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<?php namespace Stichoza\GoogleTranslate; use ErrorException; use GuzzleHttp\Client; use GuzzleHttp\Exception\RequestException; use Stichoza\GoogleTranslate\Tokens\GoogleTokenGenerator; use Stichoza\GoogleTranslate\Tokens\TokenProviderInterface; use UnexpectedValueException; /** * Free Google Translate API PHP Package. * * @author Levan Velijanashvili <me@stichoza.com> * @link http://stichoza.com/ * @license MIT */ class GoogleTranslate { /** * @var \GuzzleHttp\Client HTTP Client */ protected $client; /** * @var string|null Source language - from where the string should be translated */ protected $source; /** * @var string Target language - to which language string should be translated */ protected $target; /** * @var string|null Last detected source language */ protected $lastDetectedSource; /** * @var string Google Translate URL base */ protected $url = 'https://translate.google.com/translate_a/single'; /** * @var array Dynamic GuzzleHttp client options */ protected $options = []; /** * @var array URL Parameters */ protected $urlParams = [ 'client' => 'gtx', 'hl' => 'en', 'dt' => [ 't', // Translate 'bd', // Full translate with synonym ($bodyArray[1]) 'at', // Other translate ($bodyArray[5] - in google translate page this shows when click on translated word) 'ex', // Example part ($bodyArray[13]) 'ld', // I don't know ($bodyArray[8]) 'md', // Definition part with example ($bodyArray[12]) 'qca', // I don't know ($bodyArray[8]) 'rw', // Read also part ($bodyArray[14]) 'rm', // I don't know 'ss' // Full synonym ($bodyArray[11]) ], 'sl' => null, // Source language 'tl' => null, // Target language 'q' => null, // String to translate 'ie' => 'UTF-8', // Input encoding 'oe' => 'UTF-8', // Output encoding 'multires' => 1, 'otf' => 0, 'pc' => 1, 'trs' => 1, 'ssel' => 0, 'tsel' => 0, 'kc' => 1, 'tk' => null, ]; /** * @var array Regex key-value patterns to replace on response data */ protected $resultRegexes = [ '/,+/' => ',', '/\[,/' => '[', ]; /** * @var TokenProviderInterface Token provider */ protected $tokenProvider; /** * Class constructor. * * For more information about HTTP client configuration options, see "Request Options" in * GuzzleHttp docs: http://docs.guzzlephp.org/en/stable/request-options.html * * @param string $target Target language * @param string|null $source Source language * @param array|null $options Associative array of http client configuration options * @param TokenProviderInterface|null $tokenProvider */ public function __construct(string $target = 'en', string $source = null, array $options = null, TokenProviderInterface $tokenProvider = null) { $this->client = new Client(); $this->setTokenProvider($tokenProvider ?? new GoogleTokenGenerator) ->setOptions($options) // Options are already set in client constructor tho. ->setSource($source) ->setTarget($target); } /** * Set target language for translation. * * @param string $target Language code * @return GoogleTranslate */ public function setTarget(string $target): self { $this->target = $target; return $this; } /** * Set source language for translation. * * @param string|null $source Language code * @return GoogleTranslate */ public function setSource(string $source = null): self { $this->source = $source ?? 'auto'; return $this; } /** * Set Google Translate URL base * * @param string $url Google Translate URL base * @return GoogleTranslate */ public function setUrl(string $url): self { $this->url = $url; return $this; } /** * Set Google Translate client param (webapp, gtx, etc.) * * @param string $client Google Translate client param (webapp, gtx, etc.) * @return GoogleTranslate */ public function setClient(string $client): self { $this->urlParams['client'] = $client; return $this; } /** * Set GuzzleHttp client options. * * @param array $options guzzleHttp client options. * @return GoogleTranslate */ public function setOptions(array $options = null): self { $this->options = $options ?? []; return $this; } /** * Set token provider. * * @param TokenProviderInterface $tokenProvider * @return GoogleTranslate */ public function setTokenProvider(TokenProviderInterface $tokenProvider): self { $this->tokenProvider = $tokenProvider; return $this; } /** * Get last detected source language * * @return