1 files changed, 273 insertions, 0 deletions
diff --git a/net/http/server.lua b/net/http/server.lua
new file mode 100644
index 00000000..69908e4e
--- /dev/null
+++ b/net/http/server.lua
@@ -0,0 +1,273 @@
+
+local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
+local parser_new = require "net.http.parser".new;
+local events = require "util.events".new();
+local addserver = require "net.server".addserver;
+local log = require "util.logger".init("http.server");
+local os_date = os.date;
+local pairs = pairs;
+local s_upper = string.upper;
+local setmetatable = setmetatable;
+local xpcall = xpcall;
+local debug = debug;
+local tostring = tostring;
+local codes = require "net.http.codes";
+
+local _M = {};
+
+local sessions = {};
+local listener = {};
+local hosts = {};
+local default_host;
+
+local function is_wildcard_event(event)
+	return event:sub(-2, -1) == "/*";
+end
+local function is_wildcard_match(wildcard_event, event)
+	return wildcard_event:sub(1, -2) == event:sub(1, #wildcard_event-1);
+end
+
+local event_map = events._event_map;
+setmetatable(events._handlers, {
+	__index = function (handlers, curr_event)
+		if is_wildcard_event(curr_event) then return; end -- Wildcard events cannot be fired
+		-- Find all handlers that could match this event, sort them
+		-- and then put the array into handlers[curr_event] (and return it)
+		local matching_handlers_set = {};
+		local handlers_array = {};
+		for event, handlers_set in pairs(event_map) do
+			if event == curr_event or
+			is_wildcard_event(event) and is_wildcard_match(event, curr_event) then
+				for handler, priority in pairs(handlers_set) do
+					matching_handlers_set[handler] = { (select(2, event:gsub("/", "%1"))), is_wildcard_event(event) and 0 or 1, priority };
+					table.insert(handlers_array, handler);
+				end
+			end
+		end
+		if #handlers_array > 0 then
+			table.sort(handlers_array, function(b, a)
+				local a_score, b_score = matching_handlers_set[a], matching_handlers_set[b];
+				for i = 1, #a_score do
+					if a_score[i] ~= b_score[i] then -- If equal, compare next score value
+						return a_score[i] < b_score[i];
+					end
+				end
+				return false;
+			end);
+		else
+			handlers_array = false;
+		end
+		rawset(handlers, curr_event, handlers_array);
+		return handlers_array;
+	end;
+	__newindex = function (handlers, curr_event, handlers_array)
+		if handlers_array == nil
+		and is_wildcard_event(curr_event) then
+			-- Invalidate the indexes of all matching events
+			for event in pairs(handlers) do
+				if is_wildcard_match(curr_event, event) then
+					handlers[event] = nil;
+				end
+			end
+		end
+		rawset(handlers, curr_event, handlers_array);
+	end;
+});
+
+local handle_request;
+local _1, _2, _3;
+local function _handle_request() return handle_request(_1, _2, _3); end
+
+local last_err;
+local function _traceback_handler(err) last_err = err; log("error", "Traceback[http]: %s: %s", tostring(err), debug.traceback()); end
+events.add_handler("http-error", function (error)
+	return "Error processing request: "..codes[error.code]..". Check your error log for more information.";
+end, -1);
+
+function listener.onconnect(conn)
+	local secure = conn:ssl() and true or nil;
+	local pending = {};
+	local waiting = false;
+	local function process_next()
+		--if waiting then log("debug", "can't process_next, waiting"); return; end
+		if sessions[conn] and #pending > 0 then
+			local request = t_remove(pending);
+			--log("debug", "process_next: %s", request.path);
+			waiting = true;
+			--handle_request(conn, request, process_next);
+			_1, _2, _3 = conn, request, process_next;
+			if not xpcall(_handle_request, _traceback_handler) then
+				conn:write("HTTP/1.0 500 Internal Server Error\r\n\r\n"..events.fire_event("http-error", { code = 500, private_message = last_err }));
+				conn:close();
+			end
+		else
+			--log("debug", "ready for more");
+			waiting = false;
+		end
+	end
+	local function success_cb(request)
+		--log("debug", "success_cb: %s", request.path);
+		request.secure = secure;
+		t_insert(pending, request);
+		if not waiting then
+			process_next();
+		end
+	end
+	local function error_cb(err)
+		log("debug", "error_cb: %s", err or "<nil>");
+		-- FIXME don't close immediately, wait until we process current stuff
