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/**
* Copyright (C) 2008 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 com.android.htmlviewer;
import java.io.FileNotFoundException;
import java.io.File;
import java.lang.UnsupportedOperationException;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Binder;
import android.os.ParcelFileDescriptor;
import android.os.Process;
/**
* WebView does not support file: loading. This class wraps a file load
* with a content provider.
* As HTMLViewer does not have internet access nor does it allow
* Javascript to be run, it is safe to load file based HTML content.
*/
public class FileContentProvider extends ContentProvider {
public static final String BASE_URI =
"content://com.android.htmlfileprovider";
@Override
public String getType(Uri uri) {
// If the mimetype is not appended to the uri, then return an empty string
String mimetype = uri.getQuery();
return mimetype == null ? "" : mimetype;
}
@Override
public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {
// android:exported="false" is broken in older releases so we have to
// manually enforce the calling identity.
if (Process.myUid() != Binder.getCallingUid()) {
throw new SecurityException("Permission denied");
}
if (!"r".equals(mode)) {
throw new FileNotFoundException("Bad mode for " + uri + ": " + mode);
}
String filename = uri.getPath();
File f = new File(filename);
if (f.isDirectory()) {
return null;
}
return ParcelFileDescriptor.open(f, ParcelFileDescriptor.MODE_READ_ONLY);
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
throw new UnsupportedOperationException();
}
@Override
public Uri insert(Uri uri, ContentValues values) {
throw new UnsupportedOperationException();
}
@Override
public boolean onCreate() {
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
throw new UnsupportedOperationException();
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
throw new UnsupportedOperationException();
}
}
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