-- 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 st = require "util.stanza";

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

local is_admin = require "usermanager".is_admin;

local pubsub = require "util.pubsub";

local httpserver = require "net.httpserver";

local jid_bare = require "util.jid".bare;

local lfs = require "lfs";

local open = io.open;

local stat = lfs.attributes;

module:set_global();

local service = {};

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

local xmlns_adminsub = "http://prosody.im/adminsub";

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

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

local response_301 = { status = "301 Moved Permanently" };

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, host)

	local name = session.full_jid;

	local id = idmap[name];

	if not id then

		id = uuid_generate();

		idmap[name] = id;

	end

	local item = st.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

	service[host]:publish(xmlns_c2s_session, host, id, item);

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

end

function del_client(session, host)

	local name = session.full_jid;

	local id = idmap[name];

	if id then

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

		service[host]:retract(xmlns_c2s_session, host, id, notifier);

	end

end

function add_host(session, type, host)

	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 = st.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

	service[host]:publish(xmlns_s2s_session, host, id, item);

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

end

function del_host(session, type, host)

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

		service[host]:retract(xmlns_s2s_session, host, 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, base)

	local full_path = http_base..path;

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

		if not path:find("/$") then

			local response = response_301;

			response.headers = { ["Location"] = base .. "/" };

			return response;

		end

		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");

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

	return serve_file(path_stripped, path);

end

function module.load()

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

	httpserver.new_from_config(http_conf, handle_file_request, { base = "admin" });

end

prosody.events.add_handler("server-started", function ()

	for host_name, host_table in pairs(hosts) do

		service[host_name] = pubsub.new({

			broadcaster = function(node, jids, item) return simple_broadcast(node, jids, item, host_name) end;

			normalize_jid = jid_bare;

			get_affiliation = function(jid) return get_affiliation(jid, host_name) end;

			capabilities = {

				member = {

					create = false;

					publish = false;

					retract = false;

					get_nodes = true;

					subscribe = true;

					unsubscribe = true;

					get_subscription = true;

					get_subscriptions = true;

					get_items = true;

					subscribe_other = false;

					unsubscribe_other = false;

					get_subscription_other = false;

					get_subscriptions_other = false;

					be_subscribed = true;

					be_unsubscribed = true;

					set_affiliation = false;

				};

				owner = {

					create = true;

					publish = true;

					retract = true;

					get_nodes = true;

					subscribe = true;

					unsubscribe = true;

					get_subscription = true;

					get_subscriptions = true;

					get_items = true;

					subscribe_other = true;

					unsubscribe_other = true;

					get_subscription_other = true;

					get_subscriptions_other = true;

					be_subscribed = true;

					be_unsubscribed = true;

					set_affiliation = true;

				};

			};

		});

		if not select(2, service[host_name]:get_nodes(true))[xmlns_s2s_session] then

			local ok, errmsg = service[host_name]:create(xmlns_s2s_session, true);

			if not ok then

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

			else

				service[host_name]:set_affiliation(xmlns_s2s_session, true, host_name, "owner")

			end

		end

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

			if session.type ~= "s2sout_unauthed" then

				add_host(session, "out", host_name);

			end

		end

		for session in pairs(incoming_s2s) do

			if session.to_host == host_name then

				add_host(session, "in", host_name);

			end

		end

		if not select(2, service[host_name]:get_nodes(true))[xmlns_c2s_session] then

			local ok, errmsg = service[host_name]:create(xmlns_c2s_session, true);

			if not ok then

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

			else

				service[host_name]:set_affiliation(xmlns_c2s_session, true, host_name, "owner")

			end

		end

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

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

				add_client(session, host_name);

			end

		end

		host_table.events.add_handler("iq/host/http://prosody.im/adminsub:adminsub", function(event)

			local origin, stanza = event.origin, event.stanza;

			local adminsub = stanza.tags[1];

			local action = adminsub.tags[1];

			local reply;

			if action.name == "subscribe" then

				local ok, ret = service[host_name]:add_subscription(action.attr.node, stanza.attr.from, stanza.attr.from);

				if ok then

					reply = st.reply(stanza)

						:tag("adminsub", { xmlns = xmlns_adminsub });

				else

					reply = st.error_reply(stanza, "cancel", ret);

				end

			elseif action.name == "unsubscribe" then

				local ok, ret = service[host_name]:remove_subscription(action.attr.node, stanza.attr.from, stanza.attr.from);

				if ok then

					reply = st.reply(stanza)

						:tag("adminsub", { xmlns = xmlns_adminsub });

				else

					reply = st.error_reply(stanza, "cancel", ret);

				end

			elseif action.name == "items" then

				local node = action.attr.node;

				local ok, ret = service[host_name]:get_items(node, stanza.attr.from);

				if not ok then

					return origin.send(st.error_reply(stanza, "cancel", ret));

				end

				local data = st.stanza("items", { node = node });

				for _, entry in pairs(ret) do

					data:add_child(entry);

				end

				if data then

					reply = st.reply(stanza)

						:tag("adminsub", { xmlns = xmlns_adminsub })

							:add_child(data);

				else

					reply = st.error_reply(stanza, "cancel", "item-not-found");

				end

			elseif action.name == "adminfor" then

				local data = st.stanza("adminfor");

				for host_name in pairs(hosts) do

					if is_admin(stanza.attr.from, host_name) then

						data:tag("item"):text(host_name):up();

					end

				end

				reply = st.reply(stanza)

					:tag("adminsub", { xmlns = xmlns_adminsub })

						:add_child(data);

			else

				reply = st.error_reply(stanza, "feature-not-implemented");

			end

			return origin.send(reply);

		end);

		host_table.events.add_handler("resource-bind", function(event)

			add_client(event.session, host_name);

		end);

		host_table.events.add_handler("resource-unbind", function(event)

			del_client(event.session, host_name);

			service[host_name]:remove_subscription(xmlns_c2s_session, host_name, event.session.full_jid);

			service[host_name]:remove_subscription(xmlns_s2s_session, host_name, event.session.full_jid);

		end);

		host_table.events.add_handler("s2sout-established", function(event)

			add_host(event.session, "out", host_name);

		end);

		host_table.events.add_handler("s2sin-established", function(event)

			add_host(event.session, "in", host_name);

		end);

		host_table.events.add_handler("s2sout-destroyed", function(event)

			del_host(event.session, "out", host_name);

		end);

		host_table.events.add_handler("s2sin-destroyed", function(event)

			del_host(event.session, "in", host_name);

		end);

	end

end);

function simple_broadcast(node, jids, item, host)

	item = st.clone(item);

	item.attr.xmlns = nil; -- Clear the pubsub namespace

	local message = st.message({ from = host, type = "headline" })

		:tag("event", { xmlns = xmlns_adminsub .. "#event" })

			:tag("items", { node = node })

				:add_child(item);

	for jid in pairs(jids) do

		module:log("debug", "Sending notification to %s", jid);

		message.attr.to = jid;

		core_post_stanza(hosts[host], message);

	end

end

function get_affiliation(jid, host)

	local bare_jid = jid_bare(jid);

	if is_admin(bare_jid, host) then

		return "member";

	else

		return "none";

	end

end