/**
 * 邮件发送类
 * 支持发送纯文本邮件和 HTML 格式的邮件，可以多收件人，多抄送，多秘密抄送，带附件(单个或多个附件),支持到服务器的 ssl 连接
 * 需要的 php 扩展：sockets、Fileinfo 和 openssl。
 * 编码格式是 UTF-8，传输编码格式是 base64
 * @example
 * $mail = new MySendMail();
 * $mail->setServer("smtp@126.com", "XXXXX@126.com", "XXXXX"); //设置 smtp 服务器，普通连接方式
 * $mail->setServer("smtp.gmail.com", "XXXXX@gmail.com", "XXXXX", 465, true); //设置 smtp 服务器，到服务器的 SSL 连接
 * $mail->setFrom("XXXXX"); //设置发件人
 * $mail->setReceiver("XXXXX"); //设置收件人，多个收件人，调用多次
 * $mail->setCc("XXXX"); //设置抄送，多个抄送，调用多次
 * $mail->setBcc("XXXXX"); //设置秘密抄送，多个秘密抄送，调用多次
 * $mail->addAttachment("XXXX"); //添加附件，多个附件，调用多次
 * $mail->setMail("test", "<b>test</b>"); //设置邮件主题、内容
 * $mail->sendMail(); //发送
 */
class MySendMail {
    /**
     * @var string 邮件传输代理用户名
     * @access protected
     */
    protected $_userName;
    /**
     * @var string 邮件传输代理密码
     * @access protected
     */
    protected $_password;
    /**
     * @var string 邮件传输代理服务器地址
     * @access protected
     */
    protected $_sendServer;
    /**
     * @var int 邮件传输代理服务器端口
     * @access protected
     */
    protected $_port;
    /**
     * @var string 发件人
     * @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 主题
     * @access protected
     */
    protected $_subject;
    /**
     * @var string 邮件正文
     * @access protected
     */
    protected $_body;
    /**
     * @var array 附件
     * @access protected
     */
    protected $_attachment = array();
    /**
     * @var reource socket 资源
     * @access protected
     */
    protected $_socket;
    /**
     * @var reource 是否是安全连接
     * @access protected
     */
    protected $_isSecurity;
    /**
     * @var string 错误信息
     * @access protected
     */
    protected $_errorMessage;
    /**
     * 设置邮件传输代理，如果是可以匿名发送有邮件的服务器，只需传递代理服务器地址就行
     * @access public
     * @param string $server 代理服务器的 ip 或者域名
     * @param string $username 认证账号
     * @param string $password 认证密码
     * @param int $port 代理服务器的端口，smtp 默认 25 号端口
     * @param boolean $isSecurity 到服务器的连接是否为安全连接，默认 false
     * @return boolean
     */
    public function setServer($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;
    }
    /**
     * 设置发件人
     * @access public
     * @param string $from 发件人地址
     * @return boolean
     */
    public function setFrom($from) {
        $this->_from = $from;
        return true;
    }
    /**
     * 设置收件人，多个收件人，调用多次.
     * @access public
     * @param string $to 收件人地址
     * @return boolean
     */
    public function setReceiver($to) {
        $this->_to[] = $to;
        return true;
    }
    /**
     * 设置抄送，多个抄送，调用多次.
