Gh 10166 (#13021)

* model/config: add required server config field to manifest

* plugin/helpers: add check required server configuration method

* plugin/helpers: code polish

* model/manifest: add documentation

* Update plugin/helpers_config.go

Co-Authored-By: Ben Schumacher <ben.schumacher@mattermost.com>

* plugin/helpers_config: remove stagnant line

* plugin/helpers: update to v5

* plugin/helpers_config: add license

Co-authored-by: Ben Schumacher <ben.schumacher@mattermost.com>
Co-authored-by: Jesse Hallam <jesse.hallam@gmail.com>
Co-authored-by: mattermod <mattermod@users.noreply.github.com>

plugin/helpers_config.go

@@ -0,0 +1,32 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package plugin
+
+import (
+	"github.com/pkg/errors"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/utils"
+)
+
+// CheckRequiredServerConfiguration implements Helpers.CheckRequiredServerConfiguration
+func (p *HelpersImpl) CheckRequiredServerConfiguration(req *model.Config) (bool, error) {
+	if req == nil {
+		return true, nil
+	}
+
+	cfg := p.API.GetConfig()
+
+	mc, err := utils.Merge(req, cfg, nil)
+	if err != nil {
+		return false, errors.Wrap(err, "could not merge configurations")
+	}
+
+	mergedCfg := mc.(model.Config)
+	if mergedCfg.ToJson() != cfg.ToJson() {
+		return false, nil
+	}
+
+	return true, nil
+}