parse music files

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/MusicFilesActivity.java

@@ -16,26 +16,30 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>. */
 package nodomain.freeyourgadget.gadgetbridge.activities;
 
-import android.app.Activity;
+import android.content.res.AssetFileDescriptor;
-import android.content.Intent;
+import android.media.MediaMetadataRetriever;
 import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.MenuItem;
 
-import androidx.activity.result.ActivityResult;
-import androidx.activity.result.ActivityResultCallback;
 import androidx.activity.result.ActivityResultLauncher;
 import androidx.activity.result.contract.ActivityResultContracts;
 
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 
+import org.json.JSONException;
+import org.json.JSONObject;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.util.List;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.io.InputStream;
 
 import nodomain.freeyourgadget.gadgetbridge.R;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
+import nodomain.freeyourgadget.gadgetbridge.util.FileUtils;
 
 public class MusicFilesActivity extends AbstractGBActivity {
     private static final Logger LOG = LoggerFactory.getLogger(MusicFilesActivity.class);
@@ -50,15 +54,53 @@ public class MusicFilesActivity extends AbstractGBActivity {
 
         final ActivityResultLauncher<String> activityResultLauncher = this.registerForActivityResult(
                 new ActivityResultContracts.GetMultipleContents(),
-                urilist -> LOG.info("got {}", urilist)
+                urilist -> {
+                    final MediaMetadataRetriever mediaMetadataRetriever = new MediaMetadataRetriever();
+
+                    LOG.info("Got {}", urilist);
+
+                    for (final Uri uri : urilist) {
+                        mediaMetadataRetriever.setDataSource(MusicFilesActivity.this, uri);
+
+                        final String title = mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_TITLE);
+                        final String artist = mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST);
+                        final String album = mediaMetadataRetriever.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM);
+
+                        long fileSize;
+                        try (AssetFileDescriptor fileDescriptor = getApplicationContext().getContentResolver().openAssetFileDescriptor(uri , "r")){
+                            fileSize = fileDescriptor.getLength();
+                        } catch (IOException e) {
+                            throw new RuntimeException(e);
+                        }
+
+                        final JSONObject jsonObject = new JSONObject();
+                        try {
+                            jsonObject.put("title", title);
+                            jsonObject.put("album", album);
+                            jsonObject.put("artist", artist);
+                            jsonObject.put("size", fileSize);
+                        } catch (final JSONException e) {
+                            throw new RuntimeException(e);
+                        }
+
+                        final String md5;
+                        try (InputStream inputStream = getContentResolver().openInputStream(uri)) {
+                            md5 = FileUtils.md5sum(inputStream);
+                        } catch (final IOException e) {
+                            throw new RuntimeException(e);
+                        }
+
+                        LOG.info("{}: {} {}", uri, md5, jsonObject);
+                    }
+
+                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
+                        mediaMetadataRetriever.close();
+                    }
+                }
         );
 
         final FloatingActionButton fab = findViewById(R.id.fab);
         fab.setOnClickListener(v -> {
-            final Intent intent = new Intent();
-            intent.setType("audio/*");
-            intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
-            intent.setAction(Intent.ACTION_GET_CONTENT);
             activityResultLauncher.launch("audio/*");
         });
     }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/FileUtils.java

@@ -21,6 +21,7 @@ import android.content.ContentResolver;
 import android.content.Context;
 import android.net.Uri;
 import android.os.Environment;
+import android.util.Log;
 
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
@@ -34,12 +35,20 @@ import java.io.IOException;
 import java.io.InputStream;
 import java.io.InputStreamReader;
 import java.io.OutputStream;
+import java.math.BigInteger;
 import java.nio.channels.FileChannel;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Locale;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.GBEnvironment;
 
@@ -349,4 +358,27 @@ public class FileUtils {
         }
         return extension;
     }
-}
+
+    @Nullable
+    public static String md5sum(final InputStream is) {
+        MessageDigest digest;
+        try {
+            digest = MessageDigest.getInstance("MD5");
+        } catch (final NoSuchAlgorithmException e) {
+            Log.e(TAG, "Failed to get MD5 digest instance", e);
+            return null;
+        }
+
+        try {
+            final byte[] buffer = new byte[8192];
+            int read;
+            while ((read = is.read(buffer)) > 0) {
+                digest.update(buffer, 0, read);
+            }
+            return String.format("%1$32s", GB.hexdump(digest.digest())).replace(' ', '0').toLowerCase(Locale.ROOT);
+        } catch (final IOException e) {
+            Log.e(TAG, "Error reading file", e);
+            return null;
+        }
+    }
+}