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gnu-social/src/Util/Formatting.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/>.
// }}}
/**
* String formatting utilities
*
* @package GNUsocial
* @category Util
*
* @author Hugo Sales <hugo@hsal.es>
* @copyright 2020-2021 Free Software Foundation, Inc http://www.fsf.org
* @license https://www.gnu.org/licenses/agpl.html GNU AGPL v3 or later
*/
namespace App\Util;
use App\Core\DB;
use App\Core\Event;
use App\Core\Log;
use App\Entity\Actor;
use App\Util\Exception\NicknameException;
use App\Util\Exception\ServerException;
use Component\Circle\Circle;
use Component\Circle\Entity\ActorCircle;
use Component\Group\Entity\LocalGroup;
use Component\Tag\Tag;
use Exception;
use Functional as F;
use InvalidArgumentException;
abstract class Formatting
{
private static ?\Twig\Environment $twig;
public static function setTwig(\Twig\Environment $twig)
{
self::$twig = $twig;
}
public static function twigRenderString(string $template, array $context): string
{
return self::$twig->createTemplate($template, null)->render($context);
}
public static function twigRenderFile(string $template_path, array $context): string
{
return self::$twig->render($template_path, $context);
}
/**
* Normalize path by converting \ to /
*/
public static function normalizePath(string $path): string
{
return preg_replace(',(/|\\\\)+,', '/', $path);
}
/**
* Get plugin name from it's path, or null if not a plugin
*/
public static function moduleFromPath(string $path): ?string
{
foreach (['/plugins/', '/components/'] as $mod_p) {
$module = mb_strpos($path, $mod_p);
if ($module === false) {
continue;
}
$cut = $module + mb_strlen($mod_p);
$cut2 = mb_strpos($path, '/', $cut);
if ($cut2) {
$final = mb_substr($path, $cut, $cut2 - $cut);
} else {
// We might be running directly from the plugins dir?
// If so, there's no place to store locale info.
$m = 'The GNU social install dir seems to contain a piece named \'plugin\' or \'component\'';
Log::critical($m);
throw new ServerException($m);
}
return $final;
}
return null;
}
/**
* Check whether $haystack starts with $needle
*
* @param array|string $haystack if array, check that all strings start with $needle (see below)
* @param array|string $needle if array, check that one of the $needles is found
*/
public static function startsWith(array|string $haystack, array|string $needle): bool
{
if (\is_string($haystack)) {
return F\some(\is_array($needle) ? $needle : [$needle], fn ($n) => str_starts_with($haystack, $n));
} else {
return F\every($haystack, fn ($haystack) => self::startsWith($haystack, $needle));
}
}
/**
* Check whether $haystack ends with $needle
*
* @param array|string $haystack if array, check that all strings end with $needle (see below)
* @param array|string $needle if array, check that one of the $needles is found
*/
public static function endsWith(array|string $haystack, array|string $needle): bool
{
if (\is_string($haystack)) {
return F\some(\is_array($needle) ? $needle : [$needle], fn ($n) => str_ends_with($haystack, $n));
} else {
return F\every($haystack, fn ($haystack) => self::endsWith($haystack, $needle));
}
}
/**
* If $haystack starts with $needle, remove it from the beginning
*/
public static function removePrefix(string $haystack, string $needle)
{
return self::startsWith($haystack, $needle) ? mb_substr($haystack, mb_strlen($needle)) : $haystack;
}
/**
* If $haystack ends with $needle, remove it from the end
*/
public static function removeSuffix(string $haystack, string $needle): string
{
return self::endsWith($haystack, $needle) && !empty($needle) ? mb_substr($haystack, 0, -mb_strlen($needle)) : $haystack;
}
public static function camelCaseToSnakeCase(string $str): string
{
return mb_strtolower(preg_replace('/([a-z])([A-Z])/', '$1_$2', $str));
}
public static function snakeCaseToCamelCase(string $str): string
{
return implode('', F\map(preg_split('/[\b_]/', $str), F\ary('ucfirst', 1)));
}
public static function snakeCaseToPascalCase(string $str): string
{
return ucfirst(self::snakeCaseToCamelCase($str));
}
/**
* Indent $in, a string or array, $level levels
*
* @param array|string $in
* @param int $level How many levels of indentation
* @param int $count How many spaces per indentation
*/
public static function indent($in, int $level = 1, int $count = 2): string
{
if (\is_string($in)) {
return self::indent(explode("\n", $in), $level, $count);
} elseif (\is_array($in)) {
$indent = str_repeat(' ', $count * $level);
