com.sap.cloud.mt.subscription.UiUrlCreator Maven / Gradle / Ivy

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/******************************************************************************
 * © 2020 SAP SE or an SAP affiliate company. All rights reserved.            *
 ******************************************************************************/
package com.sap.cloud.mt.subscription;

import com.sap.cloud.mt.subscription.exceptions.InternalError;

import java.net.MalformedURLException;
import java.net.URL;

public class UiUrlCreator {
    private UiUrlCreator() {
    }

    public static String createUrl(String subDomain, String baseUiUrl, String urlSeparator) throws InternalError {
        if (subDomain == null || subDomain.trim().isEmpty()) {
            throw new InternalError("No subdomain specified");
        }
        boolean isBaseUiUrl = false;
        boolean isUrlSeparator = false;
        if (!(baseUiUrl == null) && !baseUiUrl.trim().isEmpty()) isBaseUiUrl = true;
        if (!(urlSeparator == null) && !urlSeparator.trim().isEmpty()) isUrlSeparator = true;
        // at least one set, but not all three
        if (!(isBaseUiUrl && isUrlSeparator)
                && (isBaseUiUrl || isUrlSeparator)) {
            throw new InternalError("You have specified one of the URL parameters baseUiUrl and urlSeparator, but not all of them.");
        }
        // all not set
        if (!(isBaseUiUrl || isUrlSeparator)) return "";
        // all set
        try {
            return new URL("https://" + subDomain + urlSeparator + strippedBaseUiUrl(baseUiUrl)).toExternalForm();
        } catch (MalformedURLException e) {
            throw new InternalError(e);
        }
    }

    //if the base url starts with a protocol (for example https://) extract the domain name
    private static String strippedBaseUiUrl(String urlStr) {
        URL url = null;
        try {
            url = new URL(urlStr);
        } catch (MalformedURLException e) {
            return urlStr;
        }
        return url.getHost();
    }
}