Chat-O-Matic/application/Server.cpp

/*
 * Copyright 2009-2011, Andrea Anzani. All rights reserved.
 * Copyright 2009-2011, Pier Luigi Fiorini. All rights reserved.
 * Copyright 2021, Jaidyn Levesque. All rights reserved.
 * Distributed under the terms of the MIT License.
 *
 * Authors:
 *		Andrea Anzani, andrea.anzani@gmail.com
 *		Pier Luigi Fiorini, pierluigi.fiorini@gmail.com
 *		Jaidyn Levesque, jadedctrl@teknik.io
 *
 * Contributors:
 *		Dario Casalinuovo
 */

#include "Server.h"

#include <Application.h>
#include <Debug.h>
#include <Entry.h>
#include <Notification.h>
#include <Path.h>
#include <StringList.h>
#include <TranslationUtils.h>

#include "Account.h"
#include "AccountManager.h"
#include "CayaMessages.h"
#include "CayaProtocol.h"
#include "CayaPreferences.h"
#include "CayaProtocolMessages.h"
#include "CayaUtils.h"
#include "DefaultItems.h"
#include "ImageCache.h"
#include "InviteDialogue.h"
#include "ProtocolLooper.h"
#include "ProtocolManager.h"
#include "RoomFlags.h"
#include "RosterItem.h"
#include "UserInfoWindow.h"


Server::Server()
	:
	BMessageFilter(B_ANY_DELIVERY, B_ANY_SOURCE)
{
}


void
Server::Quit()
{
	for (int i = 0; i < fLoopers.CountItems(); i++)
		RemoveProtocolLooper(fLoopers.KeyAt(i));
}


void
Server::LoginAll()
{
	for (uint32 i = 0; i < fLoopers.CountItems(); i++) {
		ProtocolLooper* looper = fLoopers.ValueAt(i);

		BMessage* msg = new BMessage(IM_MESSAGE);
		msg->AddInt32("im_what", IM_SET_OWN_STATUS);
		msg->AddInt32("status", CAYA_ONLINE);
		looper->PostMessage(msg);
	}
}


filter_result
Server::Filter(BMessage* message, BHandler **target)
{
	filter_result result = B_DISPATCH_MESSAGE;

	switch (message->what) {
		case CAYA_CLOSE_CHAT_WINDOW:
		{
			BString id = message->FindString("chat_id");
			if (id.Length() > 0) {
				bool found = false;
//				Conversation* item = fChatMap.ValueFor(id, &found);
			}
			result = B_SKIP_MESSAGE;
			break;
		}
		case IM_MESSAGE:
			result = ImMessage(message);
			break;

		case CAYA_REPLICANT_MESSENGER:
		{
			BMessenger* messenger = new BMessenger();

			status_t ret = message->FindMessenger(
				"messenger", messenger);

			if (ret != B_OK || !messenger->IsValid()) {
				printf("err %s\n", strerror(ret));
				break;
			}
			AccountManager* accountManager = AccountManager::Get();
			accountManager->SetReplicantMessenger(messenger);
			accountManager->ReplicantStatusNotify(accountManager->Status());
			break;
		}

		case CAYA_DISABLE_ACCOUNT:
		{
			int64 instance = 0;
			if (message->FindInt64("instance", &instance) != B_OK) {
				result = B_SKIP_MESSAGE;
				break;
			}
			RemoveProtocolLooper(instance);
			break;
		}

		case CAYA_USER_INFO:
		{
			User* user = _EnsureUser(message);
			if (user != NULL) {
				UserInfoWindow* win = new UserInfoWindow(user);
				win->Show();
			}
			break;
		}

		case CAYA_REQUEST_HELP:
		{
			BString body;
			BString cmd_name = message->FindString("misc_str");
			int64 instance = message->FindInt64("instance");
			Conversation* chat = _EnsureConversation(message);

			if (chat == NULL)
				break;

			if (cmd_name.IsEmpty() == false) {
				ChatCommand* cmd = CommandById(cmd_name, instance);
				if (cmd == NULL)
					body = "-- That command doesn't exist. Try '/help' for a "
						   "list.\n";
				else {
					body = "** ";
					body << cmd->GetName() << " ― " << cmd->GetDesc() << "\n";
				}
			}
			else {
				CommandMap combinedCmds;
				combinedCmds.AddList(fCommands);
				combinedCmds.AddList(chat->GetProtocolLooper()->Commands());

