Create app.go file and define app configuration, custom route and basic handler for that route

apps/dashvalidator/pkg/app/app.go

@@ -0,0 +1,89 @@
+package app
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/grafana/grafana-app-sdk/app"
+	"github.com/grafana/grafana-app-sdk/logging"
+	"github.com/grafana/grafana-app-sdk/resource"
+	"github.com/grafana/grafana-app-sdk/simple"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+
+	validatorv1alpha1 "github.com/grafana/grafana/apps/dashvalidator/pkg/apis/dashvalidator/v1alpha1"
+	"github.com/grafana/grafana/pkg/services/datasources"
+	"github.com/grafana/grafana/pkg/services/pluginsintegration/plugincontext"
+)
+
+type DashValidatorConfig struct {
+	DatasourceSvc datasources.DataSourceService
+	PluginCtx     *plugincontext.Provider
+}
+
+func New(cfg app.Config) (app.App, error) {
+	specificConfig, ok := cfg.SpecificConfig.(*DashValidatorConfig)
+	if !ok {
+		return nil, fmt.Errorf("invalid config type: expected DashValidatorConfig")
+	}
+
+	log := logging.DefaultLogger.With("app", "dashvalidator")
+
+	// configure our app
+	simpleConfig := simple.AppConfig{
+		Name:       "dashvalidator",
+		KubeConfig: cfg.KubeConfig,
+
+		//Define our custom route
+		VersionedCustomRoutes: map[string]simple.AppVersionRouteHandlers{
+			"v1alpha1": {
+				{
+					Namespaced: true,
+					Path:       "check",
+					Method:     "POST",
+				}: handleCheckRoute(log, specificConfig.DatasourceSvc, specificConfig.PluginCtx),
+			},
+		},
+	}
+
+	a, err := simple.NewApp(simpleConfig)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create app: %w", err)
+	}
+
+	return a, nil
+}
+
+// custom route handler to check dashboard compatibility
+func handleCheckRoute(
+	log logging.Logger,
+	datasourceSvc datasources.DataSourceService,
+	pluginCtx *plugincontext.Provider,
+) func(context.Context, app.CustomRouteResponseWriter, *app.CustomRouteRequest) error {
+
+	return func(ctx context.Context, w app.CustomRouteResponseWriter, r *app.CustomRouteRequest) error {
+		logger := log.WithContext(ctx)
+		logger.Info("Received compatibility check request")
+
+		// TODO validation logic here
+
+		// for now a simple response
+
+		w.WriteHeader(http.StatusOK)
+		return json.NewEncoder(w).Encode(map[string]interface{}{
+			"message": "Handler working!",
+		})
+	}
+}
+
+func GetKinds() map[schema.GroupVersion][]resource.Kind {
+	gv := schema.GroupVersion{
+		Group:   "dashvalidator.grafana.com",
+		Version: "v1alpha1",
+	}
+
+	return map[schema.GroupVersion][]resource.Kind{
+		gv: {validatorv1alpha1.DashboardCompatibilityScoreKind()},
+	}
+}