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 local b64 = require "util.encodings".base64.encode;
  10 local url = require "socket.url"
  11 local httpstream_new = require "net.http.parser".new;
  12 local util_http = require "util.http";
  13
  14 local ssl_available = pcall(require, "ssl");
  15
  16 local server = require "net.server"
  17
  18 local t_insert, t_concat = table.insert, table.concat;
  19 local pairs = pairs;
  20 local tonumber, tostring, xpcall, select, traceback =
  21       tonumber, tostring, xpcall, select, debug.traceback;
  22 local assert, error = assert, error
  23
  24 local log = require "util.logger".init("http");
  25
  26 local _ENV = nil;
  27
  28 local requests = {}; -- Open requests
  29
  30 local listener = { default_port = 80, default_mode = "*a" };
  31
  32 function listener.onconnect(conn)
  33         local req = requests[conn];
  34         -- Send the request
  35         local request_line = { req.method or "GET", " ", req.path, " HTTP/1.1\r\n" };
  36         if req.query then
  37                 t_insert(request_line, 4, "?"..req.query);
  38         end
  39
  40         conn:write(t_concat(request_line));
  41         local t = { [2] = ": ", [4] = "\r\n" };
  42         for k, v in pairs(req.headers) do
  43                 t[1], t[3] = k, v;
  44                 conn:write(t_concat(t));
  45         end
  46         conn:write("\r\n");
  47
  48         if req.body then
  49                 conn:write(req.body);
  50         end
  51 end
  52
  53 function listener.onincoming(conn, data)
  54         local request = requests[conn];
  55
  56         if not request then
  57                 log("warn", "Received response from connection %s with no request attached!", tostring(conn));
  58                 return;
  59         end
  60
  61         if data and request.reader then
  62                 request:reader(data);
  63         end
  64 end
  65
  66 function listener.ondisconnect(conn, err)
  67         local request = requests[conn];
  68         if request and request.conn then
  69                 request:reader(nil, err);
  70         end
  71         requests[conn] = nil;
  72 end
  73
  74 function listener.ondetach(conn)
  75         requests[conn] = nil;
  76 end
  77
  78 local function destroy_request(request)
  79         if request.conn then
  80                 request.conn = nil;
  81                 request.handler:close()
  82         end
  83 end
  84
  85 local function request_reader(request, data, err)
  86         if not request.parser then
  87                 local function error_cb(reason)
  88                         if request.callback then
  89                                 request.callback(reason or "connection-closed", 0, request);
  90                                 request.callback = nil;
  91                         end
  92                         destroy_request(request);
  93                 end
  94
  95                 if not data then
  96                         error_cb(err);
  97                         return;
  98                 end
  99
 100                 local function success_cb(r)
 101                         if request.callback then
 102                                 request.callback(r.body, r.code, r, request);
 103                                 request.callback = nil;
 104                         end
 105                         destroy_request(request);
 106                 end
 107                 local function options_cb()
 108                         return request;
 109                 end
 110                 request.parser = httpstream_new(success_cb, error_cb, "client", options_cb);
 111         end
 112         request.parser:feed(data);
 113 end
 114
 115 local function handleerr(err) log("error", "Traceback[http]: %s", traceback(tostring(err), 2)); end
 116 local function request(u, ex, callback)
 117         local req = url.parse(u);
 118
 119         if not (req and req.host) then
 120                 callback(nil, 0, req);
 121                 return nil, "invalid-url";
 122         end
 123
 124         if not req.path then
 125                 req.path = "/";
 126         end
 127
 128         local method, headers, body;
 129
 130         local host, port = req.host, req.port;
 131         local host_header = host;
 132         if (port == "80" and req.scheme == "http")
 133         or (port == "443" and req.scheme == "https") then
 134                 port = nil;
 135         elseif port then
 136                 host_header = host_header..":"..port;
 137         end
 138
 139         headers = {
 140                 ["Host"] = host_header;
 141                 ["User-Agent"] = "Prosody XMPP Server";
 142         };
 143
 144         if req.userinfo then
 145                 headers["Authorization"] = "Basic "..b64(req.userinfo);
 146         end
 147
 148         if ex then
 149                 req.onlystatus = ex.onlystatus;
 150                 body = ex.body;
 151                 if body then
 152                         method = "POST";
 153                         headers["Content-Length"] = tostring(#body);
 154                         headers["Content-Type"] = "application/x-www-form-urlencoded";
 155                 end
 156                 if ex.method then method = ex.method; end
 157                 if ex.headers then
 158                         for k, v in pairs(ex.headers) do
 159                                 headers[k] = v;
 160                         end
 161                 end
 162         end
 163
 164         -- Attach to request object
 165         req.method, req.headers, req.body = method, headers, body;
 166
 167         local using_https = req.scheme == "https";
 168         if using_https and not ssl_available then
 169                 error("SSL not available, unable to contact https URL");
 170         end
 171         local port_number = port and tonumber(port) or (using_https and 443 or 80);
 172
 173         local sslctx = false;
 174         if using_https then
 175                 sslctx = ex and ex.sslctx or { mode = "client", protocol = "sslv23", options = { "no_sslv2", "no_sslv3" } };
 176         end
 177
 178         local handler, conn = server.addclient(host, port_number, listener, "*a", sslctx)
 179         if not handler then
 180                 callback(nil, 0, req);
 181                 return nil, conn;
 182         end
 183         req.handler, req.conn = handler, conn
 184         req.write = function (...) return req.handler:write(...); end
 185
 186         req.callback = function (content, code, request, response) log("debug", "Calling callback, status %s", code or "---"); return select(2, xpcall(function () return callback(content, code, request, response) end, handleerr)); end
 187         req.reader = request_reader;
 188         req.state = "status";
 189
 190         requests[req.handler] = req;
 191         return req;
 192 end
 193
 194 return {
 195         request = request;
 196
 197         -- COMPAT
 198         urlencode = util_http.urlencode;
 199         urldecode = util_http.urldecode;
 200         formencode = util_http.formencode;
 201         formdecode = util_http.formdecode;
 202 };