1 | <?php |
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2 | /* |
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3 | * The Strangecode Codebase - a general application development framework for PHP |
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4 | * For details visit the project site: <http://trac.strangecode.com/> |
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5 | * Copyright © 2019 Strangecode, LLC |
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6 | * |
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7 | * This program is free software: you can redistribute it and/or modify |
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8 | * it under the terms of the GNU General Public License as published by |
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9 | * the Free Software Foundation, either version 3 of the License, or |
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10 | * (at your option) any later version. |
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11 | * |
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12 | * This program is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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15 | * GNU General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU General Public License |
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18 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
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19 | */ |
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20 | |
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21 | /* |
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22 | * PDO.inc.php |
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23 | * |
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24 | * |
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25 | * |
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26 | * @author Quinn Comendant <quinn@strangecode.com> |
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27 | * @version 1.0 |
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28 | * @since 09 Jul 2019 08:11:03 |
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29 | * |
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30 | * Example of use: |
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31 | --------------------------------------------------------------------- |
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32 | $x = new PDO(); |
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33 | $x->setParam(array('foo' => 'bar')); |
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34 | $x->doIt(); |
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35 | echo $x->getIt(); |
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36 | --------------------------------------------------------------------- |
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37 | */ |
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38 | namespace Strangecode\Codebase; |
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39 | use \App; |
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40 | |
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41 | class PDO |
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42 | { |
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43 | // A place to keep an object instance for the singleton pattern. |
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44 | protected static $instance = null; |
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45 | |
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46 | // If $db->connect has successfully opened a db connection. |
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47 | protected $_connected = false; |
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48 | |
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49 | // Database handle. |
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50 | public $dbh; |
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51 | |
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52 | // Count how many queries run during the whole instance. |
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53 | protected $_query_count = 0; |
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54 | |
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55 | // Hash of DB parameters. |
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56 | protected $_params = array( |
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57 | |
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58 | // DB passwords should be set as apache environment variables in httpd.conf, readable only by root. |
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59 | 'db_server' => 'localhost', |
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60 | 'db_name' => null, |
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61 | 'db_user' => null, |
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62 | 'db_pass' => null, |
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63 | |
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64 | // Display all SQL queries. FALSE recommended for production sites. |
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65 | 'db_always_debug' => false, |
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66 | |
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67 | // Display db errors. FALSE recommended for production sites. |
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68 | 'db_debug' => false, |
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69 | |
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70 | // Script stops on db error. TRUE recommended for production sites. |
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71 | 'db_die_on_failure' => true, |
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72 | |
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73 | // Special date settings. These will dynamically changes depending on MySQL version or settings. |
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74 | 'zero_date' => '0000-00-00', |
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75 | 'infinity_date' => '9999-12-31', |
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76 | |
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77 | // Timezone for MySQL. |
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78 | 'timezone' => 'UTC', |
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79 | |
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80 | // MySQL character set and collation. |
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81 | 'character_set' => '', |
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82 | 'collation' => '', |
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83 | |
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84 | // Reconnection attempt limit. Set to 0 to disable retries, i.e., only the first connect will be attempted. |
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85 | 'retry_limit' => 8, |
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86 | ); |
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87 | |
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88 | // Translate between HTML and MySQL character set names. |
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89 | public $mysql_character_sets = array( |
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90 | 'utf-8' => 'utf8mb4', |
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91 | 'iso-8859-1' => 'latin1', |
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92 | ); |
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93 | |
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94 | // Caches. |
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95 | protected static $existing_tables = null; |
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96 | protected static $table_columns = []; |
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97 | |
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98 | /** |
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99 | * PDO constructor. |
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100 | * |
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101 | * @access public |
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102 | * @param string $namespace Namespace for this object, used to avoid collisions in global contexts. |
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103 | * @param string $params Configuration parameters for this object. |
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104 | */ |
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105 | public function __construct($params=null) |
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106 | { |
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107 | // Set custom parameters. |
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108 | $this->setParam($params); |
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109 | } |
