,
+			'$textversion' => $textVersion,
+		]);
+	}
+}

src/Util/Emailer.php

@@ -7,10 +7,12 @@ namespace Friendica\Util;
 use Friendica\App;
 use Friendica\Core\Config\IConfig;
 use Friendica\Core\Hook;
+use Friendica\Core\L10n;
 use Friendica\Core\PConfig\IPConfig;
 use Friendica\Network\HTTPException\InternalServerErrorException;
 use Friendica\Object\EMail\IEmail;
 use Friendica\Protocol\Email;
+use Friendica\Util\EMailer\SystemMailBuilder;
 use Psr\Log\LoggerInterface;
 
 /**
@@ -26,13 +28,65 @@ class Emailer
 	private $logger;
 	/** @var App\BaseURL */
 	private $baseUrl;
+	/** @var L10n */
+	private $l10n;
 
-	public function __construct(IConfig $config, IPConfig $pConfig, App\BaseURL $baseURL, LoggerInterface $logger)
+	/** @var string */
+	private $siteEmailAddress;
+	/** @var string */
+	private $siteEmailName;
+
+	public function __construct(IConfig $config, IPConfig $pConfig, App\BaseURL $baseURL, LoggerInterface $logger,
+	                            L10n $defaultLang)
 	{
 		$this->config      = $config;
 		$this->pConfig     = $pConfig;
 		$this->logger      = $logger;
 		$this->baseUrl     = $baseURL;
+		$this->l10n        = $defaultLang;
+
+		$this->siteEmailAddress = $this->config->get('config', 'sender_email');
+		if (empty($sysEmailAddress)) {
+			$hostname = $this->baseUrl->getHostname();
+			if (strpos($hostname, ':')) {
+				$hostname = substr($hostname, 0, strpos($hostname, ':'));
+			}
+
+			$this->siteEmailAddress = 'noreply@' . $hostname;
+		}
+
+		$this->siteEmailName = $this->config->get('config', 'sitename', 'Friendica Social Network');
+	}
+
+	/**
+	 * Gets the site's default sender email address
+	 *
+	 * @return string
+	 */
+	public function getSiteEmailAddress()
+	{
+		return $this->siteEmailAddress;
+	}
+
+	/**
+	 * Gets the site's default sender name
+	 *
+	 * @return string
+	 */
+	public function getSiteEmailName()
+	{
+		return $this->siteEmailName;
+	}
+
+	/**
+	 * Creates a new system email
+	 *
+	 * @return SystemMailBuilder
+	 */
+	public function newSystemMail()
+	{
+		return new SystemMailBuilder($this->l10n, $this->baseUrl, $this->config, $this->logger,
+			$this->getSiteEmailAddress(), $this->getSiteEmailName());
 	}
 
 	/**

tests/Util/SampleMailBuilder.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Friendica\Test\Util;
+
+use Friendica\Util\EMailer\MailBuilder;
+
+class SampleMailBuilder extends MailBuilder
+{
+	/** @var string */
+	protected $subject;
+	/** @var string */
+	protected $html;
+	/** @var string */
+	protected $text;
+
+	/**
+	 * Adds a test message
+	 *
+	 * @param string $subject The subject of the email
+	 * @param string $html    The preamble of the email
+	 * @param string $text    The body of the email (if not set, the preamble will get used as body)
+	 *
+	 * @return static
+	 */
+	public function withMessage(string $subject, string $html, string $text)
+	{
+		$this->subject = $subject;
+		$this->html    = $html;
+		$this->text    = $text;
+
+		return $this;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	protected function getSubject()
+	{
+		return $this->subject;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	protected function getHtmlMessage()
+	{
+		return $this->html;
+	}
+
+	/**
+	 * @inheritDoc
+	 */
+	protected function getPlaintextMessage()
+	{
+		return $this->text;
+	}
+}

