feat(api): Add api for getting a single subscription

api/controller/subscription.go

@@ -65,6 +65,16 @@ func CreateSubscription(dataBase moira.Database, userLogin, teamID string, subsc
 	return nil
 }
 
+// GetSubscription returns subscription by it's id.
+func GetSubscription(dataBase moira.Database, subscriptionID string) (*dto.Subscription, *api.ErrorResponse) {
+	subscription, err := dataBase.GetSubscription(subscriptionID)
+	if err != nil {
+		return nil, api.ErrorInternalServer(err)
+	}
+	dto := dto.Subscription(subscription)
+	return &dto, nil
+}
+
 // UpdateSubscription updates existing subscription.
 func UpdateSubscription(dataBase moira.Database, subscriptionID string, userLogin string, subscription *dto.Subscription) *api.ErrorResponse {
 	subscription.ID = subscriptionID

api/handler/subscription.go

@@ -20,6 +20,7 @@ func subscription(router chi.Router) {
 	router.Route("/{subscriptionId}", func(router chi.Router) {
 		router.Use(middleware.SubscriptionContext)
 		router.Use(subscriptionFilter)
+		router.Get("/", getSubscription)
 		router.Put("/", updateSubscription)
 		router.Delete("/", removeSubscription)
 		router.Put("/test", sendTestNotification)
@@ -102,6 +103,31 @@ func subscriptionFilter(next http.Handler) http.Handler {
 	})
 }
 
+// nolint: gofmt,goimports
+//
+//	@summary	Get subscription by id
+//	@id			get-subscription
+//	@tags		subscription
+//	@produce	json
+//	@param		subscriptionID	path		string							true	"ID of the subscription to get"	default(bcba82f5-48cf-44c0-b7d6-e1d32c64a88c)
+//	@success	200				{object}	dto.Subscription				"Subscription fetched successfully"
+//	@failure	403				{object}	api.ErrorForbiddenExample		"Forbidden"
+//	@failure	422				{object}	api.ErrorRenderExample			"Render error"
+//	@failure	500				{object}	api.ErrorInternalServerExample	"Internal server error"
+//	@router		/subscription/{subscriptionID} [get]
+func getSubscription(writer http.ResponseWriter, request *http.Request) {
+	subscriptionID := middleware.GetSubscriptionID(request)
+	subscription, err := controller.GetSubscription(database, subscriptionID)
+	if err != nil {
+		render.Render(writer, request, err) //nolint
+		return
+	}
+	if err := render.Render(writer, request, subscription); err != nil {
+		render.Render(writer, request, api.ErrorRender(err)) //nolint
+		return
+	}
+}
+
 // nolint: gofmt,goimports
 //
 //	@summary	Update a subscription