Java tutorial
/* * Copyright (C) 2012-2016 Dominik Schrmann <dominik@dominikschuermann.de> * * 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ package org.sufficientlysecure.keychain; import android.accounts.Account; import android.accounts.AccountManager; import android.app.Application; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.PorterDuff; import android.graphics.drawable.Drawable; import android.os.Build; import android.os.Environment; import android.support.annotation.Nullable; import android.widget.Toast; import org.bouncycastle.jce.provider.BouncyCastleProvider; import org.sufficientlysecure.keychain.provider.KeychainDatabase; import org.sufficientlysecure.keychain.provider.TemporaryFileProvider; import org.sufficientlysecure.keychain.service.ContactSyncAdapterService; import org.sufficientlysecure.keychain.service.KeyserverSyncAdapterService; import org.sufficientlysecure.keychain.ui.ConsolidateDialogActivity; import org.sufficientlysecure.keychain.ui.util.FormattingUtils; import org.sufficientlysecure.keychain.util.Log; import org.sufficientlysecure.keychain.util.PRNGFixes; import org.sufficientlysecure.keychain.util.Preferences; import org.sufficientlysecure.keychain.util.TlsHelper; import java.security.Security; import java.util.HashMap; public class KeychainApplication extends Application { /** * Called when the application is starting, before any activity, service, or receiver objects * (excluding content providers) have been created. */ @Override public void onCreate() { super.onCreate(); /* * Sets our own Bouncy Castle library as preferred security provider * * because Android's default provider config has BC at position 3, * we need to remove it and insert BC again at position 1 (above OpenSSLProvider!) * * (insertProviderAt() position starts from 1) */ Security.removeProvider(BouncyCastleProvider.PROVIDER_NAME); Security.insertProviderAt(new BouncyCastleProvider(), 1); /* * apply RNG fixes * * among other things, executes Security.insertProviderAt(new * LinuxPRNGSecureRandomProvider(), 1) for Android <= SDK 17 */ PRNGFixes.apply(); Log.d(Constants.TAG, "Bouncy Castle set and PRNG Fixes applied!"); /* if (Constants.DEBUG) { Provider[] providers = Security.getProviders(); Log.d(Constants.TAG, "Installed Security Providers:"); for (Provider p : providers) { Log.d(Constants.TAG, "provider class: " + p.getClass().getName()); } } */ // Create OpenKeychain directory on sdcard if not existing if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { if (!Constants.Path.APP_DIR.exists() && !Constants.Path.APP_DIR.mkdirs()) { // ignore this for now, it's not crucial // that the directory doesn't exist at this point } } brandGlowEffect(getApplicationContext(), FormattingUtils.getColorFromAttr(getApplicationContext(), R.attr.colorPrimary)); // Add OpenKeychain account to Android to link contacts with keys and keyserver sync createAccountIfNecessary(this); if (Preferences.getKeyserverSyncEnabled(this)) { // will update a keyserver sync if the interval has changed KeyserverSyncAdapterService.enableKeyserverSync(this); } // if first time, enable keyserver and contact sync if (Preferences.getPreferences(this).isFirstTime()) { KeyserverSyncAdapterService.enableKeyserverSync(this); ContactSyncAdapterService.enableContactsSync(this); } // Update keyserver list as needed Preferences.getPreferences(this).upgradePreferences(this); TlsHelper.addPinnedCertificate("hkps.pool.sks-keyservers.net", getAssets(), "hkps.pool.sks-keyservers.net.CA.cer"); TlsHelper.addPinnedCertificate("pgp.mit.edu", getAssets(), "pgp.mit.edu.cer"); TlsHelper.addPinnedCertificate("api.keybase.io", getAssets(), "api.keybase.io.CA.cer"); TemporaryFileProvider.cleanUp(this); if (!checkConsolidateRecovery()) { // force DB upgrade, https://github.com/open-keychain/open-keychain/issues/1334 new KeychainDatabase(this).getReadableDatabase().close(); } } /** * @return the OpenKeychain contact/keyserver sync account if it exists or was successfully * created, null otherwise */ public static @Nullable Account createAccountIfNecessary(Context context) { try { AccountManager manager = AccountManager.get(context); Account[] accounts = manager.getAccountsByType(Constants.ACCOUNT_TYPE); Account account = new Account(Constants.ACCOUNT_NAME, Constants.ACCOUNT_TYPE); if (accounts.length == 0) { if (!manager.addAccountExplicitly(account, null, null)) { Log.d(Constants.TAG, "error when adding account via addAccountExplicitly"); return null; } else { return account; } } else { return accounts[0]; } } catch (SecurityException e) { Log.e(Constants.TAG, "SecurityException when adding the account", e); Toast.makeText(context, R.string.reinstall_openkeychain, Toast.LENGTH_LONG).show(); return null; } } public static HashMap<String, Bitmap> qrCodeCache = new HashMap<>(); @Override public void onTrimMemory(int level) { super.onTrimMemory(level); if (level >= TRIM_MEMORY_UI_HIDDEN) { qrCodeCache.clear(); } } /** * Restart consolidate process if it has been interruped before */ public boolean checkConsolidateRecovery() { if (Preferences.getPreferences(this).getCachedConsolidate()) { Intent consolidateIntent = new Intent(this, ConsolidateDialogActivity.class); consolidateIntent.putExtra(ConsolidateDialogActivity.EXTRA_CONSOLIDATE_RECOVERY, true); consolidateIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(consolidateIntent); return true; } else { return false; } } static void brandGlowEffect(Context context, int brandColor) { // no hack on Android 5 if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) { try { // terrible hack to brand the edge overscroll glow effect // https://gist.github.com/menny/7878762#file-brandgloweffect_full-java //glow int glowDrawableId = context.getResources().getIdentifier("overscroll_glow", "drawable", "android"); Drawable androidGlow = context.getResources().getDrawable(glowDrawableId); androidGlow.setColorFilter(brandColor, PorterDuff.Mode.SRC_IN); //edge int edgeDrawableId = context.getResources().getIdentifier("overscroll_edge", "drawable", "android"); Drawable androidEdge = context.getResources().getDrawable(edgeDrawableId); androidEdge.setColorFilter(brandColor, PorterDuff.Mode.SRC_IN); } catch (Exception ignored) { } } } }