<?php
/**
* 郵件發送類
* 支持發送純文本郵件和HTML格式的郵件，可以多收件人，多抄送，多秘密抄送，帶附件(單個或多個附件),支持到服務器的ssl連接
* 需要的php擴展：sockets、Fileinfo和openssl。
* 編碼格式是UTF-8，傳輸編碼格式是base64
* @example
* $mail = new MySendMail();
* $mail->setServer("smtp@126.com", "XXXXX@126.com", "XXXXX"); //設置smtp服務器，普通連接方式
* $mail->setServer("smtp.gmail.com", "XXXXX@gmail.com", "XXXXX", 465, true); //設置smtp服務器，到服務器的SSL連接
* $mail->setFrom("XXXXX"); //設置發件人
* $mail->setReceiver("XXXXX"); //設置收件人，多個收件人，調用多次
* $mail->setCc("XXXX"); //設置抄送，多個抄送，調用多次
* $mail->setBcc("XXXXX"); //設置秘密抄送，多個秘密抄送，調用多次
* $mail->addAttachment("XXXX"); //添加附件，多個附件，調用多次
* $mail->setMail("test", "<b>test</b>"); //設置郵件主題、內容
* $mail->sendMail(); //發送
*/
class MySendMail {
    /**
    * @var string 郵件傳輸代理用戶名
    * @access protected
    */
    protected $_userName;
    /**
    * @var string 郵件傳輸代理密碼
    * @access protected
    */
    protected $_password;
    /**
    * @var string 郵件傳輸代理服務器地址
    * @access protected
    */
    protected $_sendServer;
    /**
    * @var int 郵件傳輸代理服務器端口
    * @access protected
    */
    protected $_port;
    /**
    * @var string 發件人
    * @access protected
    */
    protected $_from;
    /**
    * @var array 收件人
    * @access protected
    */
    protected $_to = array();
    /**
    * @var array 抄送
    * @access protected
    */
    protected $_cc = array();
    /**
    * @var array 秘密抄送
    * @access protected
    */
    protected $_bcc = array();
    /**
    * @var string 主題
    * @access protected
    */
    protected $_subject;
    /**
    * @var string 郵件正文
    * @access protected
    */
    protected $_body;
    /**
    * @var array 附件
    * @access protected
    */
    protected $_attachment = array();
    /**
    * @var reource socket資源
    * @access protected
    */
    protected $_socket;
    /**
    * @var reource 是否是安全連接
    * @access protected
    */
    protected $_isSecurity;
    /**
    * @var string 錯誤信息
    * @access protected
    */
    protected $_errorMessage;
    /**
    * 設置郵件傳輸代理，如果是可以匿名發送有郵件的服務器，只需傳遞代理服務器地址就行
    * @access public
    * @param string $server 代理服務器的ip或者域名
    * @param string $username 認證賬號
    * @param string $password 認證密碼
    * @param int $port 代理服務器的端口，smtp默認25號端口
    * @param boolean $isSecurity 到服務器的連接是否為安全連接，默認false
    * @return boolean
    */
    public function setServer($server, $username="", $password="", $port=25, $isSecurity=false) {
        $this->_sendServer = $server;
        $this->_port = $port;
        $this->_isSecurity = $isSecurity;
        $this->_userName = empty($username) ? "" : base64_encode($username);
        $this->_password = empty($password) ? "" : base64_encode($password);
        return true;
    }
    /**
    * 設置發件人
    * @access public
    * @param string $from 發件人地址
    * @return boolean
    */
    public function setFrom($from) {
        $this->_from = $from;
        return true;
    }
    /**
    * 設置收件人，多個收件人，調用多次.
    * @access public
    * @param string $to 收件人地址
    * @return boolean
    */
    public function setReceiver($to) {
        $this->_to[] = $to;
        return true;
    }
    /**
    * 設置抄送，多個抄送，調用多次.