return implode("\n", F\map(
F\select(
$in,
F\ary(fn ($s) => $s != '', 1),
),
fn ($val) => F\concat($indent . $val),
));
}
throw new InvalidArgumentException('Formatting::indent\'s first parameter must be either an array or a string. Input was: ' . $in);
}
public const SPLIT_BY_SPACE = ' ';
public const JOIN_BY_SPACE = ' ';
public const SPLIT_BY_COMMA = ', ';
public const JOIN_BY_COMMA = ', ';
public const SPLIT_BY_BOTH = '/[, ]/';
/**
* Convert scalars, objects implementing __toString or arrays to strings
*/
public static function toString(mixed $value, string $join_type = self::JOIN_BY_COMMA): string
{
if (!\in_array($join_type, [static::JOIN_BY_SPACE, static::JOIN_BY_COMMA])) {
throw new Exception('Formatting::toString received invalid join option');
} else {
if (!\is_array($value)) {
return (string) $value;
} else {
return implode($join_type, $value);
}
}
}
/**
* Convert a user supplied string to array and return whether the conversion was successful
*
* @param static::SPLIT_BY_BOTH|static::SPLIT_BY_COMMA|static::SPLIT_BY_SPACE $split_type
*/
public static function toArray(string $input, mixed &$output, string $split_type = self::SPLIT_BY_COMMA): bool
{
if (!\in_array($split_type, [static::SPLIT_BY_BOTH, static::SPLIT_BY_COMMA, static::SPLIT_BY_SPACE])) {
throw new InvalidArgumentException;
}
if ($input == '') {
$output = [];
return true;
}
$matches = [];
if (preg_match('/^ *\[?([^,]+(, ?[^,]+)*)\]? *$/', $input, $matches)) {
switch ($split_type) {
case self::SPLIT_BY_BOTH:
$arr = preg_split($split_type, $matches[1], 0, \PREG_SPLIT_NO_EMPTY);
break;
case self::SPLIT_BY_COMMA:
$arr = preg_split('/, ?/', $matches[1]);
break;
default:
$arr = explode(self::SPLIT_BY_SPACE, $matches[1]);
}
$output = str_replace([' \'', '\'', ' "', '"'], '', $arr);
$output = F\map($output, F\ary('trim', 1));
return true;
}
return false;
}
/**
* Like \explode, but with multiple options for the delimiter. Will use the first one present
*/
public static function explode(array $separators, string $string)
{
foreach ($separators as $sep) {
if (str_contains($string, $sep)) {
return explode($sep, $string);
}
}
return $string;
}
/**
* Render a plain text note content into HTML, extracting links and tags
*/
public static function renderPlainText(string $text, ?string $language = null): string
{
$text = self::quoteAndRemoveControlCodes($text);
// Split \n\n into paragraphs, process each paragraph and merge
return implode("\n", F\map(explode("\n\n", $text), function (string $paragraph) use ($language) {
$paragraph = nl2br($paragraph, use_xhtml: false);
Event::handle('RenderPlainTextNoteContent', [&$paragraph, $language]);
return HTML::html(['p' => [$paragraph]], options: ['raw' => true, 'indent' => false]);
}));
}
/**
* Quote HTML special chars and strip Unicode text
* formatting/direction codes. This is can be pretty dangerous for
* visualisation of text or be used for mischief
*/
public static function quoteAndRemoveControlCodes(string $text): string
{
// Quote special chars
$text = htmlspecialchars($text, flags: \ENT_QUOTES | \ENT_SUBSTITUTE, double_encode: false);
// Normalize newlines to strictly \n and remove ASCII control codes
return preg_replace(['/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}\x{200b}-\x{200f}\x{202a}-\x{202e}]/u', '/\R/u'], ['', "\n"], $text);
}
/**
* Convert $str to it's closest ASCII representation
*/
public static function slugify(string $str, int $length = 64): string
{
// php-intl is highly recommended...
if (!\function_exists('transliterator_transliterate')) {
$str = preg_replace('/[^\pL\pN]/u', '', $str);
$str = mb_convert_case($str, \MB_CASE_LOWER, 'UTF-8');
return mb_substr($str, 0, $length);
}
$str = transliterator_transliterate('Any-Latin;' // any charset to latin compatible
. 'NFD;' // decompose
. '[:Nonspacing Mark:] Remove;' // remove nonspacing marks (accents etc.)
. 'NFC;' // composite again
. '[:Punctuation:] Remove;' // remove punctuation (.,¿? etc.)
. 'Lower();' // turn into lowercase
. 'Latin-ASCII;', // get ASCII equivalents (ð to d for example)
$str, );
return mb_substr(preg_replace('/[^\pL\pN]/u', '', $str), 0, $length);
}
/**
* Find @-mentions in the given text, using the given notice object as context.
* References will be resolved with common_relative_profile() against the user
* who posted the notice.
*
* Note the return data format is internal, to be used for building links and
* such. Should not be used directly; rather, call common_linkify_mentions().
