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https://github.com/friendica/friendica
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Merge pull request #8671 from MrPetovan/bug/8623-relative-href
Add support for relative URL in HTML documents
This commit is contained in:
Michael Vogel
GitHub
commit
58f06a830f
2 changed files with 174 additions and 29 deletions
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@ -1756,50 +1756,87 @@ class Probe
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}
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/**
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* Check page for feed link
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* Checks HTML page for RSS feed link
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*
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* @param string $url Page link
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*
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* @return string feed link
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* @param string $url Page link
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* @param string $body Page body string
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* @return string|false Feed link or false if body was invalid HTML document
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*/
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private static function getFeedLink($url)
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public static function getFeedLink(string $url, string $body)
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{
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$curlResult = Network::curl($url);
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if (!$curlResult->isSuccess()) {
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return false;
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}
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$doc = new DOMDocument();
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if (!@$doc->loadHTML($curlResult->getBody())) {
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if (!@$doc->loadHTML($body)) {
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return false;
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}
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$xpath = new DomXPath($doc);
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$xpath = new DOMXPath($doc);
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//$feeds = $xpath->query("/html/head/link[@type='application/rss+xml']");
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$feeds = $xpath->query("/html/head/link[@type='application/rss+xml' and @rel='alternate']");
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if (!is_object($feeds)) {
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return false;
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$feedUrl = $xpath->evaluate('string(/html/head/link[@type="application/rss+xml" and @rel="alternate"]/@href)');
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$feedUrl = $feedUrl ? self::ensureAbsoluteLinkFromHTMLDoc($feedUrl, $url, $xpath) : '';
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return $feedUrl;
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}
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/**
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* Return an absolute URL in the context of a HTML document retrieved from the provided URL.
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*
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* Loosely based on RFC 1808
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*
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* @see https://tools.ietf.org/html/rfc1808
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*
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* @param string $href The potential relative href found in the HTML document
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* @param string $base The HTML document URL
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* @param DOMXPath $xpath The HTML document XPath
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* @return string
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*/
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private static function ensureAbsoluteLinkFromHTMLDoc(string $href, string $base, DOMXPath $xpath)
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{
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if (filter_var($href, FILTER_VALIDATE_URL)) {
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return $href;
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}
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if ($feeds->length == 0) {
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return false;
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}
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$base = $xpath->evaluate('string(/html/head/base/@href)') ?: $base;
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$feed_url = "";
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$baseParts = parse_url($base);
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foreach ($feeds as $feed) {
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$attr = [];
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foreach ($feed->attributes as $attribute) {
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$attr[$attribute->name] = trim($attribute->value);
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// Naked domain case (scheme://basehost)
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$path = $baseParts['path'] ?? '/';
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// Remove the filename part of the path if it exists (/base/path/file)
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$path = implode('/', array_slice(explode('/', $path), 0, -1));
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$hrefParts = parse_url($href);
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// Root path case (/path) including relative scheme case (//host/path)
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if ($hrefParts['path'] && $hrefParts['path'][0] == '/') {
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$path = $hrefParts['path'];
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} else {
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$path = $path . '/' . $hrefParts['path'];
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// Resolve arbitrary relative path
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// Lifted from https://www.php.net/manual/en/function.realpath.php#84012
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$parts = array_filter(explode('/', $path), 'strlen');
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$absolutes = array();
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foreach ($parts as $part) {
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if ('.' == $part) continue;
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if ('..' == $part) {
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array_pop($absolutes);
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} else {
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$absolutes[] = $part;
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}
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}
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if (empty($feed_url) && !empty($attr['href'])) {
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$feed_url = $attr["href"];
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}
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$path = '/' . implode('/', $absolutes);
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}
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return $feed_url;
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// Relative scheme case (//host/path)
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$baseParts['host'] = $hrefParts['host'] ?? $baseParts['host'];
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$baseParts['path'] = $path;
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unset($baseParts['query']);
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unset($baseParts['fragment']);
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return Network::unparseURL($baseParts);
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}
