OIDC 인증 로직 수정 및 백엔드 라우팅 오류 해결

backend/cmd/server/main.go

@@ -242,6 +242,7 @@ func main() {
 	app := fiber.New(fiber.Config{
 		AppName:               "Baron SSO Backend",
 		DisableStartupMessage: true, // Clean logs
+		ReadBufferSize:        32768, // 32KB로 증가 (긴 OIDC 챌린지 대응)
 		// Global Error Handler for Production Masking
 		ErrorHandler: func(c *fiber.Ctx, err error) error {
 			// Default status code
@@ -459,6 +460,9 @@ func main() {
 	auth.Post("/login/code/verify", authHandler.VerifyLoginCode)
 	auth.Post("/login/code/verify-short", authHandler.VerifyLoginShortCode)
 	auth.Post("/password/login", authHandler.PasswordLogin)
+	auth.Get("/consent", authHandler.GetConsentRequest)
+	auth.Post("/consent/accept", authHandler.AcceptConsentRequest)
+
 	auth.Post("/password/reset/initiate", authHandler.InitiatePasswordReset)
 	// [Changed] Use Interstitial Page for GET to prevent Scanner consumption
 	auth.Get("/password/reset/verify", authHandler.VerifyPasswordResetPage)

backend/internal/handler/auth_handler.go

@@ -1268,6 +1268,7 @@ func (h *AuthHandler) PasswordLogin(c *fiber.Ctx) error {
 	var req struct {
 		LoginID        string `json:"loginId"`
 		Password       string `json:"password"`
+		LoginChallenge string `json:"login_challenge,omitempty"`
 	}
 
 	if err := c.BodyParser(&req); err != nil {
@@ -1314,6 +1315,21 @@ func (h *AuthHandler) PasswordLogin(c *fiber.Ctx) error {
 	setSessionIDLocal(c, authInfo.SessionToken)
 	ale.Log(slog.LevelInfo, "Login successful", slog.String("provider", h.IdpProvider.Name()), slog.String("subject", authInfo.Subject))
 
+	// --- OIDC 로그인 흐름 처리 ---
+	if req.LoginChallenge != "" {
+		slog.Info("OIDC login flow detected", "challenge", req.LoginChallenge)
+		acceptResp, err := h.Hydra.AcceptLoginRequest(c.Context(), req.LoginChallenge, authInfo.Subject)
+		if err != nil {
+			slog.Error("failed to accept hydra login request", "error", err)
+			return fiber.NewError(fiber.StatusInternalServerError, "Failed to accept OIDC login request")
+		}
+		slog.Info("Hydra login request accepted", "redirectTo", acceptResp.RedirectTo)
+		return c.JSON(fiber.Map{
+			"redirectTo": acceptResp.RedirectTo,
+		})
+	}
+	// --- OIDC 로그인 흐름 처리 끝 ---
+
 	resp := fiber.Map{
 		"sessionJwt": authInfo.SessionToken.JWT,
 		"status":     "ok",
@@ -2897,6 +2913,48 @@ func (h *AuthHandler) ListLinkedRps(c *fiber.Ctx) error {
 	return c.JSON(linkedRpListResponse{Items: items})
 }
 
+func (h *AuthHandler) GetConsentRequest(c *fiber.Ctx) error {
+	challenge := c.Query("consent_challenge")
+	if challenge == "" {
+		return fiber.NewError(fiber.StatusBadRequest, "consent_challenge is required")
+	}
+
+	consentRequest, err := h.Hydra.GetConsentRequest(c.Context(), challenge)
+	if err != nil {
+		slog.Error("failed to get hydra consent request", "error", err)
+		return fiber.NewError(fiber.StatusInternalServerError, "Failed to get consent information")
+	}
+
+	return c.JSON(consentRequest)
+}
+
+func (h *AuthHandler) AcceptConsentRequest(c *fiber.Ctx) error {
+	var req struct {
+		ConsentChallenge string `json:"consent_challenge"`
+	}
+	if err := c.BodyParser(&req); err != nil {
+		return fiber.NewError(fiber.StatusBadRequest, "Invalid request body")
+	}
+	if req.ConsentChallenge == "" {
+		return fiber.NewError(fiber.StatusBadRequest, "consent_challenge is required")
+	}
+
+	consentRequest, err := h.Hydra.GetConsentRequest(c.Context(), req.ConsentChallenge)
+	if err != nil {
+		slog.Error("failed to get hydra consent request before accepting", "error", err)
+		return fiber.NewError(fiber.StatusInternalServerError, "Failed to get consent information")
+	}
+
+	acceptResp, err := h.Hydra.AcceptConsentRequest(c.Context(), req.ConsentChallenge, consentRequest)
+	if err != nil {
+		slog.Error("failed to accept hydra consent request", "error", err)
+		return fiber.NewError(fiber.StatusInternalServerError, "Failed to accept consent request")
+	}
+
+	return c.JSON(acceptResp)
+}
+
+
 func (h *AuthHandler) resolveCurrentProfile(c *fiber.Ctx) (*domain.UserProfileResponse, error) {
 	token := h.getBearerToken(c)
 	if token != "" {

backend/internal/service/hydra_admin_service.go

@@ -36,6 +36,15 @@ type HydraClient struct {
 	Metadata                map[string]interface{} `json:"metadata,omitempty"`
 }
 
