IMplement CryptoInputParcelCacheService

1 files changed, 246 insertions, 0 deletions

diff --git a/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java
new file mode 100644
index 000000000..e3e39417a
--- /dev/null
+++ b/OpenKeychain/src/main/java/org/sufficientlysecure/keychain/remote/CryptoInputParcelCacheService.java
@@ -0,0 +1,246 @@
+/*
+ * Copyright (C) 2015 Dominik Schürmann <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.remote;
+
+import android.app.Service;
+import android.content.Context;
+import android.content.Intent;
+import android.os.Binder;
+import android.os.Bundle;
+import android.os.Handler;
+import android.os.HandlerThread;
+import android.os.IBinder;
+import android.os.Message;
+import android.os.Messenger;
+import android.os.RemoteException;
+
+import org.openintents.openpgp.util.OpenPgpApi;
+import org.sufficientlysecure.keychain.Constants;
+import org.sufficientlysecure.keychain.service.input.CryptoInputParcel;
+import org.sufficientlysecure.keychain.util.Log;
+
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+
+public class CryptoInputParcelCacheService extends Service {
+
+    public static final String ACTION_ADD = Constants.INTENT_PREFIX + "ADD";
+    public static final String ACTION_GET = Constants.INTENT_PREFIX + "GET";
+
+    public static final String EXTRA_CRYPTO_INPUT_PARCEL = "crypto_input_parcel";
+    public static final String EXTRA_UUID1 = "uuid1";
+    public static final String EXTRA_UUID2 = "uuid2";
+    public static final String EXTRA_MESSENGER = "messenger";
+
+    private static final int MSG_GET_OKAY = 1;
+    private static final int MSG_GET_NOT_FOUND = 2;
+
+    Context mContext;
+
+    private static final UUID NULL_UUID = new UUID(0, 0);
+
+    private ConcurrentHashMap<UUID, CryptoInputParcel> mCache = new ConcurrentHashMap<>();
+
+    public static class InputParcelNotFound extends Exception {
+        public InputParcelNotFound() {
+        }
+
+        public InputParcelNotFound(String name) {
+            super(name);
+        }
+    }
+
+    public static void addCryptoInputParcel(Context context, Intent data, CryptoInputParcel inputParcel) {
+        UUID mTicket = addCryptoInputParcel(context, inputParcel);
+        // And write out the UUID most and least significant bits.
+        data.putExtra(OpenPgpApi.EXTRA_CALL_UUID1, mTicket.getMostSignificantBits());
+        data.putExtra(OpenPgpApi.EXTRA_CALL_UUID2, mTicket.getLeastSignificantBits());
+    }
+
+    public static CryptoInputParcel getCryptoInputParcel(Context context, Intent data) {
+        if (!data.getExtras().containsKey(OpenPgpApi.EXTRA_CALL_UUID1)
+                || !data.getExtras().containsKey(OpenPgpApi.EXTRA_CALL_UUID2)) {
+            return null;
+        }
+        long mostSig = data.getLongExtra(OpenPgpApi.EXTRA_CALL_UUID1, 0);
+        long leastSig = data.getLongExtra(OpenPgpApi.EXTRA_CALL_UUID2, 0);
+        UUID uuid = new UUID(mostSig, leastSig);
+        try {
+            return getCryptoInputParcel(context, uuid);
+        } catch (InputParcelNotFound inputParcelNotFound) {
+            return null;
+        }
+    }
+
+    private static UUID addCryptoInputParcel(Context context, CryptoInputParcel inputParcel) {
+        UUID uuid = UUID.randomUUID();
+
+        Intent intent = new Intent(context, CryptoInputParcelCacheService.class);
+        intent.setAction(ACTION_ADD);
+        intent.putExtra(EXTRA_CRYPTO_INPUT_PARCEL, inputParcel);
+        intent.putExtra(EXTRA_UUID1, uuid.getMostSignificantBits());
+        intent.putExtra(EXTRA_UUID2, uuid.getLeastSignificantBits());
+        context.startService(intent);
+        return uuid;
+    }
+
+    private static CryptoInputParcel getCryptoInputParcel(Context context, UUID uuid) throws InputParcelNotFound {
+        Intent intent = new Intent(context, CryptoInputParcelCacheService.class);
+        intent.setAction(ACTION_GET);
+
+        final Object mutex = new Object();
+        final Message returnMessage = Message.obtain();
+
+        HandlerThread handlerThread = new HandlerThread("getParcelableThread");
+        handlerThread.start();
+        Handler returnHandler = new Handler(handlerThread.getLooper()) {
+            @Override
+            public void handleMessage(Message message) {
+                // copy over result to handle after mutex.wait
+                returnMessage.what = message.what;
+                returnMessage.copyFrom(message);
+                synchronized (mutex) {
+                    mutex.notify();
+                }
+                // quit handlerThread
+                getLooper().quit();
+            }
+        };
+
+        // Create a new Messenger for the communication back
+        Messenger messenger = new Messenger(returnHandler);
+        intent.putExtra(EXTRA_UUID1, uuid.getMostSignificantBits());
+        intent.putExtra(EXTRA_UUID2, uuid.getLeastSignificantBits());
+        intent.putExtra(EXTRA_MESSENGER, messenger);
+        // send intent to this service
+        context.startService(intent);
+
+        // Wait on mutex until parcelable is returned to handlerThread. Note that this local
+        // variable is used in the handler closure above, so it does make sense here!
