include/oembed.php

   1 <?php
   2 function oembed_replacecb($matches){
   3         $embedurl=$matches[1];
   4         $j = oembed_fetch_url($embedurl);
   5         $s =  oembed_format_object($j);
   6         return $s;
   7 }
   8
   9 /**
  10  * @brief Get data from an URL to embed its content.
  11  *
  12  * @param string $embedurl The URL from which the data should be fetched.
  13  * @param bool $no_rich_type If set to true rich type content won't be fetched.
  14  *
  15  * @return bool|object Returns object with embed content or false if no embedable
  16  *       content exists
  17  */
  18 function oembed_fetch_url($embedurl, $no_rich_type = false){
  19         $embedurl = trim($embedurl, "'");
  20         $embedurl = trim($embedurl, '"');
  21
  22         $a = get_app();
  23
  24         $r = q("SELECT * FROM `oembed` WHERE `url` = '%s'",
  25                 dbesc(normalise_link($embedurl)));
  26
  27         if (dbm::is_result($r)) {
  28                 $txt = $r[0]["content"];
  29         } else {
  30                 $txt = Cache::get($a->videowidth . $embedurl);
  31         }
  32         // These media files should now be caught in bbcode.php
  33         // left here as a fallback in case this is called from another source
  34
  35         $noexts = array("mp3","mp4","ogg","ogv","oga","ogm","webm");
  36         $ext = pathinfo(strtolower($embedurl),PATHINFO_EXTENSION);
  37
  38
  39         if (is_null($txt)) {
  40                 $txt = "";
  41
  42                 if (!in_array($ext, $noexts)){
  43                         // try oembed autodiscovery
  44                         $redirects = 0;
  45                         $html_text = fetch_url($embedurl, false, $redirects, 15, "text/*");
  46                         if ($html_text) {
  47                                 $dom = @DOMDocument::loadHTML($html_text);
  48                                 if ($dom) {
  49                                         $xpath = new DOMXPath($dom);
  50                                         $attr = "oembed";
  51                                         $xattr = oe_build_xpath("class","oembed");
  52                                         $entries = $xpath->query("//link[@type='application/json+oembed']");
  53                                         foreach ($entries as $e) {
  54                                                 $href = $e->getAttributeNode("href")->nodeValue;
  55                                                 $txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
  56                                                 break;
  57                                         }
  58                                         $entries = $xpath->query("//link[@type='text/json+oembed']");
  59                                         foreach ($entries as $e) {
  60                                                 $href = $e->getAttributeNode("href")->nodeValue;
  61                                                 $txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
  62                                                 break;
  63                                         }
  64                                 }
  65                         }
  66                 }
  67
  68                 if ($txt==false || $txt=="") {
  69                         $embedly = get_config("system", "embedly");
  70                         if ($embedly != "") {
  71                                 // try embedly service
  72                                 $ourl = "https://api.embed.ly/1/oembed?key=".$embedly."&url=".urlencode($embedurl);
  73                                 $txt = fetch_url($ourl);
  74
  75                                 logger("oembed_fetch_url: ".$txt, LOGGER_DEBUG);
  76                         }
  77                 }
  78
  79                 $txt=trim($txt);
  80
  81                 if ($txt[0]!="{") {
  82                         $txt='{"type":"error"}';
  83                 } else {        //save in cache
  84                         $j = json_decode($txt);
  85                         if ($j->type != "error") {
  86                                 q("INSERT INTO `oembed` (`url`, `content`, `created`) VALUES ('%s', '%s', '%s')
  87                                         ON DUPLICATE KEY UPDATE `content` = '%s', `created` = '%s'",
  88                                         dbesc(normalise_link($embedurl)),
  89                                         dbesc($txt), dbesc(datetime_convert()),
  90                                         dbesc($txt), dbesc(datetime_convert()));
  91                         }
  92
  93                         Cache::set($a->videowidth.$embedurl, $txt, CACHE_DAY);
  94                 }
  95         }
  96
  97         $j = json_decode($txt);
  98
  99         if (!is_object($j)) {
 100                 return false;
 101         }
 102
 103         // Always embed the SSL version
 104         if (isset($j->html)) {
 105                 $j->html = str_replace(array("http://www.youtube.com/", "http://player.vimeo.com/"),
 106                         array("https://www.youtube.com/", "https://player.vimeo.com/"), $j->html);
 107         }
 108
 109         $j->embedurl = $embedurl;
 110
 111         // If fetching information doesn't work, then improve via internal functions
 112         if (($j->type == "error") OR ($no_rich_type AND ($j->type == "rich"))) {
 113                 require_once("mod/parse_url.php");
