plugins/mod_xmlrpc.lua
author Waqas Hussain <waqas20@gmail.com>
Wed, 04 Mar 2009 22:59:58 +0500
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child 889 bb959588bbc4
permissions -rw-r--r--
XML-RPC: Set appropriate Content-Type header in HTTP response
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-- Prosody IM v0.3
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-- Copyright (C) 2008-2009 Matthew Wild
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-- Copyright (C) 2008-2009 Waqas Hussain
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-- 
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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module.host = "*" -- Global module
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local httpserver = require "net.httpserver";
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local st = require "util.stanza";
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local pcall = pcall;
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local unpack = unpack;
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local tostring = tostring;
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local translate_request = require "util.xmlrpc".translate_request;
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local create_response = require "util.xmlrpc".create_response;
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local create_error_response = require "util.xmlrpc".create_error_response;
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local entity_map = setmetatable({
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	["amp"] = "&";
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	["gt"] = ">";
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	["lt"] = "<";
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	["apos"] = "'";
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	["quot"] = "\"";
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}, {__index = function(_, s)
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		if s:sub(1,1) == "#" then
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			if s:sub(2,2) == "x" then
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				return string.char(tonumber(s:sub(3), 16));
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			else
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				return string.char(tonumber(s:sub(2)));
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			end
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		end
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	end
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});
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local function xml_unescape(str)
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	return (str:gsub("&(.-);", entity_map));
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end
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local function parse_xml(xml)
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	local stanza = st.stanza("root");
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	local regexp = "<([^>]*)>([^<]*)";
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	for elem, text in xml:gmatch(regexp) do
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		--print("[<"..elem..">|"..text.."]");
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		if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions
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		elseif elem:sub(1,1) == "/" then -- end tag
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			elem = elem:sub(2);
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			stanza:up(); -- TODO check for start-end tag name match
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		elseif elem:sub(-1,-1) == "/" then -- empty tag
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			elem = elem:sub(1,-2);
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			stanza:tag(elem):up();
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		else -- start tag
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			stanza:tag(elem);
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		end
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		if #text ~= 0 then -- text
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			stanza:text(xml_unescape(text));
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		end
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	end
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	return stanza.tags[1];
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end
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local function get_method(method)
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	return function(...)
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		return {method = method; args = {...}};
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	end
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end
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local function handle_xmlrpc_request(method, args)
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	method = get_method(method);
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	if not method then return create_error_response(404, "method not found"); end
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	args = args or {};
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	local success, result = pcall(method, unpack(args));
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	if success then
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		success, result = pcall(create_response, result or "nil");
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		if success then
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			return result;
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		end
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		return create_error_response(500, "Error in creating response: "..result);
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	end
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	return create_error_response(0, result or "nil");
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end
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local function handle_xmpp_request(origin, stanza)
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	local query = stanza.tags[1];
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	if query.name == "query" then
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		if #query.tags == 1 then
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			local success, method, args = pcall(translate_request, query.tags[1]);
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			if success then
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				local result = handle_xmlrpc_request(method, args);
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				origin.send(st.reply(stanza):tag('query', {xmlns='jabber:iq:rpc'}):add_child(result));
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			else
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				origin.send(st.error_reply(stanza, "modify", "bad-request", method));
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			end
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		else
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			origin.send(st.error_reply(stanza, "modify", "bad-request", "No content in XML-RPC request"));
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		end
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	else
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		origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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	end
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end
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module:add_iq_handler({"c2s", "s2sin"}, "jabber:iq:rpc", handle_xmpp_request);
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module:add_feature("jabber:iq:rpc");
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local default_headers = { ["Content-Type"] = "text/xml" };
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local function handle_http_request(method, body, request)
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	local stanza = body and parse_xml(body);
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	if (not stanza) or request.method ~= "POST" then
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		return "<html><body>You really don't look like an XML-RPC client to me... what do you want?</body></html>";
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	end
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	local success, method, args = pcall(translate_request, stanza);
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	if success then
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		return { headers = default_headers; body = tostring(handle_xmlrpc_request(method, args)) };
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	end
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	return "<html><body>Error parsing XML-RPC request: "..tostring(method).."</body></html>";
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end
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httpserver.new{ port = 9000, base = "xmlrpc", handler = handle_http_request }