CRM/Utils/Mail.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | Copyright CiviCRM LLC. All rights reserved.                        |
   5  |                                                                    |
   6  | This work is published under the GNU AGPLv3 license with some      |
   7  | permitted exceptions and without any warranty. For full license    |
   8  | and copyright information, see https://civicrm.org/licensing       |
   9  +--------------------------------------------------------------------+
  10  */
  11
  12 /**
  13  *
  14  * @package CRM
  15  * @copyright CiviCRM LLC https://civicrm.org/licensing
  16  */
  17 class CRM_Utils_Mail {
  18
  19   /**
  20    * Create a new mailer to send any mail from the application.
  21    *
  22    * Note: The mailer is opened in persistent mode.
  23    *
  24    * Note: You probably don't want to call this directly. Get a reference
  25    * to the mailer through the container.
  26    *
  27    * @return Mail
  28    *
  29    * @throws CRM_Core_Exception
  30    */
  31   public static function createMailer() {
  32     $mailingInfo = Civi::settings()->get('mailing_backend');
  33
  34     /*@var Mail $mailer*/
  35     if ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_REDIRECT_TO_DB ||
  36       (defined('CIVICRM_MAILER_SPOOL') && CIVICRM_MAILER_SPOOL)
  37     ) {
  38       $mailer = self::_createMailer('CRM_Mailing_BAO_Spool', []);
  39     }
  40     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_SMTP) {
  41       if ($mailingInfo['smtpServer'] == '' || !$mailingInfo['smtpServer']) {
  42         CRM_Core_Error::debug_log_message(ts('There is no valid smtp server setting. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the SMTP Server.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
  43         throw new CRM_Core_Exception(ts('There is no valid smtp server setting. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the SMTP Server.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
  44       }
  45
  46       $params['host'] = $mailingInfo['smtpServer'] ? $mailingInfo['smtpServer'] : 'localhost';
  47       $params['port'] = $mailingInfo['smtpPort'] ? $mailingInfo['smtpPort'] : 25;
  48
  49       if ($mailingInfo['smtpAuth']) {
  50         $params['username'] = $mailingInfo['smtpUsername'];
  51         $params['password'] = \Civi::service('crypto.token')->decrypt($mailingInfo['smtpPassword']);
  52         $params['auth'] = TRUE;
  53       }
  54       else {
  55         $params['auth'] = FALSE;
  56       }
  57
  58       /*
  59        * Set the localhost value, CRM-3153
  60        * Use the host name of the web server, falling back to the base URL
  61        * (eg when using the PHP CLI), and then falling back to localhost.
  62        */
  63       $params['localhost'] = CRM_Utils_Array::value(
  64         'SERVER_NAME',
  65         $_SERVER,
  66         CRM_Utils_Array::value(
  67           'host',
  68           parse_url(CIVICRM_UF_BASEURL),
  69           'localhost'
  70         )
  71       );
  72
  73       // also set the timeout value, lets set it to 30 seconds
  74       // CRM-7510
  75       $params['timeout'] = 30;
  76
  77       // CRM-9349
  78       $params['persist'] = TRUE;
  79
  80       $mailer = self::_createMailer('smtp', $params);
  81     }
  82     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_SENDMAIL) {
  83       if ($mailingInfo['sendmail_path'] == '' ||
  84         !$mailingInfo['sendmail_path']
  85       ) {
  86         CRM_Core_Error::debug_log_message(ts('There is no valid sendmail path setting. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the sendmail server.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
  87         throw new CRM_Core_Exception(ts('There is no valid sendmail path setting. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the sendmail server.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
  88       }
  89       $params['sendmail_path'] = $mailingInfo['sendmail_path'];
  90       $params['sendmail_args'] = $mailingInfo['sendmail_args'];
  91
  92       $mailer = self::_createMailer('sendmail', $params);
  93     }
  94     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_MAIL) {
  95       $mailer = self::_createMailer('mail', []);
  96     }
  97     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_MOCK) {
  98       $mailer = self::_createMailer('mock', $mailingInfo);
  99     }
 100     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_DISABLED) {
 101       CRM_Core_Error::debug_log_message(ts('Outbound mail has been disabled. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the OutBound Email.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
 102       CRM_Core_Error::statusBounce(ts('Outbound mail has been disabled. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the OutBound Email.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
 103     }
 104     else {
 105       CRM_Core_Error::debug_log_message(ts('There is no valid SMTP server Setting Or SendMail path setting. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the OutBound Email.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
 106       CRM_Core_Error::debug_var('mailing_info', $mailingInfo);
 107       CRM_Core_Error::statusBounce(ts('There is no valid SMTP server Setting Or sendMail path setting. Click <a href=\'%1\'>Administer >> System Setting >> Outbound Email</a> to set the OutBound Email.', [1 => CRM_Utils_System::url('civicrm/admin/setting/smtp', 'reset=1')]));
 108     }
 109     return $mailer;
 110   }
 111
 112   /**
 113    * Create a new instance of a PEAR Mail driver.
