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_invite.go

@@ -0,0 +1,172 @@
+// 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 InviteProvider struct {
+}
+
+const (
+	CMD_INVITE = "invite"
+)
+
+func init() {
+	app.RegisterCommandProvider(&InviteProvider{})
+}
+
+func (me *InviteProvider) GetTrigger() string {
+	return CMD_INVITE
+}
+
+func (me *InviteProvider) GetCommand(a *app.App, T goi18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CMD_INVITE,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_invite.desc"),
+		AutoCompleteHint: T("api.command_invite.hint"),
+		DisplayName:      T("api.command_invite.name"),
+	}
+}
+
+func (me *InviteProvider) DoCommand(a *app.App, args *model.CommandArgs, message string) *model.CommandResponse {
+	if message == "" {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_invite.missing_message.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	splitMessage := strings.SplitN(message, " ", 2)
+	targetUsername := splitMessage[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_invite.missing_user.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if userProfile.DeleteAt != 0 {
+		return &model.CommandResponse{
+			Text:         args.T("api.command_invite.missing_user.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	var channelToJoin *model.Channel
+	// User set a channel to add the invited user
+	if len(splitMessage) > 1 && splitMessage[1] != "" {
+		targetChannelName := strings.TrimPrefix(strings.TrimSpace(splitMessage[1]), "~")
+
+		if channelToJoin, err = a.GetChannelByName(targetChannelName, args.TeamId, false); err != nil {
+			return &model.CommandResponse{
+				Text: args.T("api.command_invite.channel.error", map[string]interface{}{
+					"Channel": targetChannelName,
+				}),
+				ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+			}
+		}
+	} else {
+		channelToJoin, err = a.GetChannel(args.ChannelId)
+		if err != nil {
+			return &model.CommandResponse{
+				Text:         args.T("api.command_invite.channel.app_error"),
+				ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+			}
+		}
+	}
+
+	// Permissions Check
+	switch channelToJoin.Type {
+	case model.CHANNEL_OPEN:
+		if !a.HasPermissionToChannel(args.UserId, channelToJoin.Id, model.PERMISSION_MANAGE_PUBLIC_CHANNEL_MEMBERS) {
+			return &model.CommandResponse{
+				Text: args.T("api.command_invite.permission.app_error", map[string]interface{}{
+					"User":    userProfile.Username,
+					"Channel": channelToJoin.Name,
+				}),
+				ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+			}
+		}
+	case model.CHANNEL_PRIVATE:
+		if !a.HasPermissionToChannel(args.UserId, channelToJoin.Id, model.PERMISSION_MANAGE_PRIVATE_CHANNEL_MEMBERS) {
+			if _, err = a.GetChannelMember(channelToJoin.Id, args.UserId); err == nil {
+				// User doing the inviting is a member of the channel.
+				return &model.CommandResponse{
+					Text: args.T("api.command_invite.permission.app_error", map[string]interface{}{
+						"User":    userProfile.Username,
+						"Channel": channelToJoin.Name,
+					}),
+					ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+				}
+			} else {
+				// User doing the inviting is *not* a member of the channel.
+				return &model.CommandResponse{
+					Text: args.T("api.command_invite.private_channel.app_error", map[string]interface{}{
+						"Channel": channelToJoin.Name,
+					}),
+					ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+				}
+			}
+		}
+	default:
+		return &model.CommandResponse{
+			Text:         args.T("api.command_invite.directchannel.app_error"),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	// Check if user is already in the channel
+	_, err = a.GetChannelMember(channelToJoin.Id, userProfile.Id)
+	if err == nil {
+		return &model.CommandResponse{
+			Text: args.T("api.command_invite.user_already_in_channel.app_error", map[string]interface{}{
+				"User": userProfile.Username,
+			}),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if _, err := a.AddChannelMember(userProfile.Id, channelToJoin, args.UserId, ""); err != nil {
+		var text string
+		if err.Id == "api.channel.add_members.user_denied" {
+			text = args.T("api.command_invite.group_constrained_user_denied")
+		} else if err.Id == "store.sql_team.get_member.missing.app_error" ||
+			err.Id == "api.channel.add_user.to.channel.failed.deleted.app_error" {
+			text = args.T("api.command_invite.user_not_in_team.app_error", map[string]interface{}{
+				"Username": userProfile.Username,
+			})
+		} else {
+			text = args.T("api.command_invite.fail.app_error")
+		}
+		return &model.CommandResponse{
+			Text:         text,
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	if args.ChannelId != channelToJoin.Id {
+		return &model.CommandResponse{
+			Text: args.T("api.command_invite.success", map[string]interface{}{
+				"User":    userProfile.Username,
+				"Channel": channelToJoin.Name,
+			}),
+			ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL,
+		}
+	}
+
+	return &model.CommandResponse{}
+}