waffle/lib/extensions/defaultError.js

シンプルなWEBアプリケーションフレームワークです。(ALL YOUR NODE ARE BELONG TO US)

/*
 * Copyright 2012 Katsunori Koyanagi
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
/**
 * @overview デフォルトのエラーページ用のコントローラです。
 */

"use strict";

var Lang = require("../utils/Lang");
var ejs = require("ejs");
var fs = require("fs");
var statusCodes = require("http").STATUS_CODES;

var path = fs.join(__dirname, "../assets/error.ejs");
var template = fs.readFileSync(path, "UTF-8");
var compiled = ejs.compile(template, {
	filename : path
});

/**
 * 全てのエラーをフックして標準のエラーページのHTMLを出力するコントローラです。
 * 
 * @example <code>
 * var waffle = require("waffle");
 * config.router.on(waffle.entensions.defaultError);
 * </code>
 * @name Extensions#defaultError
 * @type Function
 */
function controller(context) {
	var title = context.res.statusCode + " "
			+ statusCodes[context.res.statusCode];
	var error = context.errorInfo;
	var stack = Lang.isError(error) ? error.stack : "";
	var message = Lang.isError(error) ? error.message : error ? String(error)
			: title;

	var locals = {
		title : title,
		stack : stack,
		message : message
	};

	var buf = new Buffer(compiled.call(context, locals));
	context.res.setHeader("Content-Length", buf.length);
	context.res.write(buf);
	context.complete();
}

//
// expose
//
module.exports = function(parameter, context) {
	if (Lang.isNumber(parameter) && context.errorInfo != null) {
		return controller;
	}

	return null;
};