+		-- FIXME if err, send off a bad-request response
+		sessions[conn] = nil;
+		conn:close();
+	end
+	sessions[conn] = parser_new(success_cb, error_cb);
+end
+
+function listener.ondisconnect(conn)
+	local open_response = conn._http_open_response;
+	if open_response and open_response.on_destroy then
+		open_response.finished = true;
+		open_response:on_destroy();
+	end
+	sessions[conn] = nil;
+end
+
+function listener.onincoming(conn, data)
+	sessions[conn]:feed(data);
+end
+
+local headerfix = setmetatable({}, {
+	__index = function(t, k)
+		local v = "\r\n"..k:gsub("_", "-"):gsub("%f[%w].", s_upper)..": ";
+		t[k] = v;
+		return v;
+	end
+});
+
+function _M.hijack_response(response, listener)
+	error("TODO");
+end
+function handle_request(conn, request, finish_cb)
+	--log("debug", "handler: %s", request.path);
+	local headers = {};
+	for k,v in pairs(request.headers) do headers[k:gsub("-", "_")] = v; end
+	request.headers = headers;
+	request.conn = conn;
+
+	local date_header = os_date('!%a, %d %b %Y %H:%M:%S GMT'); -- FIXME use
+	local conn_header = request.headers.connection;
+	local keep_alive = conn_header == "Keep-Alive" or (request.httpversion == "1.1" and conn_header ~= "close");
+
+	local response = {
+		request = request;
+		status_code = 200;
+		headers = { date = date_header, connection = (keep_alive and "Keep-Alive" or "close") };
+		conn = conn;
+		send = _M.send_response;
+		finish_cb = finish_cb;
+	};
+	conn._http_open_response = response;
+
+	local host = (request.headers.host or ""):match("[^:]+");
+
+	-- Some sanity checking
+	local err_code, err;
+	if not request.path then
+		err_code, err = 400, "Invalid path";
+	elseif not hosts[host] then
+		if hosts[default_host] then
+			host = default_host;
+		elseif host then
+			err_code, err = 404, "Unknown host: "..host;
+		else
+			err_code, err = 400, "Missing or invalid 'Host' header";
+		end
+	end
+	
+	if err then
+		response.status_code = err_code;
+		response:send(events.fire_event("http-error", { code = err_code, message = err }));
+		return;
+	end
+
+	local event = request.method.." "..host..request.path:match("[^?]*");
+	local payload = { request = request, response = response };
+	--log("debug", "Firing event: %s", event);
+	local result = events.fire_event(event, payload);
+	if result ~= nil then
+		if result ~= true then
+			local body;
+			local result_type = type(result);
+			if result_type == "number" then
+				response.status_code = result;
+				if result >= 400 then
+					body = events.fire_event("http-error", { code = result });
+				end
+			elseif result_type == "string" then
+				body = result;
+			elseif result_type == "table" then
+				for k, v in pairs(result) do
+					response[k] = v;
+				end
+			end
+			response:send(body);
+		end
+		return;
+	end
+
+	-- if handler not called, return 404
+	response.status_code = 404;
+	response:send(events.fire_event("http-error", { code = 404 }));
+end
+function _M.send_response(response, body)
+	if response.finished then return; end
+	response.finished = true;
+	response.conn._http_open_response = nil;
+	
+	local status_line = "HTTP/"..response.request.httpversion.." "..(response.status or codes[response.status_code]);
+	local headers = response.headers;
+	body = body or response.body or "";
+	headers.content_length = #body;
+
+	local output = { status_line };
+	for k,v in pairs(headers) do
+		t_insert(output, headerfix[k]..v);
+	end
+	t_insert(output, "\r\n\r\n");
+	t_insert(output, body);
+
+	response.conn:write(t_concat(output));
+	if response.on_destroy then
+		response:on_destroy();
+		response.on_destroy = nil;
+	end
+	if headers.connection == "Keep-Alive" then
+		response:finish_cb();
+	else
+		response.conn:close();
+	end
+end
+function _M.add_handler(event, handler, priority)
+	events.add_handler(event, handler, priority);
+end
+function _M.remove_handler(event, handler)
+	events.remove_handler(event, handler);
+end
+
+function _M.listen_on(port, interface, ssl)
+	addserver(interface or "*", port, listener, "*a", ssl);
+end
+function _M.add_host(host)
+	hosts[host] = true;
+end
+function _M.remove_host(host)
+	hosts[host] = nil;
+end
+function _M.set_default_host(host)
+	default_host = host;
+end
+
+_M.listener = listener;
+_M.codes = codes;
+_M._events = events;
+return _M;