prosody
90f663769b75
net/httpserver.lua

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net/httpserver.lua @ 1038:90f663769b75

net.httpserver: Fix potential nil access
author Matthew Wild <mwild1@gmail.com>
date Wed, 22 Apr 2009 20:31:45 +0100
parent 958:172fb9a73017
child 1054:084d265b37cf
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1
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2 local socket = require "socket"
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3 local server = require "net.server"
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4 local url_parse = require "socket.url".parse;
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5
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6 local connlisteners_start = require "net.connlisteners".start;
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7 local connlisteners_get = require "net.connlisteners".get;
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8 local listener;
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9
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10 local t_insert, t_concat = table.insert, table.concat;
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11 local s_match, s_gmatch, s_char = string.match, string.gmatch;
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12 local tonumber, tostring, pairs = tonumber, tostring, pairs;
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13
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14 local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = s_char(tonumber("0x"..k)); return t[k]; end });
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15 local urlencode = function (s) return s and (s:gsub("%W", function (c) return string.format("%%%x", c:byte()); end)); end
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16
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17 local log = require "util.logger".init("httpserver");
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18
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19 local http_servers = {};
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20
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21 module "httpserver"
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22
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23 local default_handler;
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24
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25 local function expectbody(reqt)
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26 return reqt.method == "POST";
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27 end
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28
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29 local function send_response(request, response)
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30 -- Write status line
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31 local resp;
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32 if response.body then
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33 log("debug", "Sending response to %s: %s", request.id, response.body);
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34 resp = { "HTTP/1.0 ", response.status or "200 OK", "\r\n"};
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35 local h = response.headers;
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36 if h then
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37 for k, v in pairs(h) do
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38 t_insert(resp, k);
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39 t_insert(resp, ": ");
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40 t_insert(resp, v);
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41 t_insert(resp, "\r\n");
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42 end
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43 end
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44 if response.body and not (h and h["Content-Length"]) then
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45 t_insert(resp, "Content-Length: ");
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46 t_insert(resp, #response.body);
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47 t_insert(resp, "\r\n");
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48 end
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49 t_insert(resp, "\r\n");
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50
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51 if response.body and request.method ~= "HEAD" then
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52 t_insert(resp, response.body);
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53 end
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54 else
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55 -- Response we have is just a string (the body)
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56 log("debug", "Sending response to %s: %s", request.id, response);
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57
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58 resp = { "HTTP/1.0 200 OK\r\n" };
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59 t_insert(resp, "Connection: close\r\n");
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60 t_insert(resp, "Content-Length: ");
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61 t_insert(resp, #response);
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62 t_insert(resp, "\r\n\r\n");
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63
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64 t_insert(resp, response);
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65 end
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66 request.write(t_concat(resp));
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67 if not request.stayopen then
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68 request:destroy();
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69 end
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70 end
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71
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72 local function call_callback(request, err)
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73 if request.handled then return; end
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74 request.handled = true;
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75 local callback = request.callback;
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76 if not callback and request.path then
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77 local path = request.url.path;
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78 local base = path:match("^/([^/?]+)");
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79 if not base then
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80 base = path:match("^http://[^/?]+/([^/?]+)");
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81 end
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82
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83 callback = (request.server and request.server.handlers[base]) or default_handler;
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84 if callback == default_handler then
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85 log("debug", "Default callback for this request (base: "..tostring(base)..")")
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86 end
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87 end
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88 if callback then
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89 if err then
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90 log("debug", "Request error: "..err);
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91 if not callback(nil, err, request) then
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92 destroy_request(request);
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93 end
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94 return;
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95 end
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96
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97 local response = callback(request.method, request.body and t_concat(request.body), request);
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98 if response then
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99 if response == true and not request.destroyed then
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100 -- Keep connection open, we will reply later
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101 log("warn", "Request %s left open, on_destroy is %s", request.id, tostring(request.on_destroy));
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102 else
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103 -- Assume response
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104 send_response(request, response);
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105 destroy_request(request);
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106 end
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107 else
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108 log("debug", "Request handler provided no response, destroying request...");
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109 -- No response, close connection
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110 destroy_request(request);
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111 end
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112 end
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113 end
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114
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115 local function request_reader(request, data, startpos)
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116 if not data then
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117 if request.body then
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118 call_callback(request);
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119 else
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120 -- Error.. connection was closed prematurely
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121 call_callback(request, "connection-closed");
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122 end
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123 -- Here we force a destroy... the connection is gone, so we can't reply later
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124 destroy_request(request);
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125 return;
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126 end
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127 if request.state == "body" then
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128 log("debug", "Reading body...")
