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<?php
/**
* Contains a class for querying external translation service.
*
* @file
* @author Carsten Schmitz / LimeSurvey GmbH
* @license GPL-2.0-or-later
*/
/**
* Implements support for Google Translate API
* @see https://cloud.google.com/translate/docs/reference/rest
* @ingroup TranslationWebService
* @since 2020.05
*/
class GoogleTranslateWebService extends TranslationWebService {
private const PUBLIC_API = 'https://translation.googleapis.com/language/translate/v2';
/** @inheritDoc */
public function getType() {
return 'mt';
}
/** @inheritDoc */
protected function mapCode( $code ) {
/** @phpcs-require-sorted-array */
$map = [
'be-tarask' => 'be',
'zh-cn' => 'zh-CN',
'zh-hans' => 'zh-CN',
'zh-hant' => 'zh-TW',
'zh-tw' => 'zh-TW',
];
return $map[$code] ?? $code;
}
/** @inheritDoc */
public function isSupportedLanguagePair( $from, $to ) {
$pairs = $this->getSupportedLanguagePairs();
$from = $this->mapCode( $from );
$to = $this->mapCode( $to );
// As long as the source & target language exist at Google it is fine
return isset( $pairs[$from] ) && isset( $pairs[$to] ) && $from !== $to;
}
/** @inheritDoc */
protected function doPairs() {
if ( !isset( $this->config['key'] ) ) {
throw new TranslationWebServiceConfigurationException( 'API key is not set' );
}
$api = $this->config['pairs'] ?? self::PUBLIC_API . '/languages';
$params = [
'key' => $this->config['key'],
];
$json = Http::get(
wfAppendQuery( $api, wfArrayToCgi( $params ) ),
[ 'timeout' => $this->config['timeout'] ],
__METHOD__
);
$response = FormatJson::decode( $json );
if ( !is_object( $response ) ) {
$exception = 'Malformed reply from remote server: ' . (string)$json;
throw new TranslationWebServiceException( $exception );
}
$pairs = [];
foreach ( $response->data->languages as $language ) {
// Google can translate from any language to any language
$pairs[$language->language] = true;
}
return $pairs;
}
/** @inheritDoc */
protected function getQuery( $text, $from, $to ) {
if ( !isset( $this->config['key'] ) ) {
throw new TranslationWebServiceConfigurationException( 'API key is not set' );
}
# https://cloud.google.com/translate/docs/reference/translate
if ( strlen( $text ) > 10000 ) {
// There is no limitation but we don't want the translation service to be abused, don't we?
throw new TranslationWebServiceInvalidInputException( 'Source text too long' );
}
$url = $this->config['url'] ?? self::PUBLIC_API;
$text = trim( $text );
$text = $this->wrapUntranslatable( $text );
return TranslationQuery::factory( $url )
->timeout( $this->config['timeout'] ?? 3 )
->postWithData( wfArrayToCgi( [
'key' => $this->config['key'],
'q' => $text,
'target' => $to,
'source' => $from,
'format' => 'html',
] ) );
}
/** @inheritDoc */
protected function parseResponse( TranslationQueryResponse $reply ) {
$body = $reply->getBody();
$response = FormatJson::decode( $body );
if ( !is_object( $response ) ) {
throw new TranslationWebServiceException( 'Invalid json: ' . serialize( $body ) );
}
$text = Sanitizer::decodeCharReferences( $response->data->translations[0]->translatedText );
$text = $this->unwrapUntranslatable( $text );
return trim( $text );
}
}
|
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