SignInPresenter.java

package com.arellomobile.mvp.sample.github.mvp.presenters;

import android.text.TextUtils;
import android.util.Base64;

import com.arellomobile.mvp.InjectViewState;
import com.arellomobile.mvp.sample.github.R;
import com.arellomobile.mvp.sample.github.app.GithubApp;
import com.arellomobile.mvp.sample.github.common.Utils;
import com.arellomobile.mvp.sample.github.mvp.GithubService;
import com.arellomobile.mvp.sample.github.mvp.common.AuthUtils;
import com.arellomobile.mvp.sample.github.mvp.views.SignInView;

import javax.inject.Inject;

import rx.Subscription;

/**
 * Date: 15.01.2016
 * Time: 18:33
 *
 * @author Yuri Shmakov
 */
@InjectViewState
public class SignInPresenter extends BasePresenter<SignInView> {

	@Inject
	GithubService mGithubService;

	public SignInPresenter() {
		GithubApp.getAppComponent().inject(this);
	}

	public void signIn(String email, String password) {

		Integer emailError = null;
		Integer passwordError = null;

		getViewState().hideFormError();

		if (TextUtils.isEmpty(email)) {
			emailError = R.string.error_field_required;
		}

		if (TextUtils.isEmpty(password)) {
			passwordError = R.string.error_invalid_password;
		}

		if (emailError != null || passwordError != null) {
			getViewState().showFormError(emailError, passwordError);
			return;
		}

		getViewState().startSignIn();

		String credentials = String.format("%s:%s", email, password);

		final String token = "Basic " + Base64.encodeToString(credentials.getBytes(), Base64.NO_WRAP);

		Subscription subscription = mGithubService.signIn(token)
				.doOnNext(user -> AuthUtils.setToken(token))
				.compose(Utils.applySchedulers())
				.subscribe(user -> {
					getViewState().finishSignIn();
					getViewState().successSignIn();
				}, exception -> {
					getViewState().finishSignIn();
					getViewState().failedSignIn(exception.getMessage());
				});

		unsubscribeOnDestroy(subscription);
	}

	public void onErrorCancel() {
		getViewState().hideError();
	}
}