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Golang http client example5/6/2023 You can view the documentation page for the details of the information Github provides to the redirect URL, and the information we need for provide with the POST /login/oauth/access_token HTTP call. We get this access token by making a POST HTTP call to along with the mentioned information. We need this request token and our client secret to get the access token, which is the token that is actually used to get information about the user. In this case, Github adds this as the code parameter, so the redirect URL will actually be something like where mycode123 is the request token. The service provider also adds a request token along with the url. Once the user authenticates with Github, they get redirected to the redirect URL that was specified earlier. Let’s implement it now: Adding a Redirect Route # However, once you authenticate, you will be redirected to which will lead to a 404 page on the server. Once you click on the “Login with github” link, you will be redirected to the familiar OAuth page to register with Github. You can start the server by executing go run main.go and visit You will see the landing page we just made. The following code would go into a new file main.go:įs := http. Next, we need to create the HTTP server to serve the index.html file we just made. Normally, you will have to set this value on the registration portal as well, to prevent anyone from setting malicious callback URLs. Redirect_uri= - specifies the URL to redirect to with the request token, once the user has been authenticated by the service provider. For Github, the portal to register new applications can be found on. On registration, you will receive a client ID (which we are using here as myclientid123), and a client secret (which we will use later on). OAuth service providers normally have a portal in which you can register your consumer. This ID will tell Github about the identity of the consumer who is trying to use their OAuth service. Ĭlient_id=myclientid123 - this specifies the client ID of the application.All OAuth providers have a gateway URL that you have to send the user to in order to proceed. Https///login/oauth/authorize is the OAuth gateway for Github’s OAuth flow. We can create a new file, public/index.html: This will be a basic HTML page, with a link that the user can click on to authenticate with Github. Lets create the first part of the application, which is the landing page. Let’s look at how to implement each part: Creating the Landing Page # Let’s look at an overview of how this would work in practice. In this post, we’ll create a Go HTTP server ( consumer) that uses Github’s OAuth2 API ( service provider) to authenticate the user ( client). The service provider - The external application that authenticates the users identity.The consumer - The application that the client wants to log into (which is Gitlab in this example).The client - The person, or user who is trying to log in.There are three parties in any OAuth mechanism: Here, we are trying to login to Gitlab using Github to authenticate. If you’ve ever seen a dialog like this, then you’ve probably used OAuth before: Let’s take a brief look at the OAuth protocol before we jump into implementation. If you just want to see the code, you can view the full example on Github How OAuth2 Works # We will create a working website that can allow a user to sign in using Github authentication. In this post we will see how we can implement OAuth2 authentication in a Go web application.
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