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<?php
header('Content-type: text/plain; charset=utf-8');
/**
* User: Marvin Borner
* Date: 16/09/2018
* Time: 21:51
*/
require_once 'CrawlController.php';
class Algorithms
{
public static function getUrlInfo($path): array
{
$urlInfo = [];
$urlInfo['title'] = strip_tags($path->query('//title')[0]->textContent);
foreach ($path->query('//html') as $language) {
$urlInfo['language'] = strip_tags($language->getAttribute('lang'));
}
foreach ($path->query('/html/head/meta[@name="description"]') as $description) {
$urlInfo['description'] = strip_tags($description->getAttribute('content'));
}
// Fix empty information
if (!isset($urlInfo['description'])) {
$urlInfo['description'] = '';
foreach ($path->query('//p') as $text) {
if (mb_strlen($urlInfo['description']) < 350) {
$urlInfo['description'] .= $text->textContent . ' ';
}
}
}
if (empty($urlInfo['title'])) {
$urlInfo['title'] = '';
if (mb_strlen($urlInfo['title']) < 350) {
$urlInfo['title'] .= $path->query('//h1')[0]->textContent . ' ';
}
}
print "\t\e[92mFound data: " . $urlInfo['title'] . "\n";
return $urlInfo;
}
public static function getLinks($path): array
{
$allLinks = [];
foreach ($path->query('//a') as $link) {
$linkHref = $link->getAttribute('href');
$href = self::cleanUrl($linkHref);
$allLinks[] = $href;
}
return array_unique($allLinks);
}
public static function createPathFromHtml($content): \DOMXPath
{
$dom = new DOMDocument();
libxml_use_internal_errors(true);
$dom->loadHTML($content);
libxml_use_internal_errors(false);
return new DOMXPath($dom);
}
public static function cleanUrl($url): string
{
$newUrl = self::fixEncoding(ltrim($url)); // trim whitespaces
// normally only for links/href
if (filter_var($newUrl, FILTER_VALIDATE_URL) === false || mb_strpos($newUrl, 'http') !== 0) {
if (mb_strpos($newUrl, 'www') === 0) {
$newUrl = 'http://' . $newUrl; // fixes eg. "www.example.com" by adding http:// at beginning
} else if (mb_strpos($newUrl, 'javascript:') === 0 || mb_strpos($newUrl, 'mailto') === 0) {
$newUrl = CrawlController::$currentlyCrawled; // fixes javascript void links
} else if (mb_strpos($newUrl, '../') === 0) {
$parsedUrl = parse_url(CrawlController::$currentlyCrawled);
$backCount = mb_substr_count($parsedUrl['path'], '../'); // TODO: Better back counter (../../foo/../bar isn't parsed correctly)
if ($backCount >= 1) {
$newUrl = $parsedUrl['scheme'] . '://' . $parsedUrl['host'] . dirname($parsedUrl['path'] ?? '', $backCount) . $newUrl; // fixes eg. "../sub_dir" by going back and adding new path
}
} else if (mb_strpos($newUrl, '/') === 0) {
$parsedUrl = parse_url(CrawlController::$currentlyCrawled);
$newUrl = $parsedUrl['scheme'] . '://' . $parsedUrl['host'] . $newUrl; // fixes eg. "/sub_dir" by removing path and adding new path
} else {
$newUrl = '/' . CrawlController::$currentlyCrawled . $newUrl; // fixes eg. "sub_dir" by adding currently crawled url at beginning
}
}
// if it's pure domain without slash (prevents duplicate domains because of slash)
if (preg_match('/\w+\.\w{2,3}$/', $newUrl)) {
$newUrl .= '/';
}
// strip some things
$newUrl = preg_replace('/([^:])(\/{2,})/', '$1/', $newUrl); // double slashes
$newUrl = self::mb_strtok($newUrl, '?'); // parameters
$newUrl = self::mb_strtok($newUrl, '#'); // hash fragments
if (mb_strpos($newUrl, '/') === 0) {
$newUrl = mb_substr($newUrl, 1); // remove first slash from domain, which could have been added
}
if ($url !== $newUrl) {
print "\t\e[92mChanged " . $url . ' to ' . $newUrl . "\n";
}
return $newUrl;
}
private static function fixEncoding($text): string
{
return iconv(mb_detect_encoding($text, mb_detect_order(), true), 'UTF-8', $text);
}
private static function mb_strtok($str, $delimiters)
{
$pos = 0;
$string = $str;
$token = '';
while ($pos < mb_strlen($string)) {
$char = mb_substr($string, $pos, 1);
$pos++;
if (mb_strpos($delimiters, $char) === FALSE) {
$token .= $char;
} else if ($token !== '') {
return $token;
}
}
if ($token !== '') {
return $token;
}
return false;
}
}
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