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package lib
import (
"context"
"fmt"
"github.com/emersion/go-imap/client"
"github.com/emersion/go-sasl"
"golang.org/x/oauth2"
)
type OAuthBearer struct {
OAuth2 *oauth2.Config
Enabled bool
}
func (c *OAuthBearer) ExchangeRefreshToken(refreshToken string) (*oauth2.Token, error) {
token := new(oauth2.Token)
token.RefreshToken = refreshToken
token.TokenType = "Bearer"
return c.OAuth2.TokenSource(context.TODO(), token).Token()
}
func (c *OAuthBearer) Authenticate(username string, password string, client *client.Client) error {
if ok, err := client.SupportAuth(sasl.OAuthBearer); err != nil || !ok {
return fmt.Errorf("OAuthBearer not supported %w", err)
}
if c.OAuth2.Endpoint.TokenURL != "" {
token, err := c.ExchangeRefreshToken(password)
if err != nil {
return err
}
password = token.AccessToken
}
saslClient := sasl.NewOAuthBearerClient(&sasl.OAuthBearerOptions{
Username: username,
Token: password,
})
return client.Authenticate(saslClient)
}
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