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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC licenses this file
// to you 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 org.openqa.selenium.server;

import org.openqa.jetty.util.IO;
import org.openqa.jetty.util.URLResource;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;

/**
 * Represents a sessioned extension Javascript resource. This class provides just enough canned
 * return values for the purpose of being passed into ResourceHandler.sendData(), and is not
 * guaranteed to hold water for anything else!
 */
class SessionExtensionJsResource extends URLResource {
  private String extensionJs;

  public SessionExtensionJsResource(String extensionJs)
      throws MalformedURLException {
    super(new URL("http://seleniumhq.org"), null);
    this.extensionJs = extensionJs;
  }

  @Override
  public boolean exists() {
    return true;
  }

  @Override
  public boolean isDirectory() {
    return false;
  }

  /**
   * Returns the lastModified time, which is always in the distant future to prevent caching. This
   * comes from FutureFileResource originally.
   */
  @Override
  public long lastModified() {
    return System.currentTimeMillis() + (1000L * 3600L * 24L * 365L * 12L);
  }

  @Override
  public long length() {
    return extensionJs.length();
  }

  /**
   * This is basically a copy of Resource.writeTo() .
   */
  @Override
  public void writeTo(OutputStream out, long start, long count)
      throws IOException {
    // TODO(flight): I think this is equivalent.
    // The original code used a StringInputStream from Ant

    InputStream in = new ByteArrayInputStream(extensionJs.getBytes());

    try {
      in.skip(start);
      if (count < 0)
        IO.copy(in, out);
      else
        IO.copy(in, out, (int) count);
    } finally {
      in.close();
    }
  }
}