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JWT Bearer Grant is used to send a JWT token signed by EmpowerID, along with the Client ID and Client Secret of the OAuth application you registered in EmpowerID to the EmpowerID token endpoint in exchange for an access token, a refresh token, and an ID token (when scope=openid). This article describes how to use this grant in your applications.
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You can download sample .NET framework code at https://dl1.empowerid.com/files/OAuthTestSamplecode.zip |
JWT (JSON Web Token) Bearer Grant
1. Initiate a request to the EmpowerID Token endpoint, https://<EID Server>/oauth/v2/token
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POST /oauth/v2/token HTTP/1.1
Host: <EID Server>
Content-Type: application/x-www-form-urlencoded
Cache-Control: no-cache
client_id={The Client ID of the OAuth app you registered in EmpowerID}
&client_secret={The Client Secret of the OAuth app you registered in EmpowerID}
&grant_type=urn:ietf:params:oauth:grant-type:jwt-bearer
&assertion=xxxxxxxxxxxxxxxxxx
&scope=openid |
Header Parameter | Required/Optional | Description |
|---|---|---|
| required | Must be |
Post Body Parameter | Required/Optional | Description |
|---|---|---|
| required | Must be the EmpowerID OAuth application client identifier. |
| required | Must be the EmpowerID OAuth application client secret. |
| required | Must be |
| required | A space-separated list of strings that the user consents to. Values include |
| required | Must be JWT assertion string. Please refer to the Generate JWT Assertion section below. |
2. Returns access token and refresh token (optionally ID token) in the response
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{
"access_token": "xxxxxxxxxxxxxxxxxxxxxx",
"token_type": "Bearer",
"expires_in": 3600,
"refresh_token": "xxxxxxxxxxxxxxxxxxxxxx",
"id_token": "xxxxxxxxxxxxxxxxxxxxxx",
"id": "xxxxxxxxxxxxxxxxxxxxxx"
} |
Generate JWT Assertion
The JWT assertion should follow the below format and be signed with the signing certificate and converted to Base64 string - base64(sign(<JWT Assertion>))
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{
Issuer: <EmpowerID OAuth application client identifier>
Subject: <Signing Certificate Thumbprint>
Audience: https://<EID Server>/WebIdPForms/OAuth/v2
IssuedAt: UnixTime(DateTime.UtcNow)
NotBefore: UnixTime(DateTime.UtcNow – 5 minutes)
Expiration: UnixTime(DateTime.UtcNow + 5 minutes)
} |
JWT Bearer Grant using .NET Client Library
1. Initialize ClientSettings by passing the client_id, client_secret, redirect_uri, token_endpoint, authorization_endpoint, tokeninfo_endpoint and userinfo_endpoint. Also initialize a new JWTBearerGrant by passing the clientSettings model.
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var clientSettings = new ClientSettings( “client_id”, “client_secret”, “redirect_uri”, “https://<EID Server>/oauth/v2/token”, “https://<EID Server>/oauth/v2/ui/authorize”, “https://<EID Server>/oauth/v2/tokeninfo”, “https://<EID Server>/oauth/v2/userinfo”); var handler = new JWTBearerGrant (clientSettings); |
2. Call the GetAccessToken() method to retrieve the access_token, refresh_token, and other token related information.
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AccessTokenResponseModel responseModel = null;
String certificateThumbprint= “xxxxxxxxxxxxxxxxxxxxx”;
try
{
var signingCert = handler.GetSigningCertificate(certificateThumbprint);
responseModel = handler.GetAccessToken<AccessTokenResponseModel>
(RequestMethod.POST,
ParameterFormat.Json,
signingCert);
}
catch (Exception e)
{
//Handle error
} |
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