net/httpserver.lua

   1 -- Prosody IM
   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 local socket = require "socket"
  11 local server = require "net.server"
  12 local url_parse = require "socket.url".parse;
  13
  14 local connlisteners_start = require "net.connlisteners".start;
  15 local connlisteners_get = require "net.connlisteners".get;
  16 local listener;
  17
  18 local t_insert, t_concat = table.insert, table.concat;
  19 local s_match, s_gmatch = string.match, string.gmatch;
  20 local tonumber, tostring, pairs, ipairs, type = tonumber, tostring, pairs, ipairs, type;
  21
  22 local urlencode = function (s) return s and (s:gsub("%W", function (c) return string.format("%%%02x", c:byte()); end)); end
  23
  24 local log = require "util.logger".init("httpserver");
  25
  26 local http_servers = {};
  27
  28 module "httpserver"
  29
  30 local default_handler;
  31
  32 local function expectbody(reqt)
  33     return reqt.method == "POST";
  34 end
  35
  36 local function send_response(request, response)
  37         -- Write status line
  38         local resp;
  39         if response.body or response.headers then
  40                 local body = response.body and tostring(response.body);
  41                 log("debug", "Sending response to %s", request.id);
  42                 resp = { "HTTP/1.0 ", response.status or "200 OK", "\r\n"};
  43                 local h = response.headers;
  44                 if h then
  45                         for k, v in pairs(h) do
  46                                 t_insert(resp, k);
  47                                 t_insert(resp, ": ");
  48                                 t_insert(resp, v);
  49                                 t_insert(resp, "\r\n");
  50                         end
  51                 end
  52                 if body and not (h and h["Content-Length"]) then
  53                         t_insert(resp, "Content-Length: ");
  54                         t_insert(resp, #body);
  55                         t_insert(resp, "\r\n");
  56                 end
  57                 t_insert(resp, "\r\n");
  58
  59                 if body and request.method ~= "HEAD" then
  60                         t_insert(resp, body);
  61                 end
  62         else
  63                 -- Response we have is just a string (the body)
  64                 log("debug", "Sending 200 response to %s", request.id or "<none>");
  65
  66                 resp = { "HTTP/1.0 200 OK\r\n" };
  67                 t_insert(resp, "Connection: close\r\n");
  68                 t_insert(resp, "Content-Length: ");
  69                 t_insert(resp, #response);
  70                 t_insert(resp, "\r\n\r\n");
  71
  72                 t_insert(resp, response);
  73         end
  74         request.write(t_concat(resp));
  75         if not request.stayopen then
  76                 request:destroy();
  77         end
  78 end
  79
  80 local function call_callback(request, err)
  81         if request.handled then return; end
  82         request.handled = true;
  83         local callback = request.callback;
  84         if not callback and request.path then
  85                 local path = request.url.path;
  86                 local base = path:match("^/([^/?]+)");
  87                 if not base then
  88                         base = path:match("^http://[^/?]+/([^/?]+)");
  89                 end
  90
  91                 callback = (request.server and request.server.handlers[base]) or default_handler;
  92         end
  93         if callback then
  94                 if err then
  95                         log("debug", "Request error: "..err);
  96                         if not callback(nil, err, request) then
  97                                 destroy_request(request);
  98                         end
  99                         return;
 100                 end
 101
 102                 local response = callback(request.method, request.body and t_concat(request.body), request);
 103                 if response then
 104                         if response == true and not request.destroyed then
 105                                 -- Keep connection open, we will reply later
 106                                 log("debug", "Request %s left open, on_destroy is %s", request.id, tostring(request.on_destroy));
 107                         elseif response ~= true then
 108                                 -- Assume response
 109                                 send_response(request, response);
 110                                 destroy_request(request);
 111                         end
 112                 else
 113                         log("debug", "Request handler provided no response, destroying request...");
 114                         -- No response, close connection
 115                         destroy_request(request);
 116                 end
 117         end
 118 end
 119
 120 local function request_reader(request, data, startpos)
 121         if not data then
 122                 if request.body then
 123                         call_callback(request);
 124                 else
 125                         -- Error.. connection was closed prematurely
 126                         call_callback(request, "connection-closed");
 127                 end
 128                 -- Here we force a destroy... the connection is gone, so we can't reply later
 129                 destroy_request(request);
 130                 return;
 131         end
 132         if request.state == "body" then
 133                 log("debug", "Reading body...")
 134                 if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.headers["content-length"]); end
 135                 if startpos then
 136                         data = data:sub(startpos, -1)
 137                 end
 138                 t_insert(request.body, data);
 139                 if request.bodylength then
 140                         request.havebodylength = request.havebodylength + #data;
 141                         if request.havebodylength >= request.bodylength then
 142                                 -- We have the body
 143                                 call_callback(request);
 144                         end
 145                 end
 146         elseif request.state == "headers" then
 147                 log("debug", "Reading headers...")