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110 | |
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111 | /** |
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112 | * This method enforces the singleton pattern for this class. |
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113 | * |
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114 | * @return object Reference to the global DB object. |
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115 | * @access public |
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116 | * @static |
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117 | */ |
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118 | public static function &getInstance() |
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119 | { |
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120 | if (self::$instance === null) { |
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121 | self::$instance = new self(); |
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122 | } |
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123 | |
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124 | return self::$instance; |
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125 | } |
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126 | |
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127 | /** |
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128 | * Set the params of this object. |
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129 | * |
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130 | * @access public |
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131 | * @param array $params Array of param keys and values to set. |
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132 | */ |
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133 | public function setParam($params=null) |
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134 | { |
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135 | if (isset($params) && is_array($params)) { |
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136 | // Merge new parameters with old overriding only those passed. |
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137 | $this->_params = array_merge($this->_params, $params); |
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138 | } |
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139 | } |
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140 | |
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141 | /** |
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142 | * Return the value of a parameter, if it exists. |
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143 | * |
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144 | * @access public |
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145 | * @param string $param Which parameter to return. |
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146 | * @return mixed Configured parameter value. |
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147 | */ |
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148 | public function getParam($param) |
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149 | { |
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150 | $app =& App::getInstance(); |
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151 | |
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152 | if (isset($this->_params[$param])) { |
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153 | return $this->_params[$param]; |
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154 | } else { |
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155 | $app->logMsg(sprintf('Parameter is not set: %s', $param), LOG_DEBUG, __FILE__, __LINE__); |
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156 | return null; |
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157 | } |
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158 | } |
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159 | |
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160 | /* |
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161 | * Connect to database with credentials in params. |
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162 | * |
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163 | * @access public |
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164 | * @param |
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165 | * @return |
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166 | * @author Quinn Comendant <quinn@strangecode.com> |
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167 | * @since 09 Jul 2019 08:16:42 |
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168 | */ |
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169 | public function connect($retry_num=0) |
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170 | { |
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171 | $app =& App::getInstance(); |
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172 | |
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173 | if (!$this->getParam('db_name') || !$this->getParam('db_user') || !$this->getParam('db_pass')) { |
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174 | $app->logMsg('Database credentials missing.', LOG_EMERG, __FILE__, __LINE__); |
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175 | return false; |
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176 | } |
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177 | |
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178 | // If db_server not specified, assume localhost. |
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179 | if (null === $this->_params['db_server']) { |
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180 | $this->setParam(array('db_server' => 'localhost')); |
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181 | } |
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182 | |
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183 | // If the mysql charset is not defined, try to determine a mysql charset from the app charset. |
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184 | if ('' == $this->getParam('character_set') && '' != $app->getParam('character_set') && isset($this->mysql_character_sets[mb_strtolower($app->getParam('character_set'))])) { |
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185 | $this->setParam(array('character_set' => $this->mysql_character_sets[mb_strtolower($app->getParam('character_set'))])); |
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186 | } |
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187 | |
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188 | try { |
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189 | // Set charset in DSN and disable emulated prepares as per https://stackoverflow.com/questions/134099/are-pdo-prepared-statements-sufficient-to-prevent-sql-injection/12202218 |
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190 | $dsn = sprintf('mysql:host=%s;dbname=%s;charset=%s', $this->getParam('db_server'), $this->getParam('db_name'), $this->getParam('character_set')); |
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191 | $options = [ |
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192 | \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION, |
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193 | \PDO::ATTR_DEFAULT_FETCH_MODE => \PDO::FETCH_ASSOC, |
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194 | \PDO::ATTR_EMULATE_PREPARES => false, |
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195 | ]; |
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196 | $this->dbh = new \PDO($dsn, $this->getParam('db_user'), $this->getParam('db_pass'), $options); |
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197 | } catch (\PDOException $e) { |
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198 | $mysql_error_msg = sprintf('PDO connect %s: %s (db_server=%s, db_name=%s, db_user=%s, db_pass=%s)%s', |
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199 | get_class($e), |
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200 | $e->getMessage(), |
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201 | $this->getParam('db_server'), |
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202 | $this->getParam('db_name'), |
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203 | $this->getParam('db_user'), |
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204 | ('' == $this->getParam('db_pass') ? 'NO' : 'YES'), |
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205 | ($retry_num > 0 ? ' retry ' . $retry_num : '') |
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206 | ); |
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207 | // Use LOG_NOTICE for first connection attempts, and LOG_EMERG for the last one. |
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208 | $app->logMsg($mysql_error_msg, ($retry_num >= $this->getParam('retry_limit') ? LOG_EMERG : LOG_NOTICE), __FILE__, __LINE__); |
