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/live/webhook_inbox.php

<?php
declare(strict_types=1);
require __DIR__ . '/bootstrap.php';

$stream = preg_replace('/[^a-zA-Z0-9_\-]/', '', (string)($_GET['stream'] ?? 'default')) ?: 'default';
$path = SIMON_DATA_DIR . '/webhook_' . $stream . '.ndjson';
$secrets = simon_secrets();
$secret = (string)($secrets['SIMON_WEBHOOK_SECRET'] ?? '');

function simon_check_webhook_secret(string $secret): bool {
    if ($secret === '') return true;
    $key = (string)($_GET['key'] ?? '');
    if ($key !== '' && hash_equals($secret, $key)) return true;
    $body = file_get_contents('php://input') ?: '';
    $sig = $_SERVER['HTTP_X_SIGNATURE'] ?? $_SERVER['HTTP_X_SIMON_SIGNATURE'] ?? '';
    if ($sig !== '') {
        $expected = hash_hmac('sha256', $body, $secret);
        $sig = preg_replace('/^sha256=/', '', (string)$sig);
        if (hash_equals($expected, $sig)) return true;
    }
    return false;
}

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    if (!simon_check_webhook_secret($secret)) simon_json_response(['ok'=>false,'error'=>'Unauthorized webhook'], 401);
    $raw = file_get_contents('php://input') ?: '';
    $payload = json_decode($raw, true);
    if (!is_array($payload)) $payload = ['title'=>'Webhook Text Event','message'=>$raw];
    $row = [
        'id' => sha1($stream . '|' . microtime(true) . '|' . $raw),
        'stream' => $stream,
        'at' => gmdate('c'),
        'ip' => $_SERVER['REMOTE_ADDR'] ?? '',
        'payload' => $payload,
    ];
    @file_put_contents($path, json_encode($row, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . "\n", FILE_APPEND | LOCK_EX);
    simon_json_response(['ok'=>true,'stored'=>1,'stream'=>$stream,'id'=>$row['id']]);
}

$limit = max(1, min(500, (int)($_GET['limit'] ?? 100)));
$lines = is_file($path) ? (file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: []) : [];
$rows = [];
foreach (array_slice($lines, -$limit) as $line) {
    $row = json_decode($line, true);
    if (is_array($row)) $rows[] = $row;
}
simon_json_response(['ok'=>true,'stream'=>$stream,'count'=>count($rows),'items'=>array_reverse($rows)]);

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