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; /** * A very simple content provider that can serve arbitrary asset files from * our .apk. */ public class FileProvider extends ContentProvider implements PipeDataWriter { @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) { e.printStackTrace(); 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) { FileNotFoundException fnf = new FileNotFoundException("Unable to open minidump " + uri); throw fnf; } } 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(); File dumpfile = new File(cachedir,path); return dumpfile; } @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) { } } } }