}

	else {

		send_ack(conn, true, "You are not registered to this Spectrum 2 instance.");

	}

}

void APIServer::serve_instances_register(Server *server, Server::session *session, struct mg_connection *conn, struct http_message *hm) {

	std::string uri(hm->uri.p, hm->uri.len);

	std::string instance = uri.substr(uri.rfind("/") + 1);

	UserInfo info;

	m_storage->getUser(session->user, info);

	std::string username = "";

	int type = (int) TYPE_STRING;

	m_storage->getUserSetting(info.id, instance, type, username);

	std::string jid = get_http_var(hm, "jid");

	std::string uin = get_http_var(hm, "uin");

	std::string password = get_http_var(hm, "password");

	// For some networks like IRC, there is no registration.

	// We detect such networks according to registration_fields and use

	// "unknown" uin for them.

		std::string response = server->send_command(instance, "registration_fields");

		std::vector<std::string> fields;

		boost::split(fields, response, boost::is_any_of("\n"));

		if (fields.size() == 1) {

			uin = "unknown";

		}

	}

		send_ack(conn, true, "Insufficient data.");

	}

	else {

		// Check if the frontend wants to use OAuth2 (Slack for example).

		std::string response = server->send_command(instance, "get_oauth2_url " + jid + " " + uin + " " + password);

		if (!response.empty()) {

			Document json;

			json.SetObject();

			json.AddMember("error", false, json.GetAllocator());

			json.AddMember("oauth2_url", response.c_str(), json.GetAllocator());

			send_json(conn, json);

		}

		else {

			response = server->send_command(instance, "register " + jid + " " + uin + " " + password);

			if (!response.empty()) {

				std::string value = jid;

				int type = (int) TYPE_STRING;

				m_storage->updateUserSetting(info.id, instance, value);

			}

			else {

				send_ack(conn, true, response);

				return;

			}

		}