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  4. Auth Code Flow pt. 2

Auth Code Flow pt. 2

This is the second of two requests that need to be made to complete the Authorization Code Flow.

In this step the Authorization Code that was returned in step 1 will be exchanged for a token set containing Access, Refresh and ID Tokens.

Note that the access token returned is different to the access token generated via the OAuth 2.0 Tokens API. Therefore it can not be used to authorize API calls against other endpoints such as Users or Events.

Resource URL

https://<subdomain>.onelogin.com/oidc/2/token

Header Parameter

Authorization

string

Required if Token Endpoint Authentication Method is set to Basic

Set to Basic <base64 encoded "clientId:clientSecret">.

The client_id and client_secret are generated when you configure your OpenId Connect app in OneLogin.

e.g. Using Node.js this would be 

new Buffer(`${this.client_id}:${this.client_secret}`).toString('base64');

Content-Type

required

string

application/x-www-form-urlencoded

Resource Parameter

subdomain

required

string

Set to the subdomain of your OneLogin instance.

e.g. oidc-sample where the instance is https://oidc-sample.onelogin.com

Request Parameter

grant_type

required

string

Set to “authorization_code”

code

required

string

The authorization code returned after a successful authentication via the Authorization Flow.

redirect_uri

required

string

The redirect uri that is registered with OneLogin for this OpenId Connect app.

client_id

string

The OneLogin generated Client ID for your OpenID Connect app.

Required if Token Endpoint Authentication method is set to POST or none (PKCE).

client_secret

string

The OneLogin generated Client Secret for your OpenID Connect app.

Required if Token Endpoint Authentication method is set to POST.

code_verifier

string

The plain text string that was sent as the code_challenge in step 1 of the Auth Flow.

Required when Token Endpoint Authentication Method is set to none (PKCE).

Sample Request Body

grant_type=authorization_code&code=xxxxxx&redirect_uri=https://myapp.com/callback

Sample Response

  • 200 OK
  • 400 Bad Request
  • 401 Unauthorized
{
    "access_token": "NWE4Nzg2ZDEtNzQyMS00ZDViLThjMjctMGQwNjlmZjU5MWNkBGjFElT7CWzl0d....",
    "expires_in": 3600,
    "id_token": "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IkpSY080bnhzNWpnYzhZZE43STJoTE80V...",
    "token_type": "Bearer",
    "refresh_token": "897987AGBEtNzQyMS00ZDViLThjMjctMGQwNjlmZjU5MWNkBGjFElT7CWzl0d...."
}

Probably an invalid client_id

{
    "error": "invalid_request",
    "error_description": "Resource not found"
}

The grant has been used or has expired

{
    "error": "invalid_grant",
    "error_description": "grant request is invalid"
}

Missing the redirect_uri

{
    "error": "invalid_request",
    "error_description": "missing required parameter(s). (redirect_uri)"
}

The authorization header is invalid

{
    "error": "invalid_request",
    "error_description": "invalid authorization header value format"
}
{
    "error": "invalid_request",
    "error_description": "Authentication Failed"
}
{
    "error": "invalid_request",
    "error_description": "Access is unauthorized"
}

Response Elements

access_token A JSON Web Token (JWT) that represents the session that has just been created for the user.

For example the body of the JWT contains:

{
  "jti": "s0r5Z9z6LTJPs2xP2sipi",
  "iss": "https://acme.onelogin.com/oidc/2",
  "iat": 1534812736,
  "exp": 1534813336,
  "aud": "9a6d6350-2af8-0136-197b-06acc76d34b492920"
}
expires_in The number of seconds until the session expires. Defaults to 3600.
id_token A JSON Web Token (JWT) containing user and scope information for this session
token_type The type of access token. Always set to “Bearer”
refresh_token Only returned if a Refresh Token Timeout period has specified in your OpenId Connect app settings via the OneLogin portal.

Sample Code

cURL

Replace sample values indicated by < > with your actual values.

curl -XPOST "https://<subdomain>.onelogin.com/oidc/2/token" \
-H "Authorization: Basic <base64 encoded client_id:client_secret>" \
-H "Content-Type: application/x-www-form-urlencoded" \
-d "grant_type=authorization_code&code=<authorization code>&redirect_uri=<registered redirect uri>"

Postman Collection

Run In Postman

    Clicking Run in Postman button navigates to the page where you can fork the collection to your workspace. Forking the collection into your workspace will enable you to contribute to the source collection using pull requests. You can also view the collection in a public workspace if you like and even import a copy of the collection using the links present on the screen.

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