Add error logging to SSO authentication middleware

- Integrate zerolog for detailed error logging in AuthMiddleware
- Log errors when reading SSO response body or unmarshaling response
- Improve error traceability during authentication process

internal/middleware/auth.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 
 	"github.com/gin-gonic/gin"
+	"github.com/rs/zerolog/log"
 	"gitlab.com/tensorsecurity-rd/waf-console/internal/utils"
 )
 
@@ -56,6 +57,7 @@ func AuthMiddleware(ssoUrl string) gin.HandlerFunc {
 		// Read response body
 		body, err := io.ReadAll(resp.Body)
 		if err != nil {
+			log.Error().Err(err).Msg("failed to read sso response body")
 			utils.AssembleResponse(c, nil, utils.ErrInternalServer)
 			c.Abort()
 			return
@@ -64,6 +66,7 @@ func AuthMiddleware(ssoUrl string) gin.HandlerFunc {
 		// Parse SSO response
 		var ssoResp SSOResponse
 		if err := json.Unmarshal(body, &ssoResp); err != nil {
+			log.Error().Err(err).Msg("failed to unmarshal sso response")
 			utils.AssembleResponse(c, nil, utils.ErrInternalServer)
 			c.Abort()
 			return