Chronicle Test Client

client.php

<?php
namespace ChronicleClient;

use GuzzleHttp\Client;
use ParagonIE\Chronicle\Chronicle;
use ParagonIE\ConstantTime\Base64UrlSafe;
use ParagonIE\Sapient\Adapter\Guzzle;
use ParagonIE\Sapient\CryptographyKeys\{
    SigningPublicKey,
    SigningSecretKey
};
use ParagonIE\Sapient\Sapient;

require_once 'vendor/autoload.php';

$chronicle = \json_decode(\file_get_contents('server.json'), true);

$file = 'message.txt';
$contents = \file_get_contents($file);
if (empty($contents)) {
    exit(255);
}

$http = new Client();
$sapient = new Sapient(new Guzzle($http));

$request = $sapient->createSignedRequest(
    'POST',
    $chronicle['url'] . '/chronicle/publish',
    $contents,
    new SigningSecretKey(
        Base64UrlSafe::decode($chronicle['my-secret-key'])
    )
)->withAddedHeader(
    'Chronicle-Client-Key-ID',
    $chronicle['client-id']
);
$response = $http->send($request);

$decoded = $sapient->decodeSignedJsonResponse(
    $response,
    new SigningPublicKey(
        Base64UrlSafe::decode($chronicle['chronicle-public-key'])
    )
);
var_dump($decoded);

composer.json

{
    "require": {
        "paragonie/sapient": "^1.0",
        "guzzlehttp/guzzle": "^6"
    }
}

server.json

{
    "url": "https://chronicle-public-test.paragonie.com",
    "client-id": "",
    "my-secret-key": "",
    "my-public-key": "",
    "chronicle-public-key": "3BK4hOYTWJbLV5QdqS-DFKEYOMKd-G5M9BvfbqG1ICI="
}