+        // noinspection SynchronizationOnLocalVariableOrMethodParameter
+        synchronized (mutex) {
+            try {
+                mutex.wait(3000);
+            } catch (InterruptedException e) {
+                // don't care
+            }
+        }
+
+        switch (returnMessage.what) {
+            case MSG_GET_OKAY:
+                Bundle returnData = returnMessage.getData();
+                returnData.setClassLoader(context.getClassLoader());
+                return returnData.getParcelable(EXTRA_CRYPTO_INPUT_PARCEL);
+            case MSG_GET_NOT_FOUND:
+                throw new InputParcelNotFound();
+            default:
+                Log.e(Constants.TAG, "timeout!");
+                throw new InputParcelNotFound("should not happen!");
+        }
+    }
+
+    /**
+     * Executed when service is started by intent
+     */
+    @Override
+    public int onStartCommand(Intent intent, int flags, int startId) {
+
+        if (intent == null || intent.getAction() == null) {
+            return START_NOT_STICKY;
+        }
+
+        String action = intent.getAction();
+        switch (action) {
+            case ACTION_ADD: {
+                long uuid1 = intent.getLongExtra(EXTRA_UUID1, 0);
+                long uuid2 = intent.getLongExtra(EXTRA_UUID2, 0);
+                UUID uuid = new UUID(uuid1, uuid2);
+                CryptoInputParcel inputParcel = intent.getParcelableExtra(EXTRA_CRYPTO_INPUT_PARCEL);
+                mCache.put(uuid, inputParcel);
+
+                break;
+            }
+            case ACTION_GET: {
+                long uuid1 = intent.getLongExtra(EXTRA_UUID1, 0);
+                long uuid2 = intent.getLongExtra(EXTRA_UUID2, 0);
+                UUID uuid = new UUID(uuid1, uuid2);
+                Messenger messenger = intent.getParcelableExtra(EXTRA_MESSENGER);
+
+                Message msg = Message.obtain();
+                // UUID.equals isn't well documented; we use compareTo instead.
+                if (NULL_UUID.compareTo(uuid) == 0) {
+                    msg.what = MSG_GET_NOT_FOUND;
+                } else {
+                    CryptoInputParcel inputParcel = mCache.get(uuid);
+                    mCache.remove(uuid);
+                    msg.what = MSG_GET_OKAY;
+                    Bundle bundle = new Bundle();
+                    bundle.putParcelable(EXTRA_CRYPTO_INPUT_PARCEL, inputParcel);
+                    msg.setData(bundle);
+                }
+
+                try {
+                    messenger.send(msg);
+                } catch (RemoteException e) {
+                    Log.e(Constants.TAG, "CryptoInputParcelCacheService: Sending message failed", e);
+                }
+                break;
+            }
+            default: {
+                Log.e(Constants.TAG, "CryptoInputParcelCacheService: Intent or Intent Action not supported!");
+                break;
+            }
+        }
+
+        if (mCache.size() <= 0) {
+            // stop whole service if cache is empty
+            Log.d(Constants.TAG, "CryptoInputParcelCacheService: No passphrases remaining in memory, stopping service!");
+            stopSelf();
+        }
+
+        return START_NOT_STICKY;
+    }
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        mContext = this;
+        Log.d(Constants.TAG, "CryptoInputParcelCacheService, onCreate()");
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        Log.d(Constants.TAG, "CryptoInputParcelCacheService, onDestroy()");
+    }
+
+    @Override
+    public IBinder onBind(Intent intent) {
+        return mBinder;
+    }
+
+    public class CryptoInputParcelCacheServiceBinder extends Binder {
+        public CryptoInputParcelCacheService getService() {
+            return CryptoInputParcelCacheService.this;
+        }
+    }
+
+    private final IBinder mBinder = new CryptoInputParcelCacheServiceBinder();
+
+}
\ No newline at end of file