 114    *
 115    * @param string $driver
 116    *   'CRM_Mailing_BAO_Spool' or a name suitable for Mail::factory().
 117    * @param array $params
 118    * @return object
 119    *   More specifically, a class which implements the "send()" function
 120    */
 121   public static function _createMailer($driver, $params) {
 122     if ($driver == 'CRM_Mailing_BAO_Spool') {
 123       $mailer = new CRM_Mailing_BAO_Spool($params);
 124     }
 125     else {
 126       $mailer = Mail::factory($driver, $params);
 127     }
 128
 129     // Previously, CiviCRM bundled patches to change the behavior of 3 specific drivers. Use wrapper/filters to avoid patching.
 130     $mailer = new CRM_Utils_Mail_FilteredPearMailer($driver, $params, $mailer);
 131     if (in_array($driver, ['smtp', 'mail', 'sendmail'])) {
 132       $mailer->addFilter('2000_log', ['CRM_Utils_Mail_Logger', 'filter']);
 133       $mailer->addFilter('2100_validate', function ($mailer, &$recipients, &$headers, &$body) {
 134         if (!is_array($headers)) {
 135           return PEAR::raiseError('$headers must be an array');
 136         }
 137       });
 138     }
 139     CRM_Utils_Hook::alterMailer($mailer, $driver, $params);
 140     return $mailer;
 141   }
 142
 143   /**
 144    * Wrapper function to send mail in CiviCRM. Hooks are called from this function. The input parameter
 145    * is an associateive array which holds the values of field needed to send an email. These are:
 146    *
 147    * from    : complete from envelope
 148    * toName  : name of person to send email
 149    * toEmail : email address to send to
 150    * cc      : email addresses to cc
 151    * bcc     : email addresses to bcc
 152    * subject : subject of the email
 153    * text    : text of the message
 154    * html    : html version of the message
 155    * replyTo : reply-to header in the email
 156    * returnpath : email address for bounces to be sent to
 157    * messageId : Message ID for this email mesage
 158    * attachments: an associative array of
 159    *   fullPath : complete pathname to the file
 160    *   mime_type: mime type of the attachment
 161    *   cleanName: the user friendly name of the attachmment
 162    *
 163    * @param array $params
 164    *   (by reference).
 165    *
 166    * @return bool
 167    *   TRUE if a mail was sent, else FALSE.
