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1 | <?php |
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2 | |||
3 | use Elgg\Filesystem\Directory; |
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4 | |||
5 | /** |
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6 | * Elgg RewriteTester. |
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7 | * Test if URL rewriting is working. |
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8 | * |
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9 | * @package Elgg.Core |
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10 | * @subpackage Installer |
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11 | */ |
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12 | class ElggRewriteTester { |
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13 | protected $webserver; |
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14 | protected $serverSupportsRemoteRead; |
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15 | protected $rewriteTestPassed; |
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16 | protected $htaccessIssue; |
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17 | |||
18 | /** |
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19 | * Set the webserver as unknown. |
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20 | */ |
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21 | public function __construct() { |
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22 | $this->webserver = 'unknown'; |
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23 | } |
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24 | |||
25 | /** |
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26 | * Run the rewrite test and return a status array |
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27 | * |
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28 | * @param string $url URL of rewrite test |
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29 | * @param string $path Root directory of Elgg with trailing slash |
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30 | * |
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31 | * @return array |
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32 | */ |
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33 | public function run($url, $path) { |
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34 | |||
35 | $this->webserver = \ElggRewriteTester::guessWebServer(); |
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36 | |||
37 | $this->rewriteTestPassed = $this->runRewriteTest($url); |
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38 | |||
39 | if ($this->rewriteTestPassed == false) { |
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40 | if ($this->webserver == 'apache' || $this->webserver == 'unknown') { |
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41 | if ($this->createHtaccess($url, $path)) { |
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42 | $this->rewriteTestPassed = $this->runRewriteTest($url); |
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43 | } |
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44 | } |
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45 | } |
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46 | |||
47 | return $this->returnStatus($url); |
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48 | } |
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49 | |||
50 | /** |
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51 | * Guess the web server from $_SERVER['SERVER_SOFTWARE'] |
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52 | * |
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53 | * @return string |
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54 | */ |
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55 | public static function guessWebServer() { |
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56 | $serverString = strtolower($_SERVER['SERVER_SOFTWARE']); |
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57 | $possibleServers = ['apache', 'nginx', 'lighttpd', 'iis']; |
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58 | foreach ($possibleServers as $server) { |
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59 | if (strpos($serverString, $server) !== false) { |
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60 | return $server; |
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61 | } |
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62 | } |
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63 | return 'unknown'; |
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64 | } |
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65 | |||
66 | /** |
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67 | * Guess if url contains subdirectory or not. |
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68 | * |
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69 | * @param string $url Rewrite test URL |
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70 | * |
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71 | * @return string|bool Subdirectory string with beginning and trailing slash or false if were unable to determine subdirectory |
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72 | * or pointing at root of domain already |
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73 | */ |
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74 | public function guessSubdirectory($url) { |
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75 | $elements = parse_url($url); |
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76 | if (!$elements || !isset($elements['path'])) { |
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77 | return false; |
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78 | } |
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79 | $subdir = trim(dirname($elements['path']), '/'); |
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80 | if (!$subdir) { |
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81 | return false; |
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82 | } else { |
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83 | return "/$subdir/"; |
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84 | } |
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85 | } |
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86 | |||
87 | /** |
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88 | * Hit the rewrite test URL to determine if the rewrite rules are working |
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89 | * |
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90 | * @param string $url Rewrite test URL |
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91 | * |
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92 | * @return bool |
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93 | */ |
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94 | public function runRewriteTest($url) { |
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95 | $this->serverSupportsRemoteRead = ($this->fetchUrl($url) === \Elgg\Application::REWRITE_TEST_OUTPUT); |
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96 | return $this->serverSupportsRemoteRead; |
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97 | } |
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98 | |||
99 | /** |
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100 | * Check whether the site homepage can be fetched via curl |
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101 | * |
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102 | * @return boolean |
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103 | */ |
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104 | public function runLocalhostAccessTest() { |
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105 | $url = _elgg_services()->config->wwwroot; |
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106 | return (bool) $this->fetchUrl($url); |
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107 | } |
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108 | |||
109 | /** |
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110 | * Fetch a URL |
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111 | * |
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112 | * @param string $url The URL |
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113 | * |
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114 | * @return string Note that empty string may imply failure in fetching or empty response |
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115 | */ |
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116 | private function fetchUrl($url) { |
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117 | $response = ''; |
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118 | |||
119 | if (ini_get('allow_url_fopen')) { |
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120 | $ctx = stream_context_create([ |
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121 | 'http' => [ |
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122 | 'follow_location' => 0, |
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123 | 'timeout' => 5, |
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124 | ], |
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125 | ]); |
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126 | $response = @file_get_contents($url, null, $ctx); |
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127 | } |
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128 | |||
129 | if (!$response && function_exists('curl_init')) { |
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130 | $ch = curl_init(); |
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131 | curl_setopt($ch, CURLOPT_URL, $url); |
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132 | curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); |
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133 | curl_setopt($ch, CURLOPT_TIMEOUT, 5); |
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134 | curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); |
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135 | $response = curl_exec($ch); |
