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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24 | 'cache_result' => true, |
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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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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 | $this->setParam(array('cache_dir' => '/tmp/xcache_' . md5(COMMON_BASE))); |
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53 | } |
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54 | if (!is_dir($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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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', $param), LOG_DEBUG, __FILE__, __LINE__); |
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94 | return null; |
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95 | } |
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96 | } |
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97 | |
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98 | /* |
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99 | * Return the exchange value between the two given currencies. |
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100 | * |
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101 | * @access public |
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102 | * @param float Base amount to convert from. |
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103 | * @param string 3-letter currency code to convert from. |
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104 | * @param string 3-letter currency code to convert to. |
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105 | * @return mixed Float exchange rate value, or false on error. |
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106 | * @author Quinn Comendant <quinn@strangecode.com> |
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107 | * @version 1.0 |
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108 | * @since 05 May 2008 23:50:59 |
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109 | */ |
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110 | function getValue($amount, $base, $target) |
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111 | { |
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112 | $app =& App::getInstance(); |
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113 | |
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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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118 | $app->logMsg(sprintf('Getting fresh currency exchange rates: %s-to-%s', $base, $target), LOG_DEBUG, __FILE__, __LINE__); |
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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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124 | if (false === $value || !is_numeric($value)) { |
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125 | // Failed retrieving SOAP value. Use cached copy for now. |
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126 | $app->logMsg(sprintf('Failed getting SOAP currency exchange rates: %s-to-%s, using cached copy', $base, $target), LOG_NOTICE, __FILE__, __LINE__); |
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127 | if (!$value = file_get_contents($cache_file_path)) { |
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128 | $app->logMsg(sprintf('Failed reading target rate file: %s', $cache_file_path), LOG_ERR, __FILE__, __LINE__); |
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129 | return false; |
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130 | } |
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131 | } else if ($this->getParam('cache_result') && !filePutContents($cache_file_path, $value, LOCK_EX)) { |
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132 | $app->logMsg(sprintf('Failed writing to target rate file: %s', $cache_file_path), LOG_ERR, __FILE__, __LINE__); |
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133 | return false; |
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134 | } |
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135 | } else { |
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136 | $app->logMsg(sprintf('Getting cached currency exchange rates: %s-to-%s', $base, $target), LOG_DEBUG, __FILE__, __LINE__); |
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137 | if (!$value = file_get_contents($cache_file_path)) { |
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138 | $app->logMsg(sprintf('Failed reading target rate file: %s', $cache_file_path), LOG_ERR, __FILE__, __LINE__); |
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139 | return false; |
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140 | } |
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141 | } |
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142 | return trim($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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