Missing grant_type when refreshing the eclipse access token

[netomi]

The logs show exceptions like these:

org.springframework.web.client.HttpClientErrorException$BadRequest: 400 Bad Request on POST request for "https://auth.eclipse.org/auth/realms/community/protocol/openid-connect/token": "{"error":"invalid_request","error_description":"Missing form parameter: grant_type"}"

Recently the Eclipse oauth provider was switched from drupal to keycloak, which only supports POST data encoded in application/x-www-form-urlencoded instead of application/json as drupal did.

See also:

https://stackoverflow.com/questions/53795179/keycloak-missing-form-parameter-grant-type

[netomi]

Need to change the way the body is encoded in https://github.com/eclipse/openvsx/blob/master/server/src/main/java/org/eclipse/openvsx/eclipse/TokenService.java#L120

[netomi]

Documentation from keycloak wrt token exchange: https://www.keycloak.org/securing-apps/token-exchange

[netomi]

actually that happens quite regularly and might be also the cause of various other issues, so we should really get this merged and released asap imho.