-- Prosody IM

-- Copyright (C) 2008-2009 Matthew Wild

-- Copyright (C) 2008-2009 Waqas Hussain

-- Copyright (C) 2009 Thilo Cestonaro

-- 

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

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

--

local prosody = prosody;

local helpers = require "util/helpers";

local st = require "util.stanza";

local datamanager = require "util.datamanager";

local bare_sessions = bare_sessions;

local util_Jid = require "util.jid";

local jid_bare = util_Jid.bare;

local jid_split = util_Jid.split;

function findNamedList (privacy_lists, name)

	local ret = nil

	if privacy_lists.lists == nil then

		module:log("debug", "no lists loaded.")

		return nil;

	end

	module:log("debug", "searching for list: %s", name);

	for i=1, #privacy_lists.lists do

		if privacy_lists.lists[i].name == name then

			ret = i;

			break;

		end

	end

	return ret;

end

function declineList (privacy_lists, origin, stanza, which)

	module:log("info", "User requests to decline the use of privacy list: %s", which);

	privacy_lists[which] = nil;

	origin.send(st.reply(stanza));

	return true;

end

function activateList (privacy_lists, origin, stanza, which, name)

	module:log("info", "User requests to change the privacy list: %s, to be list named %s", which, name);

	local ret = false;

	local idx = findNamedList(privacy_lists, name);

	if privacy_lists[which] == nil then

		privacy_lists[which] = "";

	end

	if privacy_lists[which] ~= name and idx ~= nil then

		privacy_lists[which] = name;

		origin.send(st.reply(stanza));

		ret = true;

	end

	return ret;

end

function deleteList (privacy_lists, origin, stanza, name)

	module:log("info", "User requests to delete privacy list: %s", name);

	local ret = false;

	local idx = findNamedList(privacy_lists, name);

	if idx ~= nil then

		table.remove(privacy_lists.lists, idx);

		origin.send(st.reply(stanza));

		ret = true;

	end

	return ret;

end

local function sortByOrder(a, b)

	if a.order < b.order then

		return true;

	end

	return false;

end

function createOrReplaceList (privacy_lists, origin, stanza, name, entries)

	module:log("info", "User requests to create / replace list named %s, item count: %d", name, #entries);

	local ret = true;

	local idx = findNamedList(privacy_lists, name);

	local bare_jid = origin.username.."@"..origin.host;

	if privacy_lists.lists == nil then

		privacy_lists.lists = {};

	end

	if idx == nil then

		idx = #privacy_lists.lists + 1;

	end

	local list = {};

	list.name = name;

	list.items = {};

	for _,item in ipairs(entries) do

		local tmp = {};

		tmp["type"] = item.attr.type;

		tmp["value"] = item.attr.value;

		tmp["action"] = item.attr.action;

		tmp["order"] = item.attr.order;

		tmp["presence-in"] = false;

		tmp["presence-out"] = false;

		tmp["message"] = false;

		tmp["iq"] = false;

		if #item.tags > 0 then

			for _,tag in ipairs(item.tags) do

				tmp[tag.name] = true;

			end

		end

		list.items[#list.items + 1] = tmp;

	end

	table.sort(list, sortByOrder);

	privacy_lists.lists[idx] = list;

	origin.send(st.reply(stanza));

	if bare_sessions[bare_jid] ~= nil then

		iq = st.iq ( { type = "set", id="push1" } );

		iq:tag ("query", { xmlns = "jabber:iq:privacy" } );

		iq:tag ("list", { name = list.name } ):up();

		iq:up();

		for resource, session in pairs(bare_sessions[bare_jid].sessions) do

			iq.attr.to = bare_jid.."/"..resource

			session.send(iq);

		end

	end

	return true;

end

function getList(privacy_lists, origin, stanza, name)

	module:log("info", "User requests list named: %s", name or "nil");

	local ret = false;

	local reply = st.reply(stanza);

