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<?php |
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|
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namespace Monei\Repositories; |
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|
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use Monei\MoneiClient; |
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use Exception; |
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|
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class PaymentMethodsRepository implements PaymentMethodsRepositoryInterface { |
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/** |
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* Cached marker for "the API said no". Distinct from an empty array so the |
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* cache can hold it: an empty array is falsy and would be re-fetched. |
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*/ |
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private const UNAVAILABLE = array( |
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'paymentMethods' => array(), |
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'metadata' => array(), |
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); |
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|
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private $accountId; |
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private MoneiClient $moneiClient; |
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|
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public function __construct( string $accountId, MoneiClient $moneiClient ) { |
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$this->accountId = $accountId; |
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$this->moneiClient = $moneiClient; |
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} |
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|
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/** |
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* Fetch payment methods from the API. |
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*/ |
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private function fetchFromAPI(): ?array { |
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// The account id no longer reaches the API — getAllowed() derives the account |
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// from the API key. It still gates the call because it is what separates the |
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// test cache from the live one, and because an unset one means the plugin is |
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// not configured yet. |
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if ( ! $this->accountId ) { |
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return null; |
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} |
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try { |
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// /allowed-payment-methods, the API key authenticated replacement for the |
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// deprecated /payment-methods. Amount, currency and country are left out on |
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// purpose: this repository is a container singleton that answers admin |
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// screens as well as the checkout, so it has no one cart to describe. |
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$response = $this->moneiClient->paymentMethods->getAllowed(); |
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} catch ( Exception $e ) { |
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$response = null; |
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} |
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|
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return $response ? json_decode( $response, true ) : array(); |
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} |
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|
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/** |
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* Get payment methods (fetch from transient or API). |
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*/ |
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public function getPaymentMethods(): array { |
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$transientKey = $this->generateTransientKey( $this->accountId ); |
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$data = get_transient( $transientKey ); |
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|
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if ( ! $data ) { |
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$data = $this->fetchFromAPI(); |
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if ( $data ) { |
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set_transient( $transientKey, $data, 30 ); |
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set_transient( $this->fallbackKey( $transientKey ), $data, HOUR_IN_SECONDS ); |
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} else { |
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// An empty answer marks every gateway unavailable, which takes |
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// the payment methods off the checkout. The 30 second cache |
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// makes that one failed call away at any moment, so fall back |
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// to the last answer that worked. |
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$data = get_transient( $this->fallbackKey( $transientKey ) ); |
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if ( ! $data ) { |
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// No answer has ever worked: a wrong or missing API key. An |
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// empty array is falsy, so it never reached the cache and |
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// every checkout render repeated the failing call. One |
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// store did this 15 times a second for a week. |
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$data = self::UNAVAILABLE; |
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} |
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// Without this every request during an outage repeats the |
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// failing call. |
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set_transient( $transientKey, $data, 30 ); |
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} |
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} |
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|
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return $data === self::UNAVAILABLE ? array() : ( $data ?: array() ); |
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} |
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|
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/** |
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* Generate a transient key. |
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*/ |
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private function generateTransientKey( string $key ): string { |
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return 'payment_methods_' . md5( $key ); |
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} |
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|
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/** |
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* Key of the longer lived copy used when the API call fails. |
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*/ |
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private function fallbackKey( string $transientKey ): string { |
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return $transientKey . '_last_ok'; |
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} |
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} |
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|