 168    */
 169   public static function send(&$params) {
 170     $defaultReturnPath = CRM_Core_BAO_MailSettings::defaultReturnPath();
 171     $includeMessageId = CRM_Core_BAO_MailSettings::includeMessageId();
 172     $emailDomain = CRM_Core_BAO_MailSettings::defaultDomain();
 173     $from = $params['from'] ?? NULL;
 174     if (!$defaultReturnPath) {
 175       $defaultReturnPath = self::pluckEmailFromHeader($from);
 176     }
 177
 178     // first call the mail alter hook
 179     CRM_Utils_Hook::alterMailParams($params, 'singleEmail');
 180
 181     // check if any module has aborted mail sending
 182     if (!empty($params['abortMailSend']) || empty($params['toEmail'])) {
 183       return FALSE;
 184     }
 185
 186     $textMessage = $params['text'] ?? NULL;
 187     $htmlMessage = $params['html'] ?? NULL;
 188     $attachments = $params['attachments'] ?? NULL;
 189
 190     // CRM-6224
 191     if (trim(CRM_Utils_String::htmlToText($htmlMessage)) == '') {
 192       $htmlMessage = FALSE;
 193     }
 194
 195     $headers = [];
 196     // CRM-10699 support custom email headers
 197     if (!empty($params['headers'])) {
 198       $headers = array_merge($headers, $params['headers']);
 199     }
 200     $headers['From'] = $params['from'];
 201     $headers['To'] = self::formatRFC822Email(
 202       CRM_Utils_Array::value('toName', $params),
 203       CRM_Utils_Array::value('toEmail', $params),
 204       FALSE
 205     );
 206
 207     // On some servers mail() fails when 'Cc' or 'Bcc' headers are defined but empty.
 208     foreach (['Cc', 'Bcc'] as $optionalHeader) {
 209       $headers[$optionalHeader] = $params[strtolower($optionalHeader)] ?? NULL;
 210       if (empty($headers[$optionalHeader])) {
 211         unset($headers[$optionalHeader]);
 212       }
 213     }
 214
 215     $headers['Subject'] = $params['subject'] ?? NULL;
 216     $headers['Content-Type'] = $htmlMessage ? 'multipart/mixed; charset=utf-8' : 'text/plain; charset=utf-8';
 217     $headers['Content-Disposition'] = 'inline';
 218     $headers['Content-Transfer-Encoding'] = '8bit';
 219     $headers['Return-Path'] = CRM_Utils_Array::value('returnPath', $params, $defaultReturnPath);
 220
 221     // CRM-11295: Omit reply-to headers if empty; this avoids issues with overzealous mailservers
 222     $replyTo = CRM_Utils_Array::value('replyTo', $params, CRM_Utils_Array::value('from', $params));
 223
 224     if (!empty($replyTo)) {
 225       $headers['Reply-To'] = $replyTo;
 226     }
 227     $headers['Date'] = date('r');
 228     if ($includeMessageId) {
 229       $headers['Message-ID'] = $params['messageId'] ?? '<' . uniqid('civicrm_', TRUE) . "@$emailDomain>";
 230     }
 231     if (!empty($params['autoSubmitted'])) {
 232       $headers['Auto-Submitted'] = "Auto-Generated";
 233     }
 234
 235     // make sure we has to have space, CRM-6977
 236     foreach (['From', 'To', 'Cc', 'Bcc', 'Reply-To', 'Return-Path'] as $fld) {
 237       if (isset($headers[$fld])) {
 238         $headers[$fld] = str_replace('"<', '" <', $headers[$fld]);
 239       }
 240     }
 241
 242     // quote FROM, if comma is detected AND is not already quoted. CRM-7053
 243     if (strpos($headers['From'], ',') !== FALSE) {
 244       $from = explode(' <', $headers['From']);
 245       $headers['From'] = self::formatRFC822Email(
 246         $from[0],
 247         substr(trim($from[1]), 0, -1),
 248         TRUE
 249       );
 250     }
 251
 252     require_once 'Mail/mime.php';
 253     $msg = new Mail_mime("\n");
 254     if ($textMessage) {
 255       $msg->setTxtBody($textMessage);
 256     }
 257
 258     if ($htmlMessage) {
 259       $msg->setHTMLBody($htmlMessage);
 260     }
 261
 262     if (!empty($attachments)) {
 263       foreach ($attachments as $fileID => $attach) {
 264         $msg->addAttachment(
 265           $attach['fullPath'],
 266           $attach['mime_type'],
 267           $attach['cleanName'],
 268           TRUE,
 269           'base64',
 270           'attachment',
 271           (isset($attach['charset']) ? $attach['charset'] : '')
 272         );
 273       }
 274     }
 275
 276     $message = self::setMimeParams($msg);
 277     $headers = $msg->headers($headers);
 278
 279     $to = [$params['toEmail']];
 280     $result = NULL;
 281     $mailer = \Civi::service('pear_mail');
 282
 283     // CRM-3795, CRM-7355, CRM-7557, CRM-9058, CRM-9887, CRM-12883, CRM-19173 and others ...
