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-rw-r--r--lib/oauthbearer.go42
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/oauthbearer.go b/lib/oauthbearer.go
new file mode 100644
index 0000000..5bcba60
--- /dev/null
+++ b/lib/oauthbearer.go
@@ -0,0 +1,42 @@
+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 %v", 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)
+}