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209 | |
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210 | // These are probably transient errors: |
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211 | // SQLSTATE[HY000] [2002] Connection refused |
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212 | // SQLSTATE[HY000] [2002] No such file or directory |
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213 | // SQLSTATE[HY000] [2006] MySQL server has gone away |
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214 | if ($retry_num < $this->getParam('retry_limit') && (strpos($e->getMessage(), '[2002]') !== false || strpos($e->getMessage(), '[2006]') !== false)) { |
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215 | // Try again after a delay: |
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216 | usleep(500000); |
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217 | return $this->connect(++$retry_num); |
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218 | } |
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219 | |
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220 | // Print helpful or pretty error? |
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221 | if ($this->getParam('db_debug') && $app->getParam('display_errors')) { |
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222 | if (!$app->isCLI()) { |
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223 | printf('<pre style="padding:1em;background:#ddd;font:10px monospace;">%s</pre>', $mysql_error_msg); |
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224 | } |
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225 | } |
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226 | |
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227 | // Die if db_die_on_failure = true, or just continue without connection. |
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228 | return $this->_fail(); |
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229 | } |
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230 | |
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231 | // DB connection success! |
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232 | $this->_connected = true; |
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233 | |
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234 | // Update config for this version of MySQL. |
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235 | if (version_compare($this->dbh->getAttribute(\PDO::ATTR_SERVER_VERSION), '5.7.4', '>=')) { |
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236 | $this->setParam(array('zero_date' => '1000-01-01')); |
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237 | } |
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238 | |
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239 | // Set MySQL session timezone. |
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240 | if ($this->getParam('timezone')) { |
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241 | // https://dev.mysql.com/doc/refman/5.5/en/time-zone-support.html |
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242 | $this->dbh->query(sprintf("SET time_zone = '%s'", $this->getParam('timezone'))); |
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243 | } |
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244 | |
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245 | return true; |
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246 | } |
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247 | |
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248 | /** |
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249 | * Close db connection. |
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250 | * |
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251 | * @access public |
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252 | * @author Quinn Comendant <quinn@strangecode.com> |
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253 | * @since 28 Aug 2005 14:32:01 |
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254 | */ |
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255 | public function close() |
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256 | { |
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257 | $this->_connected = false; |
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258 | $this->dbh = null; |
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259 | |
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260 | return true; |
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261 | } |
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262 | |
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263 | /* |
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264 | * |
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265 | * |
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266 | * @access public |
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267 | * @param |
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268 | * @return |
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269 | * @author Quinn Comendant <quinn@strangecode.com> |
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270 | * @version 1.0 |
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271 | * @since 03 Jul 2013 14:50:23 |
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272 | */ |
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273 | public function reconnect() |
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274 | { |
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275 | $this->close(); |
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276 | $this->connect(); |
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277 | } |
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278 | |
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279 | /* |
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280 | * |
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281 | * |
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282 | * @access public |
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283 | * @param |
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284 | * @return |
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285 | * @author Quinn Comendant <quinn@strangecode.com> |
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286 | * @since 09 Jul 2019 10:05:34 |
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287 | */ |
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288 | public function ping() |
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289 | { |
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290 | $app =& App::getInstance(); |
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291 | |
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292 | if (!$this->_connected) { |
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293 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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294 | } |
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295 | |
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296 | try { |
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297 | $this->dbh->query('SELECT 1'); |
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298 | } catch (\PDOException $e) { |
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299 | return false; |
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300 | } |
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301 | |
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302 | return true; |
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303 | } |
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304 | |
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305 | /* |
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306 | * Die only if db_die_on_failure is true. This will be set to false for some cases |
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307 | * when a database is not required for web app functionality. |
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308 | * |
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309 | * @access public |
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310 | * @param string $msg Print $msg when dying. |
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311 | * @return bool false If we don't die. |
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312 | * @author Quinn Comendant <quinn@strangecode.com> |
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313 | * @version 1.0 |
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314 | * @since 15 Jan 2007 15:59:00 |
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315 | */ |
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316 | protected function _fail() |
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317 | { |
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318 | $app =& App::getInstance(); |
