2023-12-27 18:16:21 +08:00
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package mailx
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import (
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"bytes"
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"encoding/base64"
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"fmt"
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"net/smtp"
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"os"
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"path"
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"strings"
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"time"
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)
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// 邮件发送的封装
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// 1. 支持文本
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// 2. 支持文件
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type Mailx struct {
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user string
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password string
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host string
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port string
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auth smtp.Auth
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}
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type Attachment struct {
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Name string
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ContentType string
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WithFile bool
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}
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type Message struct {
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2024-08-23 15:09:37 +08:00
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Form string
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2023-12-27 18:16:21 +08:00
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To []string
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Cc []string
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Bcc []string
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Subject string
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Body string
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// ContentType string
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ReplyTo string
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Attachment []Attachment
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}
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func NewMailx(user, password, host, port string) *Mailx {
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m := &Mailx{
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user: user,
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password: password,
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host: host,
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port: port,
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}
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m.auth = smtp.PlainAuth("", user, password, host)
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return m
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}
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func (m *Mailx) Send(message Message) error {
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// .Auth()
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buffer := bytes.NewBuffer(nil)
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boundary := "YunBoundaryYun"
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Header := make(map[string]string)
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// Header["From"] = "BOP<" + message.Form + ">"
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Header["From"] = m.user
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if len(message.To) > 0 {
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str := ""
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for _, val := range message.To {
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name := ""
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s := strings.Split(val, "@")
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if len(s) > 0 {
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name = s[0]
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}
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str = str + "," + name + "<" + val + ">"
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}
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Header["To"] = strings.Trim(str, ",")
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// Header["To"] = strings.Join(message.To, ",")
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}
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if len(message.Cc) > 0 {
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str := ""
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for _, val := range message.Cc {
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name := ""
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s := strings.Split(val, "@")
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if len(s) > 0 {
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name = s[0]
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}
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str = str + "," + name + "<" + val + ">"
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}
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Header["Cc"] = strings.Trim(str, ",")
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// Header["Cc"] = strings.Join(message.Cc, ",")
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}
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if len(message.Bcc) > 0 {
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str := ""
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for _, val := range message.Bcc {
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name := ""
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s := strings.Split(val, "@")
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if len(s) > 0 {
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name = s[0]
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}
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str = str + "," + name + "<" + val + ">"
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}
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Header["Bcc"] = strings.Trim(str, ",")
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// Header["Bcc"] = strings.Join(message.Bcc, ",")
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}
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Header["Subject"] = message.Subject
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Header["Content-Type"] = "multipart/mixed; charset=UTF-8; boundary=" + boundary
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Header["Date"] = time.Now().String()
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Header["Reply-To"] = message.ReplyTo
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Header["X-Priority"] = "3"
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m.writeHeader(buffer, Header)
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body := "--" + boundary + "\r\n"
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// body += "Content-Type: text/plain; charset=UTF-8 \r\n"
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body += "Content-Type: text/html;charset=utf-8\r\n"
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body += "Content-Transfer-Encoding:quoted-printable\r\n\r\n"
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// body += "<html><body><h1>huang</h1><h2>xin</h2></body></html>\r\n"
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body += "<html><body>" + message.Body + "</body></html>\r\n"
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// body += "--" + boundary + "--\r\n\r\n"
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buffer.WriteString(body)
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for _, value := range message.Attachment {
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newBuf := bytes.NewBuffer(nil)
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err := m.writeFile(newBuf, value.Name)
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if err != nil {
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fmt.Println("file err:", err)
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continue
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}
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f_name := path.Base(value.Name)
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attachment := "--" + boundary + "\r\n"
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attachment += "Content-Transfer-Encoding:base64\r\n"
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attachment += "Content-Disposition:attachment;filename=" + f_name + "\r\n"
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attachment += "Content-Type: application/octet-stream;charset=utf-8;name=" + f_name + "\r\n"
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// attachment += "Contment-Type:" + message.attachment.contentType + ";name=\"" + message.attachment.name + "\"\r\n"
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buffer.WriteString(attachment)
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buffer.WriteString(newBuf.String())
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}
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2024-08-23 15:09:37 +08:00
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if message.Form == "" {
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message.Form = m.user
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}
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2023-12-27 18:16:21 +08:00
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buffer.WriteString("\r\n--" + boundary + "--\r\n")
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b := buffer.Bytes()
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2024-08-23 15:09:37 +08:00
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err := smtp.SendMail(m.host+":"+m.port, m.auth, message.Form, message.To, b)
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2023-12-27 18:16:21 +08:00
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fmt.Println("发送结束：", err)
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fmt.Println(string(b))
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return err
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}
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// 格式化header
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func (m *Mailx) writeHeader(buffer *bytes.Buffer, Header map[string]string) string {
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header := ""
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// header := "Content-Type: multipart/mixed;charset=UTF-8;boundary=\"YunBoundaryYun\" \r\n"
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for key, value := range Header {
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if value != "" {
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header += key + ": " + value + "\r\n"
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}
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}
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header += "\r\n"
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buffer.WriteString(header)
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return header
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}
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// 格式化文件
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func (m *Mailx) writeFile(buffer *bytes.Buffer, fileName string) error {
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file, err := os.ReadFile(fileName)
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if err != nil {
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return err
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}
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payload := make([]byte, base64.StdEncoding.EncodedLen(len(file)))
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base64.StdEncoding.Encode(payload, file)
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buffer.WriteString("\r\n")
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for index, line := 0, len(payload); index < line; index++ {
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buffer.WriteByte(payload[index])
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if (index+1)%76 == 0 {
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buffer.WriteString("\r\n")
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}
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}
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return nil
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}
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