	reply:tag("query", {xmlns="jabber:iq:privacy"});

	if name == nil then

		reply:tag("active", {name=privacy_lists.active or ""}):up();

		reply:tag("default", {name=privacy_lists.default or ""}):up();

		if privacy_lists.lists then

			for _,list in ipairs(privacy_lists.lists) do

				reply:tag("list", {name=list.name}):up();

			end

			ret = true;	

		end

	else

		local idx = findNamedList(privacy_lists, name);

		module:log("debug", "list idx: %d", idx or -1);

		if idx ~= nil then

			list = privacy_lists.lists[idx];

			reply = reply:tag("list", {name=list.name});

			for _,item in ipairs(list.items) do

				reply:tag("item", {type=item.type, value=item.value, action=item.action, order=item.order});

				if item["message"] then reply:tag("message"):up(); end

				if item["iq"] then reply:tag("iq"):up(); end

				if item["presence-in"] then reply:tag("presence-in"):up(); end

				if item["presence-out"] then reply:tag("presence-out"):up(); end

				reply:up();

			end

			ret = true;

		end

	end

	if ret then

		origin.send(reply);

	end

	return ret;

end

--          "[tagname]/[target-type]/[payload-namespace]:[payload-tagname]"

module:hook("iq/bare/jabber:iq:privacy:query", function(data)

	local origin, stanza = data.origin, data.stanza;

	if stanza.attr.to == nil then -- only service requests to own bare JID

		local err_reply = nil;

		local query = stanza.tags[1]; -- the query element

		local valid = false;

		local privacy_lists = datamanager.load(origin.username, origin.host, "privacy") or {};

		if stanza.attr.type == "set" then

			if #query.tags >= 1 then

				for _,tag in ipairs(query.tags) do

					if tag.name == "active" or tag.name == "default" then

						if tag.attr.name == nil then -- Client declines the use of active / default list

							valid = declineList(privacy_lists, origin, stanza, tag.name);

						else -- Client requests change of active / default list

							valid = activateList(privacy_lists, origin, stanza, tag.name, tag.attr.name);

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

						end

					elseif tag.name == "list" and tag.attr.name then -- Client adds / edits a privacy list

						if #tag.tags == 0 then -- Client removes a privacy list

							valid = deleteList(privacy_lists, origin, stanza, tag.attr.name);

						else -- Client edits a privacy list

							valid = createOrReplaceList(privacy_lists, origin, stanza, tag.attr.name, tag.tags)

						end

					end

				end

			end

		elseif stanza.attr.type == "get" then

			local name = nil;

			local listsToRetrieve = 0;

			if #query.tags >= 1 then

				for _,tag in ipairs(query.tags) do

					if tag.name == "list" then -- Client requests a privacy list from server

						name = tag.attr.name;

						listsToRetrieve = listsToRetrieve + 1;

					end

				end

			end

			if listsToRetrieve == 0 or listsToRetrieve == 1 then

				valid = getList(privacy_lists, origin, stanza, name);

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

			end

		end

		if valid == false then

			if err_reply == nil then

				err_reply = st.error_reply(stanza, "modify", "bad-request");

			end

			origin.send(err_reply);

		else

			datamanager.store(origin.username, origin.host, "privacy", privacy_lists);

		end

		return true;

	end

	return false;

end, 500);

function checkIfNeedToBeBlocked(e, node_, host_)

	local origin, stanza = e.origin, e.stanza;

	local privacy_lists = datamanager.load(node_, host_, "privacy") or {};

	local bare_jid = node_.."@"..host_;

	module:log("debug", "checkIfNeedToBeBlocked: username: %s, host: %s", node_, host_);

	module:log("debug", "stanza: %s, to: %s, form: %s", stanza.name, stanza.attr.to or "nil", stanza.attr.from or "nil");

	if privacy_lists.lists ~= nil and stanza.attr.to ~= nil and stanza.attr.from ~= nil then

