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-rw-r--r--src/de/blinkt/openvpn/FileProvider.java129
1 files changed, 129 insertions, 0 deletions
diff --git a/src/de/blinkt/openvpn/FileProvider.java b/src/de/blinkt/openvpn/FileProvider.java
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+++ b/src/de/blinkt/openvpn/FileProvider.java
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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.ContentValues;
+import android.content.ContentProvider.PipeDataWriter;
+import android.content.res.AssetFileDescriptor;
+import android.database.Cursor;
+import android.net.Uri;
+import android.os.Bundle;
+import android.os.ParcelFileDescriptor;
+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) {
+ // Don't support queries.
+ 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 {
+ // 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-.]*$"))
+ throw new FileNotFoundException("url not in expect format " + uri);
+
+ try {
+
+ File cachedir = getContext().getCacheDir();
+ File dumpfile = new File(cachedir,path);
+ 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;
+ }
+ }
+
+ @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) {
+ }
+ }
+ }
+}