net/http.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 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 local socket = require "socket"
  11 local mime = require "mime"
  12 local url = require "socket.url"
  13 local httpstream_new = require "util.httpstream".new;
  14
  15 local server = require "net.server"
  16
  17 local connlisteners_get = require "net.connlisteners".get;
  18 local listener = connlisteners_get("httpclient") or error("No httpclient listener!");
  19
  20 local t_insert, t_concat = table.insert, table.concat;
  21 local pairs, ipairs = pairs, ipairs;
  22 local tonumber, tostring, xpcall, select, debug_traceback, char, format =
  23       tonumber, tostring, xpcall, select, debug.traceback, string.char, string.format;
  24
  25 local log = require "util.logger".init("http");
  26
  27 module "http"
  28
  29 function urlencode(s) return s and (s:gsub("%W", function (c) return format("%%%02x", c:byte()); end)); end
  30 function urldecode(s) return s and (s:gsub("%%(%x%x)", function (c) return char(tonumber(c,16)); end)); end
  31
  32 local function _formencodepart(s)
  33         return s and (s:gsub("%W", function (c)
  34                 if c ~= " " then
  35                         return format("%%%02x", c:byte());
  36                 else
  37                         return "+";
  38                 end
  39         end));
  40 end
  41 function formencode(form)
  42         local result = {};
  43         for _, field in ipairs(form) do
  44                 t_insert(result, _formencodepart(field.name).."=".._formencodepart(field.value));
  45         end
  46         return t_concat(result, "&");
  47 end
  48
  49 local function request_reader(request, data, startpos)
  50         if not request.parser then
  51                 local function success_cb(r)
  52                         if request.callback then
  53                                 for k,v in pairs(r) do request[k] = v; end
  54                                 request.callback(r.body, r.code, request);
  55                                 request.callback = nil;
  56                         end
  57                         destroy_request(request);
  58                 end
  59                 local function error_cb(r)
  60                         if request.callback then
  61                                 request.callback(r or "connection-closed", 0, request);
  62                                 request.callback = nil;
  63                         end
  64                         destroy_request(request);
  65                 end
  66                 local function options_cb()
  67                         return request;
  68                 end
  69                 request.parser = httpstream_new(success_cb, error_cb, "client", options_cb);
  70         end
  71         request.parser:feed(data);
  72 end
  73
  74 local function handleerr(err) log("error", "Traceback[http]: %s: %s", tostring(err), debug_traceback()); end
  75 function request(u, ex, callback)
  76         local req = url.parse(u);
  77
  78         if not (req and req.host) then
  79                 callback(nil, 0, req);
  80                 return nil, "invalid-url";
  81         end
  82
  83         if not req.path then
  84                 req.path = "/";
  85         end
  86
  87         local custom_headers, body;
  88         local default_headers = { ["Host"] = req.host, ["User-Agent"] = "Prosody XMPP Server" }
  89
  90
  91         if req.userinfo then
  92                 default_headers["Authorization"] = "Basic "..mime.b64(req.userinfo);
  93         end
  94
  95         if ex then
  96                 custom_headers = ex.headers;
  97                 req.onlystatus = ex.onlystatus;
  98                 body = ex.body;
  99                 if body then
 100                         req.method = "POST ";
 101                         default_headers["Content-Length"] = tostring(#body);
 102                         default_headers["Content-Type"] = "application/x-www-form-urlencoded";
 103                 end
 104                 if ex.method then req.method = ex.method; end
 105         end
 106
 107         req.handler, req.conn = server.wrapclient(socket.tcp(), req.host, req.port or 80, listener, "*a");
 108         req.write = function (...) return req.handler:write(...); end
 109         req.conn:settimeout(0);
 110         local ok, err = req.conn:connect(req.host, req.port or 80);
 111         if not ok and err ~= "timeout" then
 112                 callback(nil, 0, req);
 113                 return nil, err;
 114         end
 115
 116         local request_line = { req.method or "GET", " ", req.path, " HTTP/1.1\r\n" };
 117
 118         if req.query then
 119                 t_insert(request_line, 4, "?");
 120                 t_insert(request_line, 5, req.query);
 121         end
 122
 123         req.write(t_concat(request_line));
 124         local t = { [2] = ": ", [4] = "\r\n" };
 125         if custom_headers then
 126                 for k, v in pairs(custom_headers) do
 127                         t[1], t[3] = k, v;
 128                         req.write(t_concat(t));
 129                         default_headers[k] = nil;
 130                 end
 131         end
 132
 133         for k, v in pairs(default_headers) do
 134                 t[1], t[3] = k, v;
 135                 req.write(t_concat(t));
 136                 default_headers[k] = nil;
 137         end
 138         req.write("\r\n");
 139
 140         if body then
 141                 req.write(body);
 142         end
 143
 144         req.callback = function (content, code, request) log("debug", "Calling callback, status %s", code or "---"); return select(2, xpcall(function () return callback(content, code, request) end, handleerr)); end
 145         req.reader = request_reader;
 146         req.state = "status";
 147
 148         listener.register_request(req.handler, req);
 149
 150         return req;
 151 end
 152
 153 function destroy_request(request)
 154         if request.conn then
 155                 request.conn = nil;
 156                 request.handler:close()
 157                 listener.ondisconnect(request.handler, "closed");
 158         end
 159 end
 160
 161 _M.urlencode = urlencode;
 162
 163 return _M;