gnu-social/components/Link/Link.php

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<?php
declare(strict_types = 1);
// {{{ 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;
use App\Core\Event;
use App\Core\Modules\Component;
use App\Entity\Actor;
use App\Entity\Note;
use App\Util\Common;
use App\Util\HTML;
use Component\Link\Entity\NoteToLink;
use EventResult;
use InvalidArgumentException;
class Link extends Component
{
/**
* Note that this persists both a Link and a NoteToLink
*
* @return array{ link: ?Entity\Link, note_to_link: ?NoteToLink }
*/
public static function maybeCreateLink(string $url, int $note_id): array
{
try {
$link = Entity\Link::getOrCreate($url);
DB::persist($note_link = NoteToLink::create(['link_id' => $link->getId(), 'note_id' => $note_id]));
return ['link' => $link, 'note_to_link' => $note_link];
} catch (InvalidArgumentException) {
return ['link' => null, 'note_to_link' => null];
}
}
/**
* Extract URLs from $content and create the appropriate Link and NoteToLink entities
*
* @param array{ignoreLinks?: string[]} $process_note_content_extra_args
*/
public function onProcessNoteContent(Note $note, string $content, string $content_type, array $process_note_content_extra_args = []): EventResult
{
$ignore = $process_note_content_extra_args['ignoreLinks'] ?? [];
if (Common::config('attachments', 'process_links')) {
$matched_urls = [];
preg_match_all($this->getURLRegex(), $content, $matched_urls);
$matched_urls = array_unique($matched_urls[1]);
foreach ($matched_urls as $match) {
if (\in_array($match, $ignore)) {
continue;
}
self::maybeCreateLink($match, $note->getId());
}
}
return Event::next;
}
public function onRenderPlainTextNoteContent(string &$text): EventResult
{
$text = $this->replaceURLs($text);
return Event::next;
}
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';
}
public const URL_SCHEME_COLON_DOUBLE_SLASH = 1;
public const URL_SCHEME_SINGLE_COLON = 2;
public const URL_SCHEME_NO_DOMAIN = 4;
public const URL_SCHEME_COLON_COORDINATES = 8;
/**
* @param self::URL_SCHEME_COLON_COORDINATES|self::URL_SCHEME_COLON_DOUBLE_SLASH|self::URL_SCHEME_NO_DOMAIN|self::URL_SCHEME_SINGLE_COLON $filter
*
* @return string[]
*/
public function URLSchemes(?int $filter = null): array
{
// 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.
*/
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 string[] $matches
* @param callable(string $text): string $callback: return replacement text
*/
private function callbackHelper(array $matches, callable $callback): string
{
$url = $matches[1];
$left = mb_strpos($matches[0], $url);
$right = $left + mb_strlen($url);
$groupSymbolSets = [
[
'left' => '(',
'right' => ')',
],
[
'left' => '[',
'right' => ']',
],
[
'left' => '{',
'right' => '}',
],
[
'left' => '<',
'right' => '>',
],
];
$cannotEndWith = ['.', '?', ',', '#'];
do {
$original_url = $url;
foreach ($groupSymbolSets as $groupSymbolSet) {
if (mb_substr($url, -1) == $groupSymbolSet['right']) {
$group_left_count = mb_substr_count($url, $groupSymbolSet['left']);
$group_right_count = mb_substr_count($url, $groupSymbolSet['right']);
if ($group_left_count < $group_right_count) {
--$right;
$url = mb_substr($url, 0, -1);
}
}
}
if (\in_array(mb_substr($url, -1), $cannotEndWith)) {
--$right;
$url = mb_substr($url, 0, -1);
}
} while ($original_url != $url);
$result = $callback($url);
return mb_substr($matches[0], 0, $left) . $result . mb_substr($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 (str_contains($url, '@') && !str_contains($url, ':') && ($email = filter_var($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, $url]], options: ['indent' => false]);
}
public function onNoteDeleteRelated(Note &$note, Actor $actor): EventResult
{
DB::wrapInTransaction(fn () => NoteToLink::removeWhereNoteId($note->getId()));
return Event::next;
}
}