Other OIDC / OAuth 2.0-Compliant Environments

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Other OIDC / OAuth 2.0-Compliant Environments

Civic Auth can be integrated into other environments using any OIDC or OAuth 2.0-compliant client libraries.

The information you will need:

Auth Server URL: https://auth.civic.com/oauth
Client ID: Provided on sign-up at
Scopes: openid,email,profile

The Civic Auth Server

At its core, Civic Auth is an . It supports the grant type with .

If you are looking for other OAuth 2 grant types, we'd like to .

Sample Call to the OAuth Server

To trigger a login process, simply call the oauth server as follows:

https://auth.civic.com/oauth
    ?response_type=code
    &client_id={clientId}
    &redirect_uri={redirectUri}
    &scope=openid,email,profile
    &state={state}
    &code_challenge={codeChallenge}
    &code_challenge_method=S256

Query Parameters:

client_id: Your application's unique identifier provided by Civic Auth.
redirect_uri: The URL to which users should be redirected after authentication.
scope: The permissions your application is requesting (e.g., email, profile, openid).
state: A random string to maintain state between the request and callback.
code_challenge: A code challenge derived from the code verifier for PKCE.

Example

Sample code

index.html

<!DOCTYPE html>
<html>
<body>
<button id="login" disabled onclick="location.href=authURL">login</button>
<div id="information"></div>
</body>

<script>

const libraryCDN = "https://cdn.jsdelivr.net/npm/oauth4webapi@2.10.3/+esm"
const openIdConnectUrl = new URL("https://auth.civic.com/oauth");
const clientId = "YOUR CLIENT ID";
const redirectUri = "https://localhost:3000";
const scope = "openid";

const buttonEl = document.querySelector("#login")
const informationEl = document.querySelector("#information")

var authURL = ""
let as
let codeVerified

import(libraryCDN).then((oauth) => {
  const client = {
    client_id: clientId,
    token_endpoint_auth_method: "none", 
  }
  async function discover(){
    as = await oauth
      .discoveryRequest(openIdConnectUrl, { algorithm: "oidc" })
      .then((response) => oauth.processDiscoveryResponse(openIdConnectUrl, response))
    if (currentURL.searchParams.get("code")) {
      codeVerified = sessionStorage.getItem("code_verifier" )
      getInfo()
    }

    const code_challenge_method = "S256"
    const code_verifier = oauth.generateRandomCodeVerifier()
    sessionStorage.setItem("code_verifier", code_verifier)
    const code_challenge = await oauth.calculatePKCECodeChallenge(code_verifier)

    const authorizationUrl = new URL(as.authorization_endpoint)
    authorizationUrl.searchParams.set("client_id", clientId)
    authorizationUrl.searchParams.set("redirect_uri", redirectUri)
    authorizationUrl.searchParams.set("response_type", "code")
    authorizationUrl.searchParams.set("scope", scope)
    authorizationUrl.searchParams.set("code_challenge", code_challenge)
    authorizationUrl.searchParams.set("code_challenge_method", code_challenge_method)
    
    authURL = authorizationUrl.href
  }
  
  discover()
  async function getInfo(){
    const currentUrl = new URL(location.href)
    const params = oauth.validateAuthResponse(as, client, currentUrl)
    
    if (oauth.isOAuth2Error(params)) {
      throw new Error() // Handle OAuth 2.0 redirect error
    }

    const response = await oauth.authorizationCodeGrantRequest(
      as,
      client,
      params,
      redirectUri,
      codeVerified,
    )
    const result = await oauth.processAuthorizationCodeOpenIDResponse(as, client, response )

    const { access_token } = result
    const claims = oauth.getValidatedIdTokenClaims(result)

    const { sub } = claims;

    const responseInfo = await oauth.userInfoRequest(as, client, access_token)

    const resultInfo = await oauth.processUserInfoResponse(as, client, sub, responseInfo)
    informationEl.innerText = "Welcome "+resultInfo.preferred_username+" ("+resultInfo.name+")"
  }
})

</script>

</html>

Usage

The Civic Auth SDK is designed to simplify front-end integration, with optimized support for React and Next.js. However, if your frontend uses another framework, you can still retrieve user information after login by inspecting the ID token.

The ID token is produced after completing the login process. A common pattern is for your backend to pass that token to your frontend as a cookie.

Here’s an example of how to access user information in vanilla JavaScript by reading the ID token cookie:

import jwt from "jsonwebtoken";

function getUserFromToken() {
  const cookie = document.cookie
    .split("; ")
    .find(row => row.startsWith("id_token="));

  if (!cookie) return null;

  const token = cookie.split("=")[1];
  return jwt.decode(token);
}

const user = getUserFromToken();
console.log(user); // Log user info or use it in your app