[keycloak-user] Token refresh from Android native app

Corinne Krych corinnekrych at gmail.com
Sun Nov 2 17:30:25 EST 2014

On 02 Nov 2014, at 23:10, Frank French <Frank.French at causeway.com> wrote:

> I’m currently using the browser to initially log in to my app. After the user credentials have been validated I intercept the url containing the code and use that on the resource /realms/myrealm/tokens/access/codes. To convert the code into a token. I am then able to use the embedded access token for subsequent API calls. This works fine until the access token expires. 
> When the access token expires the service returns a 401. At present the only way I can get past this is to redirect the user back to the login page and start the above process again (creates another session). I would only expect to have to do this if the SSO idle timeout and been reached (it hasn’t). I’ve looked through the API docs and found the resource /realms/myrealm/token/refresh. I’ve tried using this resource but have failed miserably. Could someone please explain  how to use this resource or point me somewhere else if I’ve got it completely wrong. 

Access token expires. There is another way to track expiration (rather than the 401) thanks to the expiration date provided when the access token is delivered. Checking if the token is expired:

Be aware that keycloak implements renewal of refresh tokens: every time you renew an access token, you get a new refresh token to update.
Besides, in Keycloak, refresh token also expires. In the case of expired refresh token, the only way forward will be to ask for grant again.

Here is an example on how to issue the request on android:
I think you should go without adding it to header. Be cautious about the query param formatting.

iOS dev

> Example code below. 
> private JWSToken refreshToken(String accessToken, String refreshToken) throws IOException, InvalidTokenException{
>       JWSToken token = null;
>       String url = "";
>       //String query = “refresh_token=“ + refreshToken; 
>       //String query = “refresh_token=“ + refreshToken + “client_id=" + CLIENT_ID";
>       String query = "refresh_token=" + refreshToken + "client_id=" + CLIENT_ID + "grant_type=refresh_token";
>       //Tried all the above
>       HttpPost httppost = new HttpPost(url);
>       httppost.addHeader(“Authorization”, “Bearer “ + accessToken); //401 with 400 without
>       httppost.addHeader("Content-Type", "application/x-www-form-urlencoded");
>       ByteArrayEntity entity = new ByteArrayEntity(query.getBytes());
>       httppost.setEntity(entity);
>       HttpResponse response = httpclient.execute(httppost);
>       int status = response.getStatusLine().getStatusCode();
>       if (status == HttpStatus.SC_OK){
>          InputStream stream = null;
>          try{
>             stream = response.getEntity().getContent();
>             ObjectMapper mapper = new ObjectMapper();
>             token = mapper.readValue(stream, JWSToken.class);
>          }finally{
>             if (stream != null){
>                stream.close();
>             }
>          }
>       }else{
>          throw new InvalidTokenException();
>       }
>       return token;
>    }
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