RestServiceProvider

package rs.pink.klikpink.connectivity;

import retrofit.RequestInterceptor;
import retrofit.RestAdapter;
import retrofit.android.AndroidLog;
import rs.pink.klikpink.BuildConfig;
import rs.pink.klikpink.utility.EncodingUtils;
import rs.pink.klikpink.utility.UserUtils;

public class RestServiceProvider {
    public static final String AUTHORIZATION = "Authorization";
    public static final String ACCEPT = "Accept";
    public static final String APPLICATION_JSON = "application/json";
    private static final String LOG = "KlikPink-LOG";

    public static ApiService getService() {
        String baseURL = BuildConfig.BASE_URL;
        RestAdapter restAdapter = new RestAdapter.Builder()
                .setLogLevel(RestAdapter.LogLevel.FULL).setLog(new AndroidLog(LOG))
                .setRequestInterceptor(new RequestInterceptor() {
                    @Override
                    public void intercept(RequestFacade request) {
                        if (shouldAddAuthentication()) {
                            addBasicAuthentication(request);
                        }
                    }
                })
                .setEndpoint(baseURL).build();
        return restAdapter.create(ApiService.class);

    }

    /**
     * Adding user's credentials to request header in order to achieve Basic Auth
     *
     * @param request - Request that is going to be sent away
     */
    private static void addBasicAuthentication(RequestInterceptor.RequestFacade request) {
        String username = UserUtils.getUsername();
        String password = UserUtils.getPassword();

        String basic = EncodingUtils.createBasicAuthHeader(username, password);
        request.addHeader(AUTHORIZATION, basic);
        request.addHeader(ACCEPT, APPLICATION_JSON);
    }

    /**
     * Determines if Basic Auth should be added to header
     *
     * @return TRUE if should, FALSE otherwise
     */
    private static boolean shouldAddAuthentication() {
        return UserUtils.getUsername() != null;
    }
}