*
* @param Actor $actor the Actor that is sending the current text
*/
public static function findMentions(string $text, Actor $actor): array
{
$mentions = [];
// XXX: We remove <span> because when content is in html the tag comes as #<span>hashtag</span>
$text = str_replace('<span>', '', $text);
if (Event::handle('StartFindMentions', [$actor, $text, &$mentions]) !== Event::stop) {
// @person mentions
$person_matches = self::findMentionsRaw($text, '@');
foreach ($person_matches as $match) {
try {
$nickname = Nickname::normalize($match[0], check_already_used: false, check_is_allowed: false);
} catch (NicknameException) {
// Bogus match? Drop it.
continue;
}
$mentioned = $actor->findRelativeActor($nickname);
if ($mentioned instanceof Actor) {
$url = $mentioned->getUri(); // prefer the URI as URL, if it is one.
if (!Common::isValidHttpUrl($url)) {
$url = $mentioned->getUrl();
}
$mention = [
'mentioned' => [$mentioned],
'type' => 'mention',
'text' => $match[0],
'position' => $match[1],
'length' => mb_strlen($match[0]),
'title' => $mentioned->getFullname() ?? $mentioned->getNickname(),
'url' => $url,
];
$mentions[] = $mention;
}
}
// @#circle/self-tag => mention of all subscribed circles tagged 'tag'
$tag_matches = [];
preg_match_all(
Circle::TAG_CIRCLE_REGEX,
$text,
$tag_matches,
\PREG_OFFSET_CAPTURE,
);
foreach ($tag_matches[1] as $tag_match) {
$tag = Tag::extract($tag_match[0]);
if (!Tag::validate($tag)) {
continue; // Ignore invalid tags
}
$ac = DB::findOneBy(ActorCircle::class, [
'tag' => $tag, // Notify circle of name tag WHERE
'tagger' => $actor->getID(), // Circle was created by Actor
], return_null: true);
if (\is_null($ac) || $ac->getPrivate()) {
continue;
}
$mentions[] = [
'mentioned' => $ac->getSubscribedActors(),
'type' => 'list',
'text' => $tag_match[0],
'position' => $tag_match[1],
'length' => mb_strlen($tag_match[0]),
'url' => $ac->getUrl(),
];
}
// !group/!org mentions
$group_matches = self::findMentionsRaw($text, '!');
foreach ($group_matches as $match) {
try {
$nickname = Nickname::normalize($match[0], check_already_used: false, check_is_allowed: false);
} catch (NicknameException) {
// Bogus match? Drop it.
continue;
}
$mentioned = LocalGroup::getActorByNickname($nickname);
if ($mentioned instanceof Actor) {
$url = $mentioned->getUri(); // prefer the URI as URL, if it is one.
if (!Common::isValidHttpUrl($url)) {
$url = $mentioned->getUrl();
}
$mentions[] = [
'mentioned' => [$mentioned],
'type' => 'group',
'text' => $match[0],
'position' => $match[1],
'length' => mb_strlen($match[0]),
'title' => $mentioned->getFullname() ?? $mentioned->getNickname(),
'url' => $url,
];
}
}
Event::handle('EndFindMentions', [$actor, $text, &$mentions]);
}
return $mentions;
}
/**
* Does the actual regex pulls to find @-mentions in text.
* Should generally not be called directly; for use in common_find_mentions.
*
* @param string $preMention Character(s) that signals a mention ('@', '!'...)
*
* @return array of PCRE match arrays
*/
private static function findMentionsRaw(string $text, string $preMention = '@'): array
{
$atmatches = [];
// the regexp's "(?!\@)" makes sure it doesn't matches the single "@remote" in "@remote@server.com"
preg_match_all(
'/' . Nickname::BEFORE_MENTIONS . preg_quote($preMention, '/') . '(' . Nickname::DISPLAY_FMT . ')\b(?!\@)/',
$text,
$atmatches,
\PREG_OFFSET_CAPTURE,
);
return $atmatches[1];
}
/**
* Finds @-mentions within the partially-rendered text section and
* turns them into live links.
*
* Should generally not be called except from common_render_content().
*
* @param string $text partially-rendered HTML
* @param Actor $author the Actor that is composing the current notice
*
* @return array [partially-rendered HTML, array of mentions]
*/
public static function linkifyMentions(string $text, Actor $author, ?string $locale): array
{
$mentions = self::findMentions($text, $author);
// We need to go through in reverse order by position,
// so our positions stay valid despite our fudging with the
// string!
$points = [];
foreach ($mentions as $mention) {
$points[$mention['position']] = $mention;
}
krsort($points);
foreach ($points as $position => $mention) {
$linkText = self::linkifyMentionArray($mention);
$text = substr_replace($text, $linkText, $position, $mention['length']);
}
return [$text, $mentions];
}
public static function linkifyMentionArray(array $mention)
{
$output = null;
if (Event::handle('StartLinkifyMention', [$mention, &$output]) === Event::next) {
$attrs = [
'href' => $mention['url'],
'class' => 'h-card u-url p-nickname ' . $mention['type'], // https://microformats.org/wiki/h-card
];
if (!empty($mention['title'])) {
$attrs['title'] = $mention['title'];
}
$output = HTML::html(['span' => ['attrs' => ['class' => 'h-card'],
HTML::html(['a' => ['attrs' => $attrs, $mention['title'] ?? $mention['text']]], options: ['indent' => false]),
]], options: ['indent' => false, 'raw' => true]);
Event::handle('EndLinkifyMention', [$mention, &$output]);
}
return $output;
}
/**
* Split words by `-`, `_` or lower to upper case transitions
*/
public static function splitWords(string $words): array
{
return preg_split('/-|_|(?<=\p{Ll})(?=\p{Lu})/u', $words);
}
}