bundles/dieschittigs/iconic/src/Resources/contao/elements/PrerenderableContentElement.php line 19

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  1. <?php
  3. namespace Contao;
  5. use Jaybizzle\CrawlerDetect\CrawlerDetect;
  6. use Contao\System;
  8. abstract class PrerenderableContentElement extends ContentElement
  9. {
  10. protected $templateMarkerName = '___default___';
  12. public function generate()
  13. {
  14. $this->templateMarkerName = $this->templateMarkerName . $this->id;
  16. $this->queueRendering();
  18. if (!$this->cacheExists() || !$this->isCrawler()) {
  19. return parent::generate();
  20. }
  22. return $this->getMarkedRange($this->loadCache());
  23. }
  25. protected function queueRendering()
  26. {
  27. // Request every time a crawler requests this page
  28. // and one in 20 times a regular user requests it.
  29. if (!$this->isCrawler() && rand(1, 20) !== 5) return;
  31. $urlString = PrerenderFilenameGenerator::getUrlString();
  33. $ch = curl_init();
  34. curl_setopt($ch, CURLOPT_URL, 'http://websnapper.sttgs.de/add/' . urlencode($urlString));
  35. curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  36. curl_setopt($ch, CURLOPT_TIMEOUT_MS, 100);
  37. $res = curl_exec($ch);
  38. curl_close($ch);
  39. }
  41. protected function isCrawler()
  42. {
  43. $detect = new CrawlerDetect;
  45. return $detect->isCrawler();
  46. }
  48. protected function cacheExists()
  49. {
  50. return file_exists(PrerenderFilenameGenerator::getCacheFilename());
  51. }
  53. protected function loadCache()
  54. {
  55. return file_get_contents(PrerenderFilenameGenerator::getCacheFilename());
  56. }
  58. protected function getMarkedRange($string)
  59. {
  60. $start = stripos($string, $this->startMarker());
  61. $end = stripos($string, $this->endMarker());
  63. // If the marked range can't be found, generate anew.
  64. if (!$start || !$end) {
  65. return parent::generate();
  66. }
  68. return substr($string, $start, $end - $start + strlen($this->endMarker()));
  69. }
  71. public function startMarker()
  72. {
  73. return "<!-- MARKER_{$this->templateMarkerName} -->";
  74. }
  76. public function endMarker()
  77. {
  78. return "<!-- ENDMARKER_{$this->templateMarkerName} -->";
  79. }
  81. protected function setupTemplate()
  82. {
  83. $this->Template->startMarker = [$this, 'startMarker'];
  84. $this->Template->endMarker = [$this, 'endMarker'];
  85. }
  86. }