-- Copyright (C) 2010 Florian Zeitz

--

-- This file is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

-- <session xmlns="http://prosody.im/streams/c2s" jid="alice@example.com/brussels">

--   <encrypted/>

--   <compressed/>

-- </session>

-- <session xmlns="http://prosody.im/streams/s2s" jid="example.com">

--   <encrypted/>

--   <compressed/>

--   <in/> / <out/>

-- </session>

local stanza = require "util.stanza";

local uuid_generate = require "util.uuid".generate;

local httpserver = require "net.httpserver";

local lfs = require "lfs";

local open = io.open;

local stat = lfs.attributes;

local host = module:get_host();

local service = config.get("*", "core", "webadmin_pubsub_host") or ("pubsub." .. host);

local http_base = (prosody.paths.plugins or "./plugins/") .. "admin_web/www_files";

local xmlns_c2s_session = "http://prosody.im/streams/c2s";

local xmlns_s2s_session = "http://prosody.im/streams/s2s";

local response_400 = { status = "400 Bad Request", body = "<h1>Bad Request</h1>Sorry, we didn't understand your request :(" };

local response_403 = { status = "403 Forbidden", body = "<h1>Forbidden</h1>You don't have permission to view the contents of this directory :(" };

local response_404 = { status = "404 Not Found", body = "<h1>Page Not Found</h1>Sorry, we couldn't find what you were looking for :(" };

local mime_map = {

	html = "text/html";

	xml = "text/xml";

	js = "text/javascript";

	css = "text/css";

};

local idmap = {};

function add_client(session)

	local name = session.full_jid;

	local id = idmap[name];

	if not id then

		id = uuid_generate();

		idmap[name] = id;

	end

	local item = stanza.stanza("item", { id = id }):tag("session", {xmlns = xmlns_c2s_session, jid = name}):up();

	if session.secure then

		item:tag("encrypted"):up();

	end

	if session.compressed then

		item:tag("compressed"):up();

	end

	hosts[service].modules.pubsub.service:publish(xmlns_c2s_session, service, id, item);

	module:log("debug", "Added client " .. name);

end

function del_client(session)

	local name = session.full_jid;

	local id = idmap[name];

	if id then

		local notifier = stanza.stanza("retract", { id = id });

		hosts[service].modules.pubsub.service:retract(xmlns_c2s_session, service, id, notifier);

	end

end

function add_host(session, type)

	local name = (type == "out" and session.to_host) or (type == "in" and session.from_host);

	local id = idmap[name.."_"..type];

	if not id then

		id = uuid_generate();

		idmap[name.."_"..type] = id;

	end

	local item = stanza.stanza("item", { id = id }):tag("session", {xmlns = xmlns_s2s_session, jid = name})

		:tag(type):up();

	if session.secure then

		item:tag("encrypted"):up();

	end

	if session.compressed then

		item:tag("compressed"):up();

	end

	hosts[service].modules.pubsub.service:publish(xmlns_s2s_session, service, id, item);

	module:log("debug", "Added host " .. name .. " s2s" .. type);

end

function del_host(session, type)

	local name = (type == "out" and session.to_host) or (type == "in" and session.from_host);

	local id = idmap[name.."_"..type];

	if id then

		local notifier = stanza.stanza("retract", { id = id });

		hosts[service].modules.pubsub.service:retract(xmlns_s2s_session, service, id, notifier);

	end

end

local function preprocess_path(path)

	if path:sub(1,1) ~= "/" then

		path = "/"..path;

	end

	local level = 0;

	for component in path:gmatch("([^/]+)/") do

		if component == ".." then

			level = level - 1;

		elseif component ~= "." then

			level = level + 1;

		end

		if level < 0 then

			return nil;

		end

	end

	return path;

end

function serve_file(path)

	local full_path = http_base..path;

	if stat(full_path, "mode") == "directory" then

		if stat(full_path.."/index.html", "mode") == "file" then

			return serve_file(path.."/index.html");

		end

		return response_403;

	end

	local f, err = open(full_path, "rb");

	if not f then return response_404; end

	local data = f:read("*a");

	data = data:gsub("%%PUBSUBHOST%%", service);

	f:close();

	if not data then

		return response_403;

	end

	local ext = path:match("%.([^.]*)$");

	local mime = mime_map[ext]; -- Content-Type should be nil when not known

	return {

		headers = { ["Content-Type"] = mime; };

		body = data;

	};

end

local function handle_file_request(method, body, request)

	local path = preprocess_path(request.url.path);

	if not path then return response_400; end

	path = path:gsub("^/[^/]+", ""); -- Strip /admin/

	return serve_file(path);

end

function module.load()

	local host_session = prosody.hosts[host];

	local http_conf = config.get("*", "core", "webadmin_http_ports");

	if not select(2, hosts[service].modules.pubsub.service:get_nodes(service))[xmlns_s2s_session] then

		local ok, errmsg = hosts[service].modules.pubsub.service:create(xmlns_s2s_session, service);

		if not ok then

			module:log("warn", "Could not create node " .. xmlns_s2s_session .. ": " .. tostring(errmsg));

		end

	end

	for remotehost, session in pairs(host_session.s2sout) do

		if session.type ~= "s2sout_unauthed" then

			add_host(session, "out");

		end

	end

	for session in pairs(incoming_s2s) do

		if session.to_host == host then

			add_host(session, "in");

		end

	end

	if not select(2, hosts[service].modules.pubsub.service:get_nodes(service))[xmlns_c2s_session] then

		local ok, errmsg = hosts[service].modules.pubsub.service:create(xmlns_c2s_session, service);

		if not ok then

			module:log("warn", "Could not create node " .. xmlns_c2s_session .. ": " .. tostring(errmsg));

		end

	end

	for username, user in pairs(host_session.sessions or {}) do

		for resource, session in pairs(user.sessions or {}) do

			add_client(session);

		end

	end

module:hook("resource-bind", function(event)

	add_client(event.session);

end);

module:hook("resource-unbind", function(event)

	del_client(event.session);

end);

module:hook("s2sout-established", function(event)

	add_host(event.session, "out");

end);

module:hook("s2sin-established", function(event)

	add_host(event.session, "in");

end);

module:hook("s2sout-destroyed", function(event)

	del_host(event.session, "out");

end);

module:hook("s2sin-destroyed", function(event)

	del_host(event.session, "in");

end);