添加邮件发送

+package goemail
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"net/smtp"
+	"strings"
+	"time"
+)
+
+type EmailHeader struct {
+	Key   string
+	Value string
+}
+
+type EmailMessage struct {
+	FromEmail       string        //发件人邮箱地址
+	Header          []EmailHeader //TODO
+	Toers           []string      //邮件接收人，如有多个，则以英文逗号(“,”)隔开，不能为空
+	Subject         string        //主题
+	BodyContentType string
+	Body            []byte //内容
+	//TODO	Copyers    []string //邮件抄送人，如有多个，则以英文逗号(“,”)隔开，不能为空
+	//TODO附加
+}
+
+func (e *EmailMessage) AddToer(v string) {
+	e.Toers = append(e.Toers, v)
+}
+
+func (e *EmailMessage) SetBody(v []byte) {
+	e.Body = v
+}
+func (e *EmailMessage) Bytes() []byte {
+	buf := bytes.NewBuffer(nil)
+	buf.WriteString(fmt.Sprintf("From:%s \r\n", e.FromEmail))
+	t := time.Now().Format(time.RFC1123Z)
+	buf.WriteString(fmt.Sprintf("Date:%s \r\n", t))
+	buf.WriteString(fmt.Sprintf("To:%s \r\n", strings.Join(e.Toers, ",")))
+	var subject = "=?UTF-8?B?" + base64.StdEncoding.EncodeToString([]byte(e.Subject)) + "?="
+	buf.WriteString("Subject: " + subject + "\r\n")
+	buf.WriteString("MIME-Version: 1.0\r\n")
+	//TODO 添加header
+	boundary := "THIS_IS_BOUNDARY"
+	buf.WriteString("Content-Type: multipart/mixed; boundary=" + boundary + "\r\n")
+	buf.WriteString("\r\n--" + boundary + "\r\n")
+	buf.WriteString(fmt.Sprintf("Content-Type: %s; charset=utf-8\r\n\r\n", e.BodyContentType))
+	buf.Write(e.Body)
+	buf.WriteString("\r\n")
+	buf.WriteString("--" + boundary + "--")
+	//TODO添加附件
+	return buf.Bytes()
+}
+
+// func (e *EmailMessage) To() []string {
+// 	return e.Toers
+// }
+func NewHtmlEmail() *EmailMessage {
+	return nil
+}
+
+func (e *EmailMessage) AddHeader(key string, value string) EmailHeader {
+	newHeader := EmailHeader{Key: key, Value: value}
+	e.Header = append(e.Header, newHeader)
+	return newHeader
+}
+
+// ServerHost      string        //邮箱服务器地址
+// ServerPort      int           //邮箱服务器的端口
+// FromPasswd      string        //发件人邮箱密码
+func NewSmtpAuth(fromEmail string, pwd string, host string) smtp.Auth {
+	return smtp.PlainAuth("", fromEmail, pwd, host)
+}
+func Send(addr string, auth smtp.Auth, m *EmailMessage) error {
+	return smtp.SendMail(addr, auth, m.FromEmail, m.Toers, m.Bytes())
+}