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<?php |
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namespace ExoUNX\Vasri; |
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use Exception; |
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/** |
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* Builds resources for the access class |
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* Class Builder |
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* |
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* @package ExoUNX\Vasri |
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* @author Gaige Lama <[email protected]> |
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* @license MIT License |
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* @link https://github.com/ExoUNX/Vasri |
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*/ |
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class Builder |
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{ |
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/** |
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* SHA256 Hash Algorithm |
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*/ |
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private const SHA256 = 'sha256'; |
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/** |
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* SHA384 Hash Algorithm |
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*/ |
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private const SHA384 = 'sha384'; |
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/** |
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* SHA512 Hash Algorithm |
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*/ |
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private const SHA512 = 'sha512'; |
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/** |
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* Builder constructor. |
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*/ |
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public function __construct() |
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{ |
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//TODO Set config options here |
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} |
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/** |
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* Constructs a valid SRI string |
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* |
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* @param string $file |
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* |
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* |
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* @return string |
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* @throws Exception |
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*/ |
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public function sri(string $file) |
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{ |
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$algorithm = self::selectAlgorithm(); |
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return $algorithm.'-'.base64_encode( |
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hash_file($algorithm, $file, true) |
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); |
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} |
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/** |
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* Constructs a query string containing the md5 hash of the input file |
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* |
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* @param string $file |
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* |
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* @return string |
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*/ |
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public function versioning(string $file) |
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{ |
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return '?id='.hash_file('md5', $file); |
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} |
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/** |
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* Sets the HTML attribute based on the file extension and throws an exception if invalid |
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* |
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* @param string $path |
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* |
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* @return string |
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* @throws Exception |
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*/ |
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public function attribute(string $path): string |
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{ |
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$extension = self::parseExtension($path); |
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switch ($extension) { |
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case 'css': |
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$attribute = 'href'; |
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break; |
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case 'js': |
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$attribute = 'src'; |
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break; |
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default: |
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throw new Exception('Invalid or Unsupported Extension'); |
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} |
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return $attribute; |
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} |
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/** |
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* Checks config for hash algorithm and if nothing is found default to SHA384 |
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* |
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* @return string |
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* @throws Exception |
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*/ |
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private static function selectAlgorithm(): string |
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{ |
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if ( ! empty(config('vasri.hash-algorithm'))) { |
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$algorithm = config('vasri.hash-algorithm'); |
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if ($algorithm !== self::SHA256 |
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&& $algorithm !== self::SHA384 |
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&& $algorithm !== self::SHA512 |
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) { |
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throw new Exception('Invalid or Unsupported Hash Algorithm'); |
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} |
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} else { |
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$algorithm = self::SHA384; |
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} |
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return $algorithm; |
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} |
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/** |
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* Removes everything but the short extension |
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* |
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* @param string $path |
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* |
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* @return string |
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*/ |
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private static function parseExtension(string $path): string |
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{ |
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return preg_replace("#\?.*#", "", pathinfo($path, PATHINFO_EXTENSION)); |
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} |
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} |
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ExoUNX /
Vasri
