/*
* Copyright 2003 Federal Chancellery Austria
*
* 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 at.gv.egovernment.moa.id.auth.builder;

import java.io.IOException;
import java.text.MessageFormat;

import at.gv.egovernment.moa.id.BuildException;
import at.gv.egovernment.moa.util.Constants;
import at.gv.egovernment.moa.util.FileUtils;

/**
 * Builder for the <code>&lt;VerifyXMLSignatureRequest&gt;</code> structure
 * used for presenting certificate information in the secure viewer of the security layer implementation.
 * 
 * @author Paul Ivancsics
 * @version $Id$
 */
public class CertInfoVerifyXMLSignatureRequestBuilder extends Builder implements Constants {
  
  /** special tag in the VerifyXMLRequest template to be substituted for a <code>&lt;dsig:Signature&gt;</code> */
  private static final String SIGNATURE_TAG = "<dsig:Signature/>";
  
  /** private static String nl contains the NewLine representation in Java*/
  private static final String nl = "\n";

  /**
   * XML template for the CertInfoVerifyXMLSignatureRequest to be built
   */ 
  static final String CERTINFO_REQUEST =
    "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" + nl +                                                                  
    "<{0}:VerifyXMLSignatureRequest {2} xmlns:dsig=\"" + DSIG_NS_URI +  "\">" + nl +
    "  <{0}:SignatureInfo>" + nl +
    "    <{0}:SignatureEnvironment>" + nl +
    "      <{1}:XMLContent xml:space=\"preserve\"><dsig:Signature/></{1}:XMLContent>" + nl +
    "    </{0}:SignatureEnvironment>" + nl +
    "    <{0}:SignatureLocation>//dsig:Signature</{0}:SignatureLocation>" + nl +
    "  </{0}:SignatureInfo>" + nl +
    "</{0}:VerifyXMLSignatureRequest>";

  /**
   * Constructor
   */
  public CertInfoVerifyXMLSignatureRequestBuilder() {
    super();
  }
  /**
   * Builds the <code>&lt;VerifyXMLSignatureRequest&gt;</code> structure.
   * @return the XML structure
   * @throws BuildException
   */
  public String build(boolean slVersion12) throws BuildException {
    
    String sl10Prefix;
    String sl11Prefix;
    String slNsDeclaration;
        
    if (slVersion12) {
            
      sl10Prefix = SL12_PREFIX;
      sl11Prefix = SL12_PREFIX;
      slNsDeclaration = "xmlns:" + SL12_PREFIX + "=\"" + SL12_NS_URI + "\"";
      
    } else {
      
      sl10Prefix = SL10_PREFIX;
      sl11Prefix = SL11_PREFIX;
      slNsDeclaration = "xmlns:" + sl11Prefix + "=\"" + SL11_NS_URI + "\" xmlns:" + sl10Prefix + "=\"" + SL10_NS_URI + "\"";
      
    }
    
    String certInfoRequest = MessageFormat.format(CERTINFO_REQUEST, new Object[] {sl11Prefix, sl10Prefix, slNsDeclaration});
    String resDsigSignature = "resources/xmldata/CertInfoDsigSignature.xml";
    
    
    try {
      String dsigSignature = FileUtils.readResource(resDsigSignature, "UTF-8");
      certInfoRequest = replaceTag(certInfoRequest, SIGNATURE_TAG, dsigSignature, true, 1);
      return certInfoRequest;
    }
    catch (IOException ex) {
      throw new BuildException("auth.04", new Object[] {resDsigSignature, ex.toString()});
    }
  }

}