string|null Last detected source language */ public function getLastDetectedSource(): ?string { return $this->lastDetectedSource; } /** * Override translate method for static call. * * @param string $string * @param string $target * @param string|null $source * @param array $options * @param TokenProviderInterface|null $tokenProvider * @return null|string * @throws ErrorException If the HTTP request fails * @throws UnexpectedValueException If received data cannot be decoded */ public static function trans(string $string, string $target = 'en', string $source = null, array $options = [], TokenProviderInterface $tokenProvider = null): ?string { return (new self) ->setTokenProvider($tokenProvider ?? new GoogleTokenGenerator) ->setOptions($options) // Options are already set in client constructor tho. ->setSource($source) ->setTarget($target) ->translate($string); } /** * Translate text. * * This can be called from instance method translate() using __call() magic method. * Use $instance->translate($string) instead. * * @param string $string String to translate * @return string|null * @throws ErrorException If the HTTP request fails * @throws UnexpectedValueException If received data cannot be decoded */ public function translate(string $string): ?string { /* * if source lang and target lang are the same * just return the string without any request to google */ if ($this->source == $this->target) return $string; $responseArray = $this->getResponse($string); /* * if response in text and the content has zero the empty returns true, lets check * if response is string and not empty and create array for further logic */ if (is_string($responseArray) && $responseArray != '') { $responseArray = [$responseArray]; } // Check if translation exists if (!isset($responseArray[0]) || empty($responseArray[0])) { return null; } // Detect languages $detectedLanguages = []; // the response contains only single translation, don't create loop that will end with // invalid foreach and warning if (!is_string($responseArray)) { foreach ($responseArray as $item) { if (is_string($item)) { $detectedLanguages[] = $item; } } } // Another case of detected language if (isset($responseArray[count($responseArray) - 2][0][0])) { $detectedLanguages[] = $responseArray[count($responseArray) - 2][0][0]; } // Set initial detected language to null $this->lastDetectedSource = null; // Iterate and set last detected language foreach ($detectedLanguages as $lang) { if ($this->isValidLocale($lang)) { $this->lastDetectedSource = $lang; break; } } // the response can be sometimes an translated string. if (is_string($responseArray)) { return $responseArray; } else { if (is_array($responseArray[0])) { return (string) array_reduce($responseArray[0], function ($carry, $item) { $carry .= $item[0]; return $carry; }); } else { return (string) $responseArray[0]; } } } /** * Get response array. * * @param string $string String to translate * @throws ErrorException If the HTTP request fails * @throws UnexpectedValueException If received data cannot be decoded * @return array|string Response */ public function getResponse(string $string): array { $queryArray = array_merge($this->urlParams, [ 'sl' => $this->source, 'tl' => $this->target, 'tk' => $this->tokenProvider->generateToken($this->source, $this->target, $string), 'q' => $string ]); $queryUrl = preg_replace('/%5B(?:[0-9]|[1-9][0-9]+)%5D=/', '=', http_build_query($queryArray)); try { $response = $this->client->get($this->url, [ 'query' => $queryUrl, ] + $this->options); } catch (RequestException $e) { throw new ErrorException($e->getMessage(), $e->getCode()); } $body = $response->getBody(); // Get response body // Modify body to avoid json errors $bodyJson = preg_replace(array_keys($this->resultRegexes), array_values($this->resultRegexes), $body); // Decode JSON data if (($bodyArray = json_decode($bodyJson, true)) === null) { throw new UnexpectedValueException('Data cannot be decoded or it is deeper than the recursion limit'); } return $bodyArray; } /** * Check if given locale is valid. * * @param string $lang Langauge code to verify * @return bool */ protected function isValidLocale(string $lang): bool { return (bool) preg_match('/^([a-z]{2})(-[A-Z]{2})?$/', $lang); } }
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