<?php
/**
* @file include/markdown.php
* @brief Some functions for BB conversions for Diaspora protocol.
*/
use Michelf\MarkdownExtra;
use League\HTMLToMarkdown\HtmlConverter;
require_once("include/oembed.php");
require_once("include/event.php");
require_once("include/html2bbcode.php");
require_once("include/bbcode.php");
function get_bb_tag_pos($s, $name, $occurance = 1) {
if($occurance < 1)
$occurance = 1;
$start_open = -1;
for($i = 1; $i <= $occurance; $i++) {
if( $start_open !== false)
$start_open = strpos($s, '[' . $name, $start_open + 1); // allow [name= type tags
}
if( $start_open === false)
return false;
$start_equal = strpos($s, '=', $start_open);
$start_close = strpos($s, ']', $start_open);
if( $start_close === false)
return false;
$start_close++;
$end_open = strpos($s, '[/' . $name . ']', $start_close);
if( $end_open === false)
return false;
$res = array( 'start' => array('open' => $start_open, 'close' => $start_close),
'end' => array('open' => $end_open, 'close' => $end_open + strlen('[/' . $name . ']')) );
if( $start_equal !== false)
$res['start']['equal'] = $start_equal + 1;
return $res;
}
function bb_tag_preg_replace($pattern, $replace, $name, $s) {
$string = $s;
$occurance = 1;
$pos = get_bb_tag_pos($string, $name, $occurance);
while($pos !== false && $occurance < 1000) {
$start = substr($string, 0, $pos['start']['open']);
$subject = substr($string, $pos['start']['open'], $pos['end']['close'] - $pos['start']['open']);
$end = substr($string, $pos['end']['close']);
if($end === false)
$end = '';
$subject = preg_replace($pattern, $replace, $subject);
$string = $start . $subject . $end;
$occurance++;
$pos = get_bb_tag_pos($string, $name, $occurance);
}
return $string;
}
function share_shield($m) {
return str_replace($m[1],'!=+=+=!' . base64url_encode($m[1]) . '=+!=+!=',$m[0]);
}
function share_unshield($m) {
$x = str_replace(array('!=+=+=!','=+!=+!='),array('',''),$m[1]);
return str_replace($m[1], base64url_decode($x), $m[0]);
}
function diaspora_mention_callback($matches) {
$webbie = $matches[2] . '@' . $matches[3];
$link = '';
if($webbie) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash where hubloc_addr = '%s' limit 1",
dbesc($webbie)
);
if(! $r) {
$x = discover_by_webbie($webbie);
if($x) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash where hubloc_addr = '%s' limit 1",
dbesc($webbie)
);
}
}
if($r)
$link = $r[0]['xchan_url'];
}
if(! $link)
$link = 'https://' . $matches[3] . '/u/' . $matches[2];
if($r && $r[0]['hubloc_network'] === 'zot')
return '@[zrl=' . $link . ']' . trim($matches[1]) . ((substr($matches[0],-1,1) === '+') ? '+' : '') . '[/zrl]' ;
else
return '@[url=' . $link . ']' . trim($matches[1]) . ((substr($matches[0],-1,1) === '+') ? '+' : '') . '[/url]' ;
}
function diaspora_mention_callback2($matches) {
$webbie = $matches[1] . '@' . $matches[2];
$link = '';
if($webbie) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash where hubloc_addr = '%s' limit 1",
dbesc($webbie)
);
if(! $r) {
$x = discover_by_webbie($webbie);
if($x) {
$r = q("select * from hubloc left join xchan on hubloc_hash = xchan_hash where hubloc_addr = '%s' limit 1",
dbesc($webbie)
);
}
}
if($r)
$link = $r[0]['xchan_url'];
}
$name = (($r) ? $r[0]['xchan_name'] : $matches[1]);
if(! $link)
$link = 'https://' . $matches[2] . '/u/' . $matches[1];
if($r && $r[0]['hubloc_network'] === 'zot')
return '@[zrl=' . $link . ']' . trim($name) . ((substr($matches[0],-1,1) === '+') ? '+' : '') . '[/zrl]' ;
else
return '@[url=' . $link . ']' . trim($name) . ((substr($matches[0],-1,1) === '+') ? '+' : '') . '[/url]' ;
}
/**
* @brief
*
* We don't want to support a bbcode specific markdown interpreter
* and the markdown library we have is pretty good, but provides HTML output.