    * @access public
    * @param string $cc 抄送地址
    * @return boolean
    */
    public function setCc($cc) {
        $this->_cc[] = $cc;
        return true;
    }
    /**
    * 設置秘密抄送，多個秘密抄送，調用多次
    * @access public
    * @param string $bcc 秘密抄送地址
    * @return boolean
    */
    public function setBcc($bcc) {
        $this->_bcc[] = $bcc;
        return true;
    }
    /**
    * 設置郵件附件，多個附件，調用多次
    * @access public
    * @param string $file 文件地址
    * @return boolean
    */
    public function addAttachment($file) {
        if(!file_exists($file)) {
            $this->_errorMessage = "file " . $file . " does not exist.";
            return false;
        }
        $this->_attachment[] = $file;
        return true;
    }
    /**
    * 設置郵件信息
    * @access public
    * @param string $body 郵件主題
    * @param string $subject 郵件主體內容，可以是純文本，也可是是HTML文本
    * @return boolean
    */
    public function setMail($subject, $body) {
        $this->_subject = base64_encode($subject);
        $this->_body = base64_encode($body);
        return true;
    }
    /**
    * 發送郵件
    * @access public
    * @return boolean
    */
    public function sendMail() {
        $command = $this->getCommand();
        $this->_isSecurity ? $this->socketSecurity() : $this->socket();
        foreach ($command as $value) {
            $result = $this->_isSecurity ? $this->sendCommandSecurity($value[0], $value[1]) : $this->sendCommand($value[0], $value[1]);
            if($result) {
                continue;
            }
            else{
                return false;
            }
        }
        //其實這里也沒必要關閉，smtp命令：QUIT發出之后，服務器就關閉了連接，本地的socket資源會自動釋放
        $this->_isSecurity ? $this->closeSecutity() : $this->close();
        return true;
    }
    /**
    * 返回錯誤信息
    * @return string
    */
    public function error(){
        if(!isset($this->_errorMessage)) {
            $this->_errorMessage = "";
        }
        return $this->_errorMessage;
    }
    /**
    * 返回mail命令
    * @access protected
    * @return array
    */
    protected function getCommand() {
        $separator = "----=_Part_" . md5($this->_from . time()) . uniqid(); //分隔符
        $command = array(
                array("HELO sendmail/r/n", 250)
            );
        if(!empty($this->_userName)){
            $command[] = array("AUTH LOGIN/r/n", 334);
            $command[] = array($this->_userName . "/r/n", 334);
            $command[] = array($this->_password . "/r/n", 235);
        }
        //設置發件人
        $command[] = array("MAIL FROM: <" . $this->_from . ">/r/n", 250);
        $header = "FROM: <" . $this->_from . ">/r/n";
        //設置收件人
        if(!empty($this->_to)) {
            $count = count($this->_to);
            if($count == 1){
                $command[] = array("RCPT TO: <" . $this->_to[0] . ">/r/n", 250);
                $header .= "TO: <" . $this->_to[0] .">/r/n";
            }
            else{
                for($i=0; $i<$count; $i++){
                    $command[] = array("RCPT TO: <" . $this->_to[$i] . ">/r/n", 250);
                    if($i == 0){
                        $header .= "TO: <" . $this->_to[$i] .">";
                    }
                    elseif($i + 1 == $count){
                        $header .= ",<" . $this->_to[$i] .">/r/n";
                    }
                    else{
                        $header .= ",<" . $this->_to[$i] .">";
                    }
                }
            }
        }
        //設置抄送
        if(!empty($this->_cc)) {
            $count = count($this->_cc);
            if($count == 1){
                $command[] = array("RCPT TO: <" . $this->_cc[0] . ">/r/n", 250);
                $header .= "CC: <" . $this->_cc[0] .">/r/n";
            }
            else{
                for($i=0; $i<$count; $i++){
                    $command[] = array("RCPT TO: <" . $this->_cc[$i] . ">/r/n", 250);
                    if($i == 0){
                    $header .= "CC: <" . $this->_cc[$i] .">";
                    }
                    elseif($i + 1 == $count){
                        $header .= ",<" . $this->_cc[$i] .">/r/n";
                    }
                    else{
                        $header .= ",<" . $this->_cc[$i] .">";
                    }
                }
            }
        }
        //設置秘密抄送
        if(!empty($this->_bcc)) {
            $count = count($this->_bcc);
