include/oembed.php

   1 <?php
   2 function oembed_replacecb($matches){
   3         $embedurl=$matches[1];
   4         $j = oembed_fetch_url($embedurl);
   5         return oembed_format_object($j);
   6 }
   7
   8
   9 function oembed_fetch_url($embedurl){
  10
  11         $txt = Cache::get($embedurl);
  12
  13         if(is_null($txt)){
  14                 $txt = "";
  15
  16                 // try oembed autodiscovery
  17                 $redirects = 0;
  18                 $html_text = fetch_url($embedurl, false, $redirects, 15);
  19                 if(! $html_text)
  20                         return;
  21                 $dom = @DOMDocument::loadHTML($html_text);
  22                 if ($dom){
  23                         $xpath = new DOMXPath($dom);
  24                         $attr = "oembed";
  25
  26                         $xattr = oe_build_xpath("class","oembed");
  27                         $entries = $xpath->query("//link[@type='application/json+oembed']");
  28                         foreach($entries as $e){
  29                                 $href = $e->getAttributeNode("href")->nodeValue;
  30                                 $txt = fetch_url($href);
  31                         }
  32                 }
  33
  34                 if ($txt==false || $txt==""){
  35                         // try oohembed service
  36                         $ourl = "http://oohembed.com/oohembed/?url=".urlencode($embedurl);
  37                         $txt = fetch_url($ourl);
  38                 }
  39
  40                 $txt=trim($txt);
  41                 if ($txt[0]!="{") $txt='{"type":"error"}';
  42
  43                 //save in cache
  44                 Cache::set($embedurl,$txt);
  45
  46         }
  47
  48         $j = json_decode($txt);
  49         $j->embedurl = $embedurl;
  50         return $j;
  51 }
  52
  53 function oembed_format_object($j){
  54         $embedurl = $j->embedurl;
  55         $ret="<span class='oembed ".$j->type."'>";
  56         switch ($j->type) {
  57                 case "video": {
  58                         if (isset($j->thumbnail_url)) {
  59                                 /*$tw = (isset($j->thumbnail_width)) ? $j->thumbnail_width:200;
  60                                 $th = (isset($j->thumbnail_height)) ? $j->thumbnail_height:180;*/
  61                                 $tw=150; $th=120;
  62                                 $ret.= "<a href='".$embedurl."' onclick='this.innerHTML=unescape(\"".urlencode($j->html)."\").replace(/\+/g,\" \"); return false;' style='float:left; margin: 1em; '>";
  63                                 $ret.= "<img width='$tw' height='$th' src='".$j->thumbnail_url."'>";
  64                                 $ret.= "</a>";
  65                         } else {
  66                                 $ret=$j->html;
  67                         }
  68                         $ret.="<br>";
  69                 }; break;
  70                 case "photo": {
  71                         $ret.= "<img width='".$j->width."' height='".$j->height."' src='".$j->url."'>";
  72                         $ret.="<br>";
  73                 }; break;
  74                 case "link": {
  75                         //$ret = "<a href='".$embedurl."'>".$j->title."</a>";
  76                 }; break;
  77                 case "rich": {
  78                         // not so safe..
  79                         $ret.= $j->html;
  80                 }; break;
  81         }
  82
  83         // add link to source if not present in "rich" type
  84         if (  $j->type!='rich' || !strpos($ret,$embedurl) ){
  85                 $embedlink = (isset($j->title))?$j->title:$embedurl;
  86                 $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
  87                 if (isset($j->author_name)) $ret.=" by ".$j->author_name;
  88                 if (isset($j->provider_name)) $ret.=" on ".$j->provider_name;
  89         } else {
  90                 // add <a> for html2bbcode conversion
  91                 $ret .= "<a href='$embedurl' rel='oembed'/>";
  92         }
  93         $ret.="<br style='clear:left'></span>";
  94         return  mb_convert_encoding($ret, 'HTML-ENTITIES', mb_detect_encoding($ret));
  95 }
  96
  97 function oembed_bbcode2html($text){
  98         $stopoembed = get_config("system","no_oembed");
  99         if ($stopoembed == true){
 100                 return preg_replace("/\[embed\](.+?)\[\/embed\]/is", "<!-- oembed $1 --><i>". t('Embedding disabled') ." : $1</i><!-- /oembed $1 -->" ,$text);
 101         }
 102         return preg_replace_callback("/\[embed\](.+?)\[\/embed\]/is", 'oembed_replacecb' ,$text);
 103 }
 104
 105
 106 function oe_build_xpath($attr, $value){
 107         // http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html
 108         return "contains( normalize-space( @$attr ), ' $value ' ) or substring( normalize-space( @$attr ), 1, string-length( '$value' ) + 1 ) = '$value ' or substring( normalize-space( @$attr ), string-length( @$attr ) - string-length( '$value' ) ) = ' $value' or @$attr = '$value'";
 109 }
 110
 111 function oe_get_inner_html( $node ) {
 112     $innerHTML= '';
 113     $children = $node->childNodes;
 114     foreach ($children as $child) {
 115         $innerHTML .= $child->ownerDocument->saveXML( $child );
 116     }
 117     return $innerHTML;
 118 }
 119
 120 /**
 121  * Find <span class='oembed'>..<a href='url' rel='oembed'>..</a></span>
 122  * and replace it with [embed]url[/embed]
 123  */
 124 function oembed_html2bbcode($text) {
 125         // start parser only if 'oembed' is in text
 126         if (strpos($text, "oembed")){
 127
 128                 // convert non ascii chars to html entities
 129                 $html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
 130
 131                 // If it doesn't parse at all, just return the text.
 132                 $dom = @DOMDocument::loadHTML($html_text);
 133                 if(! $dom)
 134                         return $text;
 135                 $xpath = new DOMXPath($dom);
 136                 $attr = "oembed";
 137
 138                 $xattr = oe_build_xpath("class","oembed");
 139                 $entries = $xpath->query("//span[$xattr]");
 140
 141                 $xattr = "@rel='oembed'";//oe_build_xpath("rel","oembed");
 142                 foreach($entries as $e) {
 143                         $href = $xpath->evaluate("a[$xattr]/@href", $e)->item(0)->nodeValue;
 144                         if(!is_null($href)) $e->parentNode->replaceChild(new DOMText("[embed]".$href."[/embed]"), $e);
 145                 }
 146                 return oe_get_inner_html( $dom->getElementsByTagName("body")->item(0) );
 147         } else {
 148                 return $text;
 149         }
 150 }
 151
 152
 153