Hi there,
I have been trying for quite some time to get over an error while trying to
send an email using a service account, via the Gmail API.
I get:
> googleapi: Error 400: Precondition check failed., failedPrecondition
Code is:
package gmailApi
import (
"encoding/base64"
"fmt"
"net/mail"
"strings"
"golang.org/x/net/context"
"google.golang.org/api/gmail/v1"
"google.golang.org/api/option"
)
func SendEmailVerification() {
srv, err := gmail.NewService(context.Background(), option.
WithCredentialsFile("credentials.json"), option.WithScopes(
"https://mail.google.com/";, "https://www.googleapis.com/auth/gmail.modify";,
"https://www.googleapis.com/auth/gmail.compose";,
"https://www.googleapis.com/auth/gmail.send";))
if err != nil {
fmt.Println(err) // BUG(Vincent): TEST
}
// New message for our gmail service to send
var message gmail.Message
// Compose the message
// @ symbol modified for publishing on golang-nuts
messageStr := []byte(
"From: vincent[at]gamifly.gg\r\n" +
"To: jouglardv[at]gmail.com\r\n" +
"Subject: My first Gmail API message\r\n\r\n" +
"Message body goes here!")
// Place messageStr into message.Raw in base64 encoded format
message.Raw = base64.URLEncoding.EncodeToString(messageStr)
if rslt, err := srv.Users.GetProfile("me").Do(); err != nil {
fmt.Println(err) // BUG(Vincent): TEST
} else {
fmt.Println("111", rslt)
}
msg := ComposeMessage()
_, err = srv.Users.Messages.Send("me", msg).Do()
if err != nil {
fmt.Println(err) // BUG(Vincent): TEST
} else {
fmt.Println("OKOKOK")
}
}
func ComposeMessage() *gmail.Message {
from := mail.Address{"Vincent", "vincent[at]gamifly.gg"} // @ symbol
modified for publishing on golang-nuts
to := mail.Address{"Vincent", "jouglardv[at]gmail.com"} // @ symbol
modified for publishing on golang-nuts
header := make(map[string]string)
header["From"] = from.String()
header["To"] = to.String()
header["Subject"] = encodeRFC2047("Hello, Gmail!")
header["MIME-Version"] = "1.0"
header["Content-Type"] = "text/plain; charset=\"utf-8\""
header["Content-Transfer-Encoding"] = "base64"
var msg string
for k, v := range header {
msg += fmt.Sprintf("%s: %s\r\n", k, v)
}
msg += "\r\n" + "Message"
return &gmail.Message{
Raw: base64.RawURLEncoding.EncodeToString([]byte(msg)),
}
}
func encodeRFC2047(s string) string {
// use mail's rfc2047 to encode any string
addr := mail.Address{s, ""}
return strings.Trim(addr.String(), " <>")
}
vincent[at]gamifly.gg is the GSuite user that is being impersonated.
jouglardv[at]gmail.com is a personnal address for testing purpose (plz
don't spam <3 )
The service account has domain delegation activated, scopes that are passed
are in API Controls > Domain-Wide Delegation:
>
> https://www.googleapis.com/auth/gmail.send, https://mail.google.com/,
> https://www.googleapis.com/auth/gmail.modify,
> https://www.googleapis.com/auth/gmail.compose
Is there anything wrong that I may be doing ?
Thanks guys
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