Guest accounts feature (#11428)

* MM-14139: Creating permissions for invite/promote/demote guests (#10778)

* MM-14139: Creating permissions for invite/promote/demote guests

* Fixing tests

* Adding invite guest api endpoint (#10792)

* Adding invite guest api endpoint

* Adding i18n

* Adding some tests

* WIP

* Migrating Token.Extra info to bigger size (2048)

* Fixing tests

* Adding client function for invite guests

* Adding send guests invites tests

* Renaming file from guest to guest_invite

* Adding Promote/Demote users from/to guest endpoints (#10791)

* Adding Promote/Demote users from/to guest endpoints

* Adding i18n translations

* Adding the client functions

* Using getQueryBuilder function

* Addressing PR review comments

* Adding default channels to users on promte from guest (#10851)

* Adding default channels to users on promte from guest

* Addressing PR review comments

* Fixing merge problems

* Sending websockets events on promote/demote (#11403)

* Sending websockets events on promote/demote

* Fixing merge problems

* Fixing govet shadowing problem

* Fixing feature branch tests

* Avoiding leaking users data through websockets for guest accounts (#11489)

* Avoiding leaking users data through websockets for guest accounts

* Adding tests and fixing code error

* Fixing i18n

* Allow to enable/disable guests and other extra config settings (#11481)

* Allow to enable/disable guests and other extra config settings

* Fixing tests and moving license and config validation to api level

* Update api4/role_test.go

Co-Authored-By: George Goldberg <george@gberg.me>

* Update api4/role_test.go

Co-Authored-By: George Goldberg <george@gberg.me>

* Fixing typo

* fixing tests

* Managing correctly the guest channel leave behavior (#11578)

* MM-15134: Removing guests from teams or system on leave channels if needed

* WIP

* No deactivating the guest user when leave the last team

* Adding a couple of tests

* Fixing shadow variables

* Fixing tests

* fixing tests

* fixing shadow variables

* Adding guest counts for channel stats (#11646)

* Adding guest counts for channel stats

* Adding tests

* Fixing tests

* Fixing guest domain restrictions (#11660)

* Adding needed migration for the database

* Fixing migration

app/command_leave.go

@@ -38,18 +38,41 @@ func (me *LeaveProvider) DoCommand(a *App, args *model.CommandArgs, message stri
 	if channel, noChannelErr = a.GetChannel(args.ChannelId); noChannelErr != nil {
 		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
 	}
-	if channel.Name == model.DEFAULT_CHANNEL {
-		return &model.CommandResponse{Text: args.T("api.channel.leave.default.app_error", map[string]interface{}{"Channel": model.DEFAULT_CHANNEL}), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
-	}
-	err := a.LeaveChannel(args.ChannelId, args.UserId)
-	if err != nil {
-		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
-	}
 
 	team, err := a.GetTeam(args.TeamId)
 	if err != nil {
 		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
 	}
 
+	err = a.LeaveChannel(args.ChannelId, args.UserId)
+	if err != nil {
+		if channel.Name == model.DEFAULT_CHANNEL {
+			return &model.CommandResponse{Text: args.T("api.channel.leave.default.app_error", map[string]interface{}{"Channel": model.DEFAULT_CHANNEL}), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+		}
+		return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	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.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+	}
+
+	if user.IsGuest() {
+		members, err := a.GetChannelMembersForUser(team.Id, args.UserId)
+		if err != nil || len(*members) == 0 {
+			return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+		}
+		channel, err := a.GetChannel((*members)[0].ChannelId)
+		if err != nil {
+			return &model.CommandResponse{Text: args.T("api.command_leave.fail.app_error"), ResponseType: model.COMMAND_RESPONSE_TYPE_EPHEMERAL}
+		}
+		return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + channel.Name}
+	}
+
 	return &model.CommandResponse{GotoLocation: args.SiteURL + "/" + team.Name + "/channels/" + model.DEFAULT_CHANNEL}
 }