gnu-social/components/Link/Link.php

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<?php
// {{{ License
// This file is part of GNU social - https://www.gnu.org/software/social
//
// GNU social is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GNU social is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
// }}}
namespace Component\Link;
use App\Core\DB\DB;
use App\Core\Event;
use App\Core\Modules\Component;
use App\Entity;
use App\Entity\NoteToLink;
use App\Util\Common;
use App\Util\HTML;
use InvalidArgumentException;
class Link extends Component
{
/**
* Extract URLs from $content and create the appropriate Link and NoteToLink entities
*/
public function onProcessNoteContent(int $note_id, string $content)
{
if (Common::config('attachments', 'process_links')) {
$matched_urls = [];
preg_match($this->getURLRegex(), $content, $matched_urls);
$matched_urls = array_unique($matched_urls);
foreach ($matched_urls as $match) {
try {
$link_id = Entity\Link::getOrCreate($match)->getId();
DB::persist(NoteToLink::create(['link_id' => $link_id, 'note_id' => $note_id]));
} catch (InvalidArgumentException) {
continue;
}
}
}
return Event::next;
}
public function onRenderContent(string &$text)
{
$text = $this->replaceURLs($text);
}
public function getURLRegex(): string
{
$geouri_labeltext_regex = '\pN\pL\-';
$geouri_mark_regex = '\-\_\.\!\~\*\\\'\(\)'; // the \\\' is really pretty
$geouri_unreserved_regex = '\pN\pL' . $geouri_mark_regex;
$geouri_punreserved_regex = '\[\]\:\&\+\$';
$geouri_pctencoded_regex = '(?:\%[0-9a-fA-F][0-9a-fA-F])';
$geouri_paramchar_regex = $geouri_unreserved_regex . $geouri_punreserved_regex; //FIXME: add $geouri_pctencoded_regex here so it works
return '#' .
'(?:^|[\s\<\>\(\)\[\]\{\}\\\'\\\";]+)(?![\@\!\#])' .
'(' .
'(?:' .
'(?:' . //Known protocols
'(?:' .
'(?:(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_COLON_DOUBLE_SLASH)) . ')://)' .
'|' .
'(?:(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_SINGLE_COLON)) . '):)' .
')' .
'(?:[\pN\pL\-\_\+\%\~]+(?::[\pN\pL\-\_\+\%\~]+)?\@)?' . //user:pass@
'(?:' .
'(?:' .
'\[[\pN\pL\-\_\:\.]+(?<![\.\:])\]' . //[dns]
')|(?:' .
'[\pN\pL\-\_\:\.]+(?<![\.\:])' . //dns
')' .
')' .
')' .
'|(?:' .
'(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_COLON_COORDINATES)) . '):' .
// There's an order that must be followed here too, if ;crs= is used, it must precede ;u=
// Also 'crsp' (;crs=$crsp) must match $geouri_labeltext_regex
// Also 'uval' (;u=$uval) must be a pnum: \-?[0-9]+
'(?:' .
'(?:[0-9]+(?:\.[0-9]+)?(?:\,[0-9]+(?:\.[0-9]+)?){1,2})' . // 1(.23)?(,4(.56)){1,2}
'(?:\;(?:[' . $geouri_labeltext_regex . ']+)(?:\=[' . $geouri_paramchar_regex . ']+)*)*' .
')' .
')' .
// URLs without domain name, like magnet:?xt=...
'|(?:(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_NO_DOMAIN)) . '):(?=\?))' . // zero-length lookahead requires ? after :
(Common::config('linkify', 'ipv4') // Convert IPv4 addresses to hyperlinks
? '|(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)'
: '') .