tests/src/Util/Emailer/MailBuilderTest.php

@@ -0,0 +1,177 @@
+<?php
+
+namespace Friendica\Test\src\Util\Emailer;
+
+use Friendica\App\BaseURL;
+use Friendica\Core\Config\IConfig;
+use Friendica\Core\L10n;
+use Friendica\Object\EMail\IEmail;
+use Friendica\Test\MockedTest;
+use Friendica\Test\Util\SampleMailBuilder;
+use Friendica\Test\Util\VFSTrait;
+use Friendica\Util\EMailer\MailBuilder;
+use Psr\Log\NullLogger;
+
+/**
+ * This class tests the "MailBuilder" (@see MailBuilder )
+ * Since it's an abstract class and every extended class of it has dependencies, we use a "SampleMailBuilder" (@see SampleMailBuilder ) to make this class work
+ */
+class MailBuilderTest extends MockedTest
+{
+	use VFSTrait;
+
+	/** @var IConfig */
+	private $config;
+	/** @var L10n */
+	private $l10n;
+	/** @var BaseURL */
+	private $baseUrl;
+
+	/** @var string */
+	private $defaultHeaders;
+
+	public function setUp()
+	{
+		parent::setUp();
+
+		$this->setUpVfsDir();
+
+		$this->config  = \Mockery::mock(IConfig::class);
+		$this->l10n    = \Mockery::mock(L10n::class);
+		$this->baseUrl = \Mockery::mock(BaseURL::class);
+		$this->baseUrl->shouldReceive('getHostname')->andReturn('friendica.local');
+		$this->baseUrl->shouldReceive('get')->andReturn('http://friendica.local');
+
+		$this->defaultHeaders = "";
+	}
+
+	public function assertEmail(IEmail $email, array $asserts)
+	{
+		$this->assertEquals($asserts['subject'] ?? $email->getSubject(), $email->getSubject());
+		$this->assertEquals($asserts['html'] ?? $email->getMessage(), $email->getMessage());
+		$this->assertEquals($asserts['text'] ?? $email->getMessage(true), $email->getMessage(true));
+		$this->assertEquals($asserts['toAddress'] ?? $email->getToAddress(), $email->getToAddress());
+		$this->assertEquals($asserts['fromAddress'] ?? $email->getFromAddress(), $email->getFromAddress());
+		$this->assertEquals($asserts['fromName'] ?? $email->getFromName(), $email->getFromName());
+		$this->assertEquals($asserts['replyTo'] ?? $email->getReplyTo(), $email->getReplyTo());
+		$this->assertEquals($asserts['uid'] ?? $email->getRecipientUid(), $email->getRecipientUid());
+		$this->assertEquals($asserts['header'] ?? $email->getAdditionalMailHeader(), $email->getAdditionalMailHeader());
+	}
+
+	/**
+	 * Test if the builder instance can get created
+	 */
+	public function testBuilderInstance()
+	{
+		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
+
+		$this->assertInstanceOf(MailBuilder::class, $builder);
+	}
+
+	/**
+	 * Test if the builder can create full rendered emails
+	 *
+	 * @todo Create test once "Renderer" and "BBCode" are dynamic
+	 */
+	public function testBuilderWithNonRawEmail()
+	{
+		$this->markTestIncomplete('Cannot easily mock Renderer and BBCode, so skipping tests wit them');
+	}
+
+	/**
+	 * Test if the builder can create a "simple" raw mail
+	 */
+	public function testBuilderWithRawEmail()
+	{
+		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
+
+		$testEmail = $builder
+			->withMessage('Subject', 'Html', 'text')
+			->withRecipient('recipient@friendica.local')
+			->withSender('Sender', 'sender@friendica.local', 'no-reply@friendica.local')
+			->forUser(['uid' => 100])
+			->build(true);
+
+		$this->assertEmail($testEmail, [
+			'subject' => 'Subject',
+			'html' => 'Html',
+			'text' => 'text',
+			'toAddress' => 'recipient@friendica.local',
+			'fromName' => 'Sender',
+			'fromAddress' => 'sender@friendica.local',
+			'noReply' => 'no-reply@friendica.local',
+			'uid' => 100,
+			'headers' => $this->defaultHeaders,
+		]);
+	}
+
+	/**
+	 * Test if the builder throws an exception in case no recipient
+	 *
+	 * @expectedException \Friendica\Network\HTTPException\InternalServerErrorException
+	 * @expectedExceptionMessage Recipient address is missing.
+	 */
+	public function testBuilderWithEmptyMail()
+	{
+		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
+
+		$builder->build(true);
+	}
+
+	/**
+	 * Test if the builder throws an exception in case no sender
+	 *
+	 * @expectedException \Friendica\Network\HTTPException\InternalServerErrorException
+	 * @expectedExceptionMessage Sender address or name is missing.
+	 */
+	public function testBuilderWithEmptySender()
+	{
+		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
+
+		$builder
+			->withRecipient('test@friendica.local')
+			->build(true);
+	}
+
+	/**
+	 * Test if the builder is capable of creating "empty" mails if needed (not the decision of the builder if so ..)
+	 */
+	public function testBuilderWithoutMessage()
+	{
+		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
+
+		$testEmail = $builder
+			->withRecipient('recipient@friendica.local')
+			->withSender('Sender', 'sender@friendica.local')
+			->build(true);
+
+		$this->assertEmail($testEmail, [
+			'toAddress' => 'recipient@friendica.local',
+			'fromName' => 'Sender',
+			'fromAddress' => 'sender@friendica.local',
+			'noReply' => 'sender@friendica.local', // no-reply is set same as address in case it's not set
+			'headers' => $this->defaultHeaders,
+		]);
+	}
+
+	/**
+	 * Test if the builder sets for the text the same as for
+	 */
+	public function testBuilderWithJustPreamble()
+	{
+		$builder = new SampleMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger());
+
+		$testEmail = $builder
+			->withRecipient('recipient@friendica.local')
+			->withSender('Sender', 'sender@friendica.local')
+			->build(true);
+
+		$this->assertEmail($testEmail, [
+			'toAddress' => 'recipient@friendica.local',
+			'fromName' => 'Sender',
+			'fromAddress' => 'sender@friendica.local',
+			'noReply' => 'sender@friendica.local', // no-reply is set same as address in case it's not set,
+			'headers' => $this->defaultHeaders,
+		]);
+	}
+}

tests/src/Util/Emailer/SystemMailBuilderTest.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace Friendica\Test\src\Util\Emailer;
+
+use Friendica\App\BaseURL;
+use Friendica\Core\Config\IConfig;
+use Friendica\Core\L10n;
+use Friendica\Test\MockedTest;
+use Friendica\Test\Util\VFSTrait;
+use Friendica\Util\EMailer\MailBuilder;
+use Friendica\Util\EMailer\SystemMailBuilder;
+use Psr\Log\NullLogger;
+
+class SystemMailBuilderTest extends MockedTest
+{
+	use VFSTrait;
+
+	/** @var IConfig */
+	private $config;
+	/** @var L10n */
+	private $l10n;
+	/** @var BaseURL */
+	private $baseUrl;
+
+	/** @var string */
+	private $defaultHeaders;
+
+	public function setUp()
+	{
+		parent::setUp();
+
+		$this->setUpVfsDir();
+
+		$this->config  = \Mockery::mock(IConfig::class);
+		$this->config->shouldReceive('get')->with('config', 'admin_name')->andReturn('Admin');
+		$this->l10n    = \Mockery::mock(L10n::class);
+		$this->l10n->shouldReceive('t')->andReturnUsing(function ($msg) {
+			return $msg;
+		});
+		$this->baseUrl = \Mockery::mock(BaseURL::class);
+		$this->baseUrl->shouldReceive('getHostname')->andReturn('friendica.local');
+		$this->baseUrl->shouldReceive('get')->andReturn('http://friendica.local');
+
+		$this->defaultHeaders = "";
+	}
+
+	/**
+	 * Test if the builder instance can get created
+	 */
+	public function testBuilderInstance()
+	{
+		$builder = new SystemMailBuilder($this->l10n, $this->baseUrl, $this->config, new NullLogger(), 'moreply@friendica.local', 'FriendicaSite');
+
+		$this->assertInstanceOf(MailBuilder::class, $builder);
+		$this->assertInstanceOf(SystemMailBuilder::class, $builder);
+	}
+}

view/templates/admin/site.tpl

@@ -15,6 +15,7 @@
 	{{include file="field_input.tpl" field=$sitename}}
 	{{include file="field_input.tpl" field=$sender_email}}
 	{{include file="field_textarea.tpl" field=$banner}}
+	{{include file="field_input.tpl" field=$email_banner}}
 	{{include file="field_input.tpl" field=$shortcut_icon}}
 	{{include file="field_input.tpl" field=$touch_icon}}
 	{{include file="field_textarea.tpl" field=$additional_info}}

view/templates/email/html.tpl

@@ -0,0 +1,23 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional //EN">
+<html>
+<head>
+	<title>{{$title}}</title>
+	<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
+</head>
+<body>
+	<table style="border:1px solid #ccc">
+	<tbody>
+		<tr>
+			<td style="background:#084769; color:#FFFFFF; font-weight:bold; font-family:'lucida grande', tahoma, verdana,arial, sans-serif; padding: 4px 8px; vertical-align: middle; font-size:16px; letter-spacing: -0.03em; text-align: left;">
+				<img style="width:32px;height:32px; float:left;" src="{{$banner}}" alt="Friendica Banner">
+				<div style="padding:7px; margin-left: 5px; float:left; font-size:18px;letter-spacing:1px;">{{$product}}</div>
+				<div style="clear: both;"></div>
+			</td>
+		</tr>
+	</tbody>
+	</table>
+	<p>
+	{{$htmlversion nofilter}}
+	</p>
+</body>
+</html>

view/templates/email/system/html.tpl

@@ -0,0 +1,5 @@
+<table>
+<tr><td style="padding-right:22px;">{{$htmlversion nofilter}}</td></tr>
+<tr><td>{{$thanks}}</td></tr>
+<tr><td>{{$site_admin}}</td></tr>
+</table>

view/templates/email/system/text.tpl

@@ -0,0 +1,7 @@
+
+{{$preamble nofilter}}
+
+{{$textversion nofilter}}
+
+{{$thanks nofilter}}
+{{$site_admin nofilter}}