CookieUtils.ts

CookieUtils.ts

// Code originally taken from : https://developers.livechatinc.com/blog/setting-cookies-to-subdomains-in-javascript/
export class Cookie {
  private static prefix: string = "coveo_";

  static set(name: string, value: string, expiration?: number) {
    const host = this.getHostname();
    if (host.split(".").length === 1) {
      // no '.' in a domain - it's localhost or something similar
      document.cookie = this.buildCookie(name, value, expiration);
    } else {
      // Remember the cookie on all subdomains.
      //
      // Start with trying to set cookie to the top domain.
      // (example: if user is on foo.com, try to set
      //  cookie to domain '.com')
      //
      // If the cookie will not be set, it means '.com'
      // is a top level domain and we need to
      // set the cookie to '.foo.com'
      const domainParts = host.split(".");
      domainParts.shift();
      let domain = "." + domainParts.join(".");

      document.cookie = this.buildCookie(name, value, expiration, domain);

      // check if cookie was successfuly set to the given domain
      // (otherwise it was a Top-Level Domain)
      if (Cookie.get(name) == null || Cookie.get(name) != value) {
        // append '.' to current domain
        domain = "." + host;
        document.cookie = this.buildCookie(name, value, expiration, domain);
      }
    }
  }

  private static getHostname() {
    return location.hostname;
  }

  private static buildCookie(
    name: string,
    value: string,
    expiration?: number,
    domain?: string
  ) {
    const expires = expiration ? this.buildExpiresValue(expiration) : "";
    const domainCookie = domain ? `; domain=${domain}` : "";
    return `${this.prefix}${name}=${value}${expires}${domainCookie}; SameSite=Lax; path=/`;
  }

  private static buildExpiresValue(expiration: number) {
    return `; expires=${new Date(Date.now() + expiration).toUTCString()}`;
  }

  static get(name: string) {
    const nameEQ = `${this.prefix}${name}=`;
    const ca = document.cookie.split(";");
    for (let i = 0; i < ca.length; i++) {
      let c = ca[i];
      while (c.charAt(0) === " ") {
        c = c.substring(1, c.length);
      }

      if (c.indexOf(nameEQ) == 0) {
        return c.substring(nameEQ.length, c.length);
      }
    }
    return null;
  }

  static erase(name: string) {
    Cookie.set(name, "", -1);
  }
}