(Common::config('linkify', 'ipv6') // Convert IPv6 addresses to hyperlinks
? '|(?:' . //IPv6
'\[?(?:(?:(?:[0-9A-Fa-f]{1,4}:){7}(?:(?:[0-9A-Fa-f]{1,4})|:))|(?:(?:[0-9A-Fa-f]{1,4}:){6}(?::|(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})|(?::[0-9A-Fa-f]{1,4})))|(?:(?:[0-9A-Fa-f]{1,4}:){5}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:){4}(?::[0-9A-Fa-f]{1,4}){0,1}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:){3}(?::[0-9A-Fa-f]{1,4}){0,2}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:){2}(?::[0-9A-Fa-f]{1,4}){0,3}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:)(?::[0-9A-Fa-f]{1,4}){0,4}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?::(?::[0-9A-Fa-f]{1,4}){0,5}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})))\]?(?<!:)' .
')'
: '') .
(Common::config('linkify', 'bare_domains')
? '|(?:' . //DNS
'(?:[\pN\pL\-\_\+\%\~]+(?:\:[\pN\pL\-\_\+\%\~]+)?\@)?' . //user:pass@
'[\pN\pL\-\_]+(?:\.[\pN\pL\-\_]+)*\.' .
//tld list from http://data.iana.org/TLD/tlds-alpha-by-domain.txt, also added local, loc, and onion
'(?:AC|AD|AE|AERO|AF|AG|AI|AL|AM|AN|AO|AQ|AR|ARPA|AS|ASIA|AT|AU|AW|AX|AZ|BA|BB|BD|BE|BF|BG|BH|BI|BIZ|BJ|BM|BN|BO|BR|BS|BT|BV|BW|BY|BZ|CA|CAT|CC|CD|CF|CG|CH|CI|CK|CL|CM|CN|CO|COM|COOP|CR|CU|CV|CX|CY|CZ|DE|DJ|DK|DM|DO|DZ|EC|EDU|EE|EG|ER|ES|ET|EU|FI|FJ|FK|FM|FO|FR|GA|GB|GD|GE|GF|GG|GH|GI|GL|GM|GN|GOV|GP|GQ|GR|GS|GT|GU|GW|GY|HK|HM|HN|HR|HT|HU|ID|IE|IL|IM|IN|INFO|INT|IO|IQ|IR|IS|IT|JE|JM|JO|JOBS|JP|KE|KG|KH|KI|KM|KN|KP|KR|KW|KY|KZ|LA|LB|LC|LI|LK|LR|LS|LT|LU|LV|LY|MA|MC|MD|ME|MG|MH|MIL|MK|ML|MM|MN|MO|MOBI|MP|MQ|MR|MS|MT|MU|MUSEUM|MV|MW|MX|MY|MZ|NA|NAME|NC|NE|NET|NF|NG|NI|NL|NO|NP|NR|NU|NZ|OM|ORG|PA|PE|PF|PG|PH|PK|PL|PM|PN|PR|PRO|PS|PT|PW|PY|QA|RE|RO|RS|RU|RW|SA|SB|SC|SD|SE|SG|SH|SI|SJ|SK|SL|SM|SN|SO|SR|ST|SU|SV|SY|SZ|TC|TD|TEL|TF|TG|TH|TJ|TK|TL|TM|TN|TO|TP|TR|TRAVEL|TT|TV|TW|TZ|UA|UG|UK|US|UY|UZ|VA|VC|VE|VG|VI|VN|VU|WF|WS|XN--0ZWM56D|测试|XN--11B5BS3A9AJ6G|परीक्षा|XN--80AKHBYKNJ4F|испытание|XN--9T4B11YI5A|테스트|XN--DEBA0AD|טעסט|XN--G6W251D|測試|XN--HGBK6AJ7F53BBA|آزمایشی|XN--HLCJ6AYA9ESC7A|பரிட்சை|XN--JXALPDLP|δοκιμή|XN--KGBECHTV|إختبار|XN--ZCKZAH|テスト|YE|YT|YU|ZA|ZM|ZONE|ZW|local|loc|onion)' .
')(?![\pN\pL\-\_])'
: '') . // if common_config('linkify', 'bare_domains') is false, don't add anything here
')' .
'(?:' .
'(?:\:\d+)?' . //:port
'(?:/[' . URL_REGEX_VALID_PATH_CHARS . ']*)?' . // path
'(?:\?[' . URL_REGEX_VALID_QSTRING_CHARS . ']*)?' . // ?query string
'(?:\#[' . URL_REGEX_VALID_FRAGMENT_CHARS . ']*)?' . // #fragment
')(?<![' . URL_REGEX_EXCLUDED_END_CHARS . '])' .