     * @access public
     * @param string $cc 抄送地址
     * @return boolean
     */
    public function setCc($cc) {
        $this->_cc[] = $cc;
        return true;
    }
    /**
     * 设置秘密抄送，多个秘密抄送，调用多次
     * @access public
     * @param string $bcc 秘密抄送地址
     * @return boolean
     */
    public function setBcc($bcc) {
        $this->_bcc[] = $bcc;
        return true;
    }
    /**
     * 设置邮件附件，多个附件，调用多次
     * @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;
    }
    /**
     * 设置邮件信息
     * @access public
     * @param string $body 邮件主题
     * @param string $subject 邮件主体内容，可以是纯文本，也可是是 HTML 文本
     * @return boolean
     */
    public function setMail($subject, $body) {
        $this->_subject = base64_encode($subject);
        $this->_body = base64_encode($body);
        return true;
    }
    /**
     * 发送邮件
     * @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;
            }
        }
        //其实这里也没必要关闭，smtp 命令：QUIT 发出之后，服务器就关闭了连接，本地的 socket 资源会自动释放
        $this->_isSecurity ? $this->closeSecutity() : $this->close();
        return true;
    }
    /**
     * 返回错误信息
     * @return string
     */
    public function error() {
        if (!isset($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);
        }
        //设置发件人
        $command[] = array("MAIL FROM: <" . $this->_from . ">\r\n", 250);
        $header = "FROM: <" . $this->_from . ">\r\n";
        //设置收件人
        if (!empty($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] . ">";
                    }
                }
            }
        }
        //设置抄送
        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] . ">";
                    }
                }
            }
        }
        //设置秘密抄送
        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] . ">";
                    }
                }
            }
        }
        //主题
        $header .= "Subject: =?UTF-8?B?" . $this->_subject . "?=\r\n";
        if (isset($this->_attachment)) {
            //含有附件的邮件头需要声明成这个
            $header .= "Content-Type: multipart/mixed;\r\n";
        } elseif (false) {
            //邮件体含有图片资源的,且包含的图片在邮件内部时声明成这个，如果是引用的远程图片，就不需要了
            $header .= "Content-Type: multipart/related;\r\n";
        } else {
            //html 或者纯文本的邮件声明成这个
            $header .= "Content-Type: multipart/alternative;\r\n";
        }
        //邮件头分隔符
        $header .= "\t" . 'boundary="' . $separator . '"';
        $header .= "\r\nMIME-Version: 1.0\r\n";
        //这里开始是邮件的 body 部分，body 部分分成几段发送
        $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";
            }
        }
        //结束邮件数据发送
        $header .= "\r\n.\r\n";

        $command[] = array("DATA\r\n", 354);
        $command[] = array($header, 250);
        $command[] = array("QUIT\r\n", 221);
        return $command;
    }
    /**
     * 发送命令
     * @access protected
     * @param string $command 发送到服务器的 smtp 命令
     * @param int $code 期望服务器返回的响应吗
     * @return boolean
     */
    protected function sendCommand($command, $code) {
        echo 'Send command:' . $command . ',expected code:' . $code . '<br />';
        //发送命令给服务器
        try {
            if (socket_write($this->_socket, $command, strlen($command))) {
                //当邮件内容分多次发送时，没有$code，服务器没有返回
                if (empty($code)) {
                    return true;
                }
                //读取服务器返回
                $data = trim(socket_read($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();
        }
    }
    /**
     * 安全连接发送命令
     * @access protected
     * @param string $command 发送到服务器的 smtp 命令
     * @param int $code 期望服务器返回的响应吗
     * @return boolean
     */
    protected function sendCommandSecurity($command, $code) {
        //echo 'Send command:' . $command . ',expected code:' . $code . '<br />';
        try {
            if (fwrite($this->_socket, $command)) {
                //当邮件内容分多次发送时，没有$code，服务器没有返回
                if (empty($code)) {
                    return true;
                }
                //读取服务器返回
                $data = trim(fread($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();
        }
    }
    /**
     * 读取附件文件内容，返回 base64 编码后的文件内容
     * @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;
        }
    }
    /**
     * 获取附件 MIME 类型
     * @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;
        }
    }
    /**
     * 建立到服务器的网络连接
     * @access protected
     * @return boolean
     */
    protected function socket() {
        //创建 socket 资源
        $this->_socket = socket_create(AF_INET, SOCK_STREAM, getprotobyname('tcp'));
        if (!$this->_socket) {
            $this->_errorMessage = socket_strerror(socket_last_error());
            return false;
        }
        socket_set_block($this->_socket); //设置阻塞模式
        //连接服务器
        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;
    }
    /**
     * 建立到服务器的 SSL 网络连接
     * @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 = $errstr;
            return false;
        }
        //设置加密连接，默认是 ssl，如果需要 tls 连接，可以查看 php 手册 stream_socket_enable_crypto 函数的解释
        stream_socket_enable_crypto($this->_socket, true, STREAM_CRYPTO_METHOD_SSLv23_CLIENT);
        stream_set_blocking($this->_socket, 1); //设置阻塞模式
        $str = fread($this->_socket, 1024);
        if (!preg_match("/220+?/", $str)) {
            $this->_errorMessage = $str;
            return false;
        }
        return true;
    }
    /**
     * 关闭 socket
     * @access protected
     * @return boolean
     */
    protected function close() {
        if (isset($this->_socket) && is_object($this->_socket)) {
            $this->_socket->close();
            return true;
        }
        $this->_errorMessage = "No resource can to be close";
        return false;
    }
    /**
     * 关闭安全 socket
     * @access protected
     * @return boolean
     */
    protected function closeSecutity() {
        if (isset($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;
    }
}