minor symfony#60090 [HtmlSanitizer] reject URLs with URL-encoded non UTF-8 characters in the host part (xabbuh)

This PR was merged into the 6.4 branch.

Discussion
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[HtmlSanitizer] reject URLs with URL-encoded non UTF-8 characters in the host part

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        |
| License       | MIT

following thephpleague/uri-interfaces@40f64d3

Commits
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1f3e0d8 reject URLs with URL-encoded non UTF-8 characters in the host part

Author: nicolas-grekas

src/Symfony/Component/HtmlSanitizer/Tests/TextSanitizer/UrlSanitizerTest.php

@@ -568,8 +568,8 @@ public static function provideParse(): iterable
             'http://你好你好' => ['scheme' => 'http', 'host' => '你好你好'],
             'https://faß.ExAmPlE/' => ['scheme' => 'https', 'host' => 'faß.ExAmPlE'],
             'sc://faß.ExAmPlE/' => ['scheme' => 'sc', 'host' => 'faß.ExAmPlE'],
-            'http://%30%78%63%30%2e%30%32%35%30.01' => ['scheme' => 'http', 'host' => '%30%78%63%30%2e%30%32%35%30.01'],
-            'http://%30%78%63%30%2e%30%32%35%30.01%2e' => ['scheme' => 'http', 'host' => '%30%78%63%30%2e%30%32%35%30.01%2e'],
+            'http://%30%78%63%30%2e%30%32%35%30.01' => null,
+            'http://%30%78%63%30%2e%30%32%35%30.01%2e' => null,
             'http://０Ｘｃ０．０２５０．０１' => ['scheme' => 'http', 'host' => '０Ｘｃ０．０２５０．０１'],
             'http://./' => ['scheme' => 'http', 'host' => '.'],
             'http://../' => ['scheme' => 'http', 'host' => '..'],
@@ -689,7 +689,7 @@ public static function provideParse(): iterable
             'urn:ietf:rfc:2648' => ['scheme' => 'urn', 'host' => null],
             'tag:[email protected],2001:foo/bar' => ['scheme' => 'tag', 'host' => null],
             'non-special://%E2%80%A0/' => ['scheme' => 'non-special', 'host' => '%E2%80%A0'],
-            'non-special://H%4fSt/path' => ['scheme' => 'non-special', 'host' => 'H%4fSt'],
+            'non-special://H%4fSt/path' => null,
             'non-special://[1:2:0:0:5:0:0:0]/' => ['scheme' => 'non-special', 'host' => '[1:2:0:0:5:0:0:0]'],
             'non-special://[1:2:0:0:0:0:0:3]/' => ['scheme' => 'non-special', 'host' => '[1:2:0:0:0:0:0:3]'],
             'non-special://[1:2::3]:80/' => ['scheme' => 'non-special', 'host' => '[1:2::3]'],

src/Symfony/Component/HtmlSanitizer/TextSanitizer/UrlSanitizer.php

@@ -100,6 +100,10 @@ public static function parse(string $url): ?array
                 return null;
             }
 
+            if (isset($parsedUrl['host']) && self::decodeUnreservedCharacters($parsedUrl['host']) !== $parsedUrl['host']) {
+                return null;
+            }
+
             return $parsedUrl;
         } catch (SyntaxError) {
             return null;
@@ -139,4 +143,16 @@ private static function matchAllowedHostParts(array $uriParts, array $trustedPar
 
         return true;
     }
+
+    /**
+     * Implementation borrowed from League\Uri\Encoder::decodeUnreservedCharacters().
+     */
+    private static function decodeUnreservedCharacters(string $host): string
+    {
+        return preg_replace_callback(
+            ',%(2[1-9A-Fa-f]|[3-7][0-9A-Fa-f]|61|62|64|65|66|7[AB]|5F),',
+            static fn (array $matches): string => rawurldecode($matches[0]),
+            $host
+        );
+    }
 }