ProviderHostedCustomUIActionsWeb.TokenHelper.CreateRemoteEventReceiverClientContext C# (CSharp) Method

        public static ClientContext CreateRemoteEventReceiverClientContext(SPRemoteEventProperties properties)
        {
            Uri sharepointUrl;
            if (properties.ListEventProperties != null)
            {
                sharepointUrl = new Uri(properties.ListEventProperties.WebUrl);
            }
            else if (properties.ItemEventProperties != null)
            {
                sharepointUrl = new Uri(properties.ItemEventProperties.WebUrl);
            }
            else if (properties.WebEventProperties != null)
            {
                sharepointUrl = new Uri(properties.WebEventProperties.FullUrl);
            }
            else
            {
                return null;
            }

            if (IsHighTrustApp())
            {
                return GetS2SClientContextWithWindowsIdentity(sharepointUrl, null);
            }

            return CreateAcsClientContextForUrl(properties, sharepointUrl);
        }