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<?php |
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declare(strict_types=1); |
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namespace Shlinkio\Shlink\Core\Service; |
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use Cake\Chronos\Chronos; |
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use Cocur\Slugify\Slugify; |
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use Cocur\Slugify\SlugifyInterface; |
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use Doctrine\ORM\EntityManagerInterface; |
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use GuzzleHttp\ClientInterface; |
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use GuzzleHttp\Exception\GuzzleException; |
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use Psr\Http\Message\UriInterface; |
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use Shlinkio\Shlink\Core\Entity\ShortUrl; |
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use Shlinkio\Shlink\Core\Exception\EntityDoesNotExistException; |
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use Shlinkio\Shlink\Core\Exception\InvalidShortCodeException; |
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use Shlinkio\Shlink\Core\Exception\InvalidUrlException; |
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use Shlinkio\Shlink\Core\Exception\NonUniqueSlugException; |
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use Shlinkio\Shlink\Core\Exception\RuntimeException; |
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use Shlinkio\Shlink\Core\Model\ShortUrlMeta; |
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use Shlinkio\Shlink\Core\Repository\ShortUrlRepository; |
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use Shlinkio\Shlink\Core\Util\TagManagerTrait; |
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use Throwable; |
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use function floor; |
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use function fmod; |
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use function preg_match; |
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use function strlen; |
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class UrlShortener implements UrlShortenerInterface |
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{ |
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use TagManagerTrait; |
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public const DEFAULT_CHARS = '123456789bcdfghjkmnpqrstvwxyzBCDFGHJKLMNPQRSTVWXYZ'; |
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private const ID_INCREMENT = 200000; |
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/** |
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* @var ClientInterface |
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*/ |
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private $httpClient; |
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/** |
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* @var EntityManagerInterface |
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*/ |
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private $em; |
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/** |
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* @var string |
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*/ |
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private $chars; |
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/** |
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* @var SlugifyInterface |
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*/ |
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private $slugger; |
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/** |
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* @var bool |
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*/ |
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private $urlValidationEnabled; |
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public function __construct( |
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ClientInterface $httpClient, |
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EntityManagerInterface $em, |
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$urlValidationEnabled, |
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$chars = self::DEFAULT_CHARS, |
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SlugifyInterface $slugger = null |
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) { |
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$this->httpClient = $httpClient; |
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$this->em = $em; |
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$this->urlValidationEnabled = (bool) $urlValidationEnabled; |
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$this->chars = empty($chars) ? self::DEFAULT_CHARS : $chars; |
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$this->slugger = $slugger ?: new Slugify(); |
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} |
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/** |
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* @throws NonUniqueSlugException |
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* @throws InvalidUrlException |
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* @throws RuntimeException |
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*/ |
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public function urlToShortCode( |
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UriInterface $url, |
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array $tags = [], |
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?Chronos $validSince = null, |
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?Chronos $validUntil = null, |
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?string $customSlug = null, |
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?int $maxVisits = null |
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): ShortUrl { |
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// If the URL validation is enabled, check that the URL actually exists |
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if ($this->urlValidationEnabled) { |
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$this->checkUrlExists($url); |
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} |
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$customSlug = $this->processCustomSlug($customSlug); |
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// Transactionally insert the short url, then generate the short code and finally update the short code |
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try { |
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$this->em->beginTransaction(); |
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// First, create the short URL with an empty short code |
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$shortUrl = new ShortUrl( |
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(string) $url, |
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ShortUrlMeta::createFromParams($validSince, $validUntil, null, $maxVisits) |
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); |
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$this->em->persist($shortUrl); |
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$this->em->flush(); |
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// Generate the short code and persist it |
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// TODO Somehow provide the logic to calculate the shortCode to avoid the need of a setter |
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$shortCode = $customSlug ?? $this->convertAutoincrementIdToShortCode((float) $shortUrl->getId()); |
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$shortUrl->setShortCode($shortCode) |
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->setTags($this->tagNamesToEntities($this->em, $tags)); |
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$this->em->flush(); |
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$this->em->commit(); |
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return $shortUrl; |
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} catch (Throwable $e) { |
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if ($this->em->getConnection()->isTransactionActive()) { |
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$this->em->rollback(); |
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$this->em->close(); |
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} |
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throw new RuntimeException('An error occurred while persisting the short URL', -1, $e); |
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} |
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} |
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/** |
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* Tries to perform a GET request to provided url, returning true on success and false on failure |
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* |
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* @param UriInterface $url |
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* @return void |
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*/ |
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private function checkUrlExists(UriInterface $url) |
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{ |
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try { |
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$this->httpClient->request('GET', $url, ['allow_redirects' => [ |
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'max' => 15, |
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]]); |
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} catch (GuzzleException $e) { |
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throw InvalidUrlException::fromUrl($url, $e); |
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} |
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} |
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/** |
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* Generates the unique shortcode for an autoincrement ID |
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* |
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* @param float $id |
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* @return string |
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*/ |
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private function convertAutoincrementIdToShortCode(float $id): string |
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{ |
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$id += self::ID_INCREMENT; // Increment the Id so that the generated shortcode is not too short |
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$length = strlen($this->chars); |
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$code = ''; |
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while ($id > 0) { |
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// Determine the value of the next higher character in the short code and prepend it |
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$code = $this->chars[(int) fmod($id, $length)] . $code; |
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$id = floor($id / $length); |
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} |
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return $this->chars[(int) $id] . $code; |
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} |
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private function processCustomSlug($customSlug) |
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{ |
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if ($customSlug === null) { |
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return null; |
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} |
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// If a custom slug was provided, make sure it's unique |
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$customSlug = $this->slugger->slugify($customSlug); |
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$shortUrl = $this->em->getRepository(ShortUrl::class)->findOneBy(['shortCode' => $customSlug]); |
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if ($shortUrl !== null) { |
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throw NonUniqueSlugException::fromSlug($customSlug); |
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} |
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return $customSlug; |
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} |
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/** |
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* Tries to find the mapped URL for provided short code. Returns null if not found |
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* |
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* @throws InvalidShortCodeException |
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* @throws EntityDoesNotExistException |
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*/ |
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public function shortCodeToUrl(string $shortCode): ShortUrl |
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{ |
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// Validate short code format |
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if (! preg_match('|[' . $this->chars . ']+|', $shortCode)) { |
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throw InvalidShortCodeException::fromCharset($shortCode, $this->chars); |
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} |
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/** @var ShortUrlRepository $shortUrlRepo */ |
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$shortUrlRepo = $this->em->getRepository(ShortUrl::class); |
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1 |
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$shortUrl = $shortUrlRepo->findOneByShortCode($shortCode); |
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if ($shortUrl === null) { |
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throw EntityDoesNotExistException::createFromEntityAndConditions(ShortUrl::class, [ |
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'shortCode' => $shortCode, |
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]); |
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} |
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1 |
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return $shortUrl; |
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} |
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} |
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shlinkio /
shlink
