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<?php
/**
 * Contains a class for querying external translation service.
 *
 * @file
 * @author Niklas Laxström
 * @author Ulrich Strauss
 * @license GPL-2.0-or-later
 */

/**
 * Implements support for Microsoft translation api v2.
 * @see https://msdn.microsoft.com/en-us/library/ff512421.aspx
 * @ingroup TranslationWebService
 * @since 2013-01-01
 */
class MicrosoftWebService extends TranslationWebService {
	public function getType() {
		return 'mt';
	}

	protected function mapCode( $code ) {
		$map = [
			'zh-hant' => 'zh-CHT',
			'zh-hans' => 'zh-CHS',
		];

		return isset( $map[$code] ) ? $map[$code] : $code;
	}

	protected function getMSTokens( $clientID, $clientSecret ) {
		$authUrl = "https://datamarket.accesscontrol.windows.net/v2/OAuth2-13/";

		$params = [
			'grant_type' => "client_credentials",
			'scope' => "http://api.microsofttranslator.com",
			'client_id' => $clientID,
			'client_secret' => $clientSecret
		];

		$params = wfArrayToCgi( $params );

		$options['method']   = 'POST';
		$options['timeout']  = $this->config['timeout'];
		$options['postData'] = $params;

		$req = MWHttpRequest::factory( $authUrl, $options );

		$status = $req->execute();

		if ( !$status->isOK() ) {
			$error = $req->getContent();
			// Most likely a timeout or other general error
			throw new TranslationWebServiceException(
				'Http::get failed: ' . $authUrl . serialize( $error ) . serialize( $status )
			);
		}
		$ret = $req->getContent();

		$response = json_decode( $ret, true );
		if ( isset( $response['error'] ) ) {
			throw new TranslationWebServiceException( $response['error_description'] );
		}

		return $response['access_token'];
	}

	protected function doPairs() {
		if ( !isset( $this->config['clientId'] ) || !isset( $this->config['clientSecret'] ) ) {
			throw new TranslationWebServiceConfigurationException( 'clientId or clientSecret is not set' );
		}

		$clientID = $this->config['clientId'];
		$clientSecret = $this->config['clientSecret'];

		// get access token from service
		$accessToken = $this->getMSTokens( $clientID, $clientSecret );

		$options = [];
		$options['method']  = 'GET';
		$options['timeout'] = $this->config['timeout'];

		$url = 'http://api.microsofttranslator.com/V2/Http.svc/GetLanguagesForTranslate?';

		$req = MWHttpRequest::factory( $url, $options );
		$req->setHeader( 'Authorization', "Bearer $accessToken" );

		$status = $req->execute();
		if ( !$status->isOK() ) {
			$error = $req->getContent();
			// Most likely a timeout or other general error
			throw new TranslationWebServiceException(
				'Http::get failed:' . serialize( $error ) . serialize( $status )
			);
		}
		$xml = simplexml_load_string( $req->getContent() );

		$languages = [];
		foreach ( $xml->string as $language ) {
			$languages[] = (string)$language;
		}

		// Let's make a cartesian product, assuming we can translate from any language to any language
		$pairs = [];
		foreach ( $languages as $from ) {
			foreach ( $languages as $to ) {
				$pairs[$from][$to] = true;
			}
		}

		return $pairs;
	}

	protected function getQuery( $text, $from, $to ) {
		if ( !isset( $this->config['clientId'] ) || !isset( $this->config['clientSecret'] ) ) {
			throw new TranslationWebServiceConfigurationException(
				'clientId or clientSecret is not set'
			);
		}

		$text = trim( $text );
		$text = $this->wrapUntranslatable( $text );

		// get access token from service
		$accessToken = $this->getMSTokens(
			$this->config['clientId'],
			$this->config['clientSecret']
		);

		$params = [
			'text' => $text,
			'from' => $from,
			'to' => $to,
		];
		$headers = [
			'Authorization' => 'Bearer ' . $accessToken,
		];

		return TranslationQuery::factory( $this->config['url'] )
			->timeout( $this->config['timeout'] )
			->queryParameters( $params )
			->queryHeaders( $headers );
	}

	protected function parseResponse( TranslationQueryResponse $reply ) {
		$body = $reply->getBody();

		$text = preg_replace( '~<string.*>(.*)</string>~s', '\\1', $body );
		$text = Sanitizer::decodeCharReferences( $text );
		$text = $this->unwrapUntranslatable( $text );

		return $text;
	}

	/// Override from parent
	protected function wrapUntranslatable( $text ) {
		$pattern = '~%[^% ]+%|\$\d|{VAR:[^}]+}|{?{(PLURAL|GRAMMAR|GENDER):[^|]+\||%(\d\$)?[sd]~';
		$wrap = '<span translate="no">\0</span>';
		return preg_replace( $pattern, $wrap, $text );
	}

	/// Override from parent
	protected function unwrapUntranslatable( $text ) {
		$pattern = '~<span translate="no">(.*?)</span>~';
		return preg_replace( $pattern, '\1', $text );
	}
}

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