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support send mail
This commit is contained in:
astaxie
parent
aa2fef0d36
commit
d06c04277f
299
utils/mail.go
Normal file
299
utils/mail.go
Normal file
@ -0,0 +1,299 @@
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package utils
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import (
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"bytes"
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"encoding/base64"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"mime"
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"mime/multipart"
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"net/mail"
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"net/smtp"
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"net/textproto"
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"os"
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"path"
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"path/filepath"
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"strconv"
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"strings"
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)
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const (
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maxLineLength = 76
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)
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// Email is the type used for email messages
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type Email struct {
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Auth smtp.Auth
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Identity string `json:"identity"`
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Username string `json:"username"`
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Password string `json:"password"`
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Host string `json:"host"`
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Port int `json:"port"`
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From string `json:"from"`
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To []string
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Bcc []string
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Cc []string
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Subject string
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Text string // Plaintext message (optional)
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HTML string // Html message (optional)
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Headers textproto.MIMEHeader
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Attachments []*Attachment
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ReadReceipt []string
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}
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// Attachment is a struct representing an email attachment.
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// Based on the mime/multipart.FileHeader struct, Attachment contains the name, MIMEHeader, and content of the attachment in question
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type Attachment struct {
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Filename string
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Header textproto.MIMEHeader
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Content []byte
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}
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func NewEMail(config string) *Email {
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e := new(Email)
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e.Headers = textproto.MIMEHeader{}
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err := json.Unmarshal([]byte(config), e)
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if err != nil {
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return nil
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}
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if e.From == "" {
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e.From = e.Username
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}
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return e
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}
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// make all send information to byte
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func (e *Email) Bytes() ([]byte, error) {
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buff := &bytes.Buffer{}
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w := multipart.NewWriter(buff)
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// Set the appropriate headers (overwriting any conflicts)
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// Leave out Bcc (only included in envelope headers)
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e.Headers.Set("To", strings.Join(e.To, ","))
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if e.Cc != nil {
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e.Headers.Set("Cc", strings.Join(e.Cc, ","))
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}
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e.Headers.Set("From", e.From)
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e.Headers.Set("Subject", e.Subject)
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if len(e.ReadReceipt) != 0 {
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e.Headers.Set("Disposition-Notification-To", strings.Join(e.ReadReceipt, ","))
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}
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e.Headers.Set("MIME-Version", "1.0")
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e.Headers.Set("Content-Type", fmt.Sprintf("multipart/mixed;\r\n boundary=%s\r\n", w.Boundary()))
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// Write the envelope headers (including any custom headers)
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if err := headerToBytes(buff, e.Headers); err != nil {
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return nil, fmt.Errorf("Failed to render message headers: %s", err)
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}
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// Start the multipart/mixed part
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fmt.Fprintf(buff, "--%s\r\n", w.Boundary())
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header := textproto.MIMEHeader{}
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// Check to see if there is a Text or HTML field
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if e.Text != "" || e.HTML != "" {
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subWriter := multipart.NewWriter(buff)
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// Create the multipart alternative part
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header.Set("Content-Type", fmt.Sprintf("multipart/alternative;\r\n boundary=%s\r\n", subWriter.Boundary()))
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// Write the header
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if err := headerToBytes(buff, header); err != nil {
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return nil, fmt.Errorf("Failed to render multipart message headers: %s", err)
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}
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// Create the body sections
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if e.Text != "" {
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header.Set("Content-Type", fmt.Sprintf("text/plain; charset=UTF-8"))
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header.Set("Content-Transfer-Encoding", "quoted-printable")
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if _, err := subWriter.CreatePart(header); err != nil {
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return nil, err
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}
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// Write the text
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if err := quotePrintEncode(buff, e.Text); err != nil {
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return nil, err
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}
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}
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if e.HTML != "" {
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header.Set("Content-Type", fmt.Sprintf("text/html; charset=UTF-8"))
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header.Set("Content-Transfer-Encoding", "quoted-printable")
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if _, err := subWriter.CreatePart(header); err != nil {
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return nil, err
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}
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// Write the text
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if err := quotePrintEncode(buff, e.HTML); err != nil {
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return nil, err
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}
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}
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if err := subWriter.Close(); err != nil {
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return nil, err
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}
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}
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// Create attachment part, if necessary
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for _, a := range e.Attachments {
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ap, err := w.CreatePart(a.Header)
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if err != nil {
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return nil, err
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}
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// Write the base64Wrapped content to the part
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base64Wrap(ap, a.Content)
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}
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if err := w.Close(); err != nil {
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return nil, err
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}
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return buff.Bytes(), nil
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}
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// Attach file to the send mail
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func (e *Email) AttachFile(filename string) (a *Attachment, err error) {
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f, err := os.Open(filename)
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if err != nil {
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return
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}
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ct := mime.TypeByExtension(filepath.Ext(filename))
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basename := path.Base(filename)
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return e.Attach(f, basename, ct)
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}
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// Attach is used to attach content from an io.Reader to the email.
