OAuth2

oauth2.js

const axios = require('axios');

const flow = {
	google: {
		auth: {
			url: 'https://accounts.google.com/o/oauth2/v2/auth',
			querystring: (params) => `scope=${params.scope}&prompt=${params.prompt}&response_type=${params.response_type}&client_id=${params.client_id}&redirect_uri=${params.redirect_uri}`,
			method: 'get',
			params: ['scope', 'prompt', 'response_type', 'client_id', 'redirect_uri']
		},
		token: {
			url: 'https://oauth2.googleapis.com/token',
			method: 'post',
			headers: {
				'Content-type': 'application/json',
			},
			params: ['code', 'client_id', 'client_secret', 'redirect_uri', 'grant_type']
		},
		userInfo: {
			url: 'https://www.googleapis.com/oauth2/v2/userinfo',
			querystring: (access_token) => `access_token=${access_token}`,
			method: 'get',
			headers: (id_token) => ({ 'Authorization': `Bearer ${id_token}` }),
			params: ['access_token', 'id_token']
		},
		revoke: {
			url: 'https://oauth2.googleapis.com/revoke',
			querystring: (access_token) => `token=${access_token}`,
			method: 'post',
			params: ['access_token']
		}
	},
	github: {
		auth: {
		        url: 'https://github.com/login/oauth/authorize',
		        querystring: (params) => `scope=${params.scope}&client_id=${params.client_id}&redirect_uri=${params.redirect_uri}`,
		        method: 'get',
		        params: ['scope', 'client_id', 'redirect_uri']
		},
		token: {
		        url: 'https://github.com/login/oauth/access_token',
		        method: 'post',
		        headers: {
						'Accept': 'application/json',
		                'Content-type': 'application/json',
		        },
		        params: ['code', 'client_id', 'client_secret']
		},
		userInfo: {
		        url: 'https://api.github.com/user',
		        method: 'get',
		        headers: (access_token) => ({ 'Authorization': `Bearer ${access_token}` }),
		        params: ['access_token']
		}
	}
};

exports.generateAuthUrl = function (provider, obj) {
	const url = flow[provider].auth.url;
	return `${url}?${flow[provider].auth.querystring(obj)}`;
};

exports.generateToken = async function (provider, obj) {
	const options = {
		url: flow[provider].token.url,
		method: flow[provider].token.method,
		headers: flow[provider].token.headers,
		data: obj
	};
	const response = await axios(options);
	return response.data;
};

exports.getUserInfo = async function (provider, obj) {
	let options;
	if (provider === 'google') {
		options = {
			url: `${flow[provider].userInfo.url}?${flow[provider].userInfo.querystring(obj.access_token)}`,
			method: flow[provider].userInfo.method,
			headers: flow[provider].userInfo.headers(obj.id_token)
		}
	}
	if (provider === 'github') {
		options = {
			url: `${flow[provider].userInfo.url}`,
			method: flow[provider].userInfo.method,
			headers: flow[provider].userInfo.headers(obj.access_token)
		}
	}
	const response = await axios(options);
	return response.data;
};

exports.revoke = async function (provider, obj) {
	const options = {
		url: `${flow[provider].revoke.url}?${flow[provider].revoke.querystring(obj.access_token)}`,
		method: flow[provider].revoke.method
	}
	const response = await axios(options);
	return response.data;
};