chinwag-android/app/src/main/java/com/keylesspalace/tusky/BaseActivity.java

/* Copyright 2017 Andrew Dawson
 *
 * This file is a part of Tusky.
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 3 of the
 * License, or (at your option) any later version.
 *
 * Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
 * Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with Tusky; if not,
 * see <http://www.gnu.org/licenses>. */

package com.keylesspalace.tusky;

import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.SystemClock;
import android.preference.PreferenceManager;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.text.Spanned;
import android.util.TypedValue;
import android.view.Menu;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

import java.io.IOException;

import okhttp3.Dispatcher;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class BaseActivity extends AppCompatActivity {
    private static final String TAG = "BaseActivity"; // logging tag

    protected MastodonAPI mastodonAPI;
    protected TuskyAPI tuskyAPI;
    protected Dispatcher mastodonApiDispatcher;
    protected PendingIntent serviceAlarmIntent;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        redirectIfNotLoggedIn();
        createMastodonAPI();
        createTuskyAPI();

        /* There isn't presently a way to globally change the theme of a whole application at
         * runtime, just individual activities. So, each activity has to set its theme before any
         * views are created. */
        if (PreferenceManager.getDefaultSharedPreferences(this).getBoolean("lightTheme", false)) {
            setTheme(R.style.AppTheme_Light);
        }
    }

    @Override
    protected void onDestroy() {
        if(mastodonApiDispatcher != null) mastodonApiDispatcher.cancelAll();
        super.onDestroy();
    }

    @Override
    public void finish() {
        super.finish();
        overridePendingTransitionExit();
    }

    @Override
    public void startActivity(Intent intent) {
        super.startActivity(intent);
        overridePendingTransitionEnter();
    }

    private void overridePendingTransitionEnter() {
        overridePendingTransition(R.anim.slide_from_right, R.anim.slide_to_left);
    }

    private void overridePendingTransitionExit() {
        overridePendingTransition(R.anim.slide_from_left, R.anim.slide_to_right);
    }

    protected SharedPreferences getPrivatePreferences() {
        return getSharedPreferences(getString(R.string.preferences_file_key), Context.MODE_PRIVATE);
    }

    protected String getAccessToken() {
        SharedPreferences preferences = getPrivatePreferences();
        return preferences.getString("accessToken", null);
    }

    protected boolean arePushNotificationsEnabled() {
        SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
        return preferences.getBoolean("notificationsEnabled", true);
    }

    protected String getBaseUrl() {
        SharedPreferences preferences = getPrivatePreferences();
        return "https://" + preferences.getString("domain", null);
    }

    protected void createMastodonAPI() {
        mastodonApiDispatcher = new Dispatcher();

        Gson gson = new GsonBuilder()
                .registerTypeAdapter(Spanned.class, new SpannedTypeAdapter())
                .registerTypeAdapter(StringWithEmoji.class, new StringWithEmojiTypeAdapter())
                .create();

        OkHttpClient okHttpClient = OkHttpUtils.getCompatibleClientBuilder()
                .addInterceptor(new Interceptor() {
                    @Override
                    public Response intercept(Chain chain) throws IOException {
                        Request originalRequest = chain.request();

                        Request.Builder builder = originalRequest.newBuilder();
                        String accessToken = getAccessToken();
                        if (accessToken != null) {
                            builder.header("Authorization", String.format("Bearer %s",
                                    accessToken));
                        }
                        Request newRequest = builder.build();

                        return chain.proceed(newRequest);
                    }
                })
                .dispatcher(mastodonApiDispatcher)
                .build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(getBaseUrl())
                .client(okHttpClient)
                .addConverterFactory(GsonConverterFactory.create(gson))
                .build();

        mastodonAPI = retrofit.create(MastodonAPI.class);
    }

    protected void createTuskyAPI() {
        if (BuildConfig.USES_PUSH_NOTIFICATIONS) {
            Retrofit retrofit = new Retrofit.Builder()
                    .baseUrl(getString(R.string.tusky_api_url))
                    .client(OkHttpUtils.getCompatibleClient())
                    .build();

            tuskyAPI = retrofit.create(TuskyAPI.class);
        }
    }

    protected void redirectIfNotLoggedIn() {
        SharedPreferences preferences = getPrivatePreferences();
        String domain = preferences.getString("domain", null);
        String accessToken = preferences.getString("accessToken", null);
        if (domain == null || accessToken == null) {
            Intent intent = new Intent(this, LoginActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
            startActivity(intent);
            finish();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        TypedValue value = new TypedValue();
        int color;
        if (getTheme().resolveAttribute(R.attr.toolbar_icon_tint, value, true)) {
            color = value.data;
        } else {
            color = Color.WHITE;
        }
        for (int i = 0; i < menu.size(); i++) {
            Drawable icon = menu.getItem(i).getIcon();
            if (icon != null) {
                icon.setColorFilter(color, PorterDuff.Mode.SRC_ATOP);
            }
        }
        return super.onCreateOptionsMenu(menu);
    }

    protected void enablePushNotifications() {
        if (BuildConfig.USES_PUSH_NOTIFICATIONS) {
            String token = com.google.firebase.iid.FirebaseInstanceId.getInstance().getToken();
            tuskyAPI.register(getBaseUrl(), getAccessToken(), token).enqueue(new Callback<ResponseBody>() {
                @Override
                public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
                    Log.d(TAG, "Enable push notifications response: " + response.message());
                }

                @Override
                public void onFailure(Call<ResponseBody> call, Throwable t) {
                    Log.d(TAG, "Enable push notifications failed: " + t.getMessage());
                }
            });
        } else {
            // Start up the MessagingService on a repeating interval for "pull" notifications.
            long checkInterval = 60 * 1000 * 5;
            AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            Intent intent = new Intent(this, MessagingService.class);
            final int SERVICE_REQUEST_CODE = 8574603; // This number is arbitrary.
            serviceAlarmIntent = PendingIntent.getService(this, SERVICE_REQUEST_CODE, intent,
                    PendingIntent.FLAG_UPDATE_CURRENT);
            alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                    SystemClock.elapsedRealtime(), checkInterval, serviceAlarmIntent);
        }
    }

    protected void disablePushNotifications() {
        if (BuildConfig.USES_PUSH_NOTIFICATIONS) {
            tuskyAPI.unregister(getBaseUrl(), getAccessToken()).enqueue(new Callback<ResponseBody>() {
                @Override
                public void onResponse(Call<ResponseBody> call, retrofit2.Response<ResponseBody> response) {
                    Log.d(TAG, "Disable push notifications response: " + response.message());
                }

                @Override
                public void onFailure(Call<ResponseBody> call, Throwable t) {
                    Log.d(TAG, "Disable push notifications failed: " + t.getMessage());
                }
            });
        } else if (serviceAlarmIntent != null) {
            // Cancel the repeating call for "pull" notifications.
            AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
            alarmManager.cancel(serviceAlarmIntent);
        }
    }
}