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319 | |
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320 | if ($this->getParam('db_die_on_failure')) { |
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321 | if (!$app->isCLI()) { |
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322 | // For http requests, send a Service Unavailable header. |
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323 | header(' ', true, 503); |
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324 | echo _("This page is temporarily unavailable. Please try again in a few minutes."); |
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325 | } |
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326 | die; |
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327 | } else { |
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328 | return false; |
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329 | } |
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330 | } |
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331 | |
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332 | /** |
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333 | * Returns connection status |
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334 | * |
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335 | * @access public |
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336 | * @author Quinn Comendant <quinn@strangecode.com> |
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337 | * @since 28 Aug 2005 14:58:09 |
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338 | */ |
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339 | public function isConnected() |
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340 | { |
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341 | return (true === $this->_connected); |
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342 | } |
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343 | |
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344 | /* |
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345 | * Return the total number of queries executed thus far. |
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346 | * |
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347 | * @access public |
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348 | * @return int Number of queries |
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349 | * @author Quinn Comendant <quinn@strangecode.com> |
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350 | * @version 1.0 |
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351 | * @since 15 Jun 2006 11:46:05 |
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352 | */ |
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353 | public function numQueries() |
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354 | { |
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355 | return $this->_query_count; |
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356 | } |
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357 | |
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358 | /** |
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359 | * Reset cached items. |
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360 | * |
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361 | * @access public |
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362 | * @author Quinn Comendant <quinn@strangecode.com> |
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363 | * @since 28 Aug 2005 22:10:50 |
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364 | */ |
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365 | public function resetCache() |
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366 | { |
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367 | self::$existing_tables = null; |
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368 | self::$table_columns = []; |
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369 | } |
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370 | |
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371 | /* |
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372 | * |
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373 | * |
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374 | * @access public |
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375 | * @param string $query The SQL query to execute |
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376 | * @param bool $debug If true, prints debugging info |
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377 | * @return resource PDOStatement |
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378 | * @author Quinn Comendant <quinn@strangecode.com> |
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379 | * @since 09 Jul 2019 10:00:00 |
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380 | */ |
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381 | public function query($query, $debug=false) |
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382 | { |
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383 | $app =& App::getInstance(); |
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384 | |
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385 | if (!$this->_connected) { |
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386 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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387 | } |
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388 | |
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389 | $this->_query_count++; |
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390 | |
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391 | $debugqry = preg_replace('/\n[\t ]+/' . $app->getParam('preg_u'), "\n", $query); |
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392 | if ($this->getParam('db_always_debug') || $debug) { |
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393 | if ($debug > 1) { |
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394 | dump($debugqry, true, SC_DUMP_PRINT_R, __FILE__, __LINE__); |
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395 | } else { |
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396 | echo "<!-- ----------------- PDO query $this->_query_count ---------------------\n$debugqry\n-->\n"; |
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397 | } |
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398 | } |
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399 | |
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400 | // Ensure we have an active connection. |
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401 | // If we continue on a dead connection we might experience a "MySQL server has gone away" error. |
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402 | // http://dev.mysql.com/doc/refman/5.0/en/gone-away.html |
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403 | if (!$this->ping()) { |
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404 | $app->logMsg(sprintf('MySQL ping failed; reconnecting⊠("%s")', truncate(trim($debugqry), 150)), LOG_DEBUG, __FILE__, __LINE__); |
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405 | $this->reconnect(); |
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406 | } |
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407 | |
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408 | // Execute! |
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409 | try { |
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410 | $stmt = $this->dbh->query($query); |
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411 | if (!$stmt) { |
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412 | throw new \Exception('PDO::query returned false'); |
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413 | } |
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414 | } catch (\Exception $e) { |
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415 | $app->logMsg(sprintf('PDO query %s (%s): %s in query: %s', get_class($e), $e->getCode(), $e->getMessage(), $debugqry), LOG_EMERG, __FILE__, __LINE__); |
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416 | if ($this->getParam('db_debug') && $app->getParam('display_errors')) { |
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417 | if (!$app->isCLI()) { |
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418 | printf('<pre style="padding:1em;background:#ddd;font:0.9rem monospace;">%s<hr>%s</pre>', wordwrap($e->getMessage()), htmlspecialchars($debugqry)); |
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419 | } |
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420 | } |
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421 | // Die if db_die_on_failure = true, or just continue without connection |
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422 | return $this->_fail(); |
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423 | } |
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424 | |