            if($count == 1) {
                $command[] = array("RCPT TO: <" . $this->_bcc[0] . ">/r/n", 250);
                $header .= "BCC: <" . $this->_bcc[0] .">/r/n";
            }
            else{
                for($i=0; $i<$count; $i++){
                    $command[] = array("RCPT TO: <" . $this->_bcc[$i] . ">/r/n", 250);
                    if($i == 0){
                    $header .= "BCC: <" . $this->_bcc[$i] .">";
                    }
                    elseif($i + 1 == $count){
                        $header .= ",<" . $this->_bcc[$i] .">/r/n";
                    }
                    else{
                        $header .= ",<" . $this->_bcc[$i] .">";
                    }
                }
            }
        }
        //主題
        $header .= "Subject: =?UTF-8?B?" . $this->_subject ."?=/r/n";
        if(isset($this->_attachment)) {
            //含有附件的郵件頭需要聲明成這個
            $header .= "Content-Type: multipart/mixed;/r/n";
        }
        elseif(false){
            //郵件體含有圖片資源的,且包含的圖片在郵件內部時聲明成這個，如果是引用的遠程圖片，就不需要了
            $header .= "Content-Type: multipart/related;/r/n";
        }
        else{
            //html或者純文本的郵件聲明成這個
            $header .= "Content-Type: multipart/alternative;/r/n";
        }
        //郵件頭分隔符
        $header .= "/t" . 'boundary="' . $separator . '"';
        $header .= "/r/nMIME-Version: 1.0/r/n";
        //這里開始是郵件的body部分，body部分分成幾段發送
        $header .= "/r/n--" . $separator . "/r/n";
        $header .= "Content-Type:text/html; charset=utf-8/r/n";
        $header .= "Content-Transfer-Encoding: base64/r/n/r/n";
        $header .= $this->_body . "/r/n";
        $header .= "--" . $separator . "/r/n";
        //加入附件
        if(!empty($this->_attachment)){
            $count = count($this->_attachment);
            for($i=0; $i<$count; $i++){
                $header .= "/r/n--" . $separator . "/r/n";
                $header .= "Content-Type: " . $this->getMIMEType($this->_attachment[$i]) . '; name="=?UTF-8?B?' . base64_encode( basename($this->_attachment[$i]) ) . '?="' . "/r/n";
                $header .= "Content-Transfer-Encoding: base64/r/n";
                $header .= 'Content-Disposition: attachment; filename="=?UTF-8?B?' . base64_encode( basename($this->_attachment[$i]) ) . '?="' . "/r/n";
                $header .= "/r/n";
                $header .= $this->readFile($this->_attachment[$i]);
                $header .= "/r/n--" . $separator . "/r/n";
            }
        }
        //結束郵件數據發送
        $header .= "/r/n./r/n";
 
        $command[] = array("DATA/r/n", 354);
        $command[] = array($header, 250);
        $command[] = array("QUIT/r/n", 221);
        return $command;
    }
    /**
    * 發送命令
    * @access protected
    * @param string $command 發送到服務器的smtp命令
    * @param int $code 期望服務器返回的響應嗎
    * @return boolean
    */
    protected function sendCommand($command, $code) {
        echo 'Send command:' . $command . ',expected code:' . $code . '<br />';
        //發送命令給服務器
        try{
            if(socket_write($this->_socket, $command, strlen($command))){
                //當郵件內容分多次發送時，沒有$code，服務器沒有返回
                if(empty($code))  {
                    return true;
                }
                //讀取服務器返回
                $data = trim(socket_read($this->_socket, 1024));
                echo 'response:' . $data . '<br /><br />';
                if($data) {
                    $pattern = "/^".$code."+?/";
                    if(preg_match($pattern, $data)) {
                        return true;
                    }
                    else{
                        $this->_errorMessage = "Error:" . $data . "|**| command:";
                        return false;
                    }
                }
                else{
                    $this->_errorMessage = "Error:" . socket_strerror(socket_last_error());
                    return false;
                }
            }
            else{
                $this->_errorMessage = "Error:" . socket_strerror(socket_last_error());
                return false;
            }
        }catch(Exception $e) {
            $this->_errorMessage = "Error:" . $e->getMessage();
        }
    }
    /**
    * 安全連接發送命令
    * @access protected
    * @param string $command 發送到服務器的smtp命令
    * @param int $code 期望服務器返回的響應嗎
    * @return boolean
    */
    protected function sendCommandSecurity($command, $code) {