 114                 $data = parseurl_getsiteinfo_cached($embedurl, true, false);
 115                 $j->type = $data["type"];
 116
 117                 if ($j->type == "photo") {
 118                         $j->url = $data["url"];
 119                         //$j->width = $data["images"][0]["width"];
 120                         //$j->height = $data["images"][0]["height"];
 121                 }
 122
 123                 if (isset($data["title"])) {
 124                         $j->title = $data["title"];
 125                 }
 126
 127                 if (isset($data["text"])) {
 128                         $j->description = $data["text"];
 129                 }
 130
 131                 if (is_array($data["images"])) {
 132                         $j->thumbnail_url = $data["images"][0]["src"];
 133                         $j->thumbnail_width = $data["images"][0]["width"];
 134                         $j->thumbnail_height = $data["images"][0]["height"];
 135                 }
 136         }
 137
 138         call_hooks('oembed_fetch_url', $embedurl, $j);
 139
 140         return $j;
 141 }
 142
 143 function oembed_format_object($j){
 144         require_once("mod/proxy.php");
 145
 146         $a = get_app();
 147         $embedurl = $j->embedurl;
 148         $jhtml = oembed_iframe($j->embedurl,(isset($j->width) ? $j->width : null), (isset($j->height) ? $j->height : null) );
 149         $ret="<span class='oembed ".$j->type."'>";
 150         switch ($j->type) {
 151                 case "video": {
 152                         if (isset($j->thumbnail_url)) {
 153                                 $tw = (isset($j->thumbnail_width) && intval($j->thumbnail_width)) ? $j->thumbnail_width:200;
 154                                 $th = (isset($j->thumbnail_height) && intval($j->thumbnail_height)) ? $j->thumbnail_height:180;
 155                                 // make sure we don't attempt divide by zero, fallback is a 1:1 ratio
 156                                 $tr = (($th) ? $tw/$th : 1);
 157
 158                                 $th=120; $tw = $th*$tr;
 159                                 $tpl=get_markup_template('oembed_video.tpl');
 160                                 $ret.=replace_macros($tpl, array(
 161                                 '$baseurl' => $a->get_baseurl(),
 162                                         '$embedurl'=>$embedurl,
 163                                         '$escapedhtml'=>base64_encode($jhtml),
 164                                         '$tw'=>$tw,
 165                                         '$th'=>$th,
 166                                         '$turl'=>$j->thumbnail_url,
 167                                 ));
 168
 169                         } else {
 170                                 $ret=$jhtml;
 171                         }
 172                         //$ret.="<br>";
 173                 }; break;
 174                 case "photo": {
 175                         $ret.= "<img width='".$j->width."' src='".proxy_url($j->url)."'>";
 176                 }; break;
 177                 case "link": {
 178                 }; break;
 179                 case "rich": {
 180                         // not so safe..
 181                         if (!get_config("system","no_oembed_rich_content"))
 182                                 $ret.= proxy_parse_html($jhtml);
 183                 }; break;
 184         }
 185
 186         // add link to source if not present in "rich" type
 187         if ($j->type!='rich' || !strpos($j->html,$embedurl) ){
 188                 $ret .= "<h4>";
 189                 if (isset($j->title)) {
 190                         if (isset($j->provider_name))
 191                                 $ret .= $j->provider_name.": ";
 192
 193                         $embedlink = (isset($j->title))?$j->title:$embedurl;
 194                         $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
 195                         if (isset($j->author_name))
 196                                 $ret.=" (".$j->author_name.")";
 197                 } elseif (isset($j->provider_name) OR isset($j->author_name)) {
 198                         $embedlink = "";
 199                         if (isset($j->provider_name))
 200                                 $embedlink .= $j->provider_name;
 201
 202                         if (isset($j->author_name)) {
 203                                 if ($embedlink != "")
 204                                         $embedlink .= ": ";
 205
 206                                 $embedlink .= $j->author_name;
 207                         }
 208                         if (trim($embedlink) == "")
 209                                 $embedlink = $embedurl;
 210
 211                         $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
 212                 }
 213                 //if (isset($j->author_name)) $ret.=" by ".$j->author_name;
 214                 //if (isset($j->provider_name)) $ret.=" on ".$j->provider_name;
 215                 $ret .= "</h4>";
 216         } else {
 217                 // add <a> for html2bbcode conversion
 218                 $ret .= "<a href='$embedurl' rel='oembed'>$embedurl</a>";
 219         }
 220         $ret.="</span>";
 221         $ret = str_replace("\n","",$ret);
 222         return mb_convert_encoding($ret, 'HTML-ENTITIES', mb_detect_encoding($ret));
 223 }
 224
 225 /**
 226  * @brief Generates the iframe HTML for an oembed attachment.
