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<?php
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// The file has JSON type.
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header('Content-Type: application/json');
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// Prepare the file name from the query string.
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if (!preg_match("#^[a-zA-Z0-9_]+$#", $_GET['file'])) {
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    die;
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}
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$file = "../tmp/pb_" . $_GET['file'] . ".txt";
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// Make sure the file is exist.
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if (file_exists($file)) {
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  // Get the content and echo it.
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  $text = file_get_contents($file);
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  echo $text;
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// Convert to JSON to read the status.
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  $obj = json_decode($text);
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// If the process is finished, delete the file.
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  if ($obj->percent == 100) {
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    @unlink($file);
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  }
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}
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else {
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  echo json_encode(array("percent" => null, "message" => "File Not Found"));
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}