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      1 <?php
      2 require_once 'portabilityLayer.php';
      3 
      4 // This script acts as a stateful proxy for retrieving files. When the state is set to
      5 // offline, it simulates a network error with a nonsense response.
      6 
      7 if (!sys_get_temp_dir()) {
      8     echo "FAIL: No temp dir was returned.\n";
      9     exit();
     10 }
     11 
     12 function setState($newState, $file)
     13 {
     14     file_put_contents($file, $newState);
     15 }
     16 
     17 function getState($file)
     18 {
     19     if (!file_exists($file)) {
     20         return "Uninitialized";
     21     }
     22     return file_get_contents($file);
     23 }
     24 
     25 function contentType($path)
     26 {
     27     if (preg_match("/\.html$/", $path))
     28         return "text/html";
     29     if (preg_match("/\.manifest$/", $path))
     30         return "text/cache-manifest";
     31     if (preg_match("/\.js$/", $path))
     32         return "text/javascript";
     33     if (preg_match("/\.xml$/", $path))
     34         return "application/xml";
     35     if (preg_match("/\.xhtml$/", $path))
     36         return "application/xhtml+xml";
     37     if (preg_match("/\.svg$/", $path))
     38         return "application/svg+xml";
     39     if (preg_match("/\.xsl$/", $path))
     40         return "application/xslt+xml";
     41     if (preg_match("/\.gif$/", $path))
     42         return "image/gif";
     43     if (preg_match("/\.jpg$/", $path))
     44         return "image/jpeg";
     45     if (preg_match("/\.png$/", $path))
     46         return "image/png";
     47     return "text/plain";
     48 }
     49 
     50 function generateNoCacheHTTPHeader()
     51 {
     52     header("Expires: Thu, 01 Dec 2003 16:00:00 GMT");
     53     header("Cache-Control: no-cache, no-store, must-revalidate");
     54     header("Pragma: no-cache");
     55 }
     56 
     57 function generateResponse($path)
     58 {
     59     global $stateFile;
     60     $state = getState($stateFile);
     61     if ($state == "Offline") {
     62         # Simulate a network error by replying with a nonsense response.
     63         header('HTTP/1.1 307 Temporary Redirect');
     64         header('Location: ' . $_SERVER['REQUEST_URI']); # Redirect to self.
     65         header('Content-Length: 1');
     66         header('Content-Length: 5', false); # Multiple content-length headers, some network stacks can detect this condition faster.
     67         echo "Intentionally incorrect response.";
     68     } else {
     69         // A little securuty checking can't hurt.
     70         if (strstr($path, ".."))
     71             exit;
     72 
     73         if ($path[0] == '/')
     74             $path = '..' . $path;
     75 
     76         generateNoCacheHTTPHeader();
     77 
     78         if (file_exists($path)) {
     79             header("Last-Modified: " . gmdate("D, d M Y H:i:s T", filemtime($path)));
     80             header("Content-Type: " . contentType($path));
     81 
     82             print file_get_contents($path);
     83         } else {
     84             header('HTTP/1.1 404 Not Found');
     85         }
     86     }
     87 }
     88 
     89 function handleIncreaseResourceCountCommand($path)
     90 {
     91     $resourceCountFile = sys_get_temp_dir() . "/resource-count";
     92     $resourceCount = getState($resourceCountFile);
     93     $pieces = explode(" ", $resourceCount);
     94     $count = 0;
     95     if (count($pieces) == 2 && $pieces[0] == $path) {
     96         $count = 1 + $pieces[1];
     97     } else {
     98         $count = 1;
     99     }
    100     file_put_contents($resourceCountFile, $path . " " . $count);
    101     generateResponse($path);
    102 }
    103 
    104 function handleResetResourceCountCommand()
    105 {
    106     $resourceCountFile = sys_get_temp_dir() . "/resource-count";
    107     file_put_contents($resourceCountFile, 0);
    108     generateNoCacheHTTPHeader();
    109     header('HTTP/1.1 200 OK');
    110 }
    111 
    112 function handleGetResourceCountCommand($path)
    113 {
    114     $resourceCountFile = sys_get_temp_dir() . "/resource-count";
    115     $resourceCount = getState($resourceCountFile);
    116     $pieces = explode(" ", $resourceCount);
    117     generateNoCacheHTTPHeader();
    118     header('HTTP/1.1 200 OK');
    119     if (count($pieces) == 2 && $pieces[0] == $path) {
    120         echo $pieces[1];
    121     } else {
    122         echo 0;
    123     }
    124 }
    125 
    126 function handleStartResourceRequestsLog()
    127 {
    128     $resourceLogFile = sys_get_temp_dir() . "/resource-log";
    129     file_put_contents($resourceLogFile,  "");
    130 }
    131 
    132 function handleClearResourceRequestsLog()
    133 {
    134     $resourceLogFile = sys_get_temp_dir() . "/resource-log";
    135     file_put_contents($resourceLogFile, "");
    136 }
    137 
    138 function handleGetResourceRequestsLog()
    139 {
    140     $resourceLogFile = sys_get_temp_dir() . "/resource-log";
    141 
    142     generateNoCacheHTTPHeader();
    143     header("Content-Type: text/plain");
    144 
    145     print file_get_contents($resourceLogFile);
    146 }
    147 
    148 function handleLogResourceRequest($path)
    149 {
    150     $resourceLogFile = sys_get_temp_dir() . "/resource-log";
    151 
    152     $newData = "\n".$path;
    153     // Documentation says that appends are atomic.
    154     file_put_contents($resourceLogFile, $newData, FILE_APPEND);
    155     generateResponse($path);
    156 }
    157 
    158 $stateFile = sys_get_temp_dir() . "/network-simulator-state";
    159 $command = $_GET['command'];
    160 if ($command) {
    161     if ($command == "connect")
    162         setState("Online", $stateFile);
    163     else if ($command == "disconnect")
    164         setState("Offline", $stateFile);
    165     else if ($command == "increase-resource-count")
    166         handleIncreaseResourceCountCommand($_GET['path']);
    167     else if ($command == "reset-resource-count")
    168         handleResetResourceCountCommand();
    169     else if ($command == "get-resource-count")
    170         handleGetResourceCountCommand($_GET['path']);
    171     else if ($command == "start-resource-request-log")
    172         handleStartResourceRequestsLog();
    173     else if ($command == "clear-resource-request-log")
    174         handleClearResourceRequestsLog();
    175     else if ($command == "get-resource-request-log")
    176         handleGetResourceRequestsLog();
    177     else if ($command == "log-resource-request")
    178         handleLogResourceRequest($_GET['path']);
    179     else
    180         echo "Unknown command: " . $command . "\n";
    181     exit();
    182 }
    183 
    184 $requestedPath = $_GET['path'];
    185 generateResponse($requestedPath);
    186 ?>
    187