Mono repo -> Master (#22553)

Combines the following repositories into one:

https://github.com/mattermost/mattermost-server
https://github.com/mattermost/mattermost-webapp
https://github.com/mattermost/focalboard
https://github.com/mattermost/mattermost-plugin-playbooks

server/channels/api4/graphql_test.go

@@ -0,0 +1,34 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package api4
+
+import (
+	"os"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGraphQLPayload(t *testing.T) {
+	os.Setenv("MM_FEATUREFLAGS_GRAPHQL", "true")
+	defer os.Unsetenv("MM_FEATUREFLAGS_GRAPHQL")
+
+	th := Setup(t).InitBasic()
+	defer th.TearDown()
+
+	largeString := strings.Repeat("hello", 204800)
+
+	input := graphQLInput{
+		OperationName: "config",
+		Query:         largeString,
+	}
+
+	resp, err := th.MakeGraphQLRequest(&input)
+	require.NoError(t, err)
+	require.Len(t, resp.Errors, 1)
+	// The actual error isn't exposed. We compare the string
+	// to not confuse with other errors.
+	require.Contains(t, resp.Errors[0].Message, "request body too large")
+}