ASPC.Marvel.CrimeAPI.SharePointAcsContextProvider.ValidateSharePointContext C# (CSharp) Method

        protected override bool ValidateSharePointContext(SharePointContext spContext, HttpContextBase httpContext)
        {
            SharePointAcsContext spAcsContext = spContext as SharePointAcsContext;

            if (spAcsContext != null)
            {
                Uri spHostUrl = SharePointContext.GetSPHostUrl(httpContext.Request);
                string contextToken = TokenHelper.GetContextTokenFromRequest(httpContext.Request);
                HttpCookie spCacheKeyCookie = httpContext.Request.Cookies[SPCacheKeyKey];
                string spCacheKey = spCacheKeyCookie != null ? spCacheKeyCookie.Value : null;

                return spHostUrl == spAcsContext.SPHostUrl &&
                       !string.IsNullOrEmpty(spAcsContext.CacheKey) &&
                       spCacheKey == spAcsContext.CacheKey &&
                       !string.IsNullOrEmpty(spAcsContext.ContextToken) &&
                       (string.IsNullOrEmpty(contextToken) || contextToken == spAcsContext.ContextToken);
            }

            return false;
        }