 227  *
 228  * Width and height are given by the remote, and are regularly too small for
 229  * the generated iframe.
 230  *
 231  * The width is entirely discarded for the actual width of the post, while fixed
 232  * height is used as a starting point before the inevitable resizing.
 233  *
 234  * Since the iframe is automatically resized on load, there are no need for ugly
 235  * and impractical scrollbars.
 236  *
 237  * @param string $src Original remote URL to embed
 238  * @param string $width
 239  * @param string $height
 240  * @return string formatted HTML
 241  *
 242  * @see oembed_format_object()
 243  */
 244 function oembed_iframe($src, $width, $height) {
 245         if (!$height || strstr($height,'%')) {
 246                 $height = '200';
 247         }
 248         $width = '100%';
 249
 250         $a = get_app();
 251         $s = $a->get_baseurl() . '/oembed/'.base64url_encode($src);
 252         return '<iframe onload="resizeIframe(this);" class="embed_rich" height="' . $height . '" width="' . $width . '" src="' . $s . '" scrolling="no" frameborder="no">' . t('Embedded content') . '</iframe>';
 253 }
 254
 255
 256
 257 function oembed_bbcode2html($text){
 258         $stopoembed = get_config("system","no_oembed");
 259         if ($stopoembed == true){
 260                 return preg_replace("/\[embed\](.+?)\[\/embed\]/is", "<!-- oembed $1 --><i>". t('Embedding disabled') ." : $1</i><!-- /oembed $1 -->" ,$text);
 261         }
 262         return preg_replace_callback("/\[embed\](.+?)\[\/embed\]/is", 'oembed_replacecb' ,$text);
 263 }
 264
 265
 266 function oe_build_xpath($attr, $value){
 267         // http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html
 268         return "contains( normalize-space( @$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'";
 269 }
 270
 271 function oe_get_inner_html( $node ) {
 272     $innerHTML= '';
 273     $children = $node->childNodes;
 274     foreach ($children as $child) {
 275         $innerHTML .= $child->ownerDocument->saveXML( $child );
 276     }
 277     return $innerHTML;
 278 }
 279
 280 /**
 281  * Find <span class='oembed'>..<a href='url' rel='oembed'>..</a></span>
 282  * and replace it with [embed]url[/embed]
 283  */
 284 function oembed_html2bbcode($text) {
 285         // start parser only if 'oembed' is in text
 286         if (strpos($text, "oembed")){
 287
 288                 // convert non ascii chars to html entities
 289                 $html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
 290
 291                 // If it doesn't parse at all, just return the text.
 292                 $dom = @DOMDocument::loadHTML($html_text);
 293                 if(! $dom)
 294                         return $text;
 295                 $xpath = new DOMXPath($dom);
 296                 $attr = "oembed";
 297
 298                 $xattr = oe_build_xpath("class","oembed");
 299                 $entries = $xpath->query("//span[$xattr]");
 300
 301                 $xattr = "@rel='oembed'";//oe_build_xpath("rel","oembed");
 302                 foreach($entries as $e) {
 303                         $href = $xpath->evaluate("a[$xattr]/@href", $e)->item(0)->nodeValue;
 304                         if(!is_null($href)) $e->parentNode->replaceChild(new DOMText("[embed]".$href."[/embed]"), $e);
 305                 }
 306                 return oe_get_inner_html( $dom->getElementsByTagName("body")->item(0) );
 307         } else {
 308                 return $text;
 309         }
 310 }