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<?php |
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/* |
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* This file is part of the Exchange Rate package, an RunOpenCode project. |
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* |
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* Implementation of exchange rate crawler for National Bank of Serbia, http://www.nbs.rs. |
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* |
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* (c) 2017 RunOpenCode |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace RunOpenCode\ExchangeRate\NationalBankOfSerbia\Util; |
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use GuzzleHttp\Client; |
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use GuzzleHttp\Cookie\CookieJar; |
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use Psr\Http\Message\StreamInterface; |
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use RunOpenCode\ExchangeRate\NationalBankOfSerbia\Enum\RateType; |
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use RunOpenCode\ExchangeRate\NationalBankOfSerbia\Exception\RuntimeException; |
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use Symfony\Component\DomCrawler\Crawler; |
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/** |
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* Class NbsBrowser |
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* |
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* Browser browses trough web site of National Bank of Serbia and fetches documents with rates. |
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* |
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* @package RunOpenCode\ExchangeRate\NationalBankOfSerbia\Util |
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*/ |
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class NbsBrowser |
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{ |
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const SOURCE = 'https://www.nbs.rs/kursnaListaModul/naZeljeniDan.faces'; |
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/** |
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* @var Client |
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*/ |
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private $guzzleClient; |
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/** |
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* @var CookieJar |
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*/ |
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private $guzzleCookieJar; |
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/** |
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* Get XML document with rates. |
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* |
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* @param \DateTime $date |
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* @param string $rateType |
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* @return StreamInterface |
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*/ |
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public function getXmlDocument(\DateTime $date, $rateType) |
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{ |
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return $this->request('POST', array(), array( |
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'index:brKursneListe:' => '', |
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'index:yearInner' => $date->format('Y'), |
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'index:inputCalendar1' => $date->format('d/m/Y'), |
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'index:vrstaInner' => call_user_func(function ($rateType) { |
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switch ($rateType) { |
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case RateType::FOREIGN_EXCHANGE_BUYING: // FALL TROUGH |
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case RateType::FOREIGN_EXCHANGE_SELLING: |
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return 1; |
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case RateType::FOREIGN_CASH_BUYING: // FALL TROUGH |
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case RateType::FOREIGN_CASH_SELLING: |
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return 2; |
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default: |
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return 3; |
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} |
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}, $rateType), |
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'index:prikazInner' => 3, // XML |
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'index:buttonShow' => 'Show', |
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'index' => 'index', |
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'javax.faces.ViewState' => $this->getFormCsrfToken(), |
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)); |
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} |
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/** |
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* Execute HTTP request and get raw body response. |
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* |
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* @param string $method HTTP Method. |
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* @param array $params Params to send with request. |
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* @return StreamInterface |
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*/ |
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private function request($method, array $query = array(), array $params = array()) |
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{ |
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$client = $this->getGuzzleClient(); |
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$response = $client->request($method, self::SOURCE, array( |
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'cookies' => $this->getGuzzleCookieJar(), |
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'form_params' => $params, |
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'query' => $query, |
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)); |
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return $response->getBody(); |
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} |
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/** |
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* Get NBS's form CSRF token. |
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* |
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* @return string CSRF token. |
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* |
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* @throws \RuntimeException When API is changed. |
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*/ |
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private function getFormCsrfToken() |
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{ |
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$crawler = new Crawler($this->request('GET')->getContents()); |
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$hiddens = $crawler->filter('input[type="hidden"]'); |
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/** |
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* @var \DOMElement $hidden |
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*/ |
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foreach ($hiddens as $hidden) { |
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if ($hidden->getAttribute('name') === 'javax.faces.ViewState') { |
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return $hidden->getAttribute('value'); |
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} |
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} |
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throw new RuntimeException('FATAL ERROR: National Bank of Serbia changed it\'s API, unable to extract token.'); // @codeCoverageIgnore |
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} |
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/** |
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* Get Guzzle Client. |
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* |
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* @return Client |
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*/ |
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private function getGuzzleClient() |
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{ |
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if ($this->guzzleClient === null) { |
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$this->guzzleClient = new Client(array('cookies' => true)); |
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} |
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return $this->guzzleClient; |
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} |
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/** |
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* Get Guzzle CookieJar. |
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* |
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* @return CookieJar |
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*/ |
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private function getGuzzleCookieJar() |
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{ |
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if ($this->guzzleCookieJar === null) { |
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$this->guzzleCookieJar = new CookieJar(); |
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} |
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return $this->guzzleCookieJar; |
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} |
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} |
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RunOpenCode /
exchange-rate-nbs
