<?php 

function sign_message($data) {
    $timestamp = time();
    $nonce = generate_random_string(64); // 生成一个六位随机数，包含大小写字母和数字
    $message = "$timestamp|$nonce|" . json_encode($data);
    $key = 'qZ6v1&H#Wjx+yRm2D@*sJF$tnfL83Ia';
    $signature = hash_hmac('sha256', $message, $key);
    $signed_message = array(
        'TaskData' => $data,
        'signature' => array(
            'signature' => $signature,
            'timestamp' => $timestamp,
            'nonce' => $nonce
        )
    );
    return json_encode($signed_message);
}

function generate_random_string($length) {
    $characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!@#$%&*()_-+=';
    $random_string = '';
    for ($i = 0; $i < $length; $i++) {
        $index = mt_rand(0, strlen($characters) - 1);
        $random_string .= $characters[$index];
    }
    return $random_string;
}

$data = array(
    "command" => "lastCall",
    "excluded_filename" => "lastCall.txt",
    "batch_filename" => "Communication_definition_SMS_1_wemedia_20230303185518.txt",
    "data_filename" => "Communication_targets_SMS_1_wemedia_20230303185518.txt"
);

echo sign_message($data);