<?php

define("LIBR", "\r\n"); // use a "\n" if you have problems

class attach_mailer {
   
   var $from_name;
   var $from_mail;
   var $mail_to;
   var $mail_cc;
   var $mail_bcc;
   
   var $mail_headers;
   var $mail_subject;
   var $mail_body = "";
   
   var $valid_mail_adresses; // boolean is true if all mail(to) adresses are valid
   var $uid; // the unique value for the mail boundry
   var $mail_priority = 3; // 3 = normal, 2 = high, 4 = low
   
   var $att_files = array();
   var $msg = array();
   
   // functions inside this constructor
   // - validation of e-mail adresses
   // - setting mail variables
   // - setting boolean $valid_mail_adresses
   function attach_mailer($name = "", $from, $to, $cc = "", $bcc = "", $subject = "", $body = "") {
       $this->valid_mail_adresses = true;
       if (!$this->check_mail_address($to)) {
           $this->msg[] = "Error, the \"mailto\" address is empty or not valid.";
           $this->valid_mail_adresses = false;
       }
       if (!$this->check_mail_address($from)) {
           $this->msg[] = "Error, the \"from\" address is empty or not valid.";
           $this->valid_mail_adresses = false;
       }
       if ($cc != "") {
           if (!$this->check_mail_address($cc)) {
               $this->msg[] = "Error, the \"Cc\" address is not valid.";
               $this->valid_mail_adresses = false;
           }
       }
       if ($bcc != "") {
           if (!$this->check_mail_address($bcc)) {
               $this->msg[] = "Error, the \"Bcc\" address is not valid.";
               $this->valid_mail_adresses = false;
           }
       }
       if ($this->valid_mail_adresses) {
           $this->from_name = $this->strip_line_breaks($name);
           $this->from_mail = $this->strip_line_breaks($from);
           $this->mail_to = $this->strip_line_breaks($to);
           $this->mail_cc = $this->strip_line_breaks($cc);
           $this->mail_bcc = $this->strip_line_breaks($bcc);
           $this->mail_subject = $this->strip_line_breaks($subject);
           $this->create_mime_boundry();
           $this->mail_body = $this->create_msg_body($body);
           $this->mail_headers = $this->create_mail_headers();
       } else {
           return;
       }         
   }
   function get_msg_str() {
       $messages = "";
       foreach($this->msg as $val) {
           $messages .= $val."<br>\n";
       }
       return $messages;             
   }
   // use this to prent formmail spamming
   function strip_line_breaks($val) {
       $val = preg_replace("/([\r\n])/", "", $val);
       return $val;
   }
   function check_mail_address($mail_address) {
       $pattern = "/^[\w-]+(\.[\w-]+)*@([0-9a-z][0-9a-z-]*[0-9a-z]\.)+([a-z]{2,4})$/i";
       if (preg_match($pattern, $mail_address)) {
           if (function_exists("checkdnsrr")) {
               $parts = explode("@", $mail_address);
               if (checkdnsrr($parts[1], "MX")){
                   return true;
               } else {
                   return false;
               }
           } else {
               // on windows hosts is only a limited e-mail address validation possible
               return true;
           }
       } else {
           return false;
       }
   }
   function create_mime_boundry() {
       $this->uid = "_".md5(uniqid(time()));
   }
   function get_file_data($filepath) {
       if (file_exists($filepath)) {
           if (!$str = file_get_contents($filepath)) {
               $this->msg[] = "Error while opening attachment \"".basename($filepath)."\"";
           } else {
               return $str;
           }
       } else {
           $this->msg[] = "Error, the file \"".basename($filepath)."\" does not exist.";
           return;
       }
   }
   // remember "LIBR" is the line break defined in constact above
   function create_msg_body($mail_msg, $cont_tranf_enc = "7bit", $type = "text/plain", $enc = "iso-8859-1") {
       $str = "--".$this->uid.LIBR;
       $str .= "Content-type:".$type."; charset=".$enc.LIBR;
       $str .= "Content-Transfer-Encoding: ".$cont_tranf_enc.LIBR.LIBR;
       $str .= trim($mail_msg).LIBR.LIBR;
       return $str;
   }
   function create_mail_headers() {
       if ($this->from_name != "") {
           $headers = "From: ".$this->from_name." <".$this->from_mail.">".LIBR;
           $headers .= "Reply-To: ".$this->from_name." <".$this->from_mail.">".LIBR;
       } else {
           $headers = "From: ".$this->from_mail.LIBR;
           $headers .= "Reply-To: ".$this->from_mail.LIBR;
       }
       if ($this->mail_cc != "") $headers .= "Cc: ".$this->mail_cc.LIBR;
       if ($this->mail_bcc != "") $headers .= "Bcc: ".$this->mail_bcc.LIBR;
       $headers .= "MIME-Version: 1.0".LIBR;
       $headers .= "X-Mailer: Attachment Mailer ver. 1.0".LIBR;
       $headers .= "X-Priority: ".$this->mail_priority.LIBR;
       $headers .= "Content-Type: multipart/mixed;".LIBR.chr(9)." boundary=\"".$this->uid."\"".LIBR.LIBR;
       $headers .= "This is a multi-part message in MIME format.".LIBR.LIBR;
       return $headers;
   }
   // use for $dispo "attachment" or "inline" (f.e. example images inside a html mail
   function create_attachment_part($file, $dispo = "attachment") {
       if (!$this->valid_mail_adresses) return;
       $file_str = $this->get_file_data($file);
       if ($file_str == "") {
           return;
       } else {
           $filename = basename($file);
           $file_type = mime_content_type($file);
           $chunks = chunk_split(base64_encode($file_str));
           $mail_part = "--".$this->uid.LIBR;
           $mail_part .= "Content-type:".$file_type.";".LIBR.chr(9)." name=\"".$filename."\"".LIBR;
           $mail_part .= "Content-Transfer-Encoding: base64".LIBR;
           $mail_part .= "Content-Disposition: ".$dispo.";".chr(9)."filename=\"".$filename."\"".LIBR.LIBR;
           $mail_part .= $chunks;
           $mail_part .= LIBR.LIBR;
           $this->att_files[] = $mail_part;
       }             
   }
   function process_mail() {
       if (!$this->valid_mail_adresses) return;
       $mail_message = $this->mail_body;
       if (count($this->att_files) > 0) {
           foreach ($this->att_files as $val) {
               $mail_message .= $val;
           }
           $mail_message .= "--".$this->uid."--";
       }
       if (mail($this->mail_to, $this->mail_subject, $mail_message, $this->mail_headers)) {
           $this->msg[] = "Your mail is succesfully submitted.";
       } else {
           $this->msg[] = "Error while sending you mail.";
       }
   }
}
   
?>