refactor direct capture

Closes #3516
// FREEBIE

src/org/thoughtcrime/securesms/providers/CaptureProvider.java

@@ -0,0 +1,62 @@
+package org.thoughtcrime.securesms.providers;
+
+import android.content.ContentUris;
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.Bitmap.CompressFormat;
+import android.net.Uri;
+
+import org.thoughtcrime.securesms.crypto.DecryptingPartInputStream;
+import org.thoughtcrime.securesms.crypto.EncryptingPartOutputStream;
+import org.thoughtcrime.securesms.crypto.MasterSecret;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class CaptureProvider {
+  private static final String TAG           = CaptureProvider.class.getSimpleName();
+  private static final String URI_STRING    = "content://org.thoughtcrime.securesms/capture";
+  public  static final Uri    CONTENT_URI   = Uri.parse(URI_STRING);
+  public  static final String AUTHORITY     = "org.thoughtcrime.securesms";
+  public  static final String EXPECTED_PATH = "capture/#";
+
+  private static volatile CaptureProvider instance;
+  public static CaptureProvider getInstance(Context context) {
+    if (instance == null) {
+      synchronized (CaptureProvider.class) {
+        if (instance == null) {
+          instance = new CaptureProvider(context);
+        }
+      }
+    }
+    return instance;
+  }
+
+  private final Context context;
+
+  private CaptureProvider(Context context) {
+    this.context = context.getApplicationContext();
+  }
+
+  public Uri create(MasterSecret masterSecret, Bitmap bitmap) throws IOException {
+    long         id     = System.currentTimeMillis();
+    OutputStream output = new EncryptingPartOutputStream(getFile(id), masterSecret);
+    bitmap.compress(CompressFormat.JPEG, 100, output);
+    output.close();
+    return ContentUris.withAppendedId(CONTENT_URI, id);
+  }
+
+  public boolean delete(Uri uri) {
+    return getFile(ContentUris.parseId(uri)).delete();
+  }
+
+  public InputStream getStream(MasterSecret masterSecret, long id) throws IOException {
+    return new DecryptingPartInputStream(getFile(id), masterSecret);
+  }
+
+  private File getFile(long id) {
+    return new File(context.getDir("captures", Context.MODE_PRIVATE), id + ".capture");
+  }
+}