Moving slash-commands out of app package (#14979)

* Moving slash-commands out of app package

* Fixing golint checks

* Fixing golangci-lint

* Fixing golangci-lint errors

app/slashcommands/command_remove.go

@@ -0,0 +1,153 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"strings"
+
+	goi18n "github.com/mattermost/go-i18n/i18n"
+
+	"github.com/mattermost/mattermost-server/v5/app"
+	"github.com/mattermost/mattermost-server/v5/mlog"
+	"github.com/mattermost/mattermost-server/v5/model"
+)
+
+type RemoveProvider struct {
+}
+
+type KickProvider struct {
+}
+
+const (
+	CMD_REMOVE = "remove"
+	CMD_KICK   = "kick"
+)
+
+func init() {
+	app.RegisterCommandProvider(&RemoveProvider{})
+	app.RegisterCommandProvider(&KickProvider{})
+}
+
+func (me *RemoveProvider) GetTrigger() string {
+	return CMD_REMOVE
+}
+
+func (me *KickProvider) GetTrigger() string {
+	return CMD_KICK
+}
+
+func (me *RemoveProvider) GetCommand(a *app.App, T goi18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_REMOVE,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_remove.desc"),
+		AutoCompleteHint: T("api.command_remove.hint"),
+		DisplayName:      T("api.command_remove.name"),
+	}
+}
+
+func (me *KickProvider) GetCommand(a *app.App, T goi18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_KICK,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_remove.desc"),
+		AutoCompleteHint: T("api.command_remove.hint"),
+		DisplayName:      T("api.command_kick.name"),
+	}
+}
+
+func (me *RemoveProvider) DoCommand(a *app.App, args *model.CommandArgs, message string) *model.CommandResponse {
+	return doCommand(a, args, message)
+}
+
+func (me *KickProvider) DoCommand(a *app.App, args *model.CommandArgs, message string) *model.CommandResponse {
+	return doCommand(a, args, message)
+}
+
+func doCommand(a *app.App, args *model.CommandArgs, message string) *model.CommandResponse {
+	channel, err := a.GetChannel(args.ChannelId)
+	if err != nil {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_channel_remove.channel.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	switch channel.Type {
+	case model.CHANNEL_OPEN:
+		if !a.HasPermissionToChannel(args.UserId, args.ChannelId, model.PERMISSION_MANAGE_PUBLIC_CHANNEL_MEMBERS) {
+			return &model.CommandResponse{
+				Text:         args.T("api.command_remove.permission.app_error"),
+				ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+			}
+		}
+	case model.CHANNEL_PRIVATE:
+		if !a.HasPermissionToChannel(args.UserId, args.ChannelId, model.PERMISSION_MANAGE_PRIVATE_CHANNEL_MEMBERS) {
+			return &model.CommandResponse{
+				Text:         args.T("api.command_remove.permission.app_error"),
+				ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+			}
+		}
+	default:
+		return &model.CommandResponse{
+			Text:         args.T("api.command_remove.direct_group.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if len(message) == 0 {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_remove.message.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	targetUsername := ""
+
+	targetUsername = strings.SplitN(message, " ", 2)[0]
+	targetUsername = strings.TrimPrefix(targetUsername, "@")
+
+	userProfile, err := a.Srv().Store.User().GetByUsername(targetUsername)
+	if err != nil {
+		mlog.Error(err.Error())
+		return &model.CommandResponse{
+			Text:         args.T("api.command_remove.missing.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+	if userProfile.DeleteAt != 0 {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_remove.missing.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	_, err = a.GetChannelMember(args.ChannelId, userProfile.Id)
+	if err != nil {
+		nameFormat := *a.Config().TeamSettings.TeammateNameDisplay
+		return &model.CommandResponse{
+			Text: args.T("api.command_remove.user_not_in_channel", map[string]interface{}{
+				"Username": userProfile.GetDisplayName(nameFormat),
+			}),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if err = a.RemoveUserFromChannel(userProfile.Id, args.UserId, channel); err != nil {
+		var text string
+		if err.Id == "api.channel.remove_members.denied" {
+			text = args.T("api.command_remove.group_constrained_user_denied")
+		} else {
+			text = args.T(err.Id, map[string]interface{}{
+				"Channel": model.DEFAULT_CHANNEL,
+			})
+		}
+		return &model.CommandResponse{
+			Text:         text,
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	return &model.CommandResponse{}
+}