* So we'll use that to convert to HTML, then convert the HTML back to bbcode,
* and then clean up a few Diaspora specific constructs.
*
* @param string $s
* @param boolean $use_zrl default false
* @return string
*/
function markdown_to_bb($s, $use_zrl = false) {
$s = str_replace("
","\r",$s);
$s = str_replace("
\n>","",$s);
if(is_array($s)) {
btlogger('markdown_to_bb called with array. ' . print_r($s,true), LOGGER_NORMAL, LOG_WARNING);
return '';
}
$s = html_entity_decode($s,ENT_COMPAT,'UTF-8');
// if empty link text replace with the url
$s = preg_replace("/\[\]\((.*?)\)/ism",'[$1]($1)',$s);
// first try plustags
$s = preg_replace_callback('/\@\{(.+?)\; (.+?)\@(.+?)\}\+/','diaspora_mention_callback',$s);
$s = preg_replace_callback('/\@\{(.+?)\; (.+?)\@(.+?)\}/','diaspora_mention_callback',$s);
$s = preg_replace_callback('/\@\{(.+?)\@(.+?)\}\+/','diaspora_mention_callback2',$s);
$s = preg_replace_callback('/\@\{(.+?)\@(.+?)\}/','diaspora_mention_callback2',$s);
// Escaping the hash tags - doesn't always seem to work
// $s = preg_replace('/\#([^\s\#])/','\\#$1',$s);
// This seems to work
$s = preg_replace('/\#([^\s\#])/','#$1',$s);
$s = MarkdownExtra::defaultTransform($s);
$s = str_replace("\r","",$s);
$s = str_replace('#','#',$s);
$s = html2bbcode($s);
// protect the recycle symbol from turning into a tag, but without unescaping angles and naked ampersands
$s = str_replace('♲',html_entity_decode('♲',ENT_QUOTES,'UTF-8'),$s);
// Convert everything that looks like a link to a link
if($use_zrl) {
$s = str_replace(array('[img','/img]'),array('[zmg','/zmg]'),$s);
$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,\@\(\)]+)/ism", '$1[zrl=$2$3]$2$3[/zrl]',$s);
}
else {
$s = preg_replace("/([^\]\=]|^)(https?\:\/\/)([a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,\@\(\)]+)/ism", '$1[url=$2$3]$2$3[/url]',$s);
}
// remove duplicate adjacent code tags
$s = preg_replace("/(\[code\])+(.*?)(\[\/code\])+/ism","[code]$2[/code]", $s);
// Don't show link to full picture (until it is fixed)
$s = scale_external_images($s, false);
call_hooks('markdown_to_bb',$s);
return $s;
}
function stripdcode_br_cb($s) {
return '[code]' . str_replace('<br />', "\n\t", $s[1]) . '[/code]';
}
//////////////////////
// The following "diaspora_ul" and "diaspora_ol" are only appropriate for the
// pre-Markdownify conversion. If Markdownify isn't used, use the non-Markdownify
// versions below
//////////////////////
/*
function diaspora_ul($s) {
// Replace "[*]" followed by any number (including zero) of
// spaces by "* " to match Diaspora's list format
if( strpos($s[0], "[list]") === 0 )
return '<ul class="listbullet" style="list-style-type: circle;">' . preg_replace("/\[\*\]( *)/", "* ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[ul]") === 0 )
return '<ul class="listbullet" style="list-style-type: circle;">' . preg_replace("/\[\*\]( *)/", "* ", $s[1]) . '</ul>';
else
return $s[0];
}
function diaspora_ol($s) {
// A hack: Diaspora will create a properly-numbered ordered list even