				body << "** Commands: ";
				for (int i = 0; i < combinedCmds.CountItems(); i++) {
					ChatCommand* cmd = combinedCmds.ValueAt(i);
					if (i > 0)	body << ", ";
					body << cmd->GetName();
				}
				body << "\n";
			}
			BMessage* help = new BMessage(IM_MESSAGE);
			help->AddInt32("im_what", IM_MESSAGE_RECEIVED);
			help->AddString("body", body);
			help->AddInt64("when", 0);
			chat->ImMessage(help);
			break;
		}

		default:
			// Dispatch not handled messages to main window
			break;
	}

	return result;
}


filter_result
Server::ImMessage(BMessage* msg)
{
	filter_result result = B_DISPATCH_MESSAGE;
	int32 im_what = msg->FindInt32("im_what");

	switch (im_what) {
		case IM_CONTACT_LIST:
		{
			int i = 0;
			BString id;
			while (msg->FindString("user_id", i++, &id) == B_OK)
				_EnsureContact(msg);
			result = B_SKIP_MESSAGE;
			break;
		}
		case IM_OWN_STATUS_SET:
		{
			int32 status;
			const char* protocol;
			if (msg->FindInt32("status", &status) != B_OK)
				return B_SKIP_MESSAGE;
			if (msg->FindString("protocol", &protocol) != B_OK)
				return B_SKIP_MESSAGE;

			AccountManager* accountManager = AccountManager::Get();
			accountManager->SetStatus((CayaStatus)status);

			break;
		}
		case IM_STATUS_SET:
		{
			int32 status;

			if (msg->FindInt32("status", &status) != B_OK)
				return B_SKIP_MESSAGE;

			User* user = _EnsureUser(msg);
			if (!user)
				break;

			user->SetNotifyStatus((CayaStatus)status);
			BString statusMsg;
			if (msg->FindString("message", &statusMsg) == B_OK) {
				user->SetNotifyPersonalStatus(statusMsg);
			}
			break;
		}
		case IM_OWN_CONTACT_INFO:
		{
			Contact* contact = _EnsureContact(msg);
			if (contact != NULL) {
				contact->GetProtocolLooper()->SetOwnId(contact->GetId());
			}
			break;
		}
		case IM_CONTACT_INFO:
		{
			Contact* contact = _EnsureContact(msg);
			if (!contact)
				break;

			const char* name = NULL;

			if ((msg->FindString("user_name", &name) == B_OK)
				&& (strcmp(name, "") != 0))
				contact->SetNotifyName(name);

			BString status;
			if (msg->FindString("message", &status) == B_OK)
				contact->SetNotifyPersonalStatus(status);
			break;
		}
		case IM_EXTENDED_CONTACT_INFO:
		{
			Contact* contact = _EnsureContact(msg);
			if (!contact)
				break;

			if (contact->GetName().Length() > 0)
				break;

			const char* name = NULL;

			if ((msg->FindString("full_name", &name) == B_OK)
				&& (strcmp(name, "") != 0))
				contact->SetNotifyName(name);
			else if ((msg->FindString("user_name", &name) == B_OK)
				&& (strcmp(name, "") != 0))
					contact->SetNotifyName(name);
			break;
		}
		case IM_AVATAR_SET:
		{
			User* user = _EnsureUser(msg);
			if (!user)
				break;

			entry_ref ref;

			if (msg->FindRef("ref", &ref) == B_OK) {
				BBitmap* bitmap = BTranslationUtils::GetBitmap(&ref);
				user->SetNotifyAvatarBitmap(bitmap);
			} else
				user->SetNotifyAvatarBitmap(NULL);
			break;
		}
		case IM_CREATE_CHAT:
		{
			BString user_id = msg->FindString("user_id");
			if (user_id.IsEmpty() == false) {
				User* user = ContactById(user_id, msg->FindInt64("instance"));
				user->GetProtocolLooper()->PostMessage(msg);
			}
			break;
		}
		case IM_CHAT_CREATED:
		{
			Conversation* chat = _EnsureConversation(msg);
			User* user = _EnsureUser(msg);

			if (chat != NULL && user != NULL) {
				chat->AddUser(user);
				chat->ShowView(false, true);
			}

			break;
		}
		case IM_JOIN_ROOM:
		{
			SendProtocolMessage(msg);
			break;
		}
		case IM_ROOM_CREATED:
		case IM_ROOM_JOINED:
		{
			_EnsureConversation(msg);
			break;
		}
		case IM_ROOM_PARTICIPANTS:
		{
			Conversation* chat = _EnsureConversation(msg);
			BStringList ids;
			BStringList name;

			msg->FindStrings("user_name", &name);
			if (msg->FindStrings("user_id", &ids) != B_OK)
				break;

