fix: login failures on Postgres when IP is null (#737)

backend/internal/middleware/rate_limit.go

@@ -29,7 +29,7 @@ func (m *RateLimitMiddleware) Add(limit rate.Limit, burst int) gin.HandlerFunc {
 
 		// Skip rate limiting for localhost and test environment
 		// If the client ip is localhost the request comes from the frontend
-		if ip == "127.0.0.1" || ip == "::1" || common.EnvConfig.AppEnv == "test" {
+		if ip == "" || ip == "127.0.0.1" || ip == "::1" || common.EnvConfig.AppEnv == "test" {
 			c.Next()
 			return
 		}

backend/internal/service/audit_log_service.go

@@ -70,12 +70,17 @@ func (s *AuditLogService) CreateNewSignInWithEmail(ctx context.Context, ipAddres
 
 	// Count the number of times the user has logged in from the same device
 	var count int64
-	err := tx.
+	stmt := tx.
 		WithContext(ctx).
 		Model(&model.AuditLog{}).
-		Where("user_id = ? AND ip_address = ? AND user_agent = ?", userID, ipAddress, userAgent).
+		Where("user_id = ? AND user_agent = ?", userID, ipAddress)
-		Count(&count).
+	if ipAddress == "" {
-		Error
+		// An empty IP address is stored as NULL in the database
+		stmt = stmt.Where("ip_address IS NULL")
+	} else {
+		stmt = stmt.Where("ip_address = ?", ipAddress)
+	}
+	err := stmt.Count(&count).Error
 	if err != nil {
 		log.Printf("Failed to count audit logs: %v", err)
 		return createdAuditLog

backend/internal/service/user_service.go

@@ -469,9 +469,7 @@ func (s *UserService) ExchangeOneTimeAccessToken(ctx context.Context, token stri
 		return model.User{}, "", err
 	}
 
-	if ipAddress != "" && userAgent != "" {
 	s.auditLogService.Create(ctx, model.AuditLogEventOneTimeAccessTokenSignIn, ipAddress, userAgent, oneTimeAccessToken.User.ID, model.AuditLogData{}, tx)
-	}
 
 	err = tx.Commit().Error
 	if err != nil {