package at.gv.egovernment.moa.id.proxy.builder;

import java.text.MessageFormat;
import java.util.Calendar;

import org.w3c.dom.Element;

import at.gv.egovernment.moa.id.BuildException;
import at.gv.egovernment.moa.util.Constants;
import at.gv.egovernment.moa.util.DOMUtils;
import at.gv.egovernment.moa.util.DateTimeUtils;

/**
 * Builder for the <code>&lt;samlp:Request&gt;</code> used for querying
 * the authentication data <code>&lt;saml:Assertion&gt;</code>.
 * 
 * @author Paul Ivancsics
 * @version $Id$
 */
public class SAMLRequestBuilder implements Constants {
  /** samlp-Request template */
	private static final String REQUEST =
  	"<samlp:Request xmlns:samlp=\"urn:oasis:names:tc:SAML:1.0:protocol\" RequestID=\"{0}\" MajorVersion=\"1\" MinorVersion=\"0\" IssueInstant=\"{1}\">" +
  	"<samlp:AssertionArtifact>{2}</samlp:AssertionArtifact>" +  
		"</samlp:Request>";

  /**
   * Constructor for SAMLRequestBuilder.
   */
  public SAMLRequestBuilder() {
    super();
  }
  
  /**
   * Builds the <code>&lt;samlp:Request&gt;</code>.
   * @param requestID request ID
   * @param samlArtifactBase64 SAML artifact, encoded BASE64
   * @return the DOM element
   */
  public Element build(String requestID, String samlArtifactBase64) throws BuildException {
  	try {
  		String issueInstant = DateTimeUtils.buildDateTime(Calendar.getInstance());
  		String request = MessageFormat.format(REQUEST, new Object[] {requestID, issueInstant, samlArtifactBase64});
  		Element requestElem = DOMUtils.parseDocument(request, false, ALL_SCHEMA_LOCATIONS, null).getDocumentElement();
	  	return requestElem;
  	}
  	catch (Throwable ex) {
			throw new BuildException(
				"builder.00", 
				new Object[] {"samlp:Request", ex.toString()}, 
				ex);
		}
  }

}