Adding initial net.httpserver (lots of work to do on it)

1 files changed, 250 insertions, 0 deletions

diff --git a/net/httpserver.lua b/net/httpserver.lua
new file mode 100644
index 00000000..3a3c34b4
--- /dev/null
+++ b/net/httpserver.lua
@@ -0,0 +1,250 @@
+
+local socket = require "socket"
+local server = require "net.server"
+local url_parse = require "socket.url".parse;
+
+local connlisteners_start = require "net.connlisteners".start;
+local connlisteners_get = require "net.connlisteners".get;
+local listener;
+
+local t_insert, t_concat = table.insert, table.concat;
+local s_match, s_gmatch = string.match, string.gmatch;
+local tonumber, tostring, pairs = tonumber, tostring, pairs;
+
+local urlcodes = setmetatable({}, { __index = function (t, k) t[k] = char(tonumber("0x"..k)); return t[k]; end });
+local urlencode = function (s) return s and (s:gsub("%W", function (c) return string.format("%%%x", c:byte()); end)); end
+
+local log = require "util.logger".init("httpserver");
+
+local http_servers = {};
+
+module "httpserver"
+
+local default_handler;
+
+local function expectbody(reqt)
+    return reqt.method == "POST";
+end
+
+local function send_response(request, response)
+	-- Write status line
+	local resp;
+	if response.body then
+		log("debug", "Sending response to %s: %s", request.id, response.body);
+		resp = { "HTTP/1.0 ", response.status or "200 OK", "\r\n"};
+		local h = response.headers;
+		if h then
+			for k, v in pairs(h) do
+				t_insert(resp, k);
+				t_insert(resp, ": ");
+				t_insert(resp, v);
+				t_insert(resp, "\r\n");
+			end
+		end
+		if response.body and not (h and h["Content-Length"]) then
+			t_insert(resp, "Content-Length: ");
+			t_insert(resp, #response.body);
+			t_insert(resp, "\r\n");
+		end
+		t_insert(resp, "\r\n");
+		
+		if response.body and request.method ~= "HEAD" then
+			t_insert(resp, response.body);
+		end
+	else
+		-- Response we have is just a string (the body)
+		log("debug", "Sending response to %s: %s", request.id, response);
+		
+		resp = { "HTTP/1.0 200 OK\r\n" };
+		t_insert(resp, "Connection: close\r\n");
+		t_insert(resp, "Content-Length: ");
+		t_insert(resp, #response);
+		t_insert(resp, "\r\n\r\n");
+		
+		t_insert(resp, response);
+	end
+	request.write(t_concat(resp));
+	if not request.stayopen then
+		request:destroy();
+	end
+end
+
+local function call_callback(request, err)
+	if request.handled then return; end
+	request.handled = true;
+	local callback = request.callback;
+	if not callback and request.path then
+		local path = request.url.path;
+		local base = path:match("^/([^/?]+)");
+		if not base then
+			base = path:match("^http://[^/?]+/([^/?]+)");
+		end
+		
+		callback = (request.server and request.server.handlers[base]) or default_handler;
+		if callback == default_handler then
+			log("debug", "Default callback for this request (base: "..tostring(base)..")")
+		end
+	end
+	if callback then
+		if err then
+			log("debug", "Request error: "..err);
+			if not callback(nil, err, request) then
+				destroy_request(request);
+			end
+			return;
+		end
+		
+		local response = callback(request.method, request.body and t_concat(request.body), request);
+		if response then
+			if response == true then
+				-- Keep connection open, we will reply later
+				log("warn", "Request %s left open, on_destroy is %s", request.id, tostring(request.on_destroy));
+			else
+				-- Assume response
+				send_response(request, response);
+				destroy_request(request);
+			end
+		else
+			log("debug", "Request handler provided no response, destroying request...");
+			-- No response, close connection
+			destroy_request(request);
+		end
+	end
+end
+
+local function request_reader(request, data, startpos)
+	if not data then
+		if request.body then
+			call_callback(request);
+		else
+			-- Error.. connection was closed prematurely
+			call_callback(request, "connection-closed");
+		end
+		-- Here we force a destroy... the connection is gone, so we can't reply later
+		destroy_request(request);
+		return;
+	end
+	if request.state == "body" then
+		log("debug", "Reading body...")
