如何通过Gmail Go SDK发送电子邮件？

Question

I'm trying to send a new email through the gmail package . However the Message type which is required by the send method is poorly documented. Most of the fields seem used to actually parse/read emails. The only field which makes sense (at some degree) for the send method is Payload of type MessagePart though I can't figure it out how to generate the MessagePartBody as it seems to be a kind of mime type. Below is the code I have so far.

func (em *Email) SendMessage(cl *Client) error {
    config.ClientId = cl.Username
    config.ClientSecret = cl.Password

    t := &oauth.Transport{

        Config:    config,
        Transport: http.DefaultTransport,
    }
    var tk oauth.Token
    err := json.Unmarshal([]byte(cl.Meta), &tk)
    t.Token = &tk
    if err != nil {
        log.Errorf("meta %v, err %v", cl.Meta, err)
        return err
    }
    gmailService, err := gmail.New(t.Client())
    if err != nil {
        log.Error(err)
        return err
    }

    p := gmail.MessagePart{}
    p.Headers = append(p.Headers, &gmail.MessagePartHeader{
        Name:  "From",
        Value: em.FromEmail,
    })
    p.Headers = append(p.Headers, &gmail.MessagePartHeader{
        Name:  "To",
        Value: em.ToEmail,
    })
    p.Headers = append(p.Headers, &gmail.MessagePartHeader{
        Name:  "Subject",
        Value: em.Subject,
    })

    emsg := base64.StdEncoding.EncodeToString(em.Message)
    log.Info(emsg)
    msg := gmail.Message{
        Payload: &p,
        Raw:     "",
    }
    _, err = gmailService.Users.Messages.Send("me", &msg).Do()
    if err != nil {
        log.Error(err)
        return err
    }
    return err
}

The "REST" API is even more confusing. It requires an uploadType param (WTF to upload) and a raw field which I guess is the raw message which requires a format provided by messages.get. Why would you send a message from your inbox which literally would be a 'resend' as your are on the receipt list ? Am I the only one who thinks this API(or at least the documentation) is just crap ?

Answer 1

It was a bit tricky but here is how you can send emails through the GMAIL API

import(
    "code.google.com/p/goauth2/oauth"
    "code.google.com/p/google-api-go-client/gmail/v1"
    log "github.com/golang/glog"

    "encoding/base64"
    "encoding/json"
    "net/mail"
    "strings"
    )


type Email struct {
    FromName, FromEmail, ToName, ToEmail, Subject string
    Message                                       string
}

func (em *Email) SendMessage(cl *Client) error {
    config.ClientId = cl.Username //oauth clientID
    config.ClientSecret = cl.Password  //oauth client secret 

    t := &oauth.Transport{
        Config:    config,
        Transport: http.DefaultTransport,
    }
    var tk oauth.Token
    err := json.Unmarshal([]byte(cl.Meta), &tk)
    t.Token = &tk
    if err != nil {
        log.Errorf("meta %v, err %v", cl.Meta, err)
        return err
    }
    gmailService, err := gmail.New(t.Client())
    if err != nil {
        log.Error(err)
        return err
    }

    from := mail.Address{em.FromName, em.FromEmail}
    to := mail.Address{em.ToName, em.ToEmail}

    header := make(map[string]string)
    header["From"] = from.String()
    header["To"] = to.String()
    header["Subject"] = encodeRFC2047(em.Subject)
    header["MIME-Version"] = "1.0"
    header["Content-Type"] = "text/html; charset=\"utf-8\""
    header["Content-Transfer-Encoding"] = "base64"

    var msg string
    for k, v := range header {
        msg += fmt.Sprintf("%s: %s
", k, v)
    }
    msg += "
" + em.Message

    gmsg := gmail.Message{
        Raw: encodeWeb64String([]byte(msg)),
    }

    _, err = gmailService.Users.Messages.Send("me", &gmsg).Do()
    if err != nil {
        log.Errorf("em %v, err %v", gmsg, err)
        return err
    }
    return err
}



func encodeRFC2047(s string) string {
    // use mail's rfc2047 to encode any string
    addr := mail.Address{s, ""}
    return strings.Trim(addr.String(), " <>")
}

func encodeWeb64String(b []byte) string {

    s := base64.URLEncoding.EncodeToString(b)

    var i = len(s) - 1
    for s[i] == '=' {
        i--
    }

    return s[0 : i+1]
}