-- Copyright (C) 2009 Thilo Cestonaro

-- Copyright (C) 2009-2011 Florian Zeitz

--

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

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

--

local it = require "util.iterators";

local st = require "util.stanza";

local is_admin = require "core.usermanager".is_admin;

local jid_host = require "util.jid".host;

local adhoc_handle_cmd = module:require "adhoc".handle_cmd;

local xmlns_cmd = "http://jabber.org/protocol/commands";

local commands = {};

module:add_feature(xmlns_cmd);

module:hook("host-disco-info-node", function (event)

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

	if commands[node] then

		local from = stanza.attr.from;

		local privileged = is_admin(from, stanza.attr.to);

		local global_admin = is_admin(from);

		local hostname = jid_host(from);

		local command = commands[node];

		if (command.permission == "admin" and privileged)

		    or (command.permission == "global_admin" and global_admin)

		    or (command.permission == "local_user" and hostname == module.host)

		    or (command.permission == "any") then

			reply:tag("identity", { name = command.name,

			    category = "automation", type = "command-node" }):up();

			reply:tag("feature", { var = xmlns_cmd }):up();

			reply:tag("feature", { var = "jabber:x:data" }):up();

			event.exists = true;

		else

			origin.send(st.error_reply(stanza, "auth", "forbidden", "This item is not available to you"));

			return true;

		end

	elseif node == xmlns_cmd then

		reply:tag("identity", { name = "Ad-Hoc Commands",

		    category = "automation", type = "command-list" }):up();

		    event.exists = true;

	end

end);

module:hook("host-disco-items-node", function (event)

	local stanza, reply, disco_node = event.stanza, event.reply, event.node;

	if disco_node ~= xmlns_cmd then

		return;

	end

	local from = stanza.attr.from;

	local admin = is_admin(from, stanza.attr.to);

	local global_admin = is_admin(from);

	local hostname = jid_host(from);

	for node, command in it.sorted_pairs(commands) do

		if (command.permission == "admin" and admin)

		    or (command.permission == "global_admin" and global_admin)

		    or (command.permission == "local_user" and hostname == module.host)

		    or (command.permission == "any") then

			reply:tag("item", { name = command.name,

			    node = node, jid = module:get_host() });

			reply:up();

		end

	end

	event.exists = true;

end);

module:hook("iq-set/host/"..xmlns_cmd..":command", function (event)

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

	local node = stanza.tags[1].attr.node

	local command = commands[node];

	if command then

		local from = stanza.attr.from;

		local admin = is_admin(from, stanza.attr.to);

		local global_admin = is_admin(from);

		local hostname = jid_host(from);

		if (command.permission == "admin" and not admin)

		    or (command.permission == "global_admin" and not global_admin)

		    or (command.permission == "local_user" and hostname ~= module.host) then

			origin.send(st.error_reply(stanza, "auth", "forbidden", "You don't have permission to execute this command"):up()

			    :add_child(commands[node]:cmdtag("canceled")

				:tag("note", {type="error"}):text("You don't have permission to execute this command")));

			return true

		end

		-- User has permission now execute the command

		adhoc_handle_cmd(commands[node], origin, stanza);

		return true;

	end

end, 500);

local function adhoc_added(event)

	local item = event.item;

	module:log("debug", "Command added by mod_%s: %q, %q", item._provided_by or "<unknown module>", item.name, item.node);

	commands[item.node] = item;

end

local function adhoc_removed(event)

	commands[event.item.node] = nil;

end

module:handle_items("adhoc", adhoc_added, adhoc_removed); -- COMPAT pre module:provides() introduced in 0.9

module:handle_items("adhoc-provider", adhoc_added, adhoc_removed);