1 files changed, 140 insertions, 0 deletions
diff --git a/app/src/main/java/de/blinkt/openvpn/FileProvider.java b/app/src/main/java/de/blinkt/openvpn/FileProvider.java
new file mode 100644
index 00000000..9ffd6545
--- /dev/null
+++ b/app/src/main/java/de/blinkt/openvpn/FileProvider.java
@@ -0,0 +1,140 @@
+package de.blinkt.openvpn;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+import android.content.ContentProvider;
+import android.content.ContentProvider.PipeDataWriter;
+import android.content.ContentValues;
+import android.content.res.AssetFileDescriptor;
+import android.database.Cursor;
+import android.database.MatrixCursor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+import android.provider.OpenableColumns;
+import android.util.Log;
+import de.blinkt.openvpn.core.VpnStatus;
+
+/**
+ * A very simple content provider that can serve arbitrary asset files from
+ * our .apk.
+ */
+public class FileProvider extends ContentProvider
+implements PipeDataWriter<InputStream> {
+	@Override
+	public boolean onCreate() {
+		return true;
+	}
+
+	@Override
+	public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
+			String sortOrder) {
+		try {
+			File dumpfile = getFileFromURI(uri);
+
+
+			MatrixCursor c = new MatrixCursor(projection);
+
+			Object[] row = new Object[projection.length];
+			int i=0;
+			for (String r:projection) {
+				if(r.equals(OpenableColumns.SIZE))
+					row[i] = dumpfile.length();
+				if(r.equals(OpenableColumns.DISPLAY_NAME))
+					row[i] = dumpfile.getName();
+				i++;
+			}
+			c.addRow(row);
+			return c;
+		} catch (FileNotFoundException e) {
+            VpnStatus.logException(e);
+            return null;
+		}
+
+
+	}
+
+	@Override
+	public Uri insert(Uri uri, ContentValues values) {
+		// Don't support inserts.
+		return null;
+	}
+
+	@Override
+	public int delete(Uri uri, String selection, String[] selectionArgs) {
+		// Don't support deletes.
+		return 0;
+	}
+
+	@Override
+	public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
+		// Don't support updates.
+		return 0;
+	}
+
+	@Override
+	public String getType(Uri uri) {
+		// For this sample, assume all files are .apks.
+		return "application/octet-stream";
+	}
+
+	@Override
+	public AssetFileDescriptor openAssetFile(Uri uri, String mode) throws FileNotFoundException {
+		File dumpfile = getFileFromURI(uri);
+
+		try {
+
+			InputStream is = new FileInputStream(dumpfile);
+			// Start a new thread that pipes the stream data back to the caller.
+			return new AssetFileDescriptor(
+					openPipeHelper(uri, null, null, is, this), 0,
+					dumpfile.length());
+		} catch (IOException e) {
+            throw new FileNotFoundException("Unable to open minidump " + uri);
+		}
+	}
+
+	private File getFileFromURI(Uri uri) throws FileNotFoundException {
+		// Try to open an asset with the given name.
+		String path = uri.getPath();
+		if(path.startsWith("/"))
+			path = path.replaceFirst("/", "");       
+
+		// I think this already random enough, no need for magic secure cookies
+		// 1f9563a4-a1f5-2165-255f2219-111823ef.dmp
+		if (!path.matches("^[0-9a-z-.]*(dmp|dmp.log)$"))
+			throw new FileNotFoundException("url not in expect format " + uri);
+		File cachedir = getContext().getCacheDir();
+        return new File(cachedir,path);
+	}
+
+	@Override
+	public void writeDataToPipe(ParcelFileDescriptor output, Uri uri, String mimeType,
+			Bundle opts, InputStream args) {
+		// Transfer data from the asset to the pipe the client is reading.
+		byte[] buffer = new byte[8192];
+		int n;
+		FileOutputStream fout = new FileOutputStream(output.getFileDescriptor());
+		try {
+			while ((n=args.read(buffer)) >= 0) {
+				fout.write(buffer, 0, n);
+			}
+		} catch (IOException e) {
+			Log.i("OpenVPNFileProvider", "Failed transferring", e);
+		} finally {
+			try {
+				args.close();
+			} catch (IOException e) {
+			}
+			try {
+				fout.close();
+			} catch (IOException e) {
+			}
+		}
+	}
+}