feat: update AIConfig route handler and add validation utility function with tests

internal/pkg/httpx/params/params.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"log/slog"
 	"net/http"
+	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -54,7 +55,7 @@ func ReadForm(ctx *gin.Context, obj any) error {
 	if err := decoder.Decode(obj, values); err != nil {
 		return err
 	}
-	return validate.Struct(obj)
+	return validateStruct(obj)
 }
 
 func ReadJSON(ctx *gin.Context, obj any) error {
@@ -64,6 +65,23 @@ func ReadJSON(ctx *gin.Context, obj any) error {
 	if err := ctx.ShouldBindJSON(obj); err != nil {
 		return err
 	}
+	return validateStruct(obj)
+}
+
+func validateStruct(obj any) error {
+	if obj == nil {
+		return nil
+	}
+	value := reflect.ValueOf(obj)
+	for value.Kind() == reflect.Pointer {
+		if value.IsNil() {
+			return validate.Struct(obj)
+		}
+		value = value.Elem()
+	}
+	if value.Kind() != reflect.Struct {
+		return nil
+	}
 	return validate.Struct(obj)
 }
 

internal/pkg/httpx/params/params_test.go

@@ -0,0 +1,31 @@
+package params
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gin-gonic/gin"
+)
+
+func newJSONContext(body string) *gin.Context {
+	gin.SetMode(gin.TestMode)
+	w := httptest.NewRecorder()
+	ctx, _ := gin.CreateTestContext(w)
+	ctx.Request = httptest.NewRequest(http.MethodPost, "/", strings.NewReader(body))
+	ctx.Request.Header.Set("Content-Type", "application/json")
+	return ctx
+}
+
+func TestReadJSONAcceptsRootArray(t *testing.T) {
+	var ids []int64
+
+	if err := ReadJSON(newJSONContext(`[3,4]`), &ids); err != nil {
+		t.Fatalf("ReadJSON returned error: %v", err)
+	}
+
+	if len(ids) != 2 || ids[0] != 3 || ids[1] != 4 {
+		t.Fatalf("expected ids [3 4], got %#v", ids)
+	}
+}