Replace deprecated use of "self" in callables

[friendica.git] / src / Content / Text / HTML.php

diff --git a/src/Content/Text/HTML.php b/src/Content/Text/HTML.php
index fa5a0a590535ae56bd49260f5ab23bc3bf2807c7..f9f340135cf51cf22cab2bf62c941166305b2f4c 100644 (file)
--- a/src/Content/Text/HTML.php
+++ b/src/Content/Text/HTML.php
@@ -1,6 +1,6 @@
 <?php
 /**
- * @copyright Copyright (C) 2010-2022, the Friendica project
+ * @copyright Copyright (C) 2010-2023, the Friendica project
  *
  * @license GNU AGPL version 3 or any later version
  *
@@ -23,6 +23,7 @@ namespace Friendica\Content\Text;
 
 use DOMDocument;
 use DOMXPath;
+use Friendica\Protocol\HTTP\MediaType;
 use Friendica\Content\Widget\ContactBlock;
 use Friendica\Core\Hook;
 use Friendica\Core\Renderer;
@@ -33,6 +34,7 @@ use Friendica\Util\Network;
 use Friendica\Util\Strings;
 use Friendica\Util\XML;
 use League\HTMLToMarkdown\HtmlConverter;
+use Psr\Http\Message\UriInterface;
 
 class HTML
 {
@@ -1007,4 +1009,77 @@ class HTML
 
                return $text;
        }
+
+       /**
+        * XPath arbitrary string quoting
+        *
+        * @see https://stackoverflow.com/a/45228168
+        * @param string $value
+        * @return string
+        */
+       public static function xpathQuote(string $value): string
+       {
+               if (false === strpos($value, '"')) {
+                       return '"' . $value . '"';
+               }
+
+               if (false === strpos($value, "'")) {
+                       return "'" . $value . "'";
+               }
+
+               // if the value contains both single and double quotes, construct an
+               // expression that concatenates all non-double-quote substrings with
+               // the quotes, e.g.:
+               //
+               //    concat("'foo'", '"', "bar")
+               return 'concat(' . implode(', \'"\', ', array_map([self::class, 'xpathQuote'], explode('"', $value))) . ')';
+       }
+
+       /**
+        * Checks if the provided URL is present in the DOM document in an element with the rel="me" attribute
+        *
+        * XHTML Friends Network http://gmpg.org/xfn/
+        *
+        * @param DOMDocument  $doc
+        * @param UriInterface $meUrl
+        * @return bool
+        */
+       public static function checkRelMeLink(DOMDocument $doc, UriInterface $meUrl): bool
+       {
+               $xpath = new \DOMXpath($doc);
+
+               // This expression checks that "me" is among the space-delimited values of the "rel" attribute.
+               // And that the href attribute contains exactly the provided URL
+               $expression = "//*[contains(concat(' ', normalize-space(@rel), ' '), ' me ')][@href = " . self::xpathQuote($meUrl) . "]";
+
+               $result = $xpath->query($expression);
+
+               return $result !== false && $result->length > 0;
+       }
+
+       /**
+        * @param DOMDocument $doc
+        * @return string|null Lowercase charset
+        */
+       public static function extractCharset(DOMDocument $doc): ?string
+       {
+               $xpath = new DOMXPath($doc);
+
+               $expression = "string(//meta[@charset]/@charset)";
+               if ($charset = $xpath->evaluate($expression)) {
+                       return strtolower($charset);
+               }
+
+               try {
+                       // This expression looks for a meta tag with the http-equiv attribute set to "content-type" ignoring case
+                       // whose content attribute contains a "charset" string and returns its value
+                       $expression = "string(//meta[@http-equiv][translate(@http-equiv, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz') = 'content-type'][contains(translate(@content, 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'), 'charset')]/@content)";
+                       $mediaType = MediaType::fromContentType($xpath->evaluate($expression));
+                       if (isset($mediaType->parameters['charset'])) {
+                               return strtolower($mediaType->parameters['charset']);
+                       }
+               } catch(\InvalidArgumentException $e) {}
+
+               return null;
+       }
 }