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| 1 | <?php |
| 2 | /** |
| 3 | * @see https://www.bitstamp.net/api/ |
| 4 | * |
| 5 | * Rate limit is "8000 requests per 10 minutes". |
| 6 | * |
| 7 | * @package brianhenryie/bh-wp-bitcoin-gateway |
| 8 | */ |
| 9 | |
| 10 | namespace BrianHenryIE\WP_Bitcoin_Gateway\API\Exchange_Rate; |
| 11 | |
| 12 | use BrianHenryIE\WP_Bitcoin_Gateway\API\Exchange_Rate_API_Interface; |
| 13 | use Psr\Log\LoggerAwareTrait; |
| 14 | use Psr\Log\LoggerInterface; |
| 15 | |
| 16 | class Bitstamp_API implements Exchange_Rate_API_Interface { |
| 17 | use LoggerAwareTrait; |
| 18 | |
| 19 | public function __construct( LoggerInterface $logger ) { |
| 20 | $this->setLogger( $logger ); |
| 21 | } |
| 22 | |
| 23 | /** |
| 24 | * Fetch the current exchange from a remote API. |
| 25 | * |
| 26 | * @return string |
| 27 | */ |
| 28 | public function get_exchange_rate( string $currency ): string { |
| 29 | |
| 30 | $between = strtolower( "btc{$currency}" ); |
| 31 | |
| 32 | $valid_exchanges = array( 'btcusd', 'btceur', 'btcgbp' ); |
| 33 | |
| 34 | if ( ! in_array( $between, $valid_exchanges, true ) ) { |
| 35 | throw new \Exception( 'Bitstamp only supports USD, EUR and GBP.' ); |
| 36 | } |
| 37 | |
| 38 | $url = "https://www.bitstamp.net/api/v2/ticker/{$between}/"; |
| 39 | |
| 40 | $request_response = wp_remote_get( $url ); |
| 41 | |
| 42 | if ( is_wp_error( $request_response ) ) { |
| 43 | throw new \Exception(); |
| 44 | } |
| 45 | |
| 46 | if ( 200 !== $request_response['response']['code'] ) { |
| 47 | throw new \Exception(); |
| 48 | } |
| 49 | |
| 50 | /** |
| 51 | * last Last BTC price. |
| 52 | * high Last 24 hours price high. |
| 53 | * low Last 24 hours price low. |
| 54 | * vwap Last 24 hours volume weighted average price. |
| 55 | * volume Last 24 hours volume. |
| 56 | * bid Highest buy order. |
| 57 | * ask Lowest sell order. |
| 58 | * timestamp Unix timestamp date and time. |
| 59 | * open First price of the day. |
| 60 | */ |
| 61 | $response = json_decode( $request_response['body'], true ); |
| 62 | |
| 63 | return $response['last']; |
| 64 | } |
| 65 | } |