264 lines
13 KiB
PHP
264 lines
13 KiB
PHP
<?php
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// {{{ License
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// This file is part of GNU social - https://www.gnu.org/software/social
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//
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// GNU social is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GNU social is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with GNU social. If not, see <http://www.gnu.org/licenses/>.
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// }}}
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namespace Component\Link;
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use App\Core\DB\DB;
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use App\Core\Event;
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use App\Core\Modules\Component;
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use App\Entity;
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use App\Entity\NoteToLink;
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use App\Util\Common;
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use App\Util\HTML;
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use InvalidArgumentException;
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class Link extends Component
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{
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/**
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* Extract URLs from $content and create the appropriate Link and NoteToLink entities
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*/
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public function onProcessNoteContent(int $note_id, string $content)
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{
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if (Common::config('attachments', 'process_links')) {
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$matched_urls = [];
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preg_match($this->getURLRegex(), $content, $matched_urls);
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$matched_urls = array_unique($matched_urls);
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foreach ($matched_urls as $match) {
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try {
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$link_id = Entity\Link::getOrCreate($match)->getId();
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DB::persist(NoteToLink::create(['link_id' => $link_id, 'note_id' => $note_id]));
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} catch (InvalidArgumentException) {
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continue;
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}
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}
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}
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return Event::next;
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}
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public function onRenderContent(string &$text)
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{
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$text = $this->replaceURLs($text);
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}
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public function getURLRegex(): string
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{
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$geouri_labeltext_regex = '\pN\pL\-';
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$geouri_mark_regex = '\-\_\.\!\~\*\\\'\(\)'; // the \\\' is really pretty
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$geouri_unreserved_regex = '\pN\pL' . $geouri_mark_regex;
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$geouri_punreserved_regex = '\[\]\:\&\+\$';
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$geouri_pctencoded_regex = '(?:\%[0-9a-fA-F][0-9a-fA-F])';
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$geouri_paramchar_regex = $geouri_unreserved_regex . $geouri_punreserved_regex; //FIXME: add $geouri_pctencoded_regex here so it works
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return '#' .
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'(?:^|[\s\<\>\(\)\[\]\{\}\\\'\\\";]+)(?![\@\!\#])' .
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'(' .
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'(?:' .
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'(?:' . //Known protocols
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'(?:' .
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'(?:(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_COLON_DOUBLE_SLASH)) . ')://)' .
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'|' .
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'(?:(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_SINGLE_COLON)) . '):)' .
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')' .
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'(?:[\pN\pL\-\_\+\%\~]+(?::[\pN\pL\-\_\+\%\~]+)?\@)?' . //user:pass@
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'(?:' .
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'(?:' .
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'\[[\pN\pL\-\_\:\.]+(?<![\.\:])\]' . //[dns]
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')|(?:' .
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'[\pN\pL\-\_\:\.]+(?<![\.\:])' . //dns
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')' .
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')' .
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')' .
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'|(?:' .
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'(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_COLON_COORDINATES)) . '):' .
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// There's an order that must be followed here too, if ;crs= is used, it must precede ;u=
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// Also 'crsp' (;crs=$crsp) must match $geouri_labeltext_regex
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// Also 'uval' (;u=$uval) must be a pnum: \-?[0-9]+
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'(?:' .
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'(?:[0-9]+(?:\.[0-9]+)?(?:\,[0-9]+(?:\.[0-9]+)?){1,2})' . // 1(.23)?(,4(.56)){1,2}
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'(?:\;(?:[' . $geouri_labeltext_regex . ']+)(?:\=[' . $geouri_paramchar_regex . ']+)*)*' .
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')' .
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')' .
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// URLs without domain name, like magnet:?xt=...
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'|(?:(?:' . implode('|', $this->URLSchemes(self::URL_SCHEME_NO_DOMAIN)) . '):(?=\?))' . // zero-length lookahead requires ? after :
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(Common::config('linkify', 'ipv4') // Convert IPv4 addresses to hyperlinks
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? '|(?:(?: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]?)'
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: '') .
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(Common::config('linkify', 'ipv6') // Convert IPv6 addresses to hyperlinks
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? '|(?:' . //IPv6
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'\[?(?:(?:(?:[0-9A-Fa-f]{1,4}:){7}(?:(?:[0-9A-Fa-f]{1,4})|:))|(?:(?:[0-9A-Fa-f]{1,4}:){6}(?::|(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})|(?::[0-9A-Fa-f]{1,4})))|(?:(?:[0-9A-Fa-f]{1,4}:){5}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:){4}(?::[0-9A-Fa-f]{1,4}){0,1}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:){3}(?::[0-9A-Fa-f]{1,4}){0,2}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:){2}(?::[0-9A-Fa-f]{1,4}){0,3}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:[0-9A-Fa-f]{1,4}:)(?::[0-9A-Fa-f]{1,4}){0,4}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?::(?::[0-9A-Fa-f]{1,4}){0,5}(?:(?::(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})?)|(?:(?::[0-9A-Fa-f]{1,4}){1,2})))|(?:(?:(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})(?:\.(?:25[0-5]|2[0-4]\d|[01]?\d{1,2})){3})))\]?(?<!:)' .
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')'
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: '') .
