package org.springframework.security.oauth.examples.tonr.impl;
   
   import java.io.ByteArrayInputStream;
   import java.io.IOException;
   import java.io.InputStream;
   import java.net.URI;
   import java.util.ArrayList;
   import java.util.List;
   
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.parsers.SAXParser;
  import javax.xml.parsers.SAXParserFactory;
  
  import org.springframework.security.oauth.consumer.client.OAuthRestTemplate;
  import org.springframework.security.oauth.examples.tonr.GoogleService;
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  import org.xml.sax.helpers.DefaultHandler;
  
  /**
   * @author Ryan Heaton
   */
  public class GoogleServiceImpl implements GoogleService {
  
    private OAuthRestTemplate googleRestTemplate;
  
    public List<String> getLastTenPicasaPictureURLs() {
  //    byte[] bytes = getGoogleRestTemplate().getForObject(URI.create("https://picasaweb.google.com/data/feed/api/user/default"), byte[].class);
      byte[] bytes = getGoogleRestTemplate().getForObject(URI.create("https://picasaweb.google.com/data/feed/api/user/default?kind=photo&max-results=10"), byte[].class);
      InputStream photosXML = new ByteArrayInputStream(bytes);
      final List<String> photoUrls = new ArrayList<String>();
      SAXParserFactory parserFactory = SAXParserFactory.newInstance();
      parserFactory.setValidating(false);
      parserFactory.setXIncludeAware(false);
      parserFactory.setNamespaceAware(true);
      try {
        SAXParser parser = parserFactory.newSAXParser();
        parser.parse(photosXML, new DefaultHandler() {
          @Override
          public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException {
            if ("http://search.yahoo.com/mrss/".equals(uri)
              && "thumbnail".equalsIgnoreCase(localName)) {
              int width = 0;
              try {
                width = Integer.parseInt(attributes.getValue("width"));
                if (width > 100 && width < 200) {
                  //just do the thumbnails that are between 100 and 200 px...
                  photoUrls.add(attributes.getValue("url"));
                }
              }
              catch (NumberFormatException e) {
                //fall through...
              }
            }
          }
        });
        return photoUrls;
      }
      catch (ParserConfigurationException e) {
        throw new IllegalStateException(e);
      }
      catch (SAXException e) {
        throw new IllegalStateException(e);
      }
      catch (IOException e) {
        throw new IllegalStateException(e);
      }
    }
  
    public OAuthRestTemplate getGoogleRestTemplate() {
      return googleRestTemplate;
    }
  
    public void setGoogleRestTemplate(OAuthRestTemplate googleRestTemplate) {
      this.googleRestTemplate = googleRestTemplate;
    }
  }