			ProtocolLooper* protoLooper = _LooperFromMessage(msg);

			for (int i = 0; i < ids.CountStrings(); i++) {
				User* user = _EnsureUser(ids.StringAt(i), protoLooper);

				if (name.CountStrings() >= i) {
					user->SetNotifyName(name.StringAt(i));
				}
				chat->AddUser(user);
			}
			break;
		}
		case IM_ROOM_PARTICIPANT_JOINED:
		case IM_ROOM_PARTICIPANT_LEFT:
		case IM_ROOM_PARTICIPANT_BANNED:
		case IM_ROOM_PARTICIPANT_KICKED:
		{
			Conversation* chat = _EnsureConversation(msg);
			if (chat == NULL)
				break;
			chat->ImMessage(msg);
			break;
		}
		case IM_ROOM_METADATA:
		{
			Conversation* chat = _EnsureConversation(msg);
			if (chat != NULL)
				chat->ImMessage(msg);
			break;
		}
		case IM_ROOM_ROLECHANGED:
		{
			Conversation* chat = _EnsureConversation(msg);
			BString user_id;
			Role* role = _GetRole(msg);

			if (chat == NULL || msg->FindString("user_id", &user_id) != B_OK
				|| role == NULL)
				break;

			chat->SetRole(user_id, role);
			break;
		}
		case IM_ROOM_NAME_SET:
		{
			BString name;
			Conversation* chat = _EnsureConversation(msg);
			if (msg->FindString("chat_name", &name) != B_OK || chat == NULL)
				break;

			chat->SetNotifyName(name.String());
			break;
		}
		case IM_ROOM_SUBJECT_SET:
		{
			BString subject;
			Conversation* chat = _EnsureConversation(msg);
			if (msg->FindString("subject", &subject) != B_OK || chat == NULL)
				break;

			chat->SetNotifySubject(subject.String());
			break;
		}
		case IM_SEND_MESSAGE:
		{
			// Route this message through the appropriate ProtocolLooper
			Conversation* conversation = _EnsureConversation(msg);
			if (conversation->GetProtocolLooper())
				conversation->GetProtocolLooper()->PostMessage(msg);
			break;
		}
		case IM_MESSAGE_SENT:
		case IM_MESSAGE_RECEIVED:
		{
			Conversation* item = _EnsureConversation(msg);
			item->ImMessage(msg);

			break;
		}
		case IM_ROOM_INVITE_RECEIVED:
		{
			BString chat_id;
			User* user = _EnsureUser(msg);
			BString user_id = msg->FindString("user_id");
			BString user_name = user_id;
			BString chat_name = msg->FindString("chat_name");
			BString body = msg->FindString("body");
			ProtocolLooper* looper = _LooperFromMessage(msg);

			if (msg->FindString("chat_id", &chat_id) != B_OK || looper == NULL)
			{
				result = B_SKIP_MESSAGE;
				break;
			}

			if (chat_name.IsEmpty() == true)
				chat_name = chat_id;

			if (user != NULL)
				user_name = user->GetName();

			BString alertBody("You've been invited to %room%.");
			if (user_id.IsEmpty() == false)
				alertBody = "%user% has invited you to %room%.";
			if (body.IsEmpty() == false)
				alertBody << "\n\n\"%body%\"";

			alertBody.ReplaceAll("%user%", user_name);
			alertBody.ReplaceAll("%room%", chat_name);
			alertBody.ReplaceAll("%body%", body);