 148                 local pos = startpos;
 149                 local headers = request.headers or {};
 150                 for line in data:gmatch("(.-)\r\n") do
 151                         startpos = (startpos or 1) + #line + 2;
 152                         local k, v = line:match("(%S+): (.+)");
 153                         if k and v then
 154                                 headers[k:lower()] = v;
 155 --                              log("debug", "Header: "..k:lower().." = "..v);
 156                         elseif #line == 0 then
 157                                 request.headers = headers;
 158                                 break;
 159                         else
 160                                 log("debug", "Unhandled header line: "..line);
 161                         end
 162                 end
 163
 164                 if not expectbody(request) then
 165                         call_callback(request);
 166                         return;
 167                 end
 168
 169                 -- Reached the end of the headers
 170                 request.state = "body";
 171                 if #data > startpos then
 172                         return request_reader(request, data:sub(startpos, -1));
 173                 end
 174         elseif request.state == "request" then
 175                 log("debug", "Reading request line...")
 176                 local method, path, http, linelen = data:match("^(%S+) (%S+) HTTP/(%S+)\r\n()", startpos);
 177                 if not method then
 178                         log("warn", "Invalid HTTP status line, telling callback then closing");
 179                         local ret = call_callback(request, "invalid-status-line");
 180                         request:destroy();
 181                         return ret;
 182                 end
 183
 184                 request.method, request.path, request.httpversion = method, path, http;
 185
 186                 request.url = url_parse(request.path);
 187
 188                 log("debug", method.." request for "..tostring(request.path) .. " on port "..request.handler.serverport());
 189
 190                 if request.onlystatus then
 191                         if not call_callback(request) then
 192                                 return;
 193                         end
 194                 end
 195
 196                 request.state = "headers";
 197
 198                 if #data > linelen then
 199                         return request_reader(request, data:sub(linelen, -1));
 200                 end
 201         end
 202 end
 203
 204 -- The default handler for requests
 205 default_handler = function (method, body, request)
 206         log("debug", method.." request for "..tostring(request.path) .. " on port "..request.handler.serverport());
 207         return { status = "404 Not Found",
 208                         headers = { ["Content-Type"] = "text/html" },
 209                         body = "<html><head><title>Page Not Found</title></head><body>Not here :(</body></html>" };
 210 end
 211
 212
 213 function new_request(handler)
 214         return { handler = handler, conn = handler.socket,
 215                         write = handler.write, state = "request",
 216                         server = http_servers[handler.serverport()],
 217                         send = send_response,
 218                         destroy = destroy_request,
 219                         id = tostring{}:match("%x+$")
 220                          };
 221 end
 222
 223 function destroy_request(request)
 224         log("debug", "Destroying request %s", request.id);
 225         listener = listener or connlisteners_get("httpserver");
 226         if not request.destroyed then
 227                 request.destroyed = true;
 228                 if request.on_destroy then
 229                         log("debug", "Request has destroy callback");
 230                         request.on_destroy(request);
 231                 else
 232                         log("debug", "Request has no destroy callback");
 233                 end
 234                 request.handler.close()
 235                 if request.conn then
 236                         listener.disconnect(request.handler, "closed");
 237                 end
 238         end
 239 end
 240
 241 function new(params)
 242         local http_server = http_servers[params.port];
 243         if not http_server then
 244                 http_server = { handlers = {} };
 245                 http_servers[params.port] = http_server;
 246                 -- We weren't already listening on this port, so start now
 247                 connlisteners_start("httpserver", params);
 248         end
 249         if params.base then
 250                 http_server.handlers[params.base] = params.handler;
 251         end
 252 end
 253
 254 function set_default_handler(handler)
 255         default_handler = handler;
 256 end
 257
 258 function new_from_config(ports, handle_request, default_options)
 259         if type(handle_request) == "string" then -- COMPAT with old plugins
 260                 log("warn", "Old syntax of httpserver.new_from_config being used to register %s", handle_request);
 261                 handle_request, default_options = default_options, { base = handle_request };
 262         end
 263         for _, options in ipairs(ports) do
 264                 local port = default_options.port or 5280;
 265                 local base = default_options.base;
 266                 local ssl = default_options.ssl or false;
 267                 local interface = default_options.interface;
 268                 if type(options) == "number" then
 269                         port = options;
 270                 elseif type(options) == "table" then
 271                         port = options.port or port;
 272                         base = options.path or base;
 273                         ssl = options.ssl or ssl;
 274                         interface = options.interface or interface;
 275                 elseif type(options) == "string" then
 276                         base = options;
 277                 end
 278
 279                 if ssl then
 280                         ssl.mode = "server";
 281                         ssl.protocol = "sslv23";
 282                 end
 283
 284                 new{ port = port, interface = interface,
 285                         base = base, handler = handle_request,
 286                         ssl = ssl, type = (ssl and "ssl") or "tcp" };
 287         end
 288 end
 289
 290 _M.request_reader = request_reader;
 291 _M.send_response = send_response;
 292 _M.urlencode = urlencode;
 293
 294 return _M;