app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var session = require('express-session');
var MongoStore = require('connect-mongo')(session);
var flash = require('connect-flash');
var config = require('config-lite')(__dirname);
var routes = require('./routes');
var pkg = require('./package');
var winston = require('winston');
var expressWinston = require('express-winston');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade'); // 模板引擎 jade

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

// 默认模板目录
app.use(express.static(path.join(__dirname, 'public')));

// session
app.use(session({
  name:config.session.key, // 设置cookie中保存session id的字段名称
  secret:config.session.secret, // 通过设置secret来计算hash值并放在cookie中，使产生的signedCookie防篡改
  resave: true,
  saveUninitialized: true,
  cookie: {
    maxAge:config.session.maxAge // 过期时间，过期后cookie中的session id自动删除
  },
  store:new MongoStore({ // 将session存放到mongodb
    db:config.db,
    url:config.mongodb // mongodb地址
  })
}));

// 设置模板全局常量
app.locals.blog = {
  title: pkg.name,
  description: pkg.description
};

// 显示通知中间件
app.use(flash());

// 添加模板必需的三个变量
app.use(function (req, res, next) {
  res.locals.user = req.session.user;
  res.locals.success = req.flash('success').toString();
  res.locals.error = req.flash('error').toString();
  next();
});

// 处理表单及文件上传的中间件
app.use(require('express-formidable')({
  uploadDir: path.join(__dirname, 'public/img'),// 上传文件目录
  keepExtensions: true// 保留后缀
}));

// 路由
routes(app);

// 日志功能
// 正常请求的日志
app.use(expressWinston.logger({
  transports: [
    new (winston.transports.Console)({
      json: true,
      colorize: true
    }),
    new winston.transports.File({
      filename: 'logs/success.log'
    })
  ]
}));

// 错误请求的日志
app.use(expressWinston.errorLogger({
  transports: [
    new winston.transports.Console({
      json: true,
      colorize: true
    }),
    new winston.transports.File({
      filename: 'logs/error.log'
    })
  ]
}));

// catch 404 and forward to error handler
// 404 页面未自定义化
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});


module.exports = app;