casper github login

//CasperJS 객체 생성
var express = require('express');
var app = express();
var casper_nodejs = require('casper-nodejs');

app.get('/auth/github/callback', (req, res, next) => {
    console.log('server callback ok')
    res.json('callback')
})
app.get('/', (req, res, next) => {

    var url = "github url";
    var casper = casper_nodejs.create(url);

    // once the page is loaded, execute that in our current nodejs context
    casper.then(function executed_in_this_context() {
        console.log("page loaded");
    });

    casper.then(function executed_in_casperjs_context() {
        this.evaluate(function executed_in_this_context() {
            document.getElementById("login_field").value = "githubid";
            document.getElementById("password").value = "githubpassword";
            document.querySelector('.btn-primary').click();
        });
    }, function (ret) {
        console.log('first form filled');
    }); 
    casper.then(function executed_in_casperjs_context() {
        return 42;
    }, function executed_in_this_context(ret) {
        console.log("it works: " + ret); 
        // echo results in some pretty fashion 
        res.json('ok')
        casper.exit();
    });

    casper.run();

}) 

app.listen(3000, function () {
    console.log('server start');
})