/*

 * Copyright (C) 2010 The IDEAL Group

 *

 * 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.ideal.webaccess;



import java.io.File;

import java.io.FileNotFoundException;



import android.content.ContentProvider;

import android.content.ContentValues;

import android.database.Cursor;

import android.net.Uri;

import android.os.Environment;

import android.os.ParcelFileDescriptor;



/**

 * Content Provider for serving JavaScript. JavaScript files must be stored

 * under: /sdcard/ideal-webaccess/js/ for example:

 * /sdcard/ideal-webaccess/js/MY_JS_FILE.js JavaScript files can be accessed by

 * in the WebView by using: content://com.ideal.webaccess.localjs/MY_JS_FILE.js

 */

public class LocalJsProvider extends ContentProvider {

    private static final String URI_PREFIX = "content://com.ideal.webaccess.localjs";



    public static String constructUri(String url) {

        Uri uri = Uri.parse(url);

        return uri.isAbsolute() ? url : URI_PREFIX + url;

    }



    @Override

    public ParcelFileDescriptor openFile(Uri uri, String mode) throws FileNotFoundException {

        String filename = uri.toString();

        if (filename.length() > URI_PREFIX.length()) {

            filename = filename.substring(URI_PREFIX.length() + 1);

            if ((filename.indexOf("//") != -1) || (filename.indexOf("..") != -1)) {

                return null;

            }

            filename = Environment.getExternalStorageDirectory() + "/ideal-webaccess/js/"

                    + filename;



            File file = new File(filename);

            ParcelFileDescriptor parcel = ParcelFileDescriptor.open(file,

                    ParcelFileDescriptor.MODE_READ_ONLY);

            return parcel;

        }

        return null;

    }



    @Override

    public boolean onCreate() {

        return true;

    }



    @Override

    public int delete(Uri uri, String s, String[] as) {

        throw new UnsupportedOperationException("Not supported by this provider");

    }



    @Override

    public String getType(Uri uri) {

        throw new UnsupportedOperationException("Not supported by this provider");

    }



    @Override

    public Uri insert(Uri uri, ContentValues contentvalues) {

        throw new UnsupportedOperationException("Not supported by this provider");

    }



    @Override

    public Cursor query(Uri uri, String[] as, String s, String[] as1, String s1) {

        throw new UnsupportedOperationException("Not supported by this provider");

    }



    @Override

    public int update(Uri uri, ContentValues contentvalues, String s, String[] as) {

        throw new UnsupportedOperationException("Not supported by this provider");

    }



}