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    @mutation@("execute@grpc_rpcname@")
    public ListenableFuture<@grpc_resname@> @grpc_rpcname@(
            DataFetchingEnvironment environment,
            @grpc_reqname@ req) {

        boolean isVerified = @grpc_rpcname@OAuth(environment, req.getRequestHeaders());
        if  ( isVerified ) return futureClient.execute@grpc_rpcname@(req);
        else {
            SettableFuture<@grpc_resname@> errFuture = SettableFuture.create();
            errFuture.set(@[email protected]().setStatus(getErrorStatus(errMsg)).build());
            return errFuture;
        }
    }

    protected boolean @grpc_rpcname@OAuth(DataFetchingEnvironment environment, RequestHeaders reqHeaders) {


        OAuthValidator.VerifyInput authAndAppToken = getVerifyInput(environment, reqHeaders);
        boolean checkPrivate = @oauth_private@;
        boolean isVerified = ! checkPrivate;
        if ( checkPrivate ) {
            OAuthValidator.Claim[] claims = new OAuthValidator.Claim[] {
                @oauth_claims@
            };
            try {
                String preferredUserName =  ( claims.length > 0  ) ?
                    OAuthValidator.getInstance().verify(authAndAppToken, claims) :
                    OAuthValidator.getInstance().verify(authAndAppToken);

                isVerified = ( preferredUserName.equals(reqHeaders.getPrefferedUserName()));
            } catch (Exception ex) { isVerified = false; errMsg = ex.getMessage();}
        }
        return isVerified;
    }