{"id":21999,"date":"2018-06-21T12:15:06","date_gmt":"2018-06-21T09:15:06","guid":{"rendered":"https:\/\/www.webcodegeeks.com\/?p=21999"},"modified":"2018-06-20T12:08:20","modified_gmt":"2018-06-20T09:08:20","slug":"simplified-github-login-ruby-web-app","status":"publish","type":"post","link":"https:\/\/www.webcodegeeks.com\/ruby\/simplified-github-login-ruby-web-app\/","title":{"rendered":"Simplified GitHub Login for a Ruby Web App"},"content":{"rendered":"<p>You know what <a href=\"https:\/\/en.wikipedia.org\/wiki\/OAuth\">OAuth<\/a> login is, right? It&#8217;s when your users click &#8220;login&#8221; and get redirected to Facebook, Twitter, Google, or some other website which then identifies them.<\/p>\n<p>Then they go back to your website and you know who they are. It&#8217;s very convenient for them.<\/p>\n<p>It&#8217;s convenient for you too, since you don&#8217;t need to implement the login functionality and don&#8217;t need to keep their credentials in a database.<\/p>\n<p>I created a simple <a href=\"https:\/\/github.com\/yegor256\/glogin\">Ruby gem<\/a> to simplify this operation for GitHub only. Here is how it works.<\/p>\n<p>First, you will have to register your application in GitHub, as <a href=\"https:\/\/developer.github.com\/apps\/building-integrations\/setting-up-and-registering-oauth-apps\/\">this page<\/a> explains. This is how it works with <a href=\"http:\/\/www.sinatrarb.com\/\">Sinatra<\/a>, but you can do something similar in any framework.<\/p>\n<p>First, somewhere in the global space, before the app starts:<\/p>\n<pre class=\"brush:php\">require 'glogin'\r\nconfigure do\r\n  set :glogin, GLogin::Auth.new(\r\n    # You get this from GitHub, when you register your\r\n    # web application:\r\n    client_id,\r\n    # Make sure this value is coming from a secure\r\n    # place and is NOT visible in the source code:\r\n    client_secret,\r\n    # This is what you will register in GitHub as an\r\n    # authorization callback URL:\r\n    'http:\/\/www.example.com\/github-callback'\r\n  )\r\nend<\/pre>\n<p>Next, for all web pages we need to parse a cookie, if it exists, and convert it into a user:<\/p>\n<pre class=\" brush:php\">require 'sinatra\/cookies'\r\nbefore '\/*' do\r\n  if cookies[:glogin]\r\n    begin\r\n      @user = GLogin::Cookie::Closed.new(\r\n        cookies[:glogin],\r\n        # This must be some long text to be used to\r\n        # encrypt the value in the cookie:\r\n        encryption_secret\r\n      ).to_user\r\n    rescue OpenSSL::Cipher::CipherError =&gt; _\r\n      # Nothing happens here, the user is not logged in.\r\n      cookies.delete(:glogin)\r\n    end\r\n  end\r\nend<\/pre>\n<p>If the <code>glogin<\/code> cookie comes in and contains valid data, a local variable <code>@user<\/code> will be set to something like this:<\/p>\n<pre class=\" brush:php\">{ login: 'yegor256', avatar: 'http:\/\/...' }<\/pre>\n<p>Next, we need a URL for GitHub OAuth callback:<\/p>\n<pre class=\" brush:php\">get '\/github-callback' do\r\n  cookies[:glogin] = GLogin::Cookie::Open.new(\r\n    settings.glogin.user(params[:code]),\r\n    # The same encryption secret that we were using above:\r\n    encryption_secret\r\n  ).to_s\r\n  redirect to('\/')\r\nend<\/pre>\n<p>Finally, we need a logout URL:<\/p>\n<pre class=\" brush:php\">get '\/logout' do\r\n  cookies.delete(:glogin)\r\n  redirect to('\/')\r\nend<\/pre>\n<p>One more thing is the login URL you will need for your front page. Here it is:<\/p>\n<pre class=\" brush:php\">settings.glogin.login_uri<\/pre>\n<p>For unit testing you can just provide an empty string as a <code>secret<\/code> for <code>GLogin::Cookie::Open<\/code> and <code>GLogin::Cookie::Closed<\/code> and the encryption will be disabled: whatever comes from the cookie will be trusted. For testing it will be convenient to provide a user name in a query string, like this:<\/p>\n<pre class=\" brush:php\">http:\/\/localhost:9292\/?glogin=tester<\/pre>\n<p>To enable that, it&#8217;s recommended you add this line (see how it works in <a href=\"https:\/\/github.com\/zold-io\/wts.zold.io\">zold-io\/wts.zold.io<\/a>):<\/p>\n<pre class=\" brush:php\">require 'sinatra\/cookies'\r\nbefore '\/*' do\r\n  cookies[:glogin] = params[:glogin] if params[:glogin]\r\n  if cookies[:glogin]\r\n    # same as above\r\n  end\r\nend<\/pre>\n<p>I use this gem in <a href=\"https:\/\/github.com\/yegor256\/sixnines\">sixnines<\/a>, <a href=\"https:\/\/github.com\/yegor256\/0pdd\">0pdd<\/a>, and <a href=\"https:\/\/github.com\/zold-io\/wts.zold.io\">Zold<\/a> web apps on top of Sinatra (all open source).<\/p>\n<p>&nbsp;<\/p>\n<div class=\"attribution\">\n<table>\n<tbody>\n<tr>\n<td>Published on Web Code Geeks with permission by Yegor Bugayenko, partner at our <a href=\"\/\/www.webcodegeeks.com\/join-us\/wcg\/\" target=\"_blank\" rel=\"noopener\">WCG program<\/a>. See the original article here: <a href=\"https:\/\/www.yegor256.com\/2018\/06\/19\/glogin.html\" target=\"_blank\" rel=\"noopener\">Simplified GitHub Login for a Ruby Web App<\/a><\/p>\n<p>Opinions expressed by Web Code Geeks contributors are their own.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>You know what OAuth login is, right? It&#8217;s when your users click &#8220;login&#8221; and get redirected to Facebook, Twitter, Google, or some other website which then identifies them. Then they go back to your website and you know who they are. It&#8217;s very convenient for them. It&#8217;s convenient for you too, since you don&#8217;t need &hellip;<\/p>\n","protected":false},"author":6534,"featured_media":4128,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[21],"tags":[],"class_list":["post-21999","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ruby"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Simplified GitHub Login for a Ruby Web App - Web Code Geeks - 2026<\/title>\n<meta name=\"description\" content=\"Interested to learn more about Simplified GitHub Login? Then check out our article where we create an OAuth Login Web App for GitHub in Ruby!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.webcodegeeks.com\/ruby\/simplified-github-login-ruby-web-app\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Simplified GitHub Login for a Ruby Web App - Web Code Geeks - 2026\" \/>\n<meta property=\"og:description\" content=\"Interested to learn more about Simplified GitHub Login? 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