<?php


/**
 * Name: NSFW
 * Description: Collapse posts with inappropriate content
 * Version: 1.0
 * Author: Mike Macgirvin <http://macgirvin.com/profile/mike>
 * 
 */

function nsfw_install() {
	register_hook('prepare_body', 'addon/nsfw/nsfw.php', 'nsfw_prepare_body', 10);
	register_hook('feature_settings', 'addon/nsfw/nsfw.php', 'nsfw_addon_settings');
	register_hook('feature_settings_post', 'addon/nsfw/nsfw.php', 'nsfw_addon_settings_post');

}


function nsfw_uninstall() {
	unregister_hook('prepare_body', 'addon/nsfw/nsfw.php', 'nsfw_prepare_body');
	unregister_hook('feature_settings', 'addon/nsfw/nsfw.php', 'nsfw_addon_settings');
	unregister_hook('feature_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:');
	if(! $img_start)
		return $body;

	$img_end = (($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(&$a,&$s) {


	if(! local_channel())
		return;

	/* Add our stylesheet to the page so we can make our settings look nice */

	//head_add_css('/addon/nsfw/nsfw.css');

	$enable_checked = (intval(get_pconfig(local_channel(),'nsfw','disable')) ? false : 1);
	$words = get_pconfig(local_channel(),'nsfw','words');
	if(! $words)
		$words = 'nsfw,';
	$sc .= '<div class="section-content-info-wrapper">';
	$sc .= t('This plugin looks in posts for the words/text you specify below, and collapses any content containing those keywords so it is not displayed at inappropriate times, such as sexual innuendo that may be improper in a work setting. It is polite and recommended to tag any content containing nudity with #NSFW.  This filter can also match any other word/text you specify, and can thereby be used as a general purpose content filter.');
	$sc .= '</div>';

	$sc .= replace_macros(get_markup_template('field_checkbox.tpl'), array(
		'$field'	=> array('nsfw-enable', t('Enable Content filter'), $enable_checked, '', array(t('No'),t('Yes'))),
	));

	$sc .= replace_macros(get_markup_template('field_input.tpl'), array(
		'$field'	=> array('nsfw-words', t('Comma separated list of keywords to hide'), $words, t('Use /expression/ to provide regular expressions'))
	));

	$s .= replace_macros(get_markup_template('generic_addon_settings.tpl'), array(
		'$addon' 	=> array('nsfw', t('Not Safe For Work Settings'), t('General Purpose Content Filter'), t('Submit')),
		'$content'	=> $sc
	));

	return;

}

function nsfw_addon_settings_post(&$a,&$b) {

	if(! local_channel())
		return;

	if($_POST['nsfw-submit']) {
		set_pconfig(local_channel(),'nsfw','words',trim($_POST['nsfw-words']));
		$enable = ((x($_POST,'nsfw-enable')) ? intval($_POST['nsfw-enable']) : 0);
		$disable = 1-$enable;
		set_pconfig(local_channel(),'nsfw','disable', $disable);
		info( t('NSFW Settings saved.') . EOL);
	}
}

function nsfw_prepare_body(&$a,&$b) {

	$words = null;

	if(get_pconfig(local_channel(),'nsfw','disable'))
		return;

	if(local_channel()) {
		$words = get_pconfig(local_channel(),'nsfw','words');
	}
	if($words) {
		$arr = explode(',',$words);
	}
	else {
		$arr = array('nsfw');
	}

	$found = false;
	if(count($arr)) {

		$body = nsfw_extract_photos($b['html']);

		foreach($arr as $word) {
			$word = trim($word);
			$author = '';

			if(! strlen($word)) {
				continue;
			}

			if(strpos($word,'lang=') === 0) {
				if(! $b['item']['lang'])
					continue;
				$l = substr($word,5);
				if(strlen($l) && strcasecmp($l,$b['item']['lang']) !== 0)
					continue;
				$found = true;
				$orig_word = $word;
				break;
			}
			if(strpos($word,'lang!=') === 0) {
				if(! $b['item']['lang'])
					continue;
				$l = substr($word,6);
				if(strlen($l) && strcasecmp($l,$b['item']['lang']) === 0)
					continue;
				$found = true;
				$orig_word = $word;
				break;
			}

			$orig_word = $word;

			if(strpos($word,'::') !== false) {
				$author = substr($word,0,strpos($word,'::'));
				$word = substr($word,strpos($word,'::')+2);
			}			
			if($author && stripos($b['item']['author']['xchan_name'],$author) === false)
				continue;


			if(! $word)
				$found = true;

			if(strpos($word,'/') === 0) {
				if(preg_match($word,$body)) {
					$found = true;
					break;
				}
			}
			else {
				if(stristr($body,$word)) {
					$found = true;
					break;
				}
				if($b['item']['term']) {
					foreach($b['item']['term'] as $t) {
						if(stristr($t['term'],$word )) {
							$found = true;
							break;
						}
					}
				}
				if($found)
					break; 
			}
		}
	}

	$ob_hash = get_observer_hash();
	if((! $ob_hash) 
		&& (intval($b['item']['author']['xchan_censored']) || intval($b['item']['author']['xchan_selfcensored']))) {
		$found = true;
		$orig_word = t('Possible adult content');
	}	
	if($found) {
		$rnd = random_string(8);
		$b['html'] = '<div id="nsfw-wrap-' . $rnd . '" class="fakelink nsfw-wrap" onclick="openClose(\'nsfw-html-' . $rnd . '\'); openClose(\'nsfw-photo-' . $rnd . '\');">' . sprintf( t('%s - click to open/close'),$orig_word ) . '</div><div id="nsfw-html-' . $rnd . '" style="display: none; " >' . $b['html'] . '</div>';
		$b['photo'] = (($b['photo']) ? '<div id="nsfw-photo-' . $rnd . '" style="display: none; " >' . $b['photo'] . '</div>' : '');
	}
}