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425 | return $stmt; |
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426 | } |
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427 | |
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428 | /* |
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429 | * |
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430 | * |
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431 | * @access public |
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432 | * @param |
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433 | * @return |
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434 | * @author Quinn Comendant <quinn@strangecode.com> |
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435 | * @since 09 Jul 2019 19:26:37 |
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436 | */ |
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437 | public function prepare($query, ...$params) |
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438 | { |
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439 | $app =& App::getInstance(); |
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440 | |
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441 | if (!$this->_connected) { |
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442 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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443 | } |
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444 | |
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445 | $this->_query_count++; |
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446 | |
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447 | $debugqry = preg_replace('/\n[\t ]+/' . $app->getParam('preg_u'), "\n", $query); |
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448 | if ($this->getParam('db_always_debug')) { |
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449 | echo "<!-- ----------------- PDO prepare $this->_query_count ---------------------\n$debugqry\n-->\n"; |
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450 | } |
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451 | |
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452 | // Ensure we have an active connection. |
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453 | // If we continue on a dead connection we might experience a "MySQL server has gone away" error. |
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454 | // http://dev.mysql.com/doc/refman/5.0/en/gone-away.html |
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455 | if (!$this->ping()) { |
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456 | $app->logMsg(sprintf('MySQL ping failed; reconnecting⊠("%s")', truncate(trim($debugqry), 150)), LOG_DEBUG, __FILE__, __LINE__); |
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457 | $this->reconnect(); |
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458 | } |
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459 | |
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460 | // Execute! |
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461 | try { |
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462 | $stmt = $this->dbh->prepare($query, ...$params); |
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463 | if (!$stmt) { |
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464 | throw new \Exception('PDO::prepare returned false'); |
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465 | } |
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466 | } catch (\PDOException $e) { |
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467 | $app->logMsg(sprintf('PDO prepare %s (%s): %s in query: %s', get_class($e), $e->getCode(), $e->getMessage(), $debugqry), LOG_EMERG, __FILE__, __LINE__); |
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468 | if ($this->getParam('db_debug') && $app->getParam('display_errors')) { |
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469 | if (!$app->isCLI()) { |
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470 | printf('<pre style="padding:1em;background:#ddd;font:0.9rem monospace;">%s<hr>%s</pre>', wordwrap($e->getMessage()), htmlspecialchars($debugqry)); |
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471 | } |
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472 | } |
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473 | // Die if db_die_on_failure = true, or just continue without connection |
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474 | return $this->_fail(); |
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475 | } |
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476 | |
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477 | return $stmt; |
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478 | } |
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479 | |
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480 | /* |
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481 | * |
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482 | * |
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483 | * @access public |
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484 | * @param |
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485 | * @return |
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486 | * @author Quinn Comendant <quinn@strangecode.com> |
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487 | * @since 09 Jul 2019 19:42:48 |
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488 | */ |
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489 | public function lastInsertId($name=null) |
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490 | { |
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491 | return $this->dbh->lastInsertId($name); |
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492 | } |
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493 | |
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494 | /* |
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495 | * |
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496 | * |
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497 | * @access public |
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498 | * @param |
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499 | * @return |
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500 | * @author Quinn Comendant <quinn@strangecode.com> |
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501 | * @since 09 Jul 2019 18:32:55 |
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502 | */ |
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503 | public function quote(...$params) |
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504 | { |
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505 | return $this->dbh->quote(...$params); |
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506 | } |
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507 | |
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508 | /* |
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509 | * Remove unsafe characters from SQL identifiers (tables, views, indexes, columns, and constraints). |
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510 | * |
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511 | * @access public |
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512 | * @param string $idname Identifier name. |
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513 | * @return string Clean string. |
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514 | * @author Quinn Comendant <quinn@strangecode.com> |
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515 | * @since 09 Jul 2019 18:32:55 |
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516 | */ |
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517 | static function sanitizeIdentifier($idname) |
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518 | { |
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519 | $app =& App::getInstance(); |
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520 | |
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521 | return preg_replace('/\W/' . $app->getParam('preg_u'), '', $idname); |
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522 | } |
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523 | |
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524 | /** |
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525 | * Loads a list of tables in the current database into an array, and returns |
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526 | * true if the requested table is found. Use this function to enable/disable |
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527 | * functionality based upon the current available db tables or to dynamically |
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528 | * create tables if missing. |
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529 | * |
