lambda-github

'use strict'

const https = require('https');

const data = JSON.stringify({});

const getOptions = (code) => {
    return {
        host: 'github.com',
        method: 'POST',
        path: '/login/oauth/access_token?code=' + code + '&client_id=CLIENT_ID&client_secret=CLIENT_SECRET',
        headers: {
            Accept: 'application/json',
            'Content-Type': 'application/json',
            'Content-Length': data.length
        }
    };
    
};

exports.handler = (event, context, callback) => {
    console.log('Enter lambda with URI: ' + event.Records[0].cf.request.uri);
    const request = event.Records[0].cf.request;

    if (request.uri !== '/api/github-login') {
        console.log('Skip lambda for request URI: ' + request.uri);

        callback(null, request);
        return;
    }

    const { code } = event.queryStringParameters;
    const options = getOptions(code);
    console.log('fetching Github token for code ' + code);

    const req = https.request(options, (res) => {
       res.setEncoding('utf8');
       res.on('data', (chunk) => {
            const response = {
                body: JSON.parse(chunk),
                status: 200
            };

            callback(null, response);
       });

    });

    req.on('error', (e) => {
        console.error('fetching Github token failed with message ' + e.message);
        const response = {
            status: '500',
            statusDescription: 'Error while fetching github token',
                headers: {
                'cache-control': [{
                    key: 'Cache-Control',
                    value: 'max-age=100'
                }],
                'content-type': [{
                    key: 'Content-Type',
                    value: 'application/json'
                }],
                'content-encoding': [{
                    key: 'Content-Encoding',
                    value: 'UTF-8'
                }]
            },
            body: JSON.stringify({
                message: e.message
            }),
        };

        callback(e.message, response);
    });

    req.write(data);
    req.end();
};