+type HydraConsentRequest struct {
+	Challenge         string      `json:"challenge"`
+	RequestedScope    []string    `json:"requested_scope"`
+	RequestedAudience []string    `json:"requested_access_token_audience"`
+	Skip              bool        `json:"skip"`
+	Subject           string      `json:"subject"`
+	Client            HydraClient `json:"client"`
+}
+
 type HydraConsentSession struct {
 	Subject         string      `json:"subject"`
 	GrantedScope    []string    `json:"granted_scope"`
@@ -347,3 +356,134 @@ func (s *HydraAdminService) buildURLWithParams(path string, params map[string]st
 	u.RawQuery = q.Encode()
 	return u.String(), nil
 }
+
+type AcceptLoginRequestResponse struct {
+	RedirectTo string `json:"redirectTo"`
+}
+
+type AcceptConsentRequestResponse struct {
+	RedirectTo string `json:"redirectTo"`
+}
+
+func (s *HydraAdminService) GetConsentRequest(ctx context.Context, challenge string) (*HydraConsentRequest, error) {
+	params := map[string]string{
+		"consent_challenge": challenge,
+	}
+	endpoint, err := s.buildURLWithParams("/oauth2/auth/requests/consent", params)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, endpoint, nil)
+	if err != nil {
+		return nil, fmt.Errorf("hydra admin: create request for get consent failed: %w", err)
+	}
+
+	resp, err := s.httpClient().Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("hydra admin: get consent request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	body, _ := io.ReadAll(resp.Body)
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("hydra admin: get consent failed status=%d body=%s", resp.StatusCode, string(body))
+	}
+
+	var consentReq HydraConsentRequest
+	if err := json.Unmarshal(body, &consentReq); err != nil {
+		return nil, fmt.Errorf("hydra admin: decode get consent response failed: %w", err)
+	}
+
+	return &consentReq, nil
+}
+
+func (s *HydraAdminService) AcceptConsentRequest(ctx context.Context, challenge string, grantInfo *HydraConsentRequest) (*AcceptConsentRequestResponse, error) {
+	params := map[string]string{
+		"consent_challenge": challenge,
+	}
+	endpoint, err := s.buildURLWithParams("/oauth2/auth/requests/consent/accept", params)
+	if err != nil {
+		return nil, err
+	}
+
+	payload := map[string]interface{}{
+		"grant_scope":    grantInfo.RequestedScope,
+		"grant_audience": grantInfo.RequestedAudience,
+		"remember":       true,
+		"remember_for":   3600,
+	}
+	body, _ := json.Marshal(payload)
+
+	req, err := http.NewRequestWithContext(ctx, "PUT", endpoint, bytes.NewReader(body))
+	if err != nil {
+		return nil, fmt.Errorf("hydra admin: create request for accept consent failed: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.httpClient().Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("hydra admin: accept consent request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, _ := io.ReadAll(resp.Body)
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("hydra admin: accept consent failed status=%d body=%s", resp.StatusCode, string(respBody))
+	}
+
+	// Hydra 응답(redirect_to)을 읽어서 우리 응답(redirectTo)으로 변환
+	var hydraResp struct {
+		RedirectTo string `json:"redirect_to"`
+	}
+	if err := json.Unmarshal(respBody, &hydraResp); err != nil {
+		return nil, fmt.Errorf("hydra admin: decode accept consent response failed: %w", err)
+	}
+
+	return &AcceptConsentRequestResponse{RedirectTo: hydraResp.RedirectTo}, nil
+}
+
+
+func (s *HydraAdminService) AcceptLoginRequest(ctx context.Context, challenge string, subject string) (*AcceptLoginRequestResponse, error) {
+	params := map[string]string{
+		"login_challenge": challenge,
+	}
+	endpoint, err := s.buildURLWithParams("/oauth2/auth/requests/login/accept", params)
+	if err != nil {
+		return nil, err
+	}
+
+	payload := map[string]interface{}{
+		"subject":      subject,
+		"remember":     true,
+		"remember_for": 3600,
+	}
+	body, _ := json.Marshal(payload)
+
+	req, err := http.NewRequestWithContext(ctx, "PUT", endpoint, bytes.NewReader(body))
+	if err != nil {
+		return nil, fmt.Errorf("hydra admin: create request for accept login failed: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.httpClient().Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("hydra admin: accept login request failed: %w", err)
+	}
+	defer resp.Body.Close()
+
+	respBody, _ := io.ReadAll(resp.Body)
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("hydra admin: accept login failed status=%d body=%s", resp.StatusCode, string(respBody))
+	}
+
+	// Hydra 응답(redirect_to)을 읽어서 우리 응답(redirectTo)으로 변환
+	var hydraResp struct {
+		RedirectTo string `json:"redirect_to"`
+	}
+	if err := json.Unmarshal(respBody, &hydraResp); err != nil {
+		return nil, fmt.Errorf("hydra admin: decode accept login response failed: %w", err)
+	}
+
+	return &AcceptLoginRequestResponse{RedirectTo: hydraResp.RedirectTo}, nil
+}