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-rw-r--r--src/main/java/eu/siacs/conversations/persistance/FileBackend.java33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
index 21ba4509..69b81569 100644
--- a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
+++ b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
@@ -1,5 +1,7 @@
package eu.siacs.conversations.persistance;
+import android.annotation.TargetApi;
+import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
@@ -9,8 +11,13 @@ import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.RectF;
import android.net.Uri;
+import android.os.Build;
import android.os.Environment;
+import android.os.ParcelFileDescriptor;
import android.provider.OpenableColumns;
+import android.system.ErrnoException;
+import android.system.Os;
+import android.system.StructStat;
import android.util.Base64;
import android.util.Base64OutputStream;
import android.util.Log;
@@ -19,6 +26,7 @@ import android.webkit.MimeTypeMap;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.File;
+import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
@@ -646,4 +654,29 @@ public class FileBackend {
}
}
}
+
+
+ public static boolean weOwnFile(Uri uri) {
+ if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
+ return false;
+ } else {
+ return uri != null
+ && ContentResolver.SCHEME_FILE.equals(uri.getScheme())
+ && weOwnFileLollipop(uri);
+ }
+ }
+
+ @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+ private static boolean weOwnFileLollipop(Uri uri) {
+ try {
+ File file = new File(uri.getPath());
+ FileDescriptor fd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY).getFileDescriptor();
+ StructStat st = Os.fstat(fd);
+ return st.st_uid == android.os.Process.myUid();
+ } catch (ErrnoException e) {
+ return true;
+ } catch (FileNotFoundException e) {
+ return false;
+ }
+ }
}