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// Required parameters include an io.Reader, the desired filename for the attachment, and the Content-Type
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func (e *Email) Attach(r io.Reader, filename string, c string) (a *Attachment, err error) {
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var buffer bytes.Buffer
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if _, err = io.Copy(&buffer, r); err != nil {
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return
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}
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at := &Attachment{
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Filename: filename,
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Header: textproto.MIMEHeader{},
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Content: buffer.Bytes(),
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}
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// Get the Content-Type to be used in the MIMEHeader
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if c != "" {
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at.Header.Set("Content-Type", c)
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} else {
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// If the Content-Type is blank, set the Content-Type to "application/octet-stream"
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at.Header.Set("Content-Type", "application/octet-stream")
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}
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at.Header.Set("Content-Disposition", fmt.Sprintf("attachment;\r\n filename=\"%s\"", filename))
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at.Header.Set("Content-Transfer-Encoding", "base64")
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e.Attachments = append(e.Attachments, at)
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return at, nil
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}
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func (e *Email) Send() error {
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if e.Auth == nil {
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e.Auth = smtp.PlainAuth(e.Identity, e.Username, e.Password, e.Host)
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}
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// Merge the To, Cc, and Bcc fields
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to := make([]string, 0, len(e.To)+len(e.Cc)+len(e.Bcc))
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to = append(append(append(to, e.To...), e.Cc...), e.Bcc...)
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// Check to make sure there is at least one recipient and one "From" address
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if e.From == "" || len(to) == 0 {
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return errors.New("Must specify at least one From address and one To address")
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}
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from, err := mail.ParseAddress(e.From)
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if err != nil {
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return err
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}
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raw, err := e.Bytes()
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if err != nil {
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return err
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}
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return smtp.SendMail(e.Host+":"+strconv.Itoa(e.Port), e.Auth, from.Address, to, raw)
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}
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// quotePrintEncode writes the quoted-printable text to the IO Writer (according to RFC 2045)
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func quotePrintEncode(w io.Writer, s string) error {
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var buf [3]byte
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mc := 0
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for i := 0; i < len(s); i++ {
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c := s[i]
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// We're assuming Unix style text formats as input (LF line break), and
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// quoted-printble uses CRLF line breaks. (Literal CRs will become
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// "=0D", but probably shouldn't be there to begin with!)
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if c == '\n' {
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io.WriteString(w, "\r\n")
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mc = 0
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continue
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}
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var nextOut []byte
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if isPrintable(c) {
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nextOut = append(buf[:0], c)
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} else {
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nextOut = buf[:]
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qpEscape(nextOut, c)
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}
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// Add a soft line break if the next (encoded) byte would push this line
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// to or past the limit.
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if mc+len(nextOut) >= maxLineLength {
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if _, err := io.WriteString(w, "=\r\n"); err != nil {
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return err
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}
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mc = 0
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}
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if _, err := w.Write(nextOut); err != nil {
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return err
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}
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mc += len(nextOut)
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}
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// No trailing end-of-line?? Soft line break, then. TODO: is this sane?
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if mc > 0 {
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io.WriteString(w, "=\r\n")
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}
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return nil
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}
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// isPrintable returns true if the rune given is "printable" according to RFC 2045, false otherwise
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func isPrintable(c byte) bool {
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return (c >= '!' && c <= '<') || (c >= '>' && c <= '~') || (c == ' ' || c == '\n' || c == '\t')
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}
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// qpEscape is a helper function for quotePrintEncode which escapes a
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// non-printable byte. Expects len(dest) == 3.
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func qpEscape(dest []byte, c byte) {
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const nums = "0123456789ABCDEF"
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dest[0] = '='
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dest[1] = nums[(c&0xf0)>>4]
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dest[2] = nums[(c & 0xf)]
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}
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// headerToBytes enumerates the key and values in the header, and writes the results to the IO Writer
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func headerToBytes(w io.Writer, t textproto.MIMEHeader) error {
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for k, v := range t {
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// Write the header key
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_, err := fmt.Fprintf(w, "%s:", k)
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if err != nil {
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return err
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}
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// Write each value in the header
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for _, c := range v {
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_, err := fmt.Fprintf(w, " %s\r\n", c)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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// base64Wrap encodeds the attachment content, and wraps it according to RFC 2045 standards (every 76 chars)
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// The output is then written to the specified io.Writer
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func base64Wrap(w io.Writer, b []byte) {
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// 57 raw bytes per 76-byte base64 line.
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const maxRaw = 57
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// Buffer for each line, including trailing CRLF.
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var buffer [maxLineLength + len("\r\n")]byte
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copy(buffer[maxLineLength:], "\r\n")
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// Process raw chunks until there's no longer enough to fill a line.
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for len(b) >= maxRaw {
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base64.StdEncoding.Encode(buffer[:], b[:maxRaw])
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w.Write(buffer[:])
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b = b[maxRaw:]
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}
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// Handle the last chunk of bytes.
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if len(b) > 0 {
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out := buffer[:base64.StdEncoding.EncodedLen(len(b))]
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base64.StdEncoding.Encode(out, b)
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out = append(out, "\r\n"...)
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w.Write(out)
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}
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}
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24
utils/mail_test.go
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24
utils/mail_test.go
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@ -0,0 +1,24 @@
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package utils
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import "testing"
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func TestMail(t *testing.T) {
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config := `{"username":"astaxie@gmail.com","password":"astaxie","host":"smtp.gmail.com","port":587}`
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mail := NewEMail(config)
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if mail.Username != "astaxie@gmail.com" {
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t.Fatal("email parse get username error")
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}
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if mail.Password != "astaxie" {
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t.Fatal("email parse get password error")
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}
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if mail.Host != "smtp.gmail.com" {
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t.Fatal("email parse get host error")
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}
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if mail.Port != 587 {
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t.Fatal("email parse get port error")
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}
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mail.To = []string{"xiemengjun@gmail.com"}
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mail.From = "astaxie@gmail.com"
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mail.Subject = "hi, just from beego!"
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mail.Send()
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}
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