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129 if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.headers["content-length"]); end
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130 if startpos then
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131 data = data:sub(startpos, -1)
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132 end
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133 t_insert(request.body, data);
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134 if request.bodylength then
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135 request.havebodylength = request.havebodylength + #data;
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136 if request.havebodylength >= request.bodylength then
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137 -- We have the body
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diff changeset
138 call_callback(request);
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diff changeset
139 end
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140 end
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diff changeset
141 elseif request.state == "headers" then
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142 log("debug", "Reading headers...")
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143 local pos = startpos;
697
8ddc85fa7602 core.httpserver: Rename request.responseheaders to the more logical request.headers
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diff changeset
144 local headers = request.headers or {};
634
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145 for line in data:gmatch("(.-)\r\n") do
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146 startpos = (startpos or 1) + #line + 2;
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147 local k, v = line:match("(%S+): (.+)");
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148 if k and v then
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149 headers[k:lower()] = v;
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150 -- log("debug", "Header: "..k:lower().." = "..v);
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151 elseif #line == 0 then
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diff changeset
152 request.headers = headers;
634
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153 break;
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154 else
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155 log("debug", "Unhandled header line: "..line);
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156 end
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157 end
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diff changeset
158
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159 if not expectbody(request) then
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160 call_callback(request);
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161 return;
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diff changeset
162 end
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diff changeset
163
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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diff changeset
164 -- Reached the end of the headers
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165 request.state = "body";
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diff changeset
166 if #data > startpos then
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167 return request_reader(request, data:sub(startpos, -1));
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168 end
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169 elseif request.state == "request" then
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170 log("debug", "Reading request line...")
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171 local method, path, http, linelen = data:match("^(%S+) (%S+) HTTP/(%S+)\r\n()", startpos);
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172 if not method then
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173 return call_callback(request, "invalid-status-line");
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174 end
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175
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diff changeset
176 request.method, request.path, request.httpversion = method, path, http;
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177
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178 request.url = url_parse(request.path);
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diff changeset
179
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180 log("debug", method.." request for "..tostring(request.path) .. " on port "..request.handler.serverport());
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181
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diff changeset
182 if request.onlystatus then
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diff changeset
183 if not call_callback(request) then
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parents:
diff changeset
184 return;
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parents:
diff changeset
185 end
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
186 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
187
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188 request.state = "headers";
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diff changeset
189
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
190 if #data > linelen then
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
191 return request_reader(request, data:sub(linelen, -1));
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
192 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
193 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
194 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
195
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
196 -- The default handler for requests
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197 default_handler = function (method, body, request)
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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diff changeset
198 log("debug", method.." request for "..tostring(request.path) .. " on port "..request.handler.serverport());
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
199 return { status = "404 Not Found",
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
200 headers = { ["Content-Type"] = "text/html" },
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
201 body = "<html><head><title>Page Not Found</title></head><body>Not here :(</body></html>" };
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
202 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
203
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
204
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
205 function new_request(handler)
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Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
206 return { handler = handler, conn = handler.socket,
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
207 write = handler.write, state = "request",
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
208 server = http_servers[handler.serverport()],
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
209 send = send_response,
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
210 destroy = destroy_request,
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
211 id = tostring{}:match("%x+$")
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
212 };
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
213 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
214
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
215 function destroy_request(request)
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
216 log("debug", "Destroying request %s", request.id);
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
217 listener = listener or connlisteners_get("httpserver");
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
218 if not request.destroyed then
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
219 request.destroyed = true;
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
220 if request.on_destroy then
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
221 log("debug", "Request has destroy callback");
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
222 request.on_destroy(request);
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
223 else
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
224 log("debug", "Request has no destroy callback");
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
225 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
226 request.handler.close()
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
227 if request.conn then
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
228 listener.disconnect(request.conn, "closed");
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
229 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
230 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
231 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
232
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
233 function new(params)
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
234 local http_server = http_servers[params.port];
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
235 if not http_server then
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
236 http_server = { handlers = {} };
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
237 http_servers[params.port] = http_server;
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
238 -- We weren't already listening on this port, so start now
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
239 connlisteners_start("httpserver", params);
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
240 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
241 if params.base then
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
242 http_server.handlers[params.base] = params.handler;
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
243 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
244 end
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
245
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
246 _M.request_reader = request_reader;
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
247 _M.send_response = send_response;
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
248 _M.urlencode = urlencode;
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
249
1af93ea23f96 Adding initial net.httpserver (lots of work to do on it)
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parents:
diff changeset
250 return _M;