login: wrap some common errors to return 400 instead of 500 (#114)

pkg/connector/login.go

@@ -19,6 +19,7 @@ package connector
 import (
 	"context"
 	"fmt"
+	"net/http"
 	"strings"
 
 	"maunium.net/go/mautrix/bridgev2"
@@ -38,6 +39,24 @@ const (
 	LoginStepIDComplete = "fi.mau.telegram.login.complete"
 )
 
+var (
+	ErrInvalidPassword = bridgev2.RespError{
+		ErrCode:    "FI.MAU.TELEGRAM.INVALID_PASSWORD",
+		Err:        "Invalid password",
+		StatusCode: http.StatusBadRequest,
+	}
+	ErrPhoneCodeInvalid = bridgev2.RespError{
+		ErrCode:    "FI.MAU.TELEGRAM.PHONE_CODE_INVALID",
+		Err:        "Invalid phone code",
+		StatusCode: http.StatusBadRequest,
+	}
+	ErrSignUpNotSupported = bridgev2.RespError{
+		ErrCode:    "FI.MAU.TELEGRAM.SIGN_UP_NOT_SUPPORTED",
+		Err:        "New account creation is not supported",
+		StatusCode: http.StatusBadRequest,
+	}
+)
+
 func (tg *TelegramConnector) GetLoginFlows() []bridgev2.LoginFlow {
 	return []bridgev2.LoginFlow{
 		{

pkg/connector/loginphone.go

@@ -152,8 +152,10 @@ func (p *PhoneLogin) SubmitUserInput(ctx context.Context, input map[string]strin
 					},
 				},
 			}, nil
+		} else if errors.Is(err, auth.ErrPhoneCodeInvalid) {
+			return nil, ErrPhoneCodeInvalid
 		} else if errors.Is(err, &auth.SignUpRequired{}) {
-			return nil, fmt.Errorf("sign-up is not supported")
+			return nil, ErrSignUpNotSupported
 		} else if err != nil {
 			return nil, fmt.Errorf("failed to submit code: %w", err)
 		}
@@ -161,6 +163,9 @@ func (p *PhoneLogin) SubmitUserInput(ctx context.Context, input map[string]strin
 	} else if password, ok := input[LoginStepIDPassword]; ok {
 		authorization, err := p.authClient.Auth().Password(p.authClientCtx, password)
 		if err != nil {
+			if errors.Is(err, auth.ErrPasswordInvalid) {
+				return nil, ErrInvalidPassword
+			}
 			return nil, fmt.Errorf("failed to submit password: %w", err)
 		}
 		return p.handleAuthSuccess(ctx, authorization)

pkg/connector/loginqr.go

@@ -29,6 +29,7 @@ import (
 	"maunium.net/go/mautrix/bridgev2"
 
 	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram"
+	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/auth"
 	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/auth/qrlogin"
 	"go.mau.fi/mautrix-telegram/pkg/gotd/telegram/updates"
 	"go.mau.fi/mautrix-telegram/pkg/gotd/tg"
@@ -193,6 +194,9 @@ func (q *QRLogin) SubmitUserInput(ctx context.Context, input map[string]string)
 	}
 	authorization, err := q.authClient.Auth().Password(q.authClientCtx, password)
 	if err != nil {
+		if errors.Is(err, auth.ErrPasswordInvalid) {
+			return nil, ErrInvalidPassword
+		}
 		return nil, fmt.Errorf("failed to submit password: %w", err)
 	}