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136 | curl_close($ch); |
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137 | } |
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138 | |||
139 | return (string) $response; |
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140 | } |
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141 | |||
142 | /** |
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143 | * Create Elgg's .htaccess file or confirm that it exists |
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144 | * |
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145 | * @param string $url URL of rewrite test |
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146 | * |
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147 | * @return bool |
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148 | */ |
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149 | public function createHtaccess($url) { |
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150 | $root = Directory\Local::root(); |
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151 | $file = $root->getFile(".htaccess"); |
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152 | if ($file->exists()) { |
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153 | // check that this is the Elgg .htaccess |
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154 | $data = $file->getContents(); |
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155 | if ($data === false) { |
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156 | // don't have permission to read the file |
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157 | $this->htaccessIssue = 'read_permission'; |
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158 | return false; |
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159 | } |
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160 | if (strpos($data, 'Elgg') === false) { |
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161 | $this->htaccessIssue = 'non_elgg_htaccess'; |
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162 | return false; |
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163 | } else { |
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164 | // check if this is an old Elgg htaccess |
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165 | if (strpos($data, 'RewriteRule ^rewrite.php$ install.php') == false) { |
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166 | $this->htaccessIssue = 'old_elgg_htaccess'; |
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167 | return false; |
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168 | } |
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169 | return true; |
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170 | } |
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171 | } |
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172 | |||
173 | if (!is_writable($root->getPath())) { |
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174 | $this->htaccessIssue = 'write_permission'; |
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175 | return false; |
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176 | } |
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177 | |||
178 | // create the .htaccess file |
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179 | $result = copy(\Elgg\Application::elggDir()->getPath("install/config/htaccess.dist"), $file->getPath()); |
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180 | if (!$result) { |
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181 | $this->htaccessIssue = 'cannot_copy'; |
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182 | return false; |
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183 | } |
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184 | |||
185 | // does default RewriteBase work already? |
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186 | if (!$this->runRewriteTest($url)) { |
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187 | //try to rewrite to guessed subdirectory |
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188 | if ($subdir = $this->guessSubdirectory($url)) { |
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189 | $contents = $file->getContents(); |
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190 | $contents = preg_replace("/#RewriteBase \/(\r?\n)/", "RewriteBase $subdir\$1", $contents); |
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191 | if ($contents) { |
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192 | $file->putContents($contents); |
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193 | } |
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194 | } |
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195 | } |
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196 | |||
197 | return true; |
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198 | } |
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199 | |||
200 | /** |
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201 | * Create the status array required by the ElggInstaller |
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202 | * |
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203 | * @param string $url Rewrite test URL |
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204 | * |
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205 | * @return array |
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206 | */ |
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207 | protected function returnStatus($url) { |
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208 | if ($this->rewriteTestPassed) { |
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209 | return [ |
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210 | 'severity' => 'pass', |
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211 | 'message' => _elgg_services()->translator->translate('install:check:rewrite:success'), |
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212 | ]; |
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213 | } |
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214 | |||
215 | if ($this->serverSupportsRemoteRead == false) { |
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216 | $msg = _elgg_services()->translator->translate('install:warning:rewrite:unknown', [$url]); |
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217 | $msg .= elgg_view('install/js_rewrite_check', ['url' => $url]); |
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218 | |||
219 | return [ |
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220 | 'severity' => 'warning', |
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221 | 'message' => $msg, |
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222 | ]; |
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223 | } |
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224 | |||
225 | if ($this->webserver == 'apache') { |
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226 | $serverString = _elgg_services()->translator->translate('install:error:rewrite:apache'); |
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227 | $msg = "$serverString\n\n"; |
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228 | if (!isset($this->htaccessIssue)) { |
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229 | $msg .= _elgg_services()->translator->translate('install:error:rewrite:allowoverride'); |
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230 | $msg .= elgg_view('install/js_rewrite_check', ['url' => $url]); |
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231 | |||
232 | return [ |
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233 | 'severity' => 'warning', |
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234 | 'message' => $msg, |
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235 | ]; |
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236 | } |
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237 | $msg .= _elgg_services()->translator->translate("install:error:rewrite:htaccess:{$this->htaccessIssue}"); |
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238 | return [ |
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239 | 'severity' => 'warning', |
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240 | 'message' => $msg, |
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241 | ]; |
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242 | } |
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243 | |||
244 | if ($this->webserver != 'unknown') { |
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245 | $serverString = _elgg_services()->translator->translate("install:error:rewrite:{$this->webserver}"); |
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246 | $msg = "$serverString\n\n"; |
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247 | $msg .= _elgg_services()->translator->translate("install:error:rewrite:altserver"); |
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248 | return [ |
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249 | 'severity' => 'warning', |
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250 | 'message' => $msg, |
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251 | ]; |
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252 | } |
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253 | |||
254 | return [ |
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255 | 'severity' => 'warning', |
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256 | 'message' => _elgg_services()->translator->translate('install:error:rewrite:unknown'), |
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257 | ]; |
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258 | } |
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259 | } |
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260 |
Let’s assume that you have a directory layout like this:
and let’s assume the following content of
Bar.php
:If both files
OtherDir/Foo.php
andSomeDir/Foo.php
are loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.php
However, as
OtherDir/Foo.php
does not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php
, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: