文字列が Amazon S3 のバケット名の命名規則に従っているかを検証する PHP の関数は下記のように記述します。
/**
* Validate bucket name of Amazon S3.
*
* @param string $name
* @return bool
*/
function validate_bucket_name($name) {
// Bucket names must be at least 3 and no more than 63 characters long
$length = strlen($name);
if ($length < 3 || 63 < $length) {
return false;
}
// Bucket names must not be formatted as an IP address (e.g., 192.168.5.4)
$pattern = '/^[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}\\.[0-9]{1,3}$/';
if (preg_match($pattern, $name)) {
return false;
}
// Bucket name must be a series of one or more labels separated by a period (.), where each label:
// - Must start with a lowercase letter or a number
// - Must end with a lowercase letter or a number
// - Can contain lowercase letters, numbers and dashes
$pattern = '/^[0-9a-z]([0-9a-z\\-]*[0-9a-z])?(\\.[0-9a-z]([0-9a-z\\-]*[0-9a-z])?)*$/';
if (!preg_match($pattern, $name)) {
return false;
}
return true;
}
この関数は、下記の PHP スクリプトでテストしました。
function check_bucket_name($name) {
if (validate_bucket_name($name)) {
echo $name . ' is valid!' . "\n";
} else {
echo $name . ' is invalid...' . "\n";
}
}
echo '----- Valid Bucket Name -----' . "\n";
check_bucket_name('myawsbucket');
check_bucket_name('my.aws.bucket');
check_bucket_name('myawsbucket.1');
echo '----- Invalid Bucket Name -----' . "\n";
check_bucket_name('192.168.5.4');
check_bucket_name('.myawsbucket');
check_bucket_name('myawsbucket.');
check_bucket_name('my..examplebucket');
検証結果は下記のとおりです。
$ php test_validate_bucket_name.php ----- Valid Bucket Name ----- myawsbucket is valid! my.aws.bucket is valid! myawsbucket.1 is valid! ----- Invalid Bucket Name ----- 192.168.5.4 is invalid... .myawsbucket is invalid... myawsbucket. is invalid... my..examplebucket is invalid... $
正規表現が怪しいので、間違いがあったら教えてください。
参考文献