plugins/mod_xmlrpc.lua

   1 -- Prosody IM v0.4
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 module.host = "*" -- Global module
  11
  12 local httpserver = require "net.httpserver";
  13 local st = require "util.stanza";
  14 local pcall = pcall;
  15 local unpack = unpack;
  16 local tostring = tostring;
  17 local is_admin = require "core.usermanager".is_admin;
  18 local jid_split = require "util.jid".split;
  19 local b64_decode = require "util.encodings".base64.decode;
  20 local get_method = require "core.objectmanager".get_object;
  21 local validate_credentials = require "core.usermanager".validate_credentials;
  22
  23 local translate_request = require "util.xmlrpc".translate_request;
  24 local create_response = require "util.xmlrpc".create_response;
  25 local create_error_response = require "util.xmlrpc".create_error_response;
  26
  27 local entity_map = setmetatable({
  28         ["amp"] = "&";
  29         ["gt"] = ">";
  30         ["lt"] = "<";
  31         ["apos"] = "'";
  32         ["quot"] = "\"";
  33 }, {__index = function(_, s)
  34                 if s:sub(1,1) == "#" then
  35                         if s:sub(2,2) == "x" then
  36                                 return string.char(tonumber(s:sub(3), 16));
  37                         else
  38                                 return string.char(tonumber(s:sub(2)));
  39                         end
  40                 end
  41         end
  42 });
  43 local function xml_unescape(str)
  44         return (str:gsub("&(.-);", entity_map));
  45 end
  46 local function parse_xml(xml)
  47         local stanza = st.stanza("root");
  48         local regexp = "<([^>]*)>([^<]*)";
  49         for elem, text in xml:gmatch(regexp) do
  50                 --print("[<"..elem..">|"..text.."]");
  51                 if elem:sub(1,1) == "!" or elem:sub(1,1) == "?" then -- neglect comments and processing-instructions
  52                 elseif elem:sub(1,1) == "/" then -- end tag
  53                         elem = elem:sub(2);
  54                         stanza:up(); -- TODO check for start-end tag name match
  55                 elseif elem:sub(-1,-1) == "/" then -- empty tag
  56                         elem = elem:sub(1,-2);
  57                         stanza:tag(elem):up();
  58                 else -- start tag
  59                         stanza:tag(elem);
  60                 end
  61                 if #text ~= 0 then -- text
  62                         stanza:text(xml_unescape(text));
  63                 end
  64         end
  65         return stanza.tags[1];
  66 end
  67
  68 local function handle_xmlrpc_request(method, args)
  69         method = get_method(method);
  70         if not method then return create_error_response(404, "method not found"); end
  71         args = args or {};
  72         local success, result = pcall(method, unpack(args));
  73         if success then
  74                 success, result = pcall(create_response, result or "nil");
  75                 if success then
  76                         return result;
  77                 end
  78                 return create_error_response(500, "Error in creating response: "..result);
  79         end
  80         return create_error_response(0, result or "nil");
  81 end
  82
  83 local function handle_xmpp_request(origin, stanza)
  84         local query = stanza.tags[1];
  85         if query.name == "query" then
  86                 if #query.tags == 1 then
  87                         if is_admin(stanza.attr.from) then
  88                                 local success, method, args = pcall(translate_request, query.tags[1]);
  89                                 if success then
  90                                         local result = handle_xmlrpc_request(method, args);
  91                                         origin.send(st.reply(stanza):tag('query', {xmlns='jabber:iq:rpc'}):add_child(result));
  92                                 else
  93                                         origin.send(st.error_reply(stanza, "modify", "bad-request", method));
  94                                 end
  95                         else origin.send(st.error_reply(stanza, "auth", "forbidden", "No content in XML-RPC request")); end
  96                 else origin.send(st.error_reply(stanza, "modify", "bad-request", "No content in XML-RPC request")); end
  97         else origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); end
  98 end
  99 module:add_iq_handler({"c2s", "s2sin"}, "jabber:iq:rpc", handle_xmpp_request);
 100 module:add_feature("jabber:iq:rpc");
 101 -- TODO add <identity category='automation' type='rpc'/> to disco replies
 102
 103 local default_headers = { ['Content-Type'] = 'text/xml' };
 104 local unauthorized_response = { status = '401 UNAUTHORIZED', headers = {['Content-Type']='text/html', ['WWW-Authenticate']='Basic realm="WallyWorld"'}; body = "<html><body>Authentication required</body></html>"; };
 105 local function handle_http_request(method, body, request)
 106         -- authenticate user
 107         local username, password = b64_decode(request['authorization'] or ''):gmatch('([^:]*):(.*)')(); -- TODO digest auth
 108         local node, host = jid_split(username);
 109         if not validate_credentials(host, node, password) and is_admin(username) then
 110                 return unauthorized_response;
 111         end
 112         -- parse request
 113         local stanza = body and parse_xml(body);
 114         if (not stanza) or request.method ~= "POST" then
 115                 return "<html><body>You really don't look like an XML-RPC client to me... what do you want?</body></html>";
 116         end
 117         -- execute request
 118         local success, method, args = pcall(translate_request, stanza);
 119         if success then
 120                 return { headers = default_headers; body = tostring(handle_xmlrpc_request(method, args)) };
 121         end
 122         return "<html><body>Error parsing XML-RPC request: "..tostring(method).."</body></html>";
 123 end
 124 httpserver.new{ port = 9000, base = "xmlrpc", handler = handle_http_request }