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Add new Network\Probe::ensureAbsoluteLinkFromHTMLDoc method

- Add supports for relative URL in href attributes to probe feed URL
tags/2020.07
Hypolite Petovan 4 months ago
parent
commit
3ef987e4e1
1 changed files with 58 additions and 16 deletions
  1. +58
    -16
      src/Network/Probe.php

+ 58
- 16
src/Network/Probe.php View File

@@ -1771,30 +1771,72 @@ class Probe

$xpath = new DOMXPath($doc);

//$feeds = $xpath->query("/html/head/link[@type='application/rss+xml']");
$feeds = $xpath->query("/html/head/link[@type='application/rss+xml' and @rel='alternate']");
if (!is_object($feeds)) {
return false;
}
$feedUrl = $xpath->evaluate('string(/html/head/link[@type="application/rss+xml" and @rel="alternate"]/@href)');

if ($feeds->length == 0) {
return false;
$feedUrl = $feedUrl ? self::ensureAbsoluteLinkFromHTMLDoc($feedUrl, $url, $xpath) : '';

return $feedUrl;
}

/**
* Return an absolute URL in the context of a HTML document retrieved from the provided URL.
*
* Loosely based on RFC 1808
*
* @see https://tools.ietf.org/html/rfc1808
*
* @param string $href The potential relative href found in the HTML document
* @param string $base The HTML document URL
* @param DOMXPath $xpath The HTML document XPath
* @return string
*/
private static function ensureAbsoluteLinkFromHTMLDoc(string $href, string $base, DOMXPath $xpath)
{
if (filter_var($href, FILTER_VALIDATE_URL, FILTER_FLAG_SCHEME_REQUIRED | FILTER_FLAG_HOST_REQUIRED)) {
return $href;
}

$feed_url = "";
$base = $xpath->evaluate('string(/html/head/base/@href)') ?: $base;

foreach ($feeds as $feed) {
$attr = [];
foreach ($feed->attributes as $attribute) {
$attr[$attribute->name] = trim($attribute->value);
}
$baseParts = parse_url($base);

// Naked domain case (scheme://basehost)
$path = $baseParts['path'] ?? '/';

// Remove the filename part of the path if it exists (/base/path/file)
$path = implode('/', array_slice(explode('/', $path), 0, -1));

if (empty($feed_url) && !empty($attr['href'])) {
$feed_url = $attr["href"];
$hrefParts = parse_url($href);

// Root path case (/path) including relative scheme case (//host/path)
if ($hrefParts['path'] && $hrefParts['path'][0] == '/') {
$path = $hrefParts['path'];
} else {
$path = $path . '/' . $hrefParts['path'];

// Resolve arbitrary relative path
// Lifted from https://www.php.net/manual/en/function.realpath.php#84012
$parts = array_filter(explode('/', $path), 'strlen');
$absolutes = array();
foreach ($parts as $part) {
if ('.' == $part) continue;
if ('..' == $part) {
array_pop($absolutes);
} else {
$absolutes[] = $part;
}
}

$path = '/' . implode('/', $absolutes);
}

return $feed_url;
// Relative scheme case (//host/path)
$baseParts['host'] = $hrefParts['host'] ?? $baseParts['host'];
$baseParts['path'] = $path;
unset($baseParts['query']);
unset($baseParts['fragment']);

return Network::unparseURL($baseParts);
}

/**


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