private static function setCookieJar()
{
// Create the file
$cj = tempnam("/tmp", "cj");
$fh = fopen($cj, "w+");
fclose($fh);
// Save the cookiejar file
self::$cookiejar = $cj;
// Validate the cookiejar
if (!file_exists($cj)) {
die("Could not create cookiejar file.");
}
if (!is_readable($cj)) {
die("Cannot read cookiejar file.");
}
if (!is_writable($cj)) {
die("Cannot write to cookiejar file.");
}
return;
}
public function crawl($max_depth = 0, $current_depth = 0)
{
// Begin the loop through each URL row
foreach ($this->queue as $k => $page) {
// Make sure it's a crawlable format
$ctype = CrawlerRequest::getContentType($page['url']);
if (strpos($ctype, "text/") === false) {
$bn = array_pop(explode("/", $page['url']));
$this->addOutput("Skipping {$bn} - ({$ctype}).");
// Update the record for the page we just crawled
CrawlerPDO::updateRow(array("title" => $page['title'], "url" => $page['url'], "body" => "skipped", "depth" => CrawlerPDO::getDepthOfUrl($page['url']), "crawled" => 1));
continue;
}
// Get the depth of the current item
$depth = CrawlerPDO::getDepthOfUrl($page['url']);
// Get the page body
$body = CrawlerRequest::request($page['url']);
// Get an new instance of our HTML parser
$parser = new CrawlerParser($body, $page['url']);
// Add images to database
$images = $parser->getImages();
CrawlerPDO::addImages($images, $page['url']);
// Download images if configured
if ($this->config['SAVE_IMAGES'] === true) {
foreach ($images as $image) {
// Check download size
if (!empty($this->config['MIN_IMAGE_SIZE'])) {
$size = CrawlerRequest::getFileSize($image);
if ($size < $this->config['MIN_IMAGE_SIZE']) {
continue;
}
}
$ctype = CrawlerRequest::getContentType($image);
// skip files that don't have explicit contetn type
if (strpos($ctype, "image/") === false) {
continue;
}
// get extention
$ext = explode("/", $ctype);
$ext = $ext[1];
// save the file
$fn = preg_replace("/[^A-Za-z0-9 ]/", '', $image);
$filename = realpath(dirname(__FILE__)) . "/media/cj_{$fn}.{$ext}";
// Get the image if we don't already have it
if (!file_exists($filename)) {
CrawlerRequest::request($image, $params = array(), $filename);
}
}
}
/* Crawl result contains two things we need...
* - 1) Info needed to update the current $page in the $queue, and
* - 2) A new list of links
* Each of the new links will be checked to see if they exist in
* the table yet, if they do they will be updated with referrer
* information, etc. If the new link doesn't exist it will be added
* to the table to be crawled next time the queue is updated.
*/
$crawlResult = array("body" => $parser->getPlaintext(), "links" => $parser->getLinks(), "depth" => $depth + 1);
// Loop thru and check and update or insert each new link
foreach ($crawlResult['links'] as $link) {
// If the URL was already discovered
if (CrawlerPDO::URLDiscovered($link['url'])) {
CrawlerPDO::updateRow(array("title" => $link['title'], "url" => $link['url'], "linked_from" => CrawlerPDO::getURLID($page['url']), "depth" => $crawlResult['depth']));
} else {
CrawlerPDO::insertRow(array("url" => $link['url'], "title" => $link['title'], "linked_from" => CrawlerPDO::getURLID($page['url']), "depth" => $crawlResult['depth']));
}
}
// Update the record for the page we just crawled
CrawlerPDO::updateRow(array("title" => $page['title'], "url" => $page['url'], "body" => $crawlResult['body'], "depth" => $depth, "crawled" => 1));
// Add some output
$this->addOutput("Found " . count($crawlResult['links']) . " links on {$page['url']}.");
// pop this item off the queue
unset($this->queue[$k]);
}
// Queue is empty!
// Incremenent the depth counter
$current_depth++;
if (time() > $this->started + $this->timelimit && $this->timelimit > 0) {
$this->addOutput("Ran for " . (time() - $this->started) . " seconds, timeout set to " . $this->timelimit . ".");
return;
}
// Refresh the queue and keep going?
if ($max_depth == 0 || $max_depth > $current_depth) {
$this->queue = CrawlerPDO::getNextURLs();
if (!empty($this->queue)) {
$this->crawl($max_depth, $current_depth);
}
}
}
