Fix EncodeQ implementation in PHPMailer, and provide SSL/TLS options

Summary:
See f5c2a2ab4b (commitcomment-2333247)

Copy of working implementation from PHPMailerLite.

Also expose the SSL/TLS options.

Test Plan: Switched to this mailer, configured Gmail SMTP, sent email. Verified email arrived intact.

Reviewers: btrahan, vrana

Reviewed By: btrahan

CC: aran, mbeck

Differential Revision: https://secure.phabricator.com/D4239

externals/phpmailer/class.phpmailer.php

@@ -1710,6 +1710,13 @@ class PHPMailer {
     return $out;
   }
 
+  /**
+   * NOTE: Phabricator patch to remove use of "/e". See D2147.
+   */
+  private function encodeQCallback(array $matches) {
+    return '='.sprintf('%02X', ord($matches[1]));
+  }
+
   /**
    * Encode string to q encoding.
    * @link http://tools.ietf.org/html/rfc2047
@@ -1719,21 +1726,32 @@ class PHPMailer {
    * @return string
    */
   public function EncodeQ ($str, $position = 'text') {
+
+    // NOTE: Phabricator patch to remove use of "/e". See D2147.
+
     // There should not be any EOL in the string
     $encoded = preg_replace('/[\r\n]*/', '', $str);
 
     switch (strtolower($position)) {
       case 'phrase':
-        $encoded = preg_replace("/([^A-Za-z0-9!*+\/ -])/", "'='.sprintf('%02X', ord('\\1'))", $encoded);
+        $encoded = preg_replace_callback(
+          "/([^A-Za-z0-9!*+\/ -])/",
+          array($this, 'encodeQCallback'),
+          $encoded);
         break;
       case 'comment':
-        $encoded = preg_replace("/([\(\)\"])/", "'='.sprintf('%02X', ord('\\1'))", $encoded);
+        $encoded = preg_replace_callback(
+          "/([\(\)\"])/",
+          array($this, 'encodeQCallback'),
+          $encoded);
+        break;
       case 'text':
       default:
         // Replace every high ascii, control =, ? and _ characters
-        //TODO using /e (equivalent to eval()) is probably not a good idea
-        $encoded = preg_replace('/([\000-\011\013\014\016-\037\075\077\137\177-\377])/',
-              "'='.sprintf('%02X', ord('\\1'))", $encoded);
+        $encoded = preg_replace_callback(
+          '/([\000-\011\013\014\016-\037\075\077\137\177-\377])/',
+          array($this, 'encodeQCallback'),
+          $encoded);
         break;
     }