        echo 'Send command:' . $command . ',expected code:' . $code . '<br />';
        try {
            if(fwrite($this->_socket, $command)){
                //當郵件內容分多次發送時，沒有$code，服務器沒有返回
                if(empty($code))  {
                    return true;
                }
                //讀取服務器返回
                $data = trim(fread($this->_socket, 1024));
                echo 'response:' . $data . '<br /><br />';
                if($data) {
                    $pattern = "/^".$code."+?/";
                    if(preg_match($pattern, $data)) {
                        return true;
                    }
                    else{
                        $this->_errorMessage = "Error:" . $data . "|**| command:";
                        return false;
                    }
                }
                else{
                    return false;
                }
            }
            else{
                $this->_errorMessage = "Error: " . $command . " send failed";
                return false;
            }
        }catch(Exception $e) {
            $this->_errorMessage = "Error:" . $e->getMessage();
        }
    } 
    /**
    * 讀取附件文件內容，返回base64編碼后的文件內容
    * @access protected
    * @param string $file 文件
    * @return mixed
    */
    protected function readFile($file) {
        if(file_exists($file)) {
            $file_obj = file_get_contents($file);
            return base64_encode($file_obj);
        }
        else {
            $this->_errorMessage = "file " . $file . " dose not exist";
            return false;
        }
    }
    /**
    * 獲取附件MIME類型
    * @access protected
    * @param string $file 文件
    * @return mixed
    */
    protected function getMIMEType($file) {
        if(file_exists($file)) {
            $mime = mime_content_type($file);
            /*if(! preg_match("/gif|jpg|png|jpeg/", $mime)){
                $mime = "application/octet-stream";
            }*/
            return $mime;
        }
        else {
            return false;
        }
    }
    /**
    * 建立到服務器的網絡連接
    * @access protected
    * @return boolean
    */
    protected function socket() {
        //創建socket資源
        $this->_socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
        if(!$this->_socket) {
            $this->_errorMessage = socket_strerror(socket_last_error());
            return false;
        }
        socket_set_block($this->_socket);//設置阻塞模式
        //連接服務器
        if(!socket_connect($this->_socket, $this->_sendServer, $this->_port)) {
            $this->_errorMessage = socket_strerror(socket_last_error());
            return false;
        }
        $str = socket_read($this->_socket, 1024);
        if(!preg_match("/220+?/", $str)){
            $this->_errorMessage = $str;
            return false;
        }
        return true;
    }
    /**
    * 建立到服務器的SSL網絡連接
    * @access protected
    * @return boolean
    */
    protected function socketSecurity() {
        $remoteAddr = "tcp://" . $this->_sendServer . ":" . $this->_port;
        $this->_socket = stream_socket_client($remoteAddr, $errno, $errstr, 30);
        if(!$this->_socket){
            $this->_errorMessage = $errstr;
            return false;
        }
        //設置加密連接，默認是ssl，如果需要tls連接，可以查看php手冊stream_socket_enable_crypto函數的解釋
        stream_socket_enable_crypto($this->_socket, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
        stream_set_blocking($this->_socket, 1); //設置阻塞模式
        $str = fread($this->_socket, 1024);
        if(!preg_match("/220+?/", $str)){
            $this->_errorMessage = $str;
            return false;
        }
        return true;
    }
    /**
    * 關閉socket
    * @access protected
    * @return boolean
    */
    protected function close() {
        if(isset($this->_socket) && is_object($this->_socket)) {
            $this->_socket->close();
            return true;
        }
        $this->_errorMessage = "No resource can to be close";
        return false;
    }
    /**
    * 關閉安全socket
    * @access protected
    * @return boolean
    */
    protected function closeSecutity() {
        if(isset($this->_socket) && is_object($this->_socket)) {
            stream_socket_shutdown($this->_socket, STREAM_SHUT_WR);
            return true;
        }
        $this->_errorMessage = "No resource can to be close";
        return false;
    }
}