 284     // The PEAR library requires different parameters based on the mailer used:
 285     // * Mail_mail requires the Cc/Bcc recipients listed ONLY in the $headers variable
 286     // * All other mailers require that all be recipients be listed in the $to array AND that
 287     //   the Bcc must not be present in $header as otherwise it will be shown to all recipients
 288     // ref: https://pear.php.net/bugs/bug.php?id=8047, full thread and answer [2011-04-19 20:48 UTC]
 289     // TODO: Refactor this quirk-handler as another filter in FilteredPearMailer. But that would merit review of impact on universe.
 290     $driver = ($mailer instanceof CRM_Utils_Mail_FilteredPearMailer) ? $mailer->getDriver() : NULL;
 291     $isPhpMail = (get_class($mailer) === "Mail_mail" || $driver === 'mail');
 292     if (!$isPhpMail) {
 293       // get emails from headers, since these are
 294       // combination of name and email addresses.
 295       if (!empty($headers['Cc'])) {
 296         $to[] = $headers['Cc'] ?? NULL;
 297       }
 298       if (!empty($headers['Bcc'])) {
 299         $to[] = $headers['Bcc'] ?? NULL;
 300         unset($headers['Bcc']);
 301       }
 302     }
 303
 304     if (is_object($mailer)) {
 305       try {
 306         $result = $mailer->send($to, $headers, $message);
 307       }
 308       catch (Exception $e) {
 309         CRM_Core_Session::setStatus($e->getMessage(), ts('Mailing Error'), 'error');
 310         return FALSE;
 311       }
 312       if (is_a($result, 'PEAR_Error')) {
 313         $message = self::errorMessage($mailer, $result);
 314         // append error message in case multiple calls are being made to
 315         // this method in the course of sending a batch of messages.
 316         CRM_Core_Session::setStatus($message, ts('Mailing Error'), 'error');
 317         return FALSE;
 318       }
 319       // CRM-10699
 320       CRM_Utils_Hook::postEmailSend($params);
 321       return TRUE;
 322     }
 323     return FALSE;
 324   }
 325
 326   /**
 327    * @param $mailer
 328    * @param $result
 329    *
 330    * @return string
 331    */
 332   public static function errorMessage($mailer, $result) {
 333     $message = '<p>' . ts('An error occurred when CiviCRM attempted to send an email (via %1). If you received this error after submitting on online contribution or event registration - the transaction was completed, but we were unable to send the email receipt.', [
 334       1 => 'SMTP',
 335     ]) . '</p>' . '<p>' . ts('The mail library returned the following error message:') . '<br /><span class="font-red"><strong>' . $result->getMessage() . '</strong></span></p>' . '<p>' . ts('This is probably related to a problem in your Outbound Email Settings (Administer CiviCRM &raquo; System Settings &raquo; Outbound Email), OR the FROM email address specifically configured for your contribution page or event. Possible causes are:') . '</p>';
 336
 337     if (is_a($mailer, 'Mail_smtp')) {
 338       $message .= '<ul>' . '<li>' . ts('Your SMTP Username or Password are incorrect.') . '</li>' . '<li>' . ts('Your SMTP Server (machine) name is incorrect.') . '</li>' . '<li>' . ts('You need to use a Port other than the default port 25 in your environment.') . '</li>' . '<li>' . ts('Your SMTP server is just not responding right now (it is down for some reason).') . '</li>';
 339     }
 340     else {
 341       $message .= '<ul>' . '<li>' . ts('Your Sendmail path is incorrect.') . '</li>' . '<li>' . ts('Your Sendmail argument is incorrect.') . '</li>';
 342     }
 343
 344     $message .= '<li>' . ts('The FROM Email Address configured for this feature may not be a valid sender based on your email service provider rules.') . '</li>' . '</ul>' . '<p>' . ts('Check <a href="%1">this page</a> for more information.', [
 345       1 => CRM_Utils_System::docURL2('user/advanced-configuration/email-system-configuration', TRUE),
 346     ]) . '</p>';
 347
 348     return $message;
 349   }
 350
 351   /**
 352    * @param $to
 353    * @param $headers
 354    * @param $message
 355    * @deprecated
 356    */
 357   public static function logger(&$to, &$headers, &$message) {
 358     CRM_Utils_Mail_Logger::log($to, $headers, $message);
 359   }
 360
 361   /**
 362    * Get the email address itself from a formatted full name + address string
 363    *
 364    * Ugly but working.