// if you use '1.' for each element of the list, like:
// 1. First element
// 1. Second element
// 1. Third element
if( strpos($s[0], "[list=1]") === 0 )
return '<ul class="listdecimal" style="list-style-type: decimal;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=i]") === 0 )
return '<ul class="listlowerroman" style="list-style-type: lower-roman;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=I]") === 0 )
return '<ul class="listupperroman" style="list-style-type: upper-roman;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=a]") === 0 )
return '<ul class="listloweralpha" style="list-style-type: lower-alpha;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[list=A]") === 0 )
return '<ul class="listupperalpha" style="list-style-type: upper-alpha;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
elseif( strpos($s[0], "[ol]") === 0 )
return '<ul class="listdecimal" style="list-style-type: decimal;">' . preg_replace("/\[\*\]( *)/", "1. ", $s[1]) . '</ul>';
else
return $s[0];
}
*/
//////////////////////
// Non-Markdownify versions of "diaspora_ol" and "diaspora_ul"
//////////////////////
/**
* @brief
*
* Replace "[\\*]" followed by any number (including zero) of
* spaces by "* " to match Diaspora's list format.
*
* @param string $s
* @return string
*/
function diaspora_ul($s) {
return preg_replace("/\[\\\\\*\]( *)/", "* ", $s[1]);
}
/**
* @brief
*
* A hack: Diaspora will create a properly-numbered ordered list even
* if you use '1.' for each element of the list, like:
* \code
* 1. First element
* 1. Second element
* 1. Third element
* \endcode
* @param string $s
* @return string
*/
function diaspora_ol($s) {
return preg_replace("/\[\\\\\*\]( *)/", "1. ", $s[1]);
}
function bb2dmention_callback($match) {
$r = q("select xchan_addr from xchan where xchan_url = '%s'",
dbesc($match[2])
);
if($r)
return '@{' . $match[3] . ' ; ' . $r[0]['xchan_addr'] . '}';
return '@' . $match[3];
}
function bb2diaspora_itemwallwall(&$item,$uplink = false) {
// We will provide wallwall (embedded author on the Diaspora side) if
// 1. It is a wall-to-wall post
// 2. A comment arrived which has no Diaspora signature info
$wallwall = false;
$author_exists = true;
if(! array_key_exists('author',$item)) {
$author_exists = false;
logger('bb2diaspora_itemwallwall: no author');
$r = q("select * from xchan where xchan_hash = '%s' limit 1",
dbesc($item['author_xchan'])
);
if($r)
$item['author'] = $r[0];
}
$has_meta = false;
if($item['diaspora_meta'] || get_iconfig($item,'diaspora','fields'))
$has_meta = true;
if($item['author_xchan'] != $item['owner_xchan']) {
if($item['mid'] == $item['parent_mid'])
$wallwall = true;
else {
if(! $has_meta) {
$wallwall = true;
}
}
}
if($uplink)
$wallwall = true;
if(($wallwall) && (is_array($item['author'])) && $item['author']['xchan_url'] && $item['author']['xchan_name'] && $item['author']['xchan_photo_s']) {
logger('bb2diaspora_itemwallwall: wall to wall post',LOGGER_DEBUG);
// post will come across with the owner's identity. Throw a preamble onto the post to indicate the true author.