			BMessage* accept = new BMessage(IM_MESSAGE);
			accept->AddInt32("im_what", IM_ROOM_INVITE_ACCEPT);
			accept->AddString("chat_id", chat_id);
			BMessage* reject = new BMessage(IM_MESSAGE);
			accept->AddInt32("im_what", IM_ROOM_INVITE_REFUSE);
			reject->AddString("chat_id", chat_id);

			InviteDialogue* invite = new InviteDialogue(BMessenger(looper),
										"Invitation received",
										alertBody.String(), accept, reject);
			invite->Go();
			break;
		}
		case IM_USER_STARTED_TYPING:
		case IM_USER_STOPPED_TYPING:
		{
//			User* user = _EnsureUser();
//			Conversation* chat = _EnsureConversation();
			result = B_SKIP_MESSAGE;
			break;
		}
		case IM_PROGRESS:
		{
			const char* protocol = NULL;
			const char* title = NULL;
			const char* message = NULL;
			float progress = 0.0f;

			if (msg->FindString("protocol", &protocol) != B_OK)
				return result;
			if (msg->FindString("title", &title) != B_OK)
				return result;
			if (msg->FindString("message", &message) != B_OK)
				return result;
			if (msg->FindFloat("progress", &progress) != B_OK)
				return result;

			if (!CayaPreferences::Item()->NotifyProtocolStatus)
				break;

			CayaProtocolAddOn* addOn
				= ProtocolManager::Get()->ProtocolAddOn(protocol);

			BNotification notification(B_PROGRESS_NOTIFICATION);
			notification.SetGroup(BString("Caya"));
			notification.SetTitle(title);
			notification.SetIcon(addOn->ProtoIcon());
			notification.SetContent(message);
			notification.SetProgress(progress);
			notification.Send();

			break;
		}
		case IM_NOTIFICATION:
		{
			int32 type = (int32)B_INFORMATION_NOTIFICATION;
			const char* protocol = NULL;
			const char* title = NULL;
			const char* message = NULL;

			if (msg->FindString("protocol", &protocol) != B_OK)
				return result;
			if (msg->FindInt32("type", &type) != B_OK)
				return result;
			if (msg->FindString("title", &title) != B_OK)
				return result;
			if (msg->FindString("message", &message) != B_OK)
				return result;

			if (!CayaPreferences::Item()->NotifyProtocolStatus)
				break;

			CayaProtocolAddOn* addOn
				= ProtocolManager::Get()->ProtocolAddOn(protocol);

			BNotification notification((notification_type)type);
			notification.SetGroup(BString("Caya"));
			notification.SetTitle(title);
			notification.SetIcon(addOn->ProtoIcon());
			notification.SetContent(message);
			notification.Send();

			break;
		}
		case IM_REGISTER_COMMAND:
		{
			ChatCommand* cmd = new ChatCommand(msg);
			if (cmd == NULL)	break;

			ProtocolLooper* looper = _LooperFromMessage(msg);
			if (looper == NULL)
				fCommands.AddItem(cmd->GetName(), cmd);
			else
				looper->AddCommand(cmd);
			break;
		}
		case IM_REGISTER_USERLIST_ITEM:
		{
			ProtocolLooper* looper = _LooperFromMessage(msg);
			if (looper == NULL)
				fUserItems.AddItem(new BMessage(*msg));
			else
				looper->AddUserPopUpItem(new BMessage(*msg));
			break;
		}
		case IM_REGISTER_CHATLIST_ITEM:
		{
			ProtocolLooper* looper = _LooperFromMessage(msg);
			if (looper == NULL)
				fChatItems.AddItem(new BMessage(*msg));
			else
				looper->AddChatPopUpItem(new BMessage(*msg));
			break;
		}
		case IM_REGISTER_MENUBAR_ITEM:
		{
			ProtocolLooper* looper = _LooperFromMessage(msg);
			if (looper != NULL)
				looper->AddMenuBarItem(new BMessage(*msg));
			break;
		}
		case IM_PROTOCOL_READY:
		{
			// Ready notification
			ProtocolLooper* looper = _LooperFromMessage(msg);
			if (looper == NULL)
				break;
			CayaProtocol* proto = looper->Protocol();

			BString content("%user% has connected!");
			content.ReplaceAll("%user%", looper->Protocol()->GetName());

			BNotification notification(B_INFORMATION_NOTIFICATION);
			notification.SetGroup(BString("Caya"));
			notification.SetTitle("Connected");
			notification.SetContent(content);
			notification.SetIcon(proto->Icon());
			notification.Send();

