package eu.siacs.conversations.services; import android.content.ComponentName; import android.content.ContentProvider; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.content.ServiceConnection; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.Color; import android.net.Uri; import android.os.CancellationSignal; import android.os.IBinder; import android.os.ParcelFileDescriptor; import android.support.annotation.Nullable; import android.support.v4.content.ContextCompat; import android.util.Log; import com.google.zxing.BarcodeFormat; import com.google.zxing.EncodeHintType; import com.google.zxing.common.BitMatrix; import com.google.zxing.qrcode.QRCodeWriter; import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.OutputStream; import java.util.Hashtable; import eu.siacs.conversations.Config; import eu.siacs.conversations.entities.Account; import eu.siacs.conversations.utils.CryptoHelper; import rocks.xmpp.addr.Jid; public class BarcodeProvider extends ContentProvider implements ServiceConnection { private static final String AUTHORITY = ".barcodes"; private final Object lock = new Object(); private XmppConnectionService mXmppConnectionService; private boolean mBindingInProcess = false; public static Uri getUriForAccount(Context context, Account account) { final String packageId = context.getPackageName(); return Uri.parse("content://" + packageId + AUTHORITY + "/" + account.getJid().asBareJid() + ".png"); } public static Bitmap create2dBarcodeBitmap(String input, int size) { try { final QRCodeWriter barcodeWriter = new QRCodeWriter(); final Hashtable hints = new Hashtable<>(); hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.M); hints.put(EncodeHintType.CHARACTER_SET, "UTF-8"); final BitMatrix result = barcodeWriter.encode(input, BarcodeFormat.QR_CODE, size, size, hints); final int width = result.getWidth(); final int height = result.getHeight(); final int[] pixels = new int[width * height]; for (int y = 0; y < height; y++) { final int offset = y * width; for (int x = 0; x < width; x++) { pixels[offset + x] = result.get(x, y) ? Color.BLACK : Color.WHITE; } } final Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, width, 0, 0, width, height); return bitmap; } catch (final Exception e) { e.printStackTrace(); return null; } } @Override public boolean onCreate() { File barcodeDirectory = new File(getContext().getCacheDir().getAbsolutePath() + "/barcodes/"); if (barcodeDirectory.exists() && barcodeDirectory.isDirectory()) { for (File file : barcodeDirectory.listFiles()) { if (file.isFile() && !file.isHidden()) { if (file.delete()) { Log.d(Config.LOGTAG, "deleted old barcode file " + file.getAbsolutePath()); } } } } return true; } @Nullable @Override public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) { return null; } @Nullable @Override public String getType(Uri uri) { return "image/png"; } @Nullable @Override public Uri insert(Uri uri, ContentValues values) { return null; } @Override public int delete(Uri uri, String selection, String[] selectionArgs) { return 0; } @Override public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) { return 0; } @Override public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException { return openFile(uri, mode, null); } @Override public ParcelFileDescriptor openFile(Uri uri, String mode, CancellationSignal signal) throws FileNotFoundException { Log.d(Config.LOGTAG, "opening file with uri (normal): " + uri.toString()); String path = uri.getPath(); if (path != null && path.endsWith(".png") && path.length() >= 5) { String jid = path.substring(1).substring(0, path.length() - 4); Log.d(Config.LOGTAG, "account:" + jid); if (connectAndWait()) { Log.d(Config.LOGTAG, "connected to background service"); try { Account account = mXmppConnectionService.findAccountByJid(Jid.of(jid)); if (account != null) { String shareableUri = account.getShareableUri(); String hash = CryptoHelper.getFingerprint(shareableUri); File file = new File(getContext().getCacheDir().getAbsolutePath() + "/barcodes/" + hash); if (!file.exists()) { file.getParentFile().mkdirs(); file.createNewFile(); Bitmap bitmap = create2dBarcodeBitmap(account.getShareableUri(), 1024); OutputStream outputStream = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.PNG, 100, outputStream); outputStream.close(); outputStream.flush(); } return ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY); } } catch (Exception e) { throw new FileNotFoundException(); } } } throw new FileNotFoundException(); } private boolean connectAndWait() { Intent intent = new Intent(getContext(), XmppConnectionService.class); intent.setAction(this.getClass().getSimpleName()); Context context = getContext(); if (context != null) { synchronized (this) { if (mXmppConnectionService == null && !mBindingInProcess) { Log.d(Config.LOGTAG, "calling to bind service"); context.bindService(intent, this, Context.BIND_AUTO_CREATE); this.mBindingInProcess = true; } } try { waitForService(); return true; } catch (InterruptedException e) { return false; } } else { Log.d(Config.LOGTAG, "context was null"); return false; } } @Override public void onServiceConnected(ComponentName name, IBinder service) { synchronized (this) { XmppConnectionService.XmppConnectionBinder binder = (XmppConnectionService.XmppConnectionBinder) service; mXmppConnectionService = binder.getService(); mBindingInProcess = false; synchronized (this.lock) { lock.notifyAll(); } } } @Override public void onServiceDisconnected(ComponentName name) { synchronized (this) { mXmppConnectionService = null; } } private void waitForService() throws InterruptedException { if (mXmppConnectionService == null) { synchronized (this.lock) { lock.wait(); } } else { Log.d(Config.LOGTAG, "not waiting for service because already initialized"); } } }