$item['body'] = "\n\n"
. '[quote]'
. '[img]' . $item['author']['xchan_photo_s'] . '[/img]'
. ' '
. '[url=' . $item['author']['xchan_url'] . '][b]' . $item['author']['xchan_name'] . '[/b][/url]' . "\n\n"
. $item['body']
. '[/quote]';
}
// $item['author'] might cause a surprise further down the line if it wasn't expected to be here.
if(! $author_exists)
unset($item['author']);
}
function bb2diaspora_itembody($item, $force_update = false, $have_channel = false, $uplink = false) {
if(! get_iconfig($item,'diaspora','fields')) {
$force_update = true;
}
$matches = array();
if(($item['diaspora_meta']) && (! $force_update)) {
$diaspora_meta = json_decode($item['diaspora_meta'],true);
if($diaspora_meta) {
if(array_key_exists('iv',$diaspora_meta)) {
$key = get_config('system','prvkey');
$meta = json_decode(crypto_unencapsulate($diaspora_meta,$key),true);
}
else {
$meta = $diaspora_meta;
}
if($meta) {
logger('bb2diaspora_itembody: cached ');
$newitem = $item;
$newitem['body'] = $meta['body'];
return $newitem['body'];
}
}
}
create_export_photo_body($item);
$newitem = $item;
if(array_key_exists('item_obscured',$item) && intval($item['item_obscured'])) {
$key = get_config('system','prvkey');
$b = json_decode($item['body'],true);
// if called from diaspora_process_outbound, this decoding has already been done.
// Everything else that calls us will not yet be decoded.
if($b && is_array($b) && array_key_exists('iv',$b)) {
$newitem['title'] = (($item['title']) ? crypto_unencapsulate(json_decode($item['title'],true),$key) : '');
$newitem['body'] = (($item['body']) ? crypto_unencapsulate(json_decode($item['body'],true),$key) : '');
}
}
if(! $have_channel)
bb2diaspora_itemwallwall($newitem,$uplink);
$title = $newitem['title'];
$body = preg_replace('/\#\^http/i', 'http', $newitem['body']);
// protect tags and mentions from hijacking
if(intval(get_pconfig($item['uid'],'system','prevent_tag_hijacking'))) {
$new_tag = html_entity_decode('⋕',ENT_COMPAT,'UTF-8');
$new_mention = html_entity_decode('@',ENT_COMPAT,'UTF-8');
// #-tags
$body = preg_replace('/\#\[url/i', $new_tag . '[url', $body);
$body = preg_replace('/\#\[zrl/i', $new_tag . '[zrl', $body);
// @-mentions
$body = preg_replace('/\@\!?\[url/i', $new_mention . '[url', $body);
$body = preg_replace('/\@\!?\[zrl/i', $new_mention . '[zrl', $body);
}
// remove multiple newlines
do {
$oldbody = $body;
$body = str_replace("\n\n\n", "\n\n", $body);
} while ($oldbody != $body);
$body = bb2diaspora($body);
if(strlen($title))
$body = "## " . $title . "\n\n" . $body;
if($item['attach']) {
$cnt = preg_match_all('/href=\"(.*?)\"(.*?)title=\"(.*?)\"/ism', $item['attach'], $matches, PREG_SET_ORDER);
if($cnt) {
$body .= "\n" . t('Attachments:') . "\n";
foreach($matches as $mtch) {
$body .= '[' . $mtch[3] . '](' . $mtch[1] . ')' . "\n";
}
}
}
// logger('bb2diaspora_itembody : ' . $body, LOGGER_DATA);
return html_entity_decode($body);
}
function bb2diaspora($Text, $preserve_nl = false, $fordiaspora = true) {
// Re-enabling the converter again.
// The bbcode parser now handles youtube-links (and the other stuff) correctly.
// Additionally the html code is now fixed so that lists are now working.
/*
* Transform #tags, strip off the [url] and replace spaces with underscore
*/
$Text = preg_replace_callback('/#\[([zu])rl\=(\w+.*?)\](\w+.*?)\[\/[(zu)]rl\]/i', create_function('$match',
'return \'#\'. str_replace(\' \', \'_\', $match[3]);'
), $Text);
$Text = preg_replace('/#\^\[([zu])rl\=(\w+.*?)\](\w+.*?)\[\/([zu])rl\]/i', '[$1rl=$2]$3[/$4rl]', $Text);
$Text = preg_replace_callback('/\@\!?\[([zu])rl\=(\w+.*?)\](\w+.*?)\[\/([zu])rl\]/i', 'bb2dmention_callback', $Text);
// strip map tags, as the rendering is performed in bbcode() and the resulting output
// is not compatible with Diaspora (at least in the case of openstreetmap and probably
// due to the inclusion of an html iframe)
$Text = preg_replace("/\[map\=(.*?)\]/ism", '$1', $Text);
$Text = preg_replace("/\[map\](.*?)\[\/map\]/ism", '$1', $Text);
// Converting images with size parameters to simple images. Markdown doesn't know it.