		if privacy_lists.active == nil and privacy_lists.default == nil then 

			return; -- Nothing to block, default is Allow all

		end

		local idx;

		local list;

		local item;

		local block = false;

		local apply = false;

		local listname = privacy_lists.active;

		if listname == nil then

			listname = privacy_lists.default; -- no active list selected, use default list

		end

		idx = findNamedList(privacy_lists, listname);

		if idx == nil then

			module:log("info", "given privacy listname not found.");

			return;

		end

		list = privacy_lists.lists[idx];

		if list == nil then

			module:log("info", "privacy list index wrong.");

			return;

		end

		for _,item in ipairs(list.items) do

			local apply = false;

			block = false;

			if	(stanza.name == "message" and item.message) or

				(stanza.name == "iq" and item.iq) or

				(stanza.name == "presence" and jid_bare(stanza.attr.to) == bare_jid and item["presence-in"]) or

				(stanza.name == "presence" and jid_bare(stanza.attr.from) == bare_jid and item["presence-out"]) or

				(item.message == false and item.iq == false and item["presence-in"] == false and item["presence-in"] == false) then

				module:log("debug", "stanza type matched.");

					apply = true;

			end

			if apply then

				local evilJid = {};

				apply = false;

				if jid_bare(stanza.attr.to) == bare_jid then

					evilJid.node, evilJid.host, evilJid.resource = jid_split(stanza.attr.from);

				else

					evilJid.node, evilJid.host, evilJid.resource = jid_split(stanza.attr.to);

				end

				if	item.type == "jid" and 

					(evilJid.node and evilJid.host and evilJid.resource and item.value == evilJid.node.."@"..evilJid.host.."/"..evilJid.resource) or

					(evilJid.node and evilJid.host and item.value == evilJid.node.."@"..evilJid.host) or

					(evilJid.host and evilJid.resource and item.value == evilJid.host.."/"..evilJid.resource) or

					(evilJid.host and item.value == evilJid.host) then

					module:log("debug", "jid matched.");

					apply = true;

					block = (item.action == "deny");

				elseif item.type == "group" then

					local groups = origin.roster[jid_bare(stanza.from)].groups;

					for _,group in ipairs(groups) do

						if group == item.value then

							module:log("debug", "group matched.");

							apply = true;

							block = (item.action == "deny");

							break;

						end

					end

				elseif item.type == "subscription" then

					if origin.roster[jid_bare(stanza.from)].subscription == item.value then

						module:log("debug", "subscription matched.");

						apply = true;

						block = (item.action == "deny");

					end

				elseif item.type == nil then

					module:log("debug", "no item.type, so matched.");

					apply = true;

					block = (item.action == "deny");

				end

			end

			if apply then

				if block then

					module:log("info", "stanza blocked: %s, to: %s, from: %s", stanza.name, stanza.attr.to or "nil", stanza.attr.from or "nil");

					if stanza.name == "message" then

						origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));

					elseif stanza.name == "iq" and (stanza.attr.type == "get" or stanza.attr.type == "set") then

						origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));

					end

					return true; -- stanza blocked !

				else

					module:log("info", "stanza explicit allowed!")

				end

			end

		end

	end

	return;

end

function preCheckIncoming(e)

	if e.stanza.attr.to ~= nil then

		local node, host, resource = jid_split(e.stanza.attr.to);

		if node == nil or host == nil then

			return;

		end

		return checkIfNeedToBeBlocked(e, node, host);

	end

	return;

end

function preCheckOutgoing(e)

	if e.stanza.attr.from ~= nil then

		local node, host, resource = jid_split(e.stanza.attr.from);

		if node == nil or host == nil then

			return;

		end

		return checkIfNeedToBeBlocked(e, node, host);

	end

	return;

end

module:hook("pre-message/full", preCheckOutgoing, 500);

module:hook("pre-message/bare", preCheckOutgoing, 500);

module:hook("pre-message/host", preCheckOutgoing, 500);