datahub/datahub-frontend/app/auth/sso/oidc/OidcResponseErrorHandler.java

package auth.sso.oidc;

import org.pac4j.play.PlayWebContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import play.mvc.Result;

import static play.mvc.Results.internalServerError;
import static play.mvc.Results.unauthorized;


public class OidcResponseErrorHandler {
    private static final Logger _logger = LoggerFactory.getLogger("OidcResponseErrorHandler");

    private static final String ERROR_FIELD_NAME = "error";
    private static final String ERROR_DESCRIPTION_FIELD_NAME = "error_description";

    public static Result handleError(final PlayWebContext context) {

        _logger.warn("OIDC responded with an error: '{}'. Error description: '{}'",
                getError(context),
                getErrorDescription(context));

        if (getError(context).equals("access_denied")) {
            return unauthorized(String.format("Access denied. " +
                            "The OIDC service responded with 'Access denied'. " +
                            "It seems that you don't have access to this application yet. Please apply for access. \n\n" +
                            "If you already have been assigned this application, it may be so that your OIDC request is still in action. " +
                            "Error details: '%s':'%s'",
                    context.getRequestParameter("error"),
                    context.getRequestParameter("error_description")));
        }

        return internalServerError(
                String.format("Internal server error. The OIDC service responded with an error: '%s'.\n" +
                                "Error description: '%s'",
                getError(context),
                getErrorDescription(context)));
    }

    public static boolean isError(final PlayWebContext context) {
        return getError(context) != null && !getError(context).isEmpty();
    }

    public static String getError(final PlayWebContext context) {
        return context.getRequestParameter(ERROR_FIELD_NAME);
    }

    public static String getErrorDescription(final PlayWebContext context) {
        return context.getRequestParameter(ERROR_DESCRIPTION_FIELD_NAME);
    }
}