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