')' .
'#ixu';
}
const URL_SCHEME_COLON_DOUBLE_SLASH = 1;
const URL_SCHEME_SINGLE_COLON = 2;
const URL_SCHEME_NO_DOMAIN = 4;
const URL_SCHEME_COLON_COORDINATES = 8;
public function URLSchemes($filter = null)
{
// TODO: move these to config
$schemes = [
'http' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'https' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'ftp' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'ftps' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'mms' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'rtsp' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'gopher' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'news' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'nntp' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'telnet' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'wais' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'file' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'prospero' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'webcal' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'irc' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'ircs' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
'aim' => self::URL_SCHEME_SINGLE_COLON,
'bitcoin' => self::URL_SCHEME_SINGLE_COLON,
'fax' => self::URL_SCHEME_SINGLE_COLON,
'jabber' => self::URL_SCHEME_SINGLE_COLON,
'mailto' => self::URL_SCHEME_SINGLE_COLON,
'tel' => self::URL_SCHEME_SINGLE_COLON,
'xmpp' => self::URL_SCHEME_SINGLE_COLON,
'magnet' => self::URL_SCHEME_NO_DOMAIN,
'geo' => self::URL_SCHEME_COLON_COORDINATES,
];
return array_keys(array_filter($schemes, fn ($scheme) => is_null($filter) || ($scheme & $filter)));
}
/**
* Find links in the given text and pass them to the given callback function.
*
* @param string $text
*/
public function replaceURLs(string $text): string
{
$regex = $this->getURLRegex();
return preg_replace_callback($regex, fn ($matches) => $this->callbackHelper($matches, [$this, 'linkify']), $text);
}
/**
* Intermediate callback for `replaceURLs()`, which helps resolve some
* ambiguous link forms before passing on to the final callback.
*
* @param array $matches
* @param callable(string $text): string $callback: return replacement text
*
* @return string
*/
private function callbackHelper(array $matches, callable $callback): string
{
$url = $matches[1];
$left = strpos($matches[0], $url);
$right = $left + strlen($url);
$groupSymbolSets = [
[
'left' => '(',
'right' => ')',
],
[
'left' => '[',
'right' => ']',
],
[
'left' => '{',
'right' => '}',
],
[
'left' => '<',
'right' => '>',
],
];
$cannotEndWith = ['.', '?', ',', '#'];
do {
$original_url = $url;
foreach ($groupSymbolSets as $groupSymbolSet) {
if (substr($url, -1) == $groupSymbolSet['right']) {
$group_left_count = substr_count($url, $groupSymbolSet['left']);
$group_right_count = substr_count($url, $groupSymbolSet['right']);
if ($group_left_count < $group_right_count) {
--$right;
$url = substr($url, 0, -1);
}
}
}
if (in_array(substr($url, -1), $cannotEndWith)) {
--$right;
$url = substr($url, 0, -1);
}
} while ($original_url != $url);
$result = $callback($url);
return substr($matches[0], 0, $left) . $result . substr($matches[0], $right);
}
/**
* Convert a plain text $url to HTML <a>
*/
public function linkify(string $url): string
{
// It comes in special'd, so we unspecial it before passing to the stringifying
// functions
$url = htmlspecialchars_decode($url);
if (strpos($url, '@') !== false && strpos($url, ':') === false && ($email = filter_var($url, FILTER_VALIDATE_EMAIL)) !== false) {
//url is an email address without the mailto: protocol
$url = "mailto:{$email}";
}
$attrs = ['href' => $url, 'title' => $url];
// TODO Check to see whether this is a known "attachment" URL.
// Whether to nofollow
$nf = Common::config('nofollow', 'external');
if ($nf == 'never') {
$attrs['rel'] = 'external';
} else {
$attrs['rel'] = 'noopener nofollow external noreferrer';
}
return HTML::html(['a' => ['attrs' => $attrs, $url]], options: ['indent' => false]);
}
}