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.go

@@ -58,6 +58,12 @@ type Helpers interface {
 	// Minimum server version: 5.6
 	KVSetWithExpiryJSON(key string, value interface{}, expireInSeconds int64) error
 
+	// CheckRequiredServerConfiguration checks if the server is configured according to
+	// plugin requirements.
+	//
+	// Minimum server version: 5.2
+	CheckRequiredServerConfiguration(req *model.Config) (bool, error)
+
 	// ShouldProcessMessage returns if the message should be processed by a message hook.
 	//
 	// Use this method to avoid processing unnecessary messages in a MessageHasBeenPosted

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
+}

plugin/helpers_config_test.go

@@ -0,0 +1,82 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package plugin_test
+
+import (
+	"testing"
+
+	"github.com/mattermost/mattermost-server/v5/model"
+	"github.com/mattermost/mattermost-server/v5/plugin"
+	"github.com/mattermost/mattermost-server/v5/plugin/plugintest"
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCheckRequiredServerConfiguration(t *testing.T) {
+	for name, test := range map[string]struct {
+		SetupAPI     func(*plugintest.API) *plugintest.API
+		Input        *model.Config
+		ShouldReturn bool
+		ShouldError  bool
+	}{
+		"no required config therefore it should be compatible": {
+			SetupAPI: func(api *plugintest.API) *plugintest.API {
+				return api
+			},
+			Input:        nil,
+			ShouldReturn: true,
+			ShouldError:  false,
+		},
+		"same configurations": {
+			SetupAPI: func(api *plugintest.API) *plugintest.API {
+				api.On("GetConfig").Return(&model.Config{
+					ServiceSettings: model.ServiceSettings{
+						EnableCommands: model.NewBool(true),
+					},
+				})
+
+				return api
+			},
+			Input: &model.Config{
+				ServiceSettings: model.ServiceSettings{
+					EnableCommands: model.NewBool(true),
+				},
+			},
+			ShouldReturn: true,
+			ShouldError:  false,
+		},
+		"different configurations": {
+			SetupAPI: func(api *plugintest.API) *plugintest.API {
+				api.On("GetConfig").Return(&model.Config{})
+
+				return api
+			},
+			Input: &model.Config{
+				ServiceSettings: model.ServiceSettings{
+					EnableCommands: model.NewBool(true),
+				},
+			},
+			ShouldReturn: false,
+			ShouldError:  false,
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			api := test.SetupAPI(&plugintest.API{})
+			defer api.AssertExpectations(t)
+
+			p := &plugin.HelpersImpl{}
+			p.API = api
+
+			ok, err := p.CheckRequiredServerConfiguration(test.Input)
+
+			if !ok {
+				assert.False(t, ok)
+			}
+			if test.ShouldError {
+				assert.NotNil(t, err)
+			} else {
+				assert.Nil(t, err)
+			}
+		})
+	}
+}

plugin/plugintest/helpers.go

@@ -15,6 +15,27 @@ type Helpers struct {
 	mock.Mock
 }
 
+// CheckRequiredServerConfiguration provides a mock function with given fields: req
+func (_m *Helpers) CheckRequiredServerConfiguration(req *model.Config) (bool, error) {
+	ret := _m.Called(req)
+
+	var r0 bool
+	if rf, ok := ret.Get(0).(func(*model.Config) bool); ok {
+		r0 = rf(req)
+	} else {
+		r0 = ret.Get(0).(bool)
+	}
+
+	var r1 error
+	if rf, ok := ret.Get(1).(func(*model.Config) error); ok {
+		r1 = rf(req)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
 // EnsureBot provides a mock function with given fields: bot, options
 func (_m *Helpers) EnsureBot(bot *model.Bot, options ...plugin.EnsureBotOption) (string, error) {
 	_va := make([]interface{}, len(options))