const imageCaptch = require('svg-captcha')
const express = require('express')
const session = require('express-session')
const bodyParser = require('body-parser')
const app = express()

app.all('*', (req, res, next) => {
    res.header("Access-Control-Allow-Origin", req.headers.origin); //设置来源
    res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
    res.header("Access-Control-Allow-Methods", "PUT,POST,GET,DELETE,OPTIONS");
    res.header("Access-Control-Max-Age", "604800000");
    res.header("Access-Control-Allow-Credentials", true);
    res.header("X-Powered-By", ' 3.2.1');
    // res.header("Content-Type", "application/json;charset=utf-8");
    next();
});

app.use(session({
    secret: 'captcha',
    cookie: {
        maxAge: 300000
    },
    saveUninitialized: true,
    resave: true,
    name: 'imageVerification'
}))
app.use(bodyParser.urlencoded({extended:false}))

app.get('/getImage', (req, res) => {
    const svgimg = imageCaptch.create({
        size: 4,
        ignoreChars: 'ABCDEFGHIJKLMNOPQRSTUVWXYZ',
        noise: 2,
        color: true
    })
    req.session.imgtext = svgimg.text
    res.send(svgimg.data)
})

app.post('/postImagetext', (req, res) => {
    if(req.session.imgtext){
        if(req.session.imgtext == req.body.imgtexter){
            res.send({
                seccess: '验证码正确'
            })
        }else{
            res.status(202).send({
                err: '验证码错误'
            })
        }
    }else{
        res.status(203).send({
            err: '未获取验证码'
        })
    }
})

app.listen('9000', () => {
    console.log('service listing port 9000')
})