 365    *
 366    * @param string $header
 367    *   The full name + email address string.
 368    *
 369    * @return string
 370    *   the plucked email address
 371    */
 372   public static function pluckEmailFromHeader($header) {
 373     preg_match('/<([^<]*)>$/', $header, $matches);
 374
 375     if (isset($matches[1])) {
 376       return $matches[1];
 377     }
 378     return NULL;
 379   }
 380
 381   /**
 382    * Get the Active outBound email.
 383    *
 384    * @return bool
 385    *   TRUE if valid outBound email configuration found, false otherwise.
 386    */
 387   public static function validOutBoundMail() {
 388     $mailingInfo = Civi::settings()->get('mailing_backend');
 389     if ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_MAIL) {
 390       return TRUE;
 391     }
 392     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_SMTP) {
 393       if (!isset($mailingInfo['smtpServer']) || $mailingInfo['smtpServer'] == '' ||
 394         $mailingInfo['smtpServer'] == 'YOUR SMTP SERVER' ||
 395         ($mailingInfo['smtpAuth'] && ($mailingInfo['smtpUsername'] == '' || $mailingInfo['smtpPassword'] == ''))
 396       ) {
 397         return FALSE;
 398       }
 399       return TRUE;
 400     }
 401     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_SENDMAIL) {
 402       if (!$mailingInfo['sendmail_path'] || !$mailingInfo['sendmail_args']) {
 403         return FALSE;
 404       }
 405       return TRUE;
 406     }
 407     elseif ($mailingInfo['outBound_option'] == CRM_Mailing_Config::OUTBOUND_OPTION_REDIRECT_TO_DB) {
 408       return TRUE;
 409     }
 410     return FALSE;
 411   }
 412
 413   /**
 414    * @param $message
 415    * @param array $params
 416    *
 417    * @return mixed
 418    */
 419   public static function setMimeParams($message, $params = NULL) {
 420     static $mimeParams = NULL;
 421     if (!$params) {
 422       if (!$mimeParams) {
 423         $mimeParams = [
 424           'text_encoding' => '8bit',
 425           'html_encoding' => '8bit',
 426           'head_charset' => 'utf-8',
 427           'text_charset' => 'utf-8',
 428           'html_charset' => 'utf-8',
 429         ];
 430       }
 431       $params = $mimeParams;
 432     }
 433     return $message->get($params);
 434   }
 435
 436   /**
 437    * @param string $name
 438    * @param $email
 439    * @param bool $useQuote
 440    *
 441    * @return null|string
 442    */
 443   public static function formatRFC822Email($name, $email, $useQuote = FALSE) {
 444     $result = NULL;
 445
 446     $name = trim($name);
 447
 448     // strip out double quotes if present at the beginning AND end
 449     if (substr($name, 0, 1) == '"' &&
 450       substr($name, -1, 1) == '"'
 451     ) {
 452       $name = substr($name, 1, -1);
 453     }
 454
 455     if (!empty($name)) {
 456       // escape the special characters
 457       $name = str_replace(['<', '"', '>'],
 458         ['\<', '\"', '\>'],
 459         $name
 460       );
 461       if (strpos($name, ',') !== FALSE ||
 462         $useQuote
 463       ) {
 464         // quote the string if it has a comma
 465         $name = '"' . $name . '"';
 466       }
 467
 468       $result = "$name ";
 469     }
 470
 471     $result .= "<{$email}>";
 472     return $result;
 473   }
 474
 475   /**
 476    * Takes a string and checks to see if it needs to be escaped / double quoted
 477    * and if so does the needful and return the formatted name
 478    *
 479    * This code has been copied and adapted from ezc/Mail/src/tools.php
 480    *
 481    * @param string $name
 482    *
 483    * @return string
 484    */
 485   public static function formatRFC2822Name($name) {
