updated realtime form validator with more human friendly message and added more tests

apis/realtime.go

@@ -161,6 +161,7 @@ type realtimeSubscribeForm struct {
 func (form *realtimeSubscribeForm) validate() error {
 	return validation.ValidateStruct(form,
 		validation.Field(&form.ClientId, validation.Required, validation.Length(1, 255)),
+		validation.Field(&form.Subscriptions, validation.Length(0, 1000)),
 	)
 }
 

apis/realtime_test.go

@@ -3,6 +3,7 @@ package apis_test
 import (
 	"context"
 	"errors"
+	"fmt"
 	"net/http"
 	"strings"
 	"testing"
@@ -100,6 +101,15 @@ func TestRealtimeSubscribe(t *testing.T) {
 		client.Set(apis.RealtimeClientAuthKey, nil)
 	}
 
+	validSubscriptionsLimit := make([]string, 1000)
+	for i := 0; i < len(validSubscriptionsLimit); i++ {
+		validSubscriptionsLimit[i] = fmt.Sprintf(`"%d"`, i)
+	}
+	invalidSubscriptionsLimit := make([]string, 1001)
+	for i := 0; i < len(invalidSubscriptionsLimit); i++ {
+		invalidSubscriptionsLimit[i] = fmt.Sprintf(`"%d"`, i)
+	}
+
 	scenarios := []tests.ApiScenario{
 		{
 			Name:            "missing client",
@@ -110,6 +120,69 @@ func TestRealtimeSubscribe(t *testing.T) {
 			ExpectedContent: []string{`"data":{}`},
 			ExpectedEvents:  map[string]int{"*": 0},
 		},
+		{
+			Name:           "empty data",
+			Method:         http.MethodPost,
+			URL:            "/api/realtime",
+			Body:           strings.NewReader(`{}`),
+			ExpectedStatus: 400,
+			ExpectedContent: []string{
+				`"data":{`,
+				`"clientId":{"code":"validation_required`,
+			},
+			NotExpectedContent: []string{
+				`"subscriptions"`,
+			},
+			ExpectedEvents: map[string]int{"*": 0},
+		},
+		{
+			Name:   "existing client with invalid subscriptions limit",
+			Method: http.MethodPost,
+			URL:    "/api/realtime",
+			Body: strings.NewReader(`{
+				"clientId": "` + client.Id() + `",
+				"subscriptions": [` + strings.Join(invalidSubscriptionsLimit, ",") + `]
+			}`),
+			BeforeTestFunc: func(t testing.TB, app *tests.TestApp, e *core.ServeEvent) {
+				app.SubscriptionsBroker().Register(client)
+			},
+			AfterTestFunc: func(t testing.TB, app *tests.TestApp, res *http.Response) {
+				resetClient()
+			},
+			ExpectedStatus: 400,
+			ExpectedContent: []string{
+				`"data":{`,
+				`"subscriptions":{"code":"validation_length_too_long"`,
+			},
+			ExpectedEvents: map[string]int{"*": 0},
+		},
+		{
+			Name:   "existing client with valid subscriptions limit",
+			Method: http.MethodPost,
+			URL:    "/api/realtime",
+			Body: strings.NewReader(`{
+				"clientId": "` + client.Id() + `",
+				"subscriptions": [` + strings.Join(validSubscriptionsLimit, ",") + `]
+			}`),
+			ExpectedStatus: 204,
+			ExpectedEvents: map[string]int{
+				"*":                          0,
+				"OnRealtimeSubscribeRequest": 1,
+			},
+			BeforeTestFunc: func(t testing.TB, app *tests.TestApp, e *core.ServeEvent) {
+				client.Subscribe("test0") // should be replaced
+				app.SubscriptionsBroker().Register(client)
+			},
+			AfterTestFunc: func(t testing.TB, app *tests.TestApp, res *http.Response) {
+				if len(client.Subscriptions()) != len(validSubscriptionsLimit) {
+					t.Errorf("Expected %d subscriptions, got %d", len(validSubscriptionsLimit), len(client.Subscriptions()))
+				}
+				if client.HasSubscription("test0") {
+					t.Errorf("Expected old subscriptions to be replaced")
+				}
+				resetClient()
+			},
+		},
 		{
 			Name:           "existing client - empty subscriptions",
 			Method:         http.MethodPost,
@@ -126,7 +199,7 @@ func TestRealtimeSubscribe(t *testing.T) {
 			},
 			AfterTestFunc: func(t testing.TB, app *tests.TestApp, res *http.Response) {
 				if len(client.Subscriptions()) != 0 {
-					t.Errorf("Expected no subscriptions, got %v", client.Subscriptions())
+					t.Errorf("Expected no subscriptions, got %d", len(client.Subscriptions()))
 				}
 				resetClient()
 			},