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/**
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@ -1826,7 +1863,7 @@ class Probe
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return false;
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}
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$feed_url = self::getFeedLink($url);
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$feed_url = self::getFeedLink($url, $feed);
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if (!$feed_url) {
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return false;
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108
tests/src/Network/ProbeTest.php
Normal file
108
tests/src/Network/ProbeTest.php
Normal file
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@ -0,0 +1,108 @@
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<?php
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namespace Friendica\Test\src\Network;
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use Friendica\Network\Probe;
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use PHPUnit\Framework\TestCase;
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class ProbeTest extends TestCase
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{
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const TEMPLATENOBASE = '
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<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<title>Example Blog</title>
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<link href="{{$link}}" rel="alternate" type="application/rss+xml" title="Example Blog" />
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<link href="{{$link}}" rel="feed" type="application/rss+xml" title="Example Blog" />
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</head>
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<body>
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<p>Hello World!</p>
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</body>
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</html>';
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const TEMPLATEBASE = '
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<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<title>Example Blog</title>
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<link href="{{$link}}" rel="alternate" type="application/rss+xml" title="Example Blog" />
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<link href="{{$link}}" rel="feed" type="application/rss+xml" title="Example Blog" />
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<base href="{{$url}}">
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</head>
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<body>
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<p>Hello World!</p>
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</body>
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</html>';
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const EXPECTED = [
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'https://example.org/path/to/blog/index.php' => [
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'index.xml' => 'https://example.org/path/to/blog/index.xml',
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'./index.xml' => 'https://example.org/path/to/blog/index.xml',
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'../index.xml' => 'https://example.org/path/to/index.xml',
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'/index.xml' => 'https://example.org/index.xml',
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'//example.com/index.xml' => 'https://example.com/index.xml',
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],
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'https://example.org/path/to/blog/' => [
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'index.xml' => 'https://example.org/path/to/blog/index.xml',
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'./index.xml' => 'https://example.org/path/to/blog/index.xml',
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'../index.xml' => 'https://example.org/path/to/index.xml',
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'/index.xml' => 'https://example.org/index.xml',
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'//example.com/index.xml' => 'https://example.com/index.xml',
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],
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'https://example.org/blog/' => [
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'index.xml' => 'https://example.org/blog/index.xml',
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'./index.xml' => 'https://example.org/blog/index.xml',
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'../index.xml' => 'https://example.org/index.xml',
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'/index.xml' => 'https://example.org/index.xml',
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'//example.com/index.xml' => 'https://example.com/index.xml',
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],
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'https://example.org' => [
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'index.xml' => 'https://example.org/index.xml',
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'./index.xml' => 'https://example.org/index.xml',
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'../index.xml' => 'https://example.org/index.xml',
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'/index.xml' => 'https://example.org/index.xml',
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'//example.com/index.xml' => 'https://example.com/index.xml',
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],
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];
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private function replaceMacros($template, $vars)
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{
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foreach ($vars as $var => $value) {
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$template = str_replace('{{' . $var . '}}', $value, $template);
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}
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return $template;
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}
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/**
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* @small
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*/
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public function testGetFeedLinkNoBase()
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{
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foreach (self::EXPECTED as $url => $hrefs) {
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foreach ($hrefs as $href => $expected) {
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$body = $this->replaceMacros(self::TEMPLATENOBASE, ['$link' => $href]);
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$feedLink = Probe::getFeedLink($url, $body);
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$this->assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
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}
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}
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}
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/**
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* @small
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*/
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public function testGetFeedLinkBase()
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{
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foreach (self::EXPECTED as $url => $hrefs) {
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foreach ($hrefs as $href => $expected) {
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$body = $this->replaceMacros(self::TEMPLATEBASE, ['$url' => $url, '$link' => $href]);
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$feedLink = Probe::getFeedLink('http://example.com', $body);
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$this->assertEquals($expected, $feedLink, 'base url = ' . $url . ' | href = ' . $href);
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}
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}
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}
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}
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