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gosmail.go
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gosmail.go
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// mgosmail is a text/html/attachments mail Sender for human.
package gosmail
import (
"bytes"
"encoding/base64"
"fmt"
"mime/multipart"
"net/mail"
"net/smtp"
"net/textproto"
"strings"
"time"
)
//Mail a mail for send
type Mail struct {
From mail.Address // from mail, must be the same with auth
To []string // the mail send to
Cc []string // the cc may be empty.
Bcc []string // the same with cc
ReplyTo string
Subject string // the mail Subject
Body string // the text mail body, may be empty
HTMLBody string // the html mail body, may be empty
Attachments []*Attachment //the Attachments include inline attachment
}
func (m *Mail) writeHeaHer(buf *bytes.Buffer) {
// from
buf.WriteString("From: " + m.From.String() + "\r\n")
//date
t := time.Now()
buf.WriteString("Date: " + t.Format(time.RFC1123Z) + "\r\n")
// to
m.To = append(m.To, m.Cc...)
m.To = append(m.To, m.Bcc...)
buf.WriteString("To: " + strings.Join(m.To, ",") + "\r\n")
//cc
if len(m.Cc) > 0 {
buf.WriteString("CC: " + strings.Join(m.Cc, ",") + "\r\n")
}
//bcc
if len(m.Bcc) > 0 {
buf.WriteString("Bcc: " + strings.Join(m.Bcc, ",") + "\r\n")
}
//Subject
buf.WriteString("Subject: " + m.Subject + "\r\n")
//Reply
if len(m.ReplyTo) > 0 {
buf.WriteString("Reply-To: " + m.ReplyTo + "\r\n")
}
}
func (m *Mail) writerBody(buf *bytes.Buffer, mixed *multipart.Writer) {
part := multipart.NewWriter(buf)
defer part.Close()
alt := make(textproto.MIMEHeader, 1)
c := fmt.Sprintf("multipart/alternative; \r\n\tboundary=\"%s\"", part.Boundary())
alt.Add("Content-Type", c)
mixed.CreatePart(alt)
write := func(c, t string) {
ct := fmt.Sprintf("%s; charset=UTF-8", c)
h := textproto.MIMEHeader{"Content-Type": []string{ct}}
w, _ := part.CreatePart(h)
w.Write([]byte(t))
}
write("text/plain", m.Body)
write("text/html", m.HTMLBody)
}
func (m *Mail) toBytes() []byte {
buf := bytes.NewBuffer(nil)
//writeHeaHer
m.writeHeaHer(buf)
// Start our multipart/mixed part
mixed := multipart.NewWriter(buf)
defer mixed.Close()
fmt.Fprintf(buf, "Content-Type: multipart/mixed;\r\n\tboundary=\"%s\"; charset=UTF-8\r\n\r\n", mixed.Boundary())
m.writerBody(buf, mixed)
// writer Attachments
for _, attachment := range m.Attachments {
w, _ := mixed.CreatePart(attachment.getMIMEHeader())
b := make([]byte, base64.StdEncoding.EncodedLen(len(attachment.Data)))
base64.StdEncoding.Encode(b, attachment.Data)
w.Write(b)
}
return buf.Bytes()
}
//Attachment the attachment
type Attachment struct {
IsInline bool
FileName string
ContentType string
Data []byte
}
func (a *Attachment) getMIMEHeader() textproto.MIMEHeader {
header := make(textproto.MIMEHeader, 1)
header.Add("Content-Transfer-Encoding", "base64")
header.Add("Content-Type", a.ContentType)
if a.IsInline {
disp := fmt.Sprintf("inline;\n\tfilename=%s", a.FileName)
header.Add("Content-Disposition", disp)
} else {
disp := fmt.Sprintf("attachment; filename=%s", a.FileName)
cid := fmt.Sprintf("<%s>", a.FileName)
header.Add("Content-Disposition", disp)
header.Add("cid", cid)
}
return header
}
//Client the smtp client
type Client struct {
auth smtp.Auth
hostname string
port string
}
//Send send mail
func (c *Client) Send(mail *Mail) {
err := smtp.SendMail(c.hostname+c.port, c.auth, mail.From.Address, mail.To, mail.toBytes())
if err != nil {
panic(err)
}
}
//NewClient return a new smtp client with auth plain
func NewClient(hostname, port, user, pwd string) *Client {
c := new(Client)
c.hostname = hostname
c.port = port
c.auth = smtp.PlainAuth("", user, pwd, hostname)
return c
}