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 fromConfig
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 hook
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8.12
1<?php
2
3declare(strict_types=1);
4
5namespace Cosray;
6
7use Celema\Quma\Database;
8use Closure;
9use Cosray\Exception\RuntimeException;
10use Cosray\Webhooks\Delivery;
11
12/**
13 * Tells other systems that content changed, such as a static site build or a
14 * cache in front of the API. Each event queues one delivery job per hook,
15 * which retries a failed POST. The jobs are pushed inside the write's
16 * transaction, so they exist only if the write commits, whether it happens
17 * in a request, a job or a command.
18 *
19 *     'webhooks' => [
20 *         ['url' => 'https://build.example.com/hook', 'secret' => $secret, 'events' => ['node.*']],
21 *     ],
22 *
23 * Events are `node.created`, `node.updated` (a live write, publishing and
24 * unpublishing included), `node.draft` (a working copy saved or dropped) and
25 * `node.deleted`. The body holds `id`, `event`, `at` and the node's `uid` and
26 * `type`; with a secret, `X-Cosray-Signature` carries `sha256=` and the
27 * HMAC-SHA256 of the body.
28 */
29final class Webhooks
30{
31    public const string USER_AGENT = 'cosray-webhooks';
32
33    /** @var list<array{url: string, secret: ?string, events: list<string>}> */
34    private readonly array $hooks;
35
36    /**
37     * @param list<array{url: string, secret?: ?string, events?: list<string>}> $hooks
38     * @param Closure(array{url: string, headers: array<string, string>, body: string}): void $queue
39     *        queues the delivery of one request
40     */
41    public function __construct(
42        array $hooks,
43        private readonly Closure $queue,
44    ) {
45        $this->hooks = array_map(self::hook(...), $hooks);
46    }
47
48    public static function fromConfig(Config $config, Database $db): self
49    {
50        $hooks = $config->get('webhooks', []);
51
52        if (!is_array($hooks) || !array_is_list($hooks)) {
53            throw new RuntimeException('`webhooks` takes a list of hooks.');
54        }
55
56        $queue = new Queue($db);
57
58        /** @var list<array{url: string, secret?: ?string, events?: list<string>}> $hooks */
59        return new self(
60            $hooks,
61            static function (array $request) use ($queue): void {
62                $queue->push(Delivery::class, $request, queue: 'webhooks');
63            },
64        );
65    }
66
67    /**
68     * Queues the deliveries of an event on the write's connection.
69     *
70     * @param array<string, mixed> $data
71     */
72    public function record(string $event, array $data): void
73    {
74        $id = bin2hex(random_bytes(16));
75        $body = null;
76
77        foreach ($this->hooks as $hook) {
78            if (!self::subscribes($hook['events'], $event)) {
79                continue;
80            }
81
82            $body ??= json_encode(
83                ['id' => $id, 'event' => $event, 'at' => gmdate('Y-m-d\TH:i:s\Z'), ...$data],
84                JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR,
85            );
86            $headers = [
87                'Content-Type' => 'application/json',
88                'User-Agent' => self::USER_AGENT,
89                'X-Cosray-Event' => $event,
90                'X-Cosray-Delivery' => $id,
91            ];
92
93            if ($hook['secret'] !== null) {
94                $headers['X-Cosray-Signature'] = 'sha256=' . hash_hmac('sha256', $body, $hook['secret']);
95            }
96
97            ($this->queue)(['url' => $hook['url'], 'headers' => $headers, 'body' => $body]);
98        }
99    }
100
101    /** @param list<string> $patterns */
102    private static function subscribes(array $patterns, string $event): bool
103    {
104        foreach ($patterns as $pattern) {
105            if (
106                $pattern === '*'
107                || $pattern === $event
108                || str_ends_with($pattern, '.*')
109                && str_starts_with($event, substr($pattern, 0, -1))
110            ) {
111                return true;
112            }
113        }
114
115        return false;
116    }
117
118    /** @return array{url: string, secret: ?string, events: list<string>} */
119    private static function hook(mixed $hook): array
120    {
121        $url = is_array($hook) ? $hook['url'] ?? null : null;
122
123        if (!is_string($url) || preg_match('#^https?://#i', $url) !== 1) {
124            throw new RuntimeException('A webhook needs an http or https `url`.');
125        }
126
127        $secret = $hook['secret'] ?? null;
128        $events = $hook['events'] ?? ['*'];
129
130        if ($secret !== null && !is_string($secret) || !is_array($events) || !array_is_list($events)) {
131            throw new RuntimeException("The webhook for {$url} takes a string `secret` and a list of `events`.");
132        }
133
134        return ['url' => $url, 'secret' => $secret, 'events' => array_values(array_filter($events, is_string(...)))];
135    }
136}