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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
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<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) {
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) {
}
}
}
}
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