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VCert is a Java library, SDK, designed to simplify key generation and enrollment of machine identities (also known as SSL/TLS certificates and keys) that comply with enterprise security policy by using the Venafi Platform or Venafi Cloud.

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package com.venafi.vcert.sdk.utils;

import java.net.Inet4Address;
import java.net.UnknownHostException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;

import com.venafi.vcert.sdk.certificate.CertificateRequest;
import com.venafi.vcert.sdk.connectors.tpp.AbstractTppConnector.CertificateRequestsPayload;
import com.venafi.vcert.sdk.connectors.tpp.AbstractTppConnector.NameValuePair;
import com.venafi.vcert.sdk.connectors.cloud.CloudConnector.ApiClientInformation;
import com.venafi.vcert.sdk.connectors.tpp.CustomFieldRequest;

public class VCertUtils {

	public static void addExpirationDateAttribute( CertificateRequest request, CertificateRequestsPayload payload ) {

		if ( request.validityHours() > 0 ) {

			Instant now = Instant.now();
			LocalDateTime utcTime = LocalDateTime.ofInstant(now, ZoneOffset.UTC);

			int validityDays = getValidityDays(request.validityHours());

			utcTime = utcTime.plusDays( validityDays );
			String expirationDate = DateTimeFormatter.ofPattern( "yyyy-MM-dd HH:mm:ss" ).format( utcTime );

			// determine issuer hint.

			String issuerHint = "";
			String expirationDateAttribute = "";

			if ( request.issuerHint() != null) {

				issuerHint = String.valueOf( request.issuerHint().charAt(0) );
				issuerHint = issuerHint.toUpperCase();

			}

			switch ( issuerHint ) {

			case "M":
				expirationDateAttribute = "Microsoft CA:Specific End Date";
				break;

			case "D":
				expirationDateAttribute = "DigiCert CA:Specific End Date";
				break;

			case "E":
				expirationDateAttribute = "EntrustNET CA:Specific End Date";
				break;

			default:
				expirationDateAttribute = "Specific End Date";
				break;
			}

			payload.caSpecificAttributes()
			.add( new NameValuePair(expirationDateAttribute, expirationDate) );
		}

	}

	public static int getValidityDays( int validityHours ) {

		int validityDays = validityHours / 24;

		//If dividing the hours to convert them to days have fractional numbers then round it
		//to the next day.
		if ( validityHours % 24 > 0 ) {

			validityDays = validityDays + 1;

		}

		return validityDays;
	}
	
	public static void addCustomFieldsToRequest( CertificateRequest request, CertificateRequestsPayload payload ) {
		if( request.customFields() != null && request.customFields().size() > 0 ) {

			if( payload.customFields() == null ) {
				
				payload.customFields( new ArrayList<>() );
				
			}

			request.customFields().forEach( cf ->{

				String currentFieldName = cf.name();

				CustomFieldRequest customFieldRequest = payload.customFields().stream()
						.filter( e -> e.name().equals( currentFieldName ) )
						.findFirst().orElse( null );

				if( customFieldRequest == null ) {

					CustomFieldRequest newCustomFieldRequest =  new CustomFieldRequest();
					newCustomFieldRequest.name(currentFieldName);
					
					List values = new ArrayList();
					values.add( cf.value() );
					newCustomFieldRequest.values( values );

					payload.customFields().add( newCustomFieldRequest );


				}else {

					customFieldRequest.values().add( cf.value() );

				}
			});
		}
	}
	
	public static String getIpAddress() throws UnknownHostException {
		
		return  Inet4Address.getLocalHost().getHostAddress();
		
	}

	public static void addApiClientInformation(com.venafi.vcert.sdk.connectors.cloud.CloudConnector.CertificateRequestsPayload payload ) {
		//add client information
		ApiClientInformation clientInfo = new ApiClientInformation();
		clientInfo.type(VCertConstants.DEFAULT_VENDOR_AND_PRODUCT_NAME );

		try {
			clientInfo.identifier(VCertUtils.getIpAddress());
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}

		payload.apiClientInformation(clientInfo);
	}

}