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/app/slashcommands/command_leave.go

@@ -0,0 +1,80 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package slashcommands
+
+import (
+	"github.com/mattermost/mattermost-server/v6/model"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app"
+	"github.com/mattermost/mattermost-server/v6/server/channels/app/request"
+	"github.com/mattermost/mattermost-server/v6/server/platform/shared/i18n"
+)
+
+type LeaveProvider struct {
+}
+
+const (
+	CmdLeave = "leave"
+)
+
+func init() {
+	app.RegisterCommandProvider(&LeaveProvider{})
+}
+
+func (*LeaveProvider) GetTrigger() string {
+	return CmdLeave
+}
+
+func (*LeaveProvider) GetCommand(a *app.App, T i18n.TranslateFunc) *model.Command {
+	return &model.Command{
+		Trigger:          CmdLeave,
+		AutoComplete:     true,
+		AutoCompleteDesc: T("api.command_leave.desc"),
+		DisplayName:      T("api.command_leave.name"),
+	}
+}
+
+func (*LeaveProvider) DoCommand(a *app.App, c request.CTX, args *model.CommandArgs, message string) *model.CommandResponse {
+	var channel *model.Channel
+	var noChannelErr *model.AppError
+	if channel, noChannelErr = a.GetChannel(c, args.ChannelId); noChannelErr != nil {
+		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	team, err := a.GetTeam(args.TeamId)
+	if err != nil {
+		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	err = a.LeaveChannel(c, args.ChannelId, args.UserId)
+	if err != nil {
+		if channel.Name == model.DefaultChannelName {
+			return &model.CommandResponse{Text: args.T("api.channel.leave.default.app_error", map[string]any{"Channel": model.DefaultChannelName}), ResponseType: model.CommandResponseTypeEphemeral}
+		}
+		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	member, err := a.GetTeamMember(team.Id, args.UserId)
+	if err != nil || member.DeleteAt != 0 {
+		return &model.CommandResponse{GotoLocation: args.SiteURL + "/"}
+	}
+
+	user, err := a.GetUser(args.UserId)
+	if err != nil {
+		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+	}
+
+	if user.IsGuest() {
+		members, err := a.GetChannelMembersForUser(c, team.Id, args.UserId)
+		if err != nil || len(members) == 0 {
+			return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+		}
+		channel, err := a.GetChannel(c, members[0].ChannelId)
+		if err != nil {
+			return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.CommandResponseTypeEphemeral}
+		}
+		return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + channel.Name}
+	}
+
+	return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + model.DefaultChannelName}
+}