			// Join cached rooms
			BEntry entry;
			char fileName[B_FILE_NAME_LENGTH] = {'\0'};
			BDirectory dir(CayaRoomsCachePath(proto->GetName()));

			while (dir.GetNextEntry(&entry, true) == B_OK)
				if (entry.GetName(fileName) == B_OK) {
					int32 flags;
					BFile file(&entry, B_READ_ONLY);
					if (file.InitCheck() != B_OK)
						continue;

					if (file.ReadAttr("Caya:flags", B_INT32_TYPE, 0, &flags,
							sizeof(int32)) < 0)
						continue;

					if (!(flags & ROOM_AUTOJOIN) && !(flags & ROOM_AUTOCREATE))
						continue;

					BMessage join(IM_MESSAGE);
					int32 im_what = IM_JOIN_ROOM;
					if (flags & ROOM_AUTOCREATE) {
						im_what = IM_CREATE_CHAT;
						join.AddString("user_id", fileName);
					}
					join.AddInt32("im_what", im_what);
					join.AddString("chat_id", fileName);
					looper->PostMessage(&join);
				}
			break;
		}

		default:
			break;
	}

	return result;
}


void
Server::AddProtocolLooper(bigtime_t instanceId, CayaProtocol* cayap)
{
	ProtocolLooper* looper = new ProtocolLooper(cayap, instanceId);
	fLoopers.AddItem(instanceId, looper);
	fAccounts.AddItem(cayap->GetName(), instanceId);
}


void
Server::RemoveProtocolLooper(bigtime_t instanceId)
{
	ProtocolLooper* looper = GetProtocolLooper(instanceId);
	if (looper == NULL)
		return;

	ChatMap chats = looper->Conversations();
	for (int i = 0; i < chats.CountItems(); i++)
		delete chats.ValueAt(i);

	UserMap users = looper->Users();
	for (int i = 0; i < users.CountItems(); i++)
		delete users.ValueAt(i);

	fLoopers.RemoveItemFor(instanceId);
	fAccounts.RemoveItemFor(looper->Protocol()->GetName());
	looper->Lock();
	looper->Quit();
}


ProtocolLooper*
Server::GetProtocolLooper(bigtime_t instanceId)
{
	bool found = false;
	return fLoopers.ValueFor(instanceId, &found);
}


AccountInstances
Server::GetAccounts()
{
	return fAccounts;
}


void
Server::SendProtocolMessage(BMessage* msg)
{
	// Skip null messages
	if (!msg)
		return;

	// Check if message contains the instance field
	bigtime_t id;
	if (msg->FindInt64("instance", &id) == B_OK) {
		bool found = false;
		ProtocolLooper* looper
			= fLoopers.ValueFor(id, &found);

		if (found)
			looper->PostMessage(msg);
	}
}
 

void
Server::SendAllProtocolMessage(BMessage* msg)
{
	// Skip null messages
	if (!msg)
		return;

	// Send message to all protocols
	for (uint32 i = 0; i < fLoopers.CountItems(); i++) {
		ProtocolLooper* looper = fLoopers.ValueAt(i);
		looper->PostMessage(msg);
	}
}


RosterMap
Server::Contacts() const
{
	RosterMap contacts;

	for (int i = 0; i < fAccounts.CountItems(); i++) {
		ProtocolLooper* fruitLoop = fLoopers.ValueFor(fAccounts.ValueAt(i));
		if (fruitLoop == NULL)	continue;
		contacts.AddList(fruitLoop->Contacts());
	}

	return contacts;
}


Contact*
Server::ContactById(BString id, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	Contact* result = NULL;
	if (looper != NULL)
		result = looper->ContactById(id);
	return result;
}


void
Server::AddContact(Contact* contact, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	if (looper != NULL)
		looper->AddContact(contact);
}


UserMap
Server::Users() const
{
	UserMap users;
	for (int i = 0; i < fAccounts.CountItems(); i++) {
		ProtocolLooper* fruitLoop = fLoopers.ValueFor(fAccounts.ValueAt(i));
		if (fruitLoop == NULL)	continue;
		users.AddList(fruitLoop->Users());
	}

	return users;
}


User*
Server::UserById(BString id, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	User* result = NULL;
	if (looper != NULL)
		result = looper->UserById(id);
	return result;
}


void
Server::AddUser(User* user, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	if (looper != NULL)
		looper->AddUser(user);
}