+		if not request.body then request.body = {}; request.havebodylength, request.bodylength = 0, tonumber(request.responseheaders["content-length"]); end
+		if startpos then
+			data = data:sub(startpos, -1)
+		end
+		t_insert(request.body, data);
+		if request.bodylength then
+			request.havebodylength = request.havebodylength + #data;
+			if request.havebodylength >= request.bodylength then
+				-- We have the body
+				call_callback(request);
+			end
+		end
+	elseif request.state == "headers" then
+		log("debug", "Reading headers...")
+		local pos = startpos;
+		local headers = request.responseheaders or {};
+		for line in data:gmatch("(.-)\r\n") do
+			startpos = (startpos or 1) + #line + 2;
+			local k, v = line:match("(%S+): (.+)");
+			if k and v then
+				headers[k:lower()] = v;
+--				log("debug", "Header: "..k:lower().." = "..v);
+			elseif #line == 0 then
+				request.responseheaders = headers;
+				break;
+			else
+				log("debug", "Unhandled header line: "..line);
+			end
+		end
+		
+		if not expectbody(request) then 
+			call_callback(request);
+			return;
+		end
+		
+		-- Reached the end of the headers
+		request.state = "body";
+		if #data > startpos then
+			return request_reader(request, data:sub(startpos, -1));
+		end
+	elseif request.state == "request" then
+		log("debug", "Reading request line...")
+		local method, path, http, linelen = data:match("^(%S+) (%S+) HTTP/(%S+)\r\n()", startpos);
+		if not method then
+			return call_callback(request, "invalid-status-line");
+		end
+		
+		request.method, request.path, request.httpversion = method, path, http;
+		
+		request.url = url_parse(request.path);
+		
+		log("debug", method.." request for "..tostring(request.path) .. " on port "..request.handler.serverport());
+		
+		if request.onlystatus then
+			if not call_callback(request) then
+				return;
+			end
+		end
+		
+		request.state = "headers";
+		
+		if #data > linelen then
+			return request_reader(request, data:sub(linelen, -1));
+		end
+	end
+end
+
+-- The default handler for requests
+default_handler = function (method, body, request)
+	log("debug", method.." request for "..tostring(request.path) .. " on port "..request.handler.serverport());
+	return { status = "404 Not Found", 
+			headers = { ["Content-Type"] = "text/html" },
+			body = "<html><head><title>Page Not Found</title></head><body>Not here :(</body></html>" };
+end
+
+
+function new_request(handler)
+	return { handler = handler, conn = handler.socket, 
+			write = handler.write, state = "request", 
+			server = http_servers[handler.serverport()],
+			send = send_response,
+			destroy = destroy_request,
+			id = tostring{}:match("%x+$")
+			 };
+end
+
+function destroy_request(request)
+	log("debug", "Destroying request %s", request.id);
+	listener = listener or connlisteners_get("httpserver");
+	if not request.destroyed then
+		request.destroyed = true;
+		if request.on_destroy then
+			log("debug", "Request has destroy callback");
+			request.on_destroy(request);
+		else
+			log("debug", "Request has no destroy callback");
+		end
+		request.handler.close()
+		if request.conn then
+			listener.disconnect(request.conn, "closed");
+		end
+	end
+end
+
+function new(params)
+	local http_server = http_servers[params.port];
+	if not http_server then
+		http_server = { handlers = {} };
+		http_servers[params.port] = http_server;
+		-- We weren't already listening on this port, so start now
+		connlisteners_start("httpserver", params);
+	end
+	if params.base then
+		http_server.handlers[params.base] = params.handler;
+	end
+end
+
+_M.request_reader = request_reader;
+_M.send_response = send_response;
+_M.urlencode = urlencode;
+
+return _M;