instance.AddMember("frontend", is_slack(m_config, id) ? "slack" : "xmpp", json.GetAllocator());

void APIServer::serve_instances_join_room(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);

	if (username.empty()) {

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

		return;

	}

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

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

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

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

	std::string response = server->send_command(instance, "join_room " +

		username + " " + name + " " + legacy_room + " " + legacy_server + " " + frontend_room);

	if (response.find("Joined the room") == std::string::npos) {

		send_ack(conn, true, response);

	}

	else {

		send_ack(conn, false, response);

	}

}

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

	// So far we support just Slack here. For XMPP, it is up to user to initiate the join room request.

	Document json;

	json.SetObject();

	json.AddMember("error", 0, json.GetAllocator());

	json.AddMember("name_label", "Nickname in 3rd-party room", json.GetAllocator());

	json.AddMember("legacy_room_label", "3rd-party room name", json.GetAllocator());

	json.AddMember("legacy_server_label", "3rd-party server", json.GetAllocator());

	json.AddMember("frontend_room_label", "Slack channel", json.GetAllocator());

	send_json(conn, json);

}

	else if (has_prefix(&hm->uri, "/api/v1/instances/join_room_form/")) {

		serve_instances_join_room_form(server, sess, conn, hm);

	}

	else if (has_prefix(&hm->uri, "/api/v1/instances/join_room/")) {

		serve_instances_join_room(server, sess, conn, hm);

	}

		void serve_instances_join_room(Server *server, Server::session *sess, struct mg_connection *conn, struct http_message *hm);

		void serve_instances_join_room_form(Server *server, Server::session *sess, struct mg_connection *conn, struct http_message *hm);

<!--#include virtual="/header.shtml" -->

<h2>Join room</h2>

<form action="/api/v1/instances/join_room" class="basic-grey" method="POST"> 

<h1>Join room

	<span id="description">Join the room using this Spectrum 2 instance.</span> 

</h1> 

<label> 

	<span id="name_desc"></span> 

	<input type="text" id="name" name="name" placeholder=""></textarea> 

</label> 

<label> 

	<span id="legacy_room_desc"></span> 

	<input type="text" id="legacy_room" name="legacy_name" placeholder=""></textarea> 

</label> 

<label>

	<span id="legacy_server_desc"></span> 

	<input type="text" id="legacy_server" name="legacy_server" placeholder=""></textarea> 

</label>

<label>

	<span id="frontend_room_desc"></span> 

	<input type="text" id="frontend_room" name="frontend_room" placeholder=""></textarea> 

</label>

<label> 

	<span>&nbsp;</span> 

	<input type="submit" class="button_command" value="Join room" />

</label> 

<input type="hidden" name="instance" id="instance" value=""></input> 

</form><br/>

<script type="text/javascript">

$(function() {

	fill_instances_join_room_form();

});

</script>

<!--#include virtual="/footer.shtml" -->

				row += '<td>';

				if (command == 'unregister' && instance.frontend == "slack") {

					row += '<a href="' + $.cookie("base_location") + 'instances/join_room.shtml?id=' + instance.id + '">Join room</a> | ';

				}

				row += '<a class="button_command" href="' + $.cookie("base_location") +  'api/v1/instances/' + command + '/' + instance.id + '">' + command + '</a>';

				row += '</td></tr>';

function fill_instances_join_room_form() {

	var query = getQueryParams(document.location.search);

	$("#instance").attr("value", query.id);

	$(".button_command").click(function(e) {

		e.preventDefault();

		$(this).parent().empty().progressbar( {value: false} ).css('height', '1em');

		var postdata ={

			"name": $("#name").val(),

			"legacy_room": $("#legacy_room").val(),

			"legacy_server": $("#legacy_server").val()

			"frontend_room": $("#frontend_room").val()

		};

		$.post($.cookie("base_location") + "api/v1/instances/join_room/" + $("#instance").val(), postdata, function(data) {

			window.location.replace("index.shtml");

		});

	})

	$.get($.cookie("base_location") + "api/v1/instances/join_room_form/" + query.id, function(data) {

		$("#name_desc").html(data.name_label + ":");

		$("#legacy_room_desc").html(data.legacy_room_label + ":");

		$("#legacy_server_desc").html(data.legacy_server_label + ":");

		$("#frontend_room_desc").html(data.frontend_room_desc + ":");

		$("#name").attr("placeholder", data.name_label + ":");

		$("#legacy_room").attr("placeholder", data.legacy_room_label + ":");

		$("#legacy_server").attr("placeholder", data.legacy_server_label + ":");

		$("#frontend_room").attr("placeholder", data.frontend_room_desc + ":");

	});

}