include/oembed.php

   1 <?php
   2
   3 /**
   4  * @file include/oembed.php
   5  */
   6
   7 use \Friendica\ParseUrl;
   8 use \Friendica\Core\Config;
   9
  10 function oembed_replacecb($matches){
  11         $embedurl=$matches[1];
  12         $j = oembed_fetch_url($embedurl);
  13         $s =  oembed_format_object($j);
  14
  15         return $s;
  16 }
  17
  18 /**
  19  * @brief Get data from an URL to embed its content.
  20  *
  21  * @param string $embedurl The URL from which the data should be fetched.
  22  * @param bool $no_rich_type If set to true rich type content won't be fetched.
  23  *
  24  * @return bool|object Returns object with embed content or false if no embedable
  25  *       content exists
  26  */
  27 function oembed_fetch_url($embedurl, $no_rich_type = false){
  28         $embedurl = trim($embedurl, "'");
  29         $embedurl = trim($embedurl, '"');
  30
  31         $a = get_app();
  32
  33         $r = q("SELECT * FROM `oembed` WHERE `url` = '%s'",
  34                 dbesc(normalise_link($embedurl)));
  35
  36         if (dbm::is_result($r)) {
  37                 $txt = $r[0]["content"];
  38         } else {
  39                 $txt = Cache::get($a->videowidth . $embedurl);
  40         }
  41         // These media files should now be caught in bbcode.php
  42         // left here as a fallback in case this is called from another source
  43
  44         $noexts = array("mp3", "mp4", "ogg", "ogv", "oga", "ogm", "webm");
  45         $ext = pathinfo(strtolower($embedurl), PATHINFO_EXTENSION);
  46
  47
  48         if (is_null($txt)) {
  49                 $txt = "";
  50
  51                 if (!in_array($ext, $noexts)){
  52                         // try oembed autodiscovery
  53                         $redