<?php

function _syslog($msg) {
    $trace = debug_backtrace();
    $caller = $trace[1];
    $parent = $caller['function'];
    if (isset($caller['class']))
        $parent = $caller['class'] . '::' . $parent;

    return error_log( "{$parent}: {$msg}" );
}

$raw = file_get_contents("php://input");
try {
  $payload = json_decode($raw, TRUE);
} catch (Exception $e) {
    header('HTTP/1.1 422 Unprocessable Entity');
    _syslog('[webhook] json_decode failed on:' . $raw);
    die('Unprocessable Entity');
}

if(! isset($payload['secret']) || $payload['secret'] != '{{ callback_secret }}' ) {
    header('HTTP/1.1 400 Bad Request');
    _syslog('[webhook] bad request:' . $raw);
    die('Bad Request');
}

$msg = sprintf('
Type: %s
Source: %s
Target: %s
From: %s

%s
',
$payload['post']['wm-property'],
$payload['source'],
$payload['target'],
$payload['post']['author']['name'],
$payload['post']['content']['text']
);


mail("{{ author.email }}", "[webmention] {$payload['source']}", $msg);
header('HTTP/1.1 202 Accepted');