[328] | 1 | <?php |
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| 2 | /** |
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| 3 | * Currency.inc.php |
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| 4 | * code by strangecode :: www.strangecode.com :: this document contains copyrighted information |
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| 5 | * |
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| 6 | * Class to convert currency values. |
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| 7 | * |
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| 8 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 9 | * @version 1.0 |
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| 10 | * |
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| 11 | * Example of use: |
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| 12 | --------------------------------------------------------------------- |
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| 13 | $currency = new Currency(); |
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| 14 | echo $currency->getValue(1, 'eur', 'usd'); |
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| 15 | --------------------------------------------------------------------- |
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| 16 | */ |
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| 17 | |
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| 18 | require_once 'SOAP/Client.php'; |
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| 19 | |
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| 20 | class Currency { |
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| 21 | |
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| 22 | // Configuration parameters for this object. |
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| 23 | var $_params = array( |
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[329] | 24 | 'cache_result' => true, |
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[328] | 25 | 'cache_dir' => '', |
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| 26 | 'cache_age' => 28800, // 8 hours. |
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| 27 | 'soap_api_url' => 'http://xurrency.com/servidor_soap.php', |
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| 28 | ); |
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| 29 | |
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| 30 | // Object to hold SOAP_Client instance. |
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| 31 | var $_soap_client; |
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| 32 | |
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| 33 | /** |
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| 34 | * Cart constructor. |
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| 35 | */ |
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| 36 | function Currency($params=array()) |
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| 37 | { |
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| 38 | $app =& App::getInstance(); |
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| 39 | |
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| 40 | // Initialize. |
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| 41 | if (!isset($_SESSION['_currency'])) { |
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| 42 | $_SESSION['_currency'] = array(); |
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| 43 | } |
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| 44 | |
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| 45 | // Set custom parameters. |
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| 46 | $this->setParam($params); |
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| 47 | |
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| 48 | // Setup cache directory. |
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[329] | 49 | if ($this->getParam('cache_result')) { |
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| 50 | if ('' == $this->getParam('cache_dir')) { |
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| 51 | // Use a sane default cache directory. |
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| 52 | $this->setParam(array('cache_dir' => '/tmp/xcache_' . md5(COMMON_BASE))); |
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[328] | 53 | } |
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[329] | 54 | if (!is_dir($this->getParam('cache_dir'))) { |
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| 55 | $app->logMsg(sprintf('Creating cache_dir: %s', $this->getParam('cache_dir')), LOG_INFO, __FILE__, __LINE__); |
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| 56 | if (!mkdir($this->getParam('cache_dir'))) { |
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| 57 | $app->logMsg(sprintf('Could not create cache_dir: %s', $this->getParam('cache_dir')), LOG_WARNING, __FILE__, __LINE__); |
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| 58 | } |
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| 59 | } |
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[328] | 60 | } |
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| 61 | |
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| 62 | // Setup SOAP object. |
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| 63 | $this->_soap_client = new SOAP_Client($this->getParam('soap_api_url')); |
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| 64 | } |
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| 65 | |
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| 66 | /** |
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| 67 | * Set the params of this object. |
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| 68 | * |
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| 69 | * @param array $params Array of param keys and values to set. |
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| 70 | */ |
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| 71 | function setParam($params=null) |
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| 72 | { |
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| 73 | if (isset($params) && is_array($params)) { |
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| 74 | // Merge new parameters with old overriding only those passed. |
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| 75 | $this->_params = array_merge($this->_params, $params); |
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| 76 | } |
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| 77 | } |
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| 78 | |
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| 79 | /** |
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| 80 | * Return the value of a parameter, if it exists. |
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| 81 | * |
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| 82 | * @access public |
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| 83 | * @param string $param Which parameter to return. |
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| 84 | * @return mixed Configured parameter value. |
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| 85 | */ |
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| 86 | function getParam($param) |
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| 87 | { |
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| 88 | $app =& App::getInstance(); |
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| 89 | |
