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cce0c739b0d7
net/http/server.lua

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net/http/server.lua @ 4668:cce0c739b0d7

net.http.server: Support for wildcard events (events that end with '/*')
author Matthew Wild <mwild1@gmail.com>
date Mon, 23 Apr 2012 21:29:18 +0100
parent 4659:d53142e90cd0
child 4682:9d90c70b6358
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rev   line source
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fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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1
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2 local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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3 local parser_new = require "net.http.parser".new;
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4 local events = require "util.events".new();
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5 local addserver = require "net.server".addserver;
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6 local log = require "util.logger".init("http.server");
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7 local os_date = os.date;
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8 local pairs = pairs;
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9 local s_upper = string.upper;
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10 local setmetatable = setmetatable;
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11 local xpcall = xpcall;
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12 local debug = debug;
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13 local tostring = tostring;
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14 local codes = require "net.http.codes";
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15 local _G = _G;
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16 local legacy_httpserver = require "net.httpserver";
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17
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18 local _M = {};
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19
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20 local sessions = {};
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21 local handlers = {};
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22
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23 local listener = {};
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24
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25 local function is_wildcard_event(event)
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26 return event:sub(-2, -1) == "/*";
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27 end
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28 local function is_wildcard_match(wildcard_event, event)
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29 log("debug", "comparing %q with %q", wildcard_event:sub(1, -2), event:sub(1, #wildcard_event-1));
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30 return wildcard_event:sub(1, -2) == event:sub(1, #wildcard_event-1);
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31 end
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32
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33 local event_map = events._event_map;
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34 setmetatable(events._handlers, {
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35 __index = function (handlers, curr_event)
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36 if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
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37 -- Find all handlers that could match this event, sort them
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38 -- and then put the array into handlers[event]
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39 local matching_handlers_set = {};
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40 local handlers_array = {};
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41 for event, handlers_set in pairs(event_map) do
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42 if event == curr_event or
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43 is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
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44 for handler, priority in pairs(handlers_set) do
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45 matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), priority };
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46 table.insert(handlers_array, handler);
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47 end
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48 end
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49 end
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50 if #handlers_array == 0 then return; end
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51 table.sort(handlers_array, function(b, a)
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52 local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
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53 for i = 1, #a_score do
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54 if a ~= b then -- If equal, compare next score value
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55 return a_score[i] < b_score[i];
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56 end
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57 end
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58 return false;
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59 end);
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60 handlers[curr_event] = handlers_array;
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61 return handlers_array;
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62 end;
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63 __newindex = function (handlers, curr_event, handlers_array)
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64 if handlers_array == nil
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65 and is_wildcard_event(curr_event) then
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66 -- Invalidate all matching
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67 for event in pairs(handlers) do
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68 if is_wildcard_match(curr_event, event) then
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69 handlers[event] = nil;
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70 end
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71 end
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72 end
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73 end;
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74 });
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75
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76 local handle_request;
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77 local _1, _2, _3;
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78 local function _handle_request() return handle_request(_1, _2, _3); end
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79 local function _traceback_handler(err) log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
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80
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81 function listener.onconnect(conn)
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82 local secure = conn:ssl() and true or nil;
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83 local pending = {};
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84 local waiting = false;
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85 local function process_next(last_response)
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86 --if waiting then log("debug", "can't process_next, waiting"); return; end
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87 if sessions[conn] and #pending > 0 then
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88 local request = t_remove(pending);
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89 --log("debug", "process_next: %s", request.path);
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90 waiting = true;
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91 --handle_request(conn, request, process_next);
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92 _1, _2, _3 = conn, request, process_next;
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93 if not xpcall(_handle_request, _traceback_handler) then
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94 conn:write("HTTP/1.0 503 Internal Server Error\r\n\r\nAn error occured during the processing of this request.");
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95 conn:close();
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96 end
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97 else
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98 --log("debug", "ready for more");
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99 waiting = false;
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100 end
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101 end
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102 local function success_cb(request)
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103 --log("debug", "success_cb: %s", request.path);
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104 request.secure = secure;
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105 t_insert(pending, request);
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106 if not waiting then
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107 process_next();
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108 end
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109 end
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110 local function error_cb(err)
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111 log("debug", "error_cb: %s", err or "<nil>");
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112 -- FIXME don't close immediately, wait until we process current stuff
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113 -- FIXME if err, send off a bad-request response
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114 sessions[conn] = nil;
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115 conn:close();
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116 end
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117 sessions[conn] = parser_new(success_cb, error_cb);
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118 end
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119
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120 function listener.ondisconnect(conn)
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121 sessions[conn] = nil;
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122 end
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123
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124 function listener.onincoming(conn, data)
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125 sessions[conn]:feed(data);
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126 end
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127
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128 local headerfix = setmetatable({}, {
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129 __index = function(t, k)
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130 local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
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131 t[k] = v;
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132 return v;
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133 end
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134 });
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135
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136 function _M.hijack_response(response, listener)
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137 error("TODO");
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138 end
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139 function handle_request(conn, request, finish_cb)
