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<?php
declare(strict_types=1);
namespace Kreait\Firebase\Messaging;
use Kreait\Firebase\Exception\InvalidArgumentException;
final class MessageData implements \JsonSerializable
{
/** @var array<string, string> */
private $data = [];
private function __construct()
{
}
/**
* @param array<mixed, mixed> $data
*/
public static function fromArray(array $data): self
{
$messageData = new self();
foreach ($data as $key => $value) {
if (!self::isStringable($key) || !self::isStringable($value)) {
throw new InvalidArgumentException('Message data must be a one-dimensional array of string(able) keys and values.');
}
if (self::isBinary((string) $value)) {
throw new InvalidArgumentException(
"The message data field '{$key}' seems to contain binary data. As this can lead to broken messages, "
.'please convert it to a string representation first, e.g. with bin2hex() or base64encode().'
);
}
self::assertValidKey((string) $key);
$messageData->data[(string) $key] = (string) $value;
}
return $messageData;
}
/**
* @return array<string, string>
*/
public function jsonSerialize(): array
{
return $this->data;
}
/**
* @param mixed $value
*/
private static function isStringable($value): bool
{
return \is_null($value) || \is_scalar($value) || (\is_object($value) && \method_exists($value, '__toString'));
}
private static function isBinary(string $value): bool
{
return \mb_detect_encoding($value) === false;
}
/**
* @see https://firebase.google.com/docs/cloud-messaging/concept-options#data_messages
*/
private static function assertValidKey(string $value): void
{
$value = \mb_strtolower($value);
// According to the docs, "notification" is reserved, but it's still accepted ¯\_(ツ)_/¯
$reservedWords = ['from', /*'notification',*/ 'message_type'];
$reservedPrefixes = ['google', 'gcm'];
if (\in_array($value, $reservedWords, true)) {
throw new InvalidArgumentException("'{$value}' is a reserved word and can not be used as a key in FCM data payloads");
}
foreach ($reservedPrefixes as $prefix) {
if (\mb_strpos($value, $prefix) === 0) {
throw new InvalidArgumentException("'{$prefix}' is a reserved prefix and can not be used as a key in FCM data payloads");
}
}
}
}
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