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530 | * @param string $table The name of the table to search. |
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531 | * @param bool $use_cached_results Get fresh table info (in case DB changed). |
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532 | * @return bool true if given $table exists. |
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533 | */ |
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534 | public function tableExists($table, $use_cached_results=true) |
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535 | { |
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536 | $app =& App::getInstance(); |
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537 | |
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538 | if (!$this->_connected) { |
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539 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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540 | } |
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541 | |
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542 | if (null === self::$existing_tables || !$use_cached_results) { |
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543 | $stmt = $this->query('SHOW TABLES'); |
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544 | self::$existing_tables = $stmt->fetchAll(\PDO::FETCH_COLUMN); |
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545 | } |
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546 | |
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547 | if (in_array($table, self::$existing_tables)) { |
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548 | return true; |
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549 | } else { |
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550 | $app->logMsg(sprintf('Nonexistent DB table: %s.%s', $this->getParam('db_name'), $table), LOG_INFO, __FILE__, __LINE__); |
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551 | return false; |
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552 | } |
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553 | } |
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554 | |
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555 | /** |
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556 | * Tests if the given array of columns exists in the specified table. |
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557 | * |
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558 | * @param string $table The name of the table to search. |
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559 | * @param array $columns An array of column names. |
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560 | * @param bool $strict Exact schema match. If TRUE, test if *only* the given columns exist. If FALSE, test if given columns exist (possibly amongst others). |
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561 | * @param bool $use_cached_results Get fresh table info (in case DB changed). |
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562 | * @return bool true if column(s) exist. |
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563 | */ |
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564 | public function columnExists($table, $columns, $strict=true, $use_cached_results=true) |
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565 | { |
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566 | $app =& App::getInstance(); |
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567 | |
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568 | if (!$this->_connected) { |
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569 | throw new \Exception(sprintf('No DB connection to run %s', __METHOD__)); |
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570 | } |
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571 | |
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572 | // Ensure the table exists. |
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573 | if (!$this->tableExists($table, $use_cached_results)) { |
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574 | $app->logMsg(sprintf('Table does not exist: %s', $table), LOG_NOTICE, __FILE__, __LINE__); |
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575 | return false; |
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576 | } |
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577 | |
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578 | // For single-value columns. |
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579 | if (!is_array($columns)) { |
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580 | $columns = array($columns); |
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581 | } |
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582 | |
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583 | if (!isset(self::$table_columns[$table]) || !$use_cached_results) { |
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584 | // Populate and cache array of current columns for this table. |
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585 | $stmt = $this->query(sprintf('DESCRIBE `%s`', $this->sanitizeIdentifier($table))); |
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586 | self::$table_columns[$table] = $stmt->fetchAll(\PDO::FETCH_COLUMN); |
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587 | } |
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588 | |
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589 | if ($strict) { |
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590 | // Do an exact comparison of table schemas. |
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591 | sort($columns); |
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592 | sort(self::$table_columns[$table]); |
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593 | return self::$table_columns[$table] == $columns; |
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594 | } else { |
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595 | // Only check that the specified columns are available in the table. |
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596 | $match_columns = array_intersect(self::$table_columns[$table], $columns); |
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597 | sort($columns); |
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598 | sort($match_columns); |
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599 | return $match_columns == $columns; |
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600 | } |
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601 | } |
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602 | |
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603 | /** |
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604 | * Returns the values of an ENUM or SET column, returning them as an array. |
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605 | * |
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606 | * @param string $db_table database table to lookup |
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607 | * @param string $db_col database column to lookup |
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608 | * @param bool $sort Sort the output. |
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609 | * @return array Array of the set/enum values on success, false on failure. |
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610 | */ |
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611 | public function getEnumValues($db_table, $db_col, $sort=false) |
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612 | { |
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613 | $app =& App::getInstance(); |
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614 | |
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615 | $stmt = $this->query(sprintf("SHOW COLUMNS FROM `%s` LIKE %s", $this->sanitizeIdentifier($db_table), $this->dbh->quote($db_col)), false); |
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616 | $row = $stmt->fetch(\PDO::FETCH_ASSOC); |
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617 | if (isset($row['Type']) && preg_match('/^(?:enum|set)\((.*)\)$/i', $row['Type'], $matches) && isset($matches[1]) && '' != $matches[1]) { |
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618 | $enum = str_getcsv($matches[1], ",", "'"); |
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619 | if ($sort) { |
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620 | natsort($enum); |
---|
621 | } |
---|
622 | return $enum; |
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623 | } else { |
---|
624 | $app->logMsg(sprintf('No set or enum fields found in %s.%s', $db_table, $db_col), LOG_ERR, __FILE__, __LINE__); |
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625 | return false; |
---|
626 | } |
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627 | } |
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628 | } |
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