content: /*
   * Copyright (c) 2013 3 Round Stones Inc., Some Rights Reserved
   *
   * 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 org.callimachusproject.setup;
  
  import java.io.IOException;
  import java.io.Writer;
  import java.security.SecureRandom;
  import java.util.UUID;
  
  import org.apache.commons.codec.binary.Base64;
  import org.callimachusproject.engine.model.TermFactory;
  import org.callimachusproject.repository.CalliRepository;
  import org.openrdf.OpenRDFException;
  import org.openrdf.model.URI;
  import org.openrdf.model.ValueFactory;
  import org.openrdf.model.vocabulary.RDF;
  import org.openrdf.model.vocabulary.RDFS;
  import org.openrdf.repository.RepositoryException;
  import org.openrdf.repository.object.ObjectConnection;
  
  public class SecretOriginProvider extends UpdateProvider {
  	private static final String FOAF_DOC = "http://xmlns.com/foaf/0.1/Document";
  	private static final String CALLI = "http://callimachusproject.org/rdf/2009/framework#";
  	private static final String CALLI_SECRET = CALLI + "secret";
  	private static final String CALLI_HAS_COMPONENT = CALLI + "hasComponent";
  
  	@Override
  	public Updater updateOrigin(final String origin) throws IOException {
  		return new Updater() {
  			public boolean update(String webapp, CalliRepository repository)
  					throws IOException, OpenRDFException {
  				ObjectConnection con = repository.getConnection();
  				try {
  					con.begin();
  					ValueFactory vf = con.getValueFactory();
  					URI subj = vf.createURI(origin + "/");
  					if (!con.hasStatement(subj, vf.createURI(CALLI_SECRET),
  							null)) {
  						URI secret = createSecretFile(webapp, con);
  						Writer writer = con.getBlobObject(secret).openWriter();
  						try {
  							byte[] bytes = new byte[1024];
  							new SecureRandom().nextBytes(bytes);
  							writer.write(Base64.encodeBase64String(bytes));
  						} finally {
  							writer.close();
  						}
  						con.add(subj, vf.createURI(CALLI_SECRET), secret);
  						con.commit();
  						return true;
  					} else {
  						con.commit();
  					}
  					return false;
  				} finally {
  					con.close();
  				}
  			}
  		};
  	}
  
  	public static URI createSecretFile(String webapp, ObjectConnection con)
  			throws RepositoryException {
  		TermFactory tf = TermFactory.newInstance(webapp);
  		String TextFile = tf.resolve("types/TextFile");
  		String secrets = tf.resolve("/auth/secrets/");
  		ValueFactory vf = con.getValueFactory();
  		String label = UUID.randomUUID().toString();
  		URI secret = vf.createURI(secrets + label);
  		con.add(secret, RDF.TYPE, vf.createURI(TextFile));
  		con.add(secret, RDF.TYPE, vf.createURI(FOAF_DOC));
  		con.add(secret, RDFS.LABEL, vf.createLiteral(label.replace('-', ' ')));
  		con.add(vf.createURI(secrets), vf.createURI(CALLI_HAS_COMPONENT), secret);
  		return secret;
  	}
  
  }
  