net/http.lua

   1
   2 local socket = require "socket"
   3 local mime = require "mime"
   4 local url = require "socket.url"
   5
   6 local server = require "net.server"
   7
   8 local connlisteners_get = require "net.connlisteners".get;
   9 local listener = connlisteners_get("httpclient") or error("No httpclient listener!");
  10
  11 local t_insert, t_concat = table.insert, table.concat;
  12 local tonumber, tostring, pairs = tonumber, tostring, pairs;
  13 local print = function () end
  14
  15 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
  16 local urlencode = function (s) return s and (s:gsub("%W", function (c) return string.format("%%%x", c:byte()); end)); end
  17
  18 module "http"
  19
  20 local function expectbody(reqt, code)
  21     if reqt.method == "HEAD" then return nil end
  22     if code == 204 or code == 304 then return nil end
  23     if code >= 100 and code < 200 then return nil end
  24     return 1
  25 end
  26
  27 local function request_reader(request, data, startpos)
  28         if not data then
  29                 if request.body then
  30                         request.callback(request.code, t_concat(request.body), request);
  31                 else
  32                         -- Error.. connection was closed prematurely
  33                         request.callback(0, "connection-closed", request);
  34                 end
  35                 destroy_request(request);
  36                 return;
  37         end
  38         if request.state == "body" then
  39                 print("Reading body...")
  40                 if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.responseheaders["content-length"]); end
  41                 if startpos then
  42                         data = data:sub(startpos, -1)
  43                 end
  44                 t_insert(request.body, data);
  45                 if request.bodylength then
  46                         request.havebodylength = request.havebodylength + #data;
  47                         if request.havebodylength >= request.bodylength then
  48                                 -- We have the body
  49                                 if request.callback then
  50                                         request.callback(request.code, t_concat(request.body), request);
  51                                 end
  52                         end
  53                         print("", "Have "..request.havebodylength.." bytes out of "..request.bodylength);
  54                 end
  55         elseif request.state == "headers" then
  56                 print("Reading headers...")
  57                 local pos = startpos;
  58                 local headers = request.responseheaders or {};
  59                 for line in data:sub(startpos, -1):gmatch("(.-)\r\n") do
  60                         startpos = startpos + #line + 2;
  61                         local k, v = line:match("(%S+): (.+)");
  62                         if k and v then
  63                                 headers[k:lower()] = v;
  64                                 print("Header: "..k:lower().." = "..v);
  65                         elseif #line == 0 then
  66                                 request.responseheaders = headers;
  67                                 break;
  68                         else
  69                                 print("Unhandled header line: "..line);
  70                         end
  71                 end
  72                 -- Reached the end of the headers
  73                 request.state = "body";
  74                 if #data > startpos then
  75                         return request_reader(request, data, startpos);
  76                 end
  77         elseif request.state == "status" then
  78                 print("Reading status...")
  79                 local http, code, text, linelen = data:match("^HTTP/(%S+) (%d+) (.-)\r\n()", startpos);
  80                 if not code then
  81                         return request.callback(0, "invalid-status-line", request);
  82                 end
  83
  84                 request.responsecode, request.responseversion = code, http;
  85
  86                 if request.onlystatus or not expectbody(request, tonumber(code)) then
  87                         if request.callback then
  88                                 request.callback(code, nil, request);
  89                         end
  90                         destroy_request(request);
  91                         return;
  92                 end
  93
  94                 request.state = "headers";
  95
  96                 if #data > linelen then
  97                         return request_reader(request, data, linelen);
  98                 end
  99         end
 100 end
 101
 102 function request(u, callback, ex)
 103         local req = url.parse(u);
 104
 105         local custom_headers, body;
 106         local default_headers = { ["Host"] = req.host, ["User-Agent"] = "Prosody XMPP Server" }
 107
 108
 109         if req.userinfo then
 110                 default_headers["Authorization"] = "Basic "..mime.b64(req.userinfo);
 111         end
 112
 113         if ex then
 114                 custom_headers = ex.custom_headers;
 115                 req.onlystatus = ex.onlystatus;
 116                 body = ex.body;
 117                 if body then
 118                         req.method = "POST ";
 119                         default_headers["Content-Length"] = tostring(#body);
 120                         default_headers["Content-Type"] = "application/x-www-form-urlencoded";
 121                 end
 122                 if ex.method then req.method = ex.method; end
 123         end
 124
 125         req.handler, req.conn = server.wraptcpclient(listener, socket.tcp(), req.host, req.port or 80, 0, "*a");
 126         req.write = req.handler.write;
 127         req.conn:settimeout(0);
 128         local ok, err = req.conn:connect(req.host, req.port or 80);
 129         if not ok and err ~= "timeout" then
 130                 return nil, err;
 131         end
 132
 133         req.write((req.method or "GET ")..req.path.." HTTP/1.0\r\n");
 134         local t = { [2] = ": ", [4] = "\r\n" };
 135         if custom_headers then
 136                 for k, v in pairs(custom_headers) do
 137                         t[1], t[3] = k, v;
 138                         req.write(t_concat(t));
 139                         default_headers[k] = nil;
 140                 end
 141         end
 142
 143         for k, v in pairs(default_headers) do
 144                 t[1], t[3] = k, v;
 145                 req.write(t_concat(t));
 146                 default_headers[k] = nil;
 147         end
 148         req.write("\r\n");
 149
 150         if body then
 151                 req.write(body);
 152         end
 153
 154         req.callback = callback;
 155         req.reader = request_reader;
 156         req.state = "status"
 157
 158         listener.register_request(req.handler, req);
 159
 160         return req;
 161 end
 162
 163 function destroy_request(request)
 164         if request.conn then
 165                 request.handler.close()
 166                 listener.disconnect(request.conn, "closed");
 167         end
 168 end
 169
 170 _M.urlencode = urlencode;
 171
 172 return _M;