jquintozamora/react-taxonomypicker

export class Utils {
    /*
     * Function to get Site Collection URL
     * Samples:
     *      "https://domain.sharepoint.com/sites/intranet"
     */
    public static getSiteCollectionUrl(): string {
        let baseUrl = window.location.protocol + "//" + window.location.host;
        const pathname = window.location.pathname;
        const siteCollectionDetector = "/sites/";
        if (pathname.indexOf(siteCollectionDetector) >= 0) {
            baseUrl += pathname.substring(
                0,
                pathname.indexOf("/", siteCollectionDetector.length)
            );
        }
        return baseUrl;
    }

    /*
     * Function to get Current Site Url
     * Samples:
     *      "https://domain.sharepoint.com/sites/intranet/subsite/Pages/Home.aspx"
     */
    public static getCurrentAbsoluteSiteUrl(): string {
        if (
            window &&
            window.hasOwnProperty("location") &&
            window.location.hasOwnProperty("protocol") &&
            window.location.hasOwnProperty("host") &&
            window.location.hasOwnProperty("pathname")
        ) {
            return (
                window.location.protocol +
                "//" +
                window.location.host +
                window.location.pathname
            );
        }
        return null;
    }

    /*
     * Function to get Current Site Url
     * Samples:
     *      "/sites/intranet"
     */
    public static getWebServerRelativeUrl(): string {
        if (
            window &&
            window.hasOwnProperty("location") &&
            window.location.hasOwnProperty("pathname")
        ) {
            return window.location.pathname.replace(/\/$/, "");
        }
        return null;
    }

    /*
     * Function to get Layout Page Url
     * Replacement in SPFx for SP.Utilities.Utility.getLayoutsPageUrl('sp.js')
     * Samples:
     *      getLayoutsPageUrl('sp.js')
     *      "/sites/intranet/_layouts/15/sp.js"
     */
    public static getLayoutsPageUrl(libraryName: string): string {
        if (
            window &&
            window.hasOwnProperty("location") &&
            window.location.hasOwnProperty("pathname") &&
            libraryName !== ""
        ) {
            if (window.location.pathname.indexOf(".aspx") > -1) {
                return window.location.pathname
                    .split("/")
                    .slice(0, -1)
                    .join("/")
                    .concat("/_layouts/15/", libraryName);
            }
            return (
                window.location.pathname.replace(/\/$/, "") +
                "/_layouts/15/" +
                libraryName
            );
        }
        return null;
    }

    /*
     * Function to get Current Domain Url
     * Samples:
     *      "https://domain.sharepoint.com"
     */
    public static getAbsoluteDomainUrl(): string {
        if (
            window &&
            window.hasOwnProperty("location") &&
            window.location.hasOwnProperty("protocol") &&
            window.location.hasOwnProperty("host")
        ) {
            return window.location.protocol + "//" + window.location.host;
        }
        return null;
    }
}