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| 90 | if (isset($this->_params[$param])) { |
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| 91 | return $this->_params[$param]; |
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| 92 | } else { |
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| 93 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
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| 94 | return null; |
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| 95 | } |
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| 96 | } |
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| 97 | |
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| 98 | /* |
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| 99 | * Return the exchange value between the two given currencies. |
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| 100 | * |
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| 101 | * @access public |
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[329] | 102 | * @param float Base amount to convert from. |
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| 103 | * @param string 3-letter currency code to convert from. |
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| 104 | * @param string 3-letter currency code to convert to. |
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| 105 | * @return mixed Float exchange rate value, or false on error. |
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[328] | 106 | * @author Quinn Comendant <quinn@strangecode.com> |
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| 107 | * @version 1.0 |
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| 108 | * @since 05 May 2008 23:50:59 |
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| 109 | */ |
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| 110 | function getValue($amount, $base, $target) |
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| 111 | { |
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| 112 | $app =& App::getInstance(); |
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[330] | 113 | |
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[328] | 114 | $cache_file_path = sprintf('%s/%s-to-%s', $this->getParam('cache_dir'), $base, $target); |
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| 115 | $cache_file_mtime = @filemtime($cache_file_path); |
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| 116 | if (!$this->getParam('cache_result') || !$cache_file_mtime || $cache_file_mtime < time() - $this->getParam('cache_age')) { |
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| 117 | // Get fresh data and create cached file if missing or expired. |
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[329] | 118 | $app->logMsg(sprintf('Getting fresh currency exchange rates: %s-to-%s', $base, $target), LOG_DEBUG, __FILE__, __LINE__); |
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[328] | 119 | $value = $this->_performAPICall('getValue', array( |
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| 120 | 'amount' => $amount, |
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| 121 | 'base' => $base, |
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| 122 | 'target' => $target |
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| 123 | )); |
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[329] | 124 | if (false === $value || !is_numeric($value)) { |
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[334] | 125 | // Failed retrieving SOAP value. Use cached copy for now. |
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[329] | 126 | $app->logMsg(sprintf('Failed getting SOAP currency exchange rates: %s-to-%s, using cached copy', $base, $target), LOG_NOTICE, __FILE__, __LINE__); |
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[328] | 127 | if (!$value = file_get_contents($cache_file_path)) { |
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| 128 | $app->logMsg(sprintf('Failed reading target rate file: %s', $cache_file_path), LOG_ERR, __FILE__, __LINE__); |
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[329] | 129 | return false; |
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[328] | 130 | } |
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[330] | 131 | } else if ($this->getParam('cache_result') && !filePutContents($cache_file_path, $value, LOCK_EX)) { |
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[328] | 132 | $app->logMsg(sprintf('Failed writing to target rate file: %s', $cache_file_path), LOG_ERR, __FILE__, __LINE__); |
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[329] | 133 | return false; |
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[328] | 134 | } |
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| 135 | } else { |
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[329] | 136 | $app->logMsg(sprintf('Getting cached currency exchange rates: %s-to-%s', $base, $target), LOG_DEBUG, __FILE__, __LINE__); |
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[328] | 137 | if (!$value = file_get_contents($cache_file_path)) { |
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| 138 | $app->logMsg(sprintf('Failed reading target rate file: %s', $cache_file_path), LOG_ERR, __FILE__, __LINE__); |
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[329] | 139 | return false; |
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[328] | 140 | } |
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| 141 | } |
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| 142 | return trim($value); |
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| 143 | } |
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| 144 | |
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| 145 | /** |
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| 146 | * @param string |
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| 147 | * @param array |
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| 148 | * @return mixed |
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| 149 | * @access private |
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| 150 | */ |
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| 151 | function _performAPICall($api_call, $parameters=null) |
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| 152 | { |
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| 153 | $app =& App::getInstance(); |
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| 154 | |
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| 155 | $result = $this->_soap_client->call($api_call, $parameters); |
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| 156 | |
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| 157 | if (PEAR::isError($result)) { |
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| 158 | $app->logMsg(sprintf('SOAP Pear error: %s', $result->getMessage()), LOG_WARNING, __FILE__, __LINE__); |
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| 159 | return false; |
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| 160 | } |
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| 161 | |
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| 162 | return $result; |
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| 163 | } |
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| 164 | } |
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| 165 | |
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| 166 | |
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| 167 | ?> |
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