$Text = preg_replace("/\[img\=([0-9]*)x([0-9]*)\](.*?)\[\/img\]/ism", '[img]$3[/img]', $Text);
// the following was added on 10-January-2012 due to an inability of Diaspora's
// new javascript markdown processor to handle links with images as the link "text"
// It is not optimal and may be removed if this ability is restored in the future
//if ($fordiaspora)
// $Text = preg_replace("/\[url\=([^\[\]]*)\]\s*\[img\](.*?)\[\/img\]\s*\[\/url\]/ism",
// "[url]$1[/url]\n[img]$2[/img]", $Text);
// Convert it to HTML - don't try oembed
$Text = bbcode($Text, $preserve_nl, false);
// Markdownify does not preserve previously escaped html entities such as <> and &.
$Text = str_replace(array('<','>','&'),array('&_lt_;','&_gt_;','&_amp_;'),$Text);
// Now convert HTML to Markdown
$md = new HtmlConverter();
$Text = $md->convert($Text);
// It also adds backslashes to our attempt at getting around the html entity preservation for some weird reason.
$Text = str_replace(array('&\\_lt\\_;','&\\_gt\\_;','&\\_amp\\_;'),array('<','>','&'),$Text);
// If the text going into bbcode() has a plain URL in it, i.e.
// with no [url] tags around it, it will come out of parseString()
// looking like: <http://url.com>, which gets removed by strip_tags().
// So take off the angle brackets of any such URL
$Text = preg_replace("/<http(.*?)>/is", "http$1", $Text);
// Remove empty zrl links
$Text = preg_replace("/\[zrl\=\].*?\[\/zrl\]/is", "", $Text);
// Remove all unconverted tags
$Text = strip_tags($Text);
// Remove any leading or trailing whitespace, as this will mess up
// the Diaspora signature verification and cause the item to disappear
$Text = trim($Text);
call_hooks('bb2diaspora', $Text);
return $Text;
}
function unescape_underscores_in_links($m) {
$y = str_replace('\\_','_', $m[2]);
return('[' . $m[1] . '](' . $y . ')');
}
function format_event_diaspora($ev) {
if(! ((is_array($ev)) && count($ev)))
return '';
$bd_format = t('l F d, Y \@ g:i A') ; // Friday January 18, 2011 @ 8 AM
$o = t('$Projectname event notification:') . "\n";
$o .= '**' . (($ev['summary']) ? bb2diaspora($ev['summary']) : bb2diaspora($ev['desc'])) . '**' . "\n";
$o .= t('Starts:') . ' ' . '['
. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC',
$ev['start'] , $bd_format ))
: day_translate(datetime_convert('UTC', 'UTC',
$ev['start'] , $bd_format)))
. '](' . z_root() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['start'])) . ")\n";
if(! $ev['nofinish'])
$o .= t('Finishes:') . ' ' . '['
. (($ev['adjust']) ? day_translate(datetime_convert('UTC', 'UTC',
$ev['finish'] , $bd_format ))
: day_translate(datetime_convert('UTC', 'UTC',
$ev['finish'] , $bd_format )))
. '](' . z_root() . '/localtime/?f=&time=' . urlencode(datetime_convert('UTC','UTC',$ev['finish'])) . ")\n";
if(strlen($ev['location']))
$o .= t('Location:') . bb2diaspora($ev['location'])
. "\n";
$o .= "\n";
return $o;
}