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140 --log("debug", "handler: %s", request.path);
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141 local headers = {};
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142 for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
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143 request.headers = headers;
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144 request.conn = conn;
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145
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146 local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
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147 local conn_header = request.headers.connection;
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148 local keep_alive = conn_header == "Keep-Alive" or (request.httpversion == "1.1" and conn_header ~= "close");
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149
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150 local response = {
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151 request = request;
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152 status_code = 200;
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153 headers = { date = date_header, connection = (keep_alive and "Keep-Alive" or "close") };
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154 conn = conn;
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155 send = _M.send_response;
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156 finish_cb = finish_cb;
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157 };
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158
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159 if not request.headers.host then
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160 response.status_code = 400;
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161 response.headers.content_type = "text/html";
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162 response:send("<html><head>400 Bad Request</head><body>400 Bad Request: No Host header.</body></html>");
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163 else
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164 -- TODO call handler
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165 --response.headers.content_type = "text/plain";
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166 --response:send("host="..(request.headers.host or "").."\npath="..request.path.."\n"..(request.body or ""));
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167 local host = request.headers.host;
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168 if host then
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169 host = host:match("[^:]*"):lower();
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170 local event = request.method.." "..host..request.path:match("[^?]*");
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171 local payload = { request = request, response = response };
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172 --[[repeat
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173 if events.fire_event(event, payload) ~= nil then return; end
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174 event = (event:sub(-1) == "/") and event:sub(1, -1) or event:gsub("[^/]*$", "");
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175 if event:sub(-1) == "/" then
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176 event = event:sub(1, -1);
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177 else
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178 event = event:gsub("[^/]*$", "");
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179 end
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180 until not event:find("/", 1, true);]]
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181 --log("debug", "Event: %s", event);
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182 if events.fire_event(event, payload) ~= nil then return; end
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183 -- TODO try adding/stripping / at the end, but this needs to work via an HTTP redirect
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184 if events.fire_event("*", payload) ~= nil then return; end
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185 end
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186
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187 -- if handler not called, fallback to legacy httpserver handlers
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188 _M.legacy_handler(request, response);
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189 end
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190 end
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191 function _M.send_response(response, body)
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192 local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
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193 local headers = response.headers;
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194 body = body or "";
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195 headers.content_length = #body;
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196
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197 local output = { status_line };
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198 for k,v in pairs(headers) do
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199 t_insert(output, headerfix[k]..v);
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200 end
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201 t_insert(output, "\r\n\r\n");
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202 t_insert(output, body);
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203
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204 response.conn:write(t_concat(output));
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205 if headers.connection == "Keep-Alive" then
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206 response:finish_cb();
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207 else
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208 response.conn:close();
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209 end
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210 end
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211 function _M.legacy_handler(request, response)
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212 log("debug", "Invoking legacy handler");
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213 local base = request.path:match("^/([^/?]+)");
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214 local legacy_server = legacy_httpserver and legacy_httpserver.new.http_servers[5280];
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215 local handler = legacy_server and legacy_server.handlers[base];
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216 if not handler then handler = legacy_httpserver and legacy_httpserver.set_default_handler.default_handler; end
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217 if handler then
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218 -- add legacy properties to request object
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219 request.url = { path = request.path };
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220 request.handler = response.conn;
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221 request.id = tostring{}:match("%x+$");
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222 local headers = {};
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223 for k,v in pairs(request.headers) do
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224 headers[k:gsub("_", "-")] = v;
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225 end
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226 request.headers = headers;
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227 function request:send(resp)
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228 if self.destroyed then return; end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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229 if resp.body or resp.headers then
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230 if resp.headers then
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231 for k,v in pairs(resp.headers) do response.headers[k] = v; end
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232 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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233 response:send(resp.body)
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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234 else
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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235 response:send(resp)
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236 end
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237 self.sent = true;
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238 self:destroy();
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239 end
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240 function request:destroy()
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241 if self.destroyed then return; end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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242 if not self.sent then return self:send(""); end
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243 self.destroyed = true;
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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244 if self.on_destroy then
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245 log("debug", "Request has destroy callback");
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246 self:on_destroy();
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247 else
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248 log("debug", "Request has no destroy callback");
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249 end
fc5d3b053454 net.http.{server|codes|parser}: Initial commit.
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250 end
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251 local r = handler(request.method, request.body, request);
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252 if r ~= true then
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253 request:send(r);
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254 end
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255 else
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256 log("debug", "No handler found");
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257 response.status_code = 404;
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258 response.headers.content_type = "text/html";
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259 response:send("<html><head><title>404 Not Found</title></head><body>404 Not Found: No such page.</body></html>");
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260 end
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261 end
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262
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263 function _M.add_handler(event, handler, priority)
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264 events.add_handler(event, handler, priority);
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265 end
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266 function _M.remove_handler(event, handler)
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267 events.remove_handler(event, handler);
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268 end
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269
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270 function _M.listen_on(port, interface, ssl)
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271 addserver(interface or "*", port, listener, "*a", ssl);
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272 end
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273
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274 _M.listener = listener;
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275 _M.codes = codes;
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276 return _M;