ChatMap
Server::Conversations() const
{
	ChatMap chats;

	for (int i = 0; i < fAccounts.CountItems(); i++) {
		ProtocolLooper* fruitLoop = fLoopers.ValueFor(fAccounts.ValueAt(i));
		if (fruitLoop == NULL)	continue;
		chats.AddList(fruitLoop->Conversations());
	}

	return chats;
}


Conversation*
Server::ConversationById(BString id, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	Conversation* result = NULL;
	if (looper != NULL)
		result = looper->ConversationById(id);
	return result;
}


void
Server::AddConversation(Conversation* chat, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	if (looper != NULL)
		looper->AddConversation(chat);
}


ChatCommand*
Server::CommandById(BString id, int64 instance)
{
	ProtocolLooper* looper = fLoopers.ValueFor(instance);
	ChatCommand* result = NULL;
	if (looper != NULL)
		result = looper->CommandById(id);
	if (result == NULL)
		result = fCommands.ValueFor(id);
	return result;
}


BObjectList<BMessage>
Server::ChatPopUpItems()
{
	return fChatItems;
}


BObjectList<BMessage>
Server::UserPopUpItems()
{
	return fUserItems;
}


ProtocolLooper*
Server::_LooperFromMessage(BMessage* message)
{
	if (!message)
		return NULL;

	bigtime_t identifier;

	if (message->FindInt64("instance", &identifier) == B_OK) {
		bool found = false;

		ProtocolLooper* looper = fLoopers.ValueFor(identifier, &found);
		if (found)
			return looper;
	}

	return NULL;
}


Contact*
Server::_EnsureContact(BMessage* message)
{
	BString id = message->FindString("user_id");
	ProtocolLooper* looper = _LooperFromMessage(message);
	if (looper == NULL) return NULL;

	Contact* contact = looper->ContactById(id);

	if (contact == NULL && id.IsEmpty() == false && looper != NULL) {
		contact = new Contact(id, Looper());
		contact->SetProtocolLooper(looper);
		looper->AddContact(contact);
	}

	return contact;
}


User*
Server::_EnsureUser(BMessage* message)
{
	BString id = message->FindString("user_id");
	return _EnsureUser(id, _LooperFromMessage(message));
}


User*
Server::_EnsureUser(BString id, ProtocolLooper* protoLooper)
{
	User* user = protoLooper->UserById(id);

	if (user == NULL && id.IsEmpty() == false) {
		user = new User(id, Looper());
		user->SetProtocolLooper(protoLooper);
		protoLooper->AddUser(user);
	}

	return user;
}


Conversation*
Server::_EnsureConversation(BMessage* message)
{
	ProtocolLooper* looper;
	if (!message || (looper = _LooperFromMessage(message)) == NULL)
		return NULL;

	BString chat_id = message->FindString("chat_id");
	Conversation* item = NULL;

	if (chat_id.IsEmpty() == false) {
		item = looper->ConversationById(chat_id);

		if (item == NULL) {
			item = new Conversation(chat_id, Looper());
			item->SetProtocolLooper(looper);
			item->AddUser(looper->ContactById(looper->GetOwnId()));
			looper->AddConversation(item);

			BMessage meta(IM_MESSAGE);
			meta.AddInt32("im_what", IM_GET_ROOM_METADATA);
			meta.AddString("chat_id", chat_id);

			BMessage users(IM_MESSAGE);
			users.AddInt32("im_what", IM_GET_ROOM_PARTICIPANTS);
			users.AddString("chat_id", chat_id);

			looper->MessageReceived(&meta);
			looper->MessageReceived(&users);
		}
	}
	return item;
}


Role*
Server::_GetRole(BMessage* msg)
{
	if (!msg)
		return NULL;

	BString title;
	int32 perms;
	int32 priority;

	if (msg->FindString("role_title", &title) != B_OK
		|| msg->FindInt32("role_perms", &perms) != B_OK
		|| msg->FindInt32("role_priority", &priority) != B_OK)
		return NULL;

	return new Role(title, perms, priority);
}