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<?php
declare(strict_types=1);
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Extension\Autolink;
use League\CommonMark\Extension\CommonMark\Node\Inline\Link;
use League\CommonMark\Parser\Inline\InlineParserInterface;
use League\CommonMark\Parser\Inline\InlineParserMatch;
use League\CommonMark\Parser\InlineParserContext;
final class UrlAutolinkParser implements InlineParserInterface
{
private const ALLOWED_AFTER = [null, ' ', "\t", "\n", "\x0b", "\x0c", "\x0d", '*', '_', '~', '('];
// RegEx adapted from https://github.com/symfony/symfony/blob/4.2/src/Symfony/Component/Validator/Constraints/UrlValidator.php
private const REGEX = '~
(
# Must start with a supported scheme + auth, or "www"
(?:
(?:%s):// # protocol
(?:([\.\pL\pN-]+:)?([\.\pL\pN-]+)@)? # basic auth
|www\.)
(?:
(?:[\pL\pN\pS\-\.])+(?:\.?(?:[\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
| # or
\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} # an IP address
| # or
\[
(?:(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){6})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:::(?:(?:(?:[0-9a-f]{1,4})):){5})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){4})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,1}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){3})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,2}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){2})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,3}(?:(?:[0-9a-f]{1,4})))?::(?:(?:[0-9a-f]{1,4})):)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,4}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,5}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,6}(?:(?:[0-9a-f]{1,4})))?::))))
\] # an IPv6 address
)
(?::[0-9]+)? # a port (optional)
(?:/ (?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%%[0-9A-Fa-f]{2})* )* # a path
(?:\? (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )? # a query (optional)
(?:\# (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )? # a fragment (optional)
)~ixu';
/**
* @var string[]
*
* @psalm-readonly
*/
private array $prefixes = ['www'];
/** @psalm-readonly */
private string $finalRegex;
/**
* @param array<int, string> $allowedProtocols
*/
public function __construct(array $allowedProtocols = ['http', 'https', 'ftp'])
{
$this->finalRegex = \sprintf(self::REGEX, \implode('|', $allowedProtocols));
foreach ($allowedProtocols as $protocol) {
$this->prefixes[] = $protocol . '://';
}
}
public function getMatchDefinition(): InlineParserMatch
{
return InlineParserMatch::oneOf(...$this->prefixes);
}
public function parse(InlineParserContext $inlineContext): bool
{
$cursor = $inlineContext->getCursor();
// Autolinks can only come at the beginning of a line, after whitespace, or certain delimiting characters
$previousChar = $cursor->peek(-1);
if (! \in_array($previousChar, self::ALLOWED_AFTER, true)) {
return false;
}
// Check if we have a valid URL
if (! \preg_match($this->finalRegex, $cursor->getRemainder(), $matches)) {
return false;
}
$url = $matches[0];
// Does the URL end with punctuation that should be stripped?
if (\preg_match('/(.+)([?!.,:*_~]+)$/', $url, $matches)) {
// Add the punctuation later
$url = $matches[1];
}
// Does the URL end with something that looks like an entity reference?
if (\preg_match('/(.+)(&[A-Za-z0-9]+;)$/', $url, $matches)) {
$url = $matches[1];
}
// Does the URL need unmatched parens chopped off?
if (\substr($url, -1) === ')' && ($diff = self::diffParens($url)) > 0) {
$url = \substr($url, 0, -$diff);
}
$cursor->advanceBy(\mb_strlen($url));
// Auto-prefix 'http://' onto 'www' URLs
if (\substr($url, 0, 4) === 'www.') {
$inlineContext->getContainer()->appendChild(new Link('http://' . $url, $url));
return true;
}
$inlineContext->getContainer()->appendChild(new Link($url, $url));
return true;
}
/**
* @psalm-pure
*/
private static function diffParens(string $content): int
{
// Scan the entire autolink for the total number of parentheses.
// If there is a greater number of closing parentheses than opening ones,
// we don’t consider ANY of the last characters as part of the autolink,
// in order to facilitate including an autolink inside a parenthesis.
\preg_match_all('/[()]/', $content, $matches);
$charCount = ['(' => 0, ')' => 0];
foreach ($matches[0] as $char) {
$charCount[$char]++;
}
return $charCount[')'] - $charCount['('];
}
}