friendica-addons/nsfw/nsfw.php

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<?php
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/**
* Name: NSFW
* Description: Collapse posts with inappropriate content
* Version: 1.0
* Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
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*
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*/
use Friendica\App;
use Friendica\Core\Hook;
use Friendica\Core\Renderer;
use Friendica\DI;
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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');
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}
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// 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
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// check against the rest of the body.
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function nsfw_extract_photos($body)
{
$new_body = '';
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$img_start = strpos($body, 'src="data:');
$img_end = (($img_start !== false) ? strpos(substr($body, $img_start), '>') : false);
$cnt = 0;
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while ($img_end !== false) {
$img_end += $img_start;
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$new_body = $new_body . substr($body, 0, $img_start);
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$cnt ++;
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$body = substr($body, 0, $img_end);
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$img_start = strpos($body, 'src="data:');
$img_end = (($img_start !== false) ? strpos(substr($body, $img_start), '>') : false);
}
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if (!$cnt) {
return $body;
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}
return $new_body;
}
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function nsfw_addon_settings(App &$a, array &$data)
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{
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if (!DI::userSession()->getLocalUserId()) {
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return;
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}
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$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,
];
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}
function nsfw_addon_settings_post(App $a, array &$b)
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{
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if (!DI::userSession()->getLocalUserId()) {
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return;
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}
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if (!empty($_POST['nsfw-submit'])) {
$enable = !empty($_POST['nsfw-enable']) ? intval($_POST['nsfw-enable']) : 0;
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$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);
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DI::pConfig()->set(DI::userSession()->getLocalUserId(), 'nsfw', 'disable', $disable);
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}
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}
function nsfw_prepare_body_content_filter(App $a, &$hook_data)
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{
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$words = null;
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if (DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'nsfw', 'disable')) {
return;
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}
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if (DI::userSession()->getLocalUserId()) {
$words = DI::pConfig()->get(DI::userSession()->getLocalUserId(), 'nsfw', 'words');
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}
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if ($words) {
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$word_list = explode(',', $words);
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} else {
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$word_list = ['nsfw'];
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}
$found = false;
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if (count($word_list)) {
$body = $hook_data['item']['title'] . "\n" . nsfw_extract_photos($hook_data['item']['body']);
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foreach ($word_list as $word) {
$word = trim($word);
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if (!strlen($word)) {
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continue;
}
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$tag_search = false;
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switch ($word[0]) {
case '/'; // Regular expression
$found = @preg_match($word, $body);
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break;
case '#': // Hashtag-only search
$tag_search = true;
$found = nsfw_find_word_in_item_tags($hook_data['item']['hashtags'], substr($word, 1));
break;
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default:
$found = strpos($body, $word) !== false || nsfw_find_word_in_item_tags($hook_data['item']['tags'], $word);
break;
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}
if ($found) {
break;
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}
}
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}
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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', $word);
}
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}
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}
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function nsfw_find_word_in_item_tags($item_tags, $word)
{
if (is_array($item_tags)) {
foreach ($item_tags as $tag) {
if (stripos($tag, '>' . $word . '<') !== false) {
return true;
}
}
}
return false;
}