friendica-addons/nsfw/nsfw.php
Hypolite Petovan b1442ebfd1 [nsfw] Suppress warnings about failed regexp compilation
- Add failed regexp compilation system messages on addon settings submit
- Address https://github.com/friendica/friendica/issues/11992#issuecomment-1336418781
2022-12-10 14:43:30 -05:00

173 lines
4.9 KiB
PHP

<?php
/**
* Name: NSFW
* Description: Collapse posts with inappropriate content
* Version: 1.0
* Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
*
*/
use Friendica\App;
use Friendica\Core\Hook;
use Friendica\Core\Renderer;
use Friendica\DI;
function nsfw_install()
{
Hook::register('prepare_body_content_filter', 'addon/nsfw/nsfw.php', 'nsfw_prepare_body_content_filter', 10);
Hook::register('addon_settings', 'addon/nsfw/nsfw.php', 'nsfw_addon_settings');
Hook::register('addon_settings_post', 'addon/nsfw/nsfw.php', 'nsfw_addon_settings_post');
}
// This function isn't perfect and isn't trying to preserve the html structure - it's just a
// quick and dirty filter to pull out embedded photo blobs because 'nsfw' seems to come up
// inside them quite often. We don't need anything fancy, just pull out the data blob so we can
// check against the rest of the body.
function nsfw_extract_photos($body)
{
$new_body = '';
$img_start = strpos($body, 'src="data:');
$img_end = (($img_start !== false) ? strpos(substr($body, $img_start), '>') : false);
$cnt = 0;
while ($img_end !== false) {
$img_end += $img_start;
$new_body = $new_body . substr($body, 0, $img_start);
$cnt ++;
$body = substr($body, 0, $img_end);
$img_start = strpos($body, 'src="data:');
$img_end = (($img_start !== false) ? strpos(substr($body, $img_start), '>') : false);
}
if (!$cnt) {
return $body;
}
return $new_body;
}
function nsfw_addon_settings(App &$a, array &$data)
{
if (!DI::userSession()->getLocalUserId()) {
return;
}
$enabled = !DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'nsfw', 'disable');
$words = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'nsfw', 'words', 'nsfw,');
$t = Renderer::getMarkupTemplate('settings.tpl', 'addon/nsfw/');
$html = Renderer::replaceMacros($t, [
'$info' => DI::l10n()->t('This addon searches for specified words/text in posts and collapses them. It can be used to filter content tagged with for instance #NSFW that may be deemed inappropriate at certain times or places, such as being at work. It is also useful for hiding irrelevant or annoying content from direct view.'),
'$enabled' => ['nsfw-enable', DI::l10n()->t('Enable Content filter'), $enabled],
'$words' => ['nsfw-words', DI::l10n()->t('Comma separated list of keywords to hide'), $words, DI::l10n()->t('Use /expression/ to provide regular expressions, #tag to specfically match hashtags (case-insensitive), or regular words (case-sensitive)')],
]);
$data = [
'addon' => 'nsfw',
'title' => DI::l10n()->t('Content Filter (NSFW and more)'),
'html' => $html,
];
}
function nsfw_addon_settings_post(App $a, array &$b)
{
if (!DI::userSession()->getLocalUserId()) {
return;
}
if (!empty($_POST['nsfw-submit'])) {
$enable = !empty($_POST['nsfw-enable']) ? intval($_POST['nsfw-enable']) : 0;
$disable = 1 - $enable;
$words = trim($_POST['nsfw-words']);
$word_list = explode(',', $words);
foreach ($word_list as $word) {
$word = trim($word);
if (!$words || $word[0] != '/') {
continue;
}
if (@preg_match($word, '') === false) {
DI::sysmsg()->addNotice(DI::l10n()->t('Regular expression "%s" fails to compile', $word));
};
}
DI::pConfig()->set(DI::userSession()->getLocalUserId(), 'nsfw', 'words', $words);
DI::pConfig()->set(DI::userSession()->getLocalUserId(), 'nsfw', 'disable', $disable);
}
}
function nsfw_prepare_body_content_filter(App $a, &$hook_data)
{
$words = null;
if (DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'nsfw', 'disable')) {
return;
}
if (DI::userSession()->getLocalUserId()) {
$words = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'nsfw', 'words');
}
if ($words) {
$word_list = explode(',', $words);
} else {
$word_list = ['nsfw'];
}
$found = false;
if (count($word_list)) {
$body = $hook_data['item']['title'] . "\n" . nsfw_extract_photos($hook_data['item']['body']);
foreach ($word_list as $word) {
$word = trim($word);
if (!strlen($word)) {
continue;
}
$tag_search = false;
switch ($word[0]) {
case '/'; // Regular expression
$found = @preg_match($word, $body);
break;
case '#': // Hashtag-only search
$tag_search = true;
$found = nsfw_find_word_in_item_tags($hook_data['item']['hashtags'], substr($word, 1));
break;
default:
$found = strpos($body, $word) !== false || nsfw_find_word_in_item_tags($hook_data['item']['tags'], $word);
break;
}
if ($found) {
break;
}
}
}
if ($found) {
if ($tag_search) {
$hook_data['filter_reasons'][] = DI::l10n()->t('Filtered tag: %s', $word);
} else {
$hook_data['filter_reasons'][] = DI::l10n()->t('Filtered word: %s', $word);
}
}
}
function nsfw_find_word_in_item_tags($item_tags, $word)
{
if (is_array($item_tags)) {
foreach ($item_tags as $tag) {
if (stripos($tag, '>' . $word . '<') !== false) {
return true;
}
}
}
return false;
}