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(Common::config('linkify', 'bare_domains')
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? '|(?:' . //DNS
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'(?:[\pN\pL\-\_\+\%\~]+(?:\:[\pN\pL\-\_\+\%\~]+)?\@)?' . //user:pass@
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'[\pN\pL\-\_]+(?:\.[\pN\pL\-\_]+)*\.' .
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//tld list from http://data.iana.org/TLD/tlds-alpha-by-domain.txt, also added local, loc, and onion
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'(?: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)' .
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')(?![\pN\pL\-\_])'
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: '') . // if common_config('linkify', 'bare_domains') is false, don't add anything here
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')' .
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'(?:' .
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'(?:\:\d+)?' . //:port
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'(?:/[' . URL_REGEX_VALID_PATH_CHARS . ']*)?' . // path
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'(?:\?[' . URL_REGEX_VALID_QSTRING_CHARS . ']*)?' . // ?query string
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'(?:\#[' . URL_REGEX_VALID_FRAGMENT_CHARS . ']*)?' . // #fragment
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')(?<![' . URL_REGEX_EXCLUDED_END_CHARS . '])' .
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')' .
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'#ixu';
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}
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const URL_SCHEME_COLON_DOUBLE_SLASH = 1;
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const URL_SCHEME_SINGLE_COLON = 2;
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const URL_SCHEME_NO_DOMAIN = 4;
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const URL_SCHEME_COLON_COORDINATES = 8;
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public function URLSchemes($filter = null)
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{
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// TODO: move these to config
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$schemes = [
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'http' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'https' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'ftp' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'ftps' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'mms' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'rtsp' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'gopher' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'news' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'nntp' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'telnet' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'wais' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'file' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'prospero' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'webcal' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'irc' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'ircs' => self::URL_SCHEME_COLON_DOUBLE_SLASH,
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'aim' => self::URL_SCHEME_SINGLE_COLON,
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'bitcoin' => self::URL_SCHEME_SINGLE_COLON,
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'fax' => self::URL_SCHEME_SINGLE_COLON,
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'jabber' => self::URL_SCHEME_SINGLE_COLON,
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'mailto' => self::URL_SCHEME_SINGLE_COLON,
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'tel' => self::URL_SCHEME_SINGLE_COLON,
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'xmpp' => self::URL_SCHEME_SINGLE_COLON,
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'magnet' => self::URL_SCHEME_NO_DOMAIN,
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'geo' => self::URL_SCHEME_COLON_COORDINATES,
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];
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return array_keys(array_filter($schemes, fn ($scheme) => is_null($filter) || ($scheme & $filter)));
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}
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/**
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* Find links in the given text and pass them to the given callback function.
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*
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* @param string $text
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*/
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public function replaceURLs(string $text): string
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{
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$regex = $this->getURLRegex();
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return preg_replace_callback($regex, fn ($matches) => $this->callbackHelper($matches, [$this, 'linkify']), $text);
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}
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/**
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* Intermediate callback for `replaceURLs()`, which helps resolve some
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* ambiguous link forms before passing on to the final callback.
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*
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* @param array $matches
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* @param callable(string $text): string $callback: return replacement text
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*
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* @return string
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*/
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private function callbackHelper(array $matches, callable $callback): string
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{
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$url = $matches[1];
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$left = strpos($matches[0], $url);
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$right = $left + strlen($url);
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$groupSymbolSets = [
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[
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'left' => '(',
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'right' => ')',
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],
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[
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'left' => '[',
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'right' => ']',
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],
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[
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'left' => '{',
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'right' => '}',
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],
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[
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'left' => '<',
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'right' => '>',
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],
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];
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$cannotEndWith = ['.', '?', ',', '#'];
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do {
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$original_url = $url;
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foreach ($groupSymbolSets as $groupSymbolSet) {
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if (substr($url, -1) == $groupSymbolSet['right']) {
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$group_left_count = substr_count($url, $groupSymbolSet['left']);
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$group_right_count = substr_count($url, $groupSymbolSet['right']);
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if ($group_left_count < $group_right_count) {
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--$right;
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$url = substr($url, 0, -1);
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}
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}
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}
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if (in_array(substr($url, -1), $cannotEndWith)) {
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--$right;
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$url = substr($url, 0, -1);
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}
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} while ($original_url != $url);
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$result = $callback($url);
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return substr($matches[0], 0, $left) . $result . substr($matches[0], $right);
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}
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/**
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* Convert a plain text $url to HTML <a>
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*/
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public function linkify(string $url): string
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{
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// It comes in special'd, so we unspecial it before passing to the stringifying
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// functions
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$url = htmlspecialchars_decode($url);
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if (strpos($url, '@') !== false && strpos($url, ':') === false && ($email = filter_var($url, FILTER_VALIDATE_EMAIL)) !== false) {
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//url is an email address without the mailto: protocol
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$url = "mailto:{$email}";
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}
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$attrs = ['href' => $url, 'title' => $url];
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// TODO Check to see whether this is a known "attachment" URL.
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// Whether to nofollow
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$nf = Common::config('nofollow', 'external');
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if ($nf == 'never') {
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$attrs['rel'] = 'external';
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} else {
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$attrs['rel'] = 'noopener nofollow external noreferrer';
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}
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return HTML::html(['a' => ['attrs' => $attrs, $url]], options: ['indent' => false]);
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}
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}
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