 486     $name = trim($name);
 487     if (!empty($name)) {
 488       // remove the quotes around the name part if they are already there
 489       if (substr($name, 0, 1) == '"' && substr($name, -1) == '"') {
 490         $name = substr($name, 1, -1);
 491       }
 492
 493       // add slashes to " and \ and surround the name part with quotes
 494       if (strpbrk($name, ",@<>:;'\"") !== FALSE) {
 495         $name = '"' . addcslashes($name, '\\"') . '"';
 496       }
 497     }
 498
 499     return $name;
 500   }
 501
 502   /**
 503    * @param string $fileName
 504    * @param string $html
 505    * @param string $format
 506    *
 507    * @return array
 508    */
 509   public static function appendPDF($fileName, $html, $format = NULL) {
 510     $pdf_filename = CRM_Core_Config::singleton()->templateCompileDir . CRM_Utils_File::makeFileName($fileName);
 511
 512     // FIXME : CRM-7894
 513     // xmlns attribute is required in XHTML but it is invalid in HTML,
 514     // Also the namespace "xmlns=http://www.w3.org/1999/xhtml" is default,
 515     // and will be added to the <html> tag even if you do not include it.
 516     $html = preg_replace('/(<html)(.+?xmlns=["\'].[^\s]+["\'])(.+)?(>)/', '\1\3\4', $html);
 517
 518     file_put_contents($pdf_filename, CRM_Utils_PDF_Utils::html2pdf($html,
 519         $fileName,
 520         TRUE,
 521         $format)
 522     );
 523     return [
 524       'fullPath' => $pdf_filename,
 525       'mime_type' => 'application/pdf',
 526       'cleanName' => $fileName,
 527     ];
 528   }
 529
 530   /**
 531    * Format an email string from email fields.
 532    *
 533    * @param array $fields
 534    *   The email fields.
 535    * @return string
 536    *   The formatted email string.
 537    */
 538   public static function format($fields) {
 539     $formattedEmail = '';
 540     if (!empty($fields['email'])) {
 541       $formattedEmail = $fields['email'];
 542     }
 543
 544     $formattedSuffix = [];
 545     if (!empty($fields['is_bulkmail'])) {
 546       $formattedSuffix[] = '(' . ts('Bulk') . ')';
 547     }
 548     if (!empty($fields['on_hold'])) {
 549       if ($fields['on_hold'] == 2) {
 550         $formattedSuffix[] = '(' . ts('On Hold - Opt Out') . ')';
 551       }
 552       else {
 553         $formattedSuffix[] = '(' . ts('On Hold') . ')';
 554       }
 555     }
 556     if (!empty($fields['signature_html']) || !empty($fields['signature_text'])) {
 557       $formattedSuffix[] = '(' . ts('Signature') . ')';
 558     }
 559
 560     // Add suffixes on a new line, if there is any.
 561     if (!empty($formattedSuffix)) {
 562       $formattedEmail .= "\n" . implode(' ', $formattedSuffix);
 563     }
 564
 565     return $formattedEmail;
 566   }
 567
 568   /**
 569    * When passed a value, returns the value if it's non-numeric.
 570    * If it's numeric, look up the display name and email of the corresponding
 571    * contact ID in RFC822 format.
 572    *
 573    * @param string $from
 574    *   contact ID or formatted "From address", eg. 12 or "Fred Bloggs" <fred@example.org>
 575    * @return string
 576    *   The RFC822-formatted email header (display name + address)
 577    */
 578   public static function formatFromAddress($from) {
 579     if (is_numeric($from)) {
 580       $result = civicrm_api3('Email', 'get', [
 581         'id' => $from,
 582         'return' => ['contact_id.display_name', 'email'],
 583         'sequential' => 1,
 584       ])['values'][0];
 585       $from = '"' . $result['contact_id.display_name'] . '" <' . $result['email'] . '>';
 586     }
 587     return $from;
 588   }
 589
 590 }