com.sap.cloud.yaas.servicesdk.apiconsole.utils.ExternalUrlHeaderUtil Maven / Gradle / Ivy

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/*
 * © 2016 SAP SE or an SAP affiliate company.
 * All rights reserved.
 * Please see http://www.sap.com/corporate-en/legal/copyright/index.epx for additional trademark information and
 * notices.
 */
package com.sap.cloud.yaas.servicesdk.apiconsole.utils;

import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;


/**
 * Used to calculate the external base path based on the values of headers.
 * The external base path is built using the values of the hyrbis-external-url
 * headers. If any of these values are null/empty the external base path cannot be calculated and the result will be
 * null.
 * 
 * @deprecated Has been moved to {@link com.sap.cloud.yaas.servicesdk.ramlrewriter.filter.ExternalUrlHeaderUtil}
 */
@Deprecated
public final class ExternalUrlHeaderUtil
{
	/** Header name use for passing the external url. */
	public static final String HYBRIS_EXTERNAL_URL = "hybris-external-url";
	private static final Logger LOG = LoggerFactory.getLogger(ExternalUrlHeaderUtil.class);

	private ExternalUrlHeaderUtil()
	{
		//
	}

	private static boolean isBlank(final String text)
	{
		return text == null || "".equals(text.trim());
	}

	/**
	 * Flag informing that the provided header parameters are correct through the proxy external call. Which means :
	 * 
	 * contains the {@value ExternalUrlHeaderUtil#HYBRIS_EXTERNAL_URL}
	 * 
	 * .
	 *
	 * @param externalUrlHeader the given headers
	 * @return a flag
	 */
	public static boolean isExternal(final String externalUrlHeader)
	{
		if (isBlank(externalUrlHeader))
		{
			return false;
		}

		return assureIsInternal(externalUrlHeader);
	}

	private static boolean assureIsInternal(final String externalUrlHeader)
	{
		try
		{
			new URL(externalUrlHeader).toURI();
			return true;
		}
		catch (final MalformedURLException | URISyntaxException e)
		{
			LOG.warn(HYBRIS_EXTERNAL_URL + " header contains invalid url '" + externalUrlHeader + "'", e);
			return false;
		}
	}

	/**
	 * Returns the external base uri calculated from given header if possible. If any external header value
	 * is null, or corrupted, the method returns null (external path cannot be calculated).
	 *
	 * See more {@link #isExternal(String)}.
	 *
	 * @param externalUrlHeader the given header value
	 * @return an external base uri for headers if possible
	 */
	public static URI asExternalUri(final String externalUrlHeader)
	{
		if (isExternal(externalUrlHeader))
		{
			try
			{
				return new URL(externalUrlHeader).toURI();
			}
			catch (final MalformedURLException | URISyntaxException e)
			{
				LOG.warn(HYBRIS_EXTERNAL_URL + " header contains invalid url '" + externalUrlHeader + "'", e);
			}
		}
		return null;
	}
}