/*******************************************************************************
 * Copyright 2014 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 * 
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 * 
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 ******************************************************************************/
/*
 * Copyright 2003 Federal Chancellery Austria
 * MOA-ID has been developed in a cooperation between BRZ, the Federal
 * Chancellery Austria - ICT staff unit, and Graz University of Technology.
 *
 * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
 * the European Commission - subsequent versions of the EUPL (the "Licence");
 * You may not use this work except in compliance with the Licence.
 * You may obtain a copy of the Licence at:
 * http://www.osor.eu/eupl/
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the Licence is distributed on an "AS IS" basis,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Licence for the specific language governing permissions and
 * limitations under the Licence.
 *
 * This product combines work with different licenses. See the "NOTICE" text
 * file for details on the various modules and licenses.
 * The "NOTICE" text file is part of the distribution. Any derivative works
 * that you distribute must include a readable copy of the "NOTICE" text file.
 */


package at.gv.egiz.eaaf.core.impl.utils;

import org.apache.commons.lang3.StringUtils;

import at.gv.egiz.eaaf.core.api.data.EAAFConstants;

/**
 * Builds a DataURL parameter meant for the security layer implementation
 * to respond to.
 * 
 * @author Paul Ivancsics
 * @version $Id$
 */
public class DataURLBuilder {
	
  /**
   * Constructor for DataURLBuilder.
   */
  public DataURLBuilder() {
    super();
  }

  /**
   * Constructs a data URL for <code>VerifyIdentityLink</code> or <code>VerifyAuthenticationBlock</code>, 
   * including the <code>MOASessionID</code> as a parameter.
   * 
   * @param authBaseURL base URL (context path) of the MOA ID Authentication component,
   * 				 including a trailing <code>'/'</code>
   * @param authServletName request part of the data URL
   * @param pendingReqId sessionID to be included in the dataURL
   * @return String
   */
  public String buildDataURL(String authBaseURL, String authServletName, String pendingReqId) {
		String dataURL;		
		if (!authBaseURL.endsWith("/"))
			authBaseURL += "/";
		
		if (authServletName.startsWith("/"))
			authServletName = authServletName.substring(1);
		
		dataURL = authBaseURL + authServletName;

		if (StringUtils.isNotEmpty(pendingReqId))
			dataURL = addParameter(dataURL, EAAFConstants.PARAM_HTTP_TARGET_PENDINGREQUESTID, pendingReqId);
		
  	return dataURL;
  }

  /**
   * Method addParameter.
   * @param urlString represents the url 
   * @param paramname is the parameter to be added
   * @param value is the value of that parameter
   * @return String
   */
  private String addParameter(String urlString, String paramname, String value) {
    String url = urlString;
    if (paramname != null) {
      if (url.indexOf("?") < 0)
        url += "?";
      else
        url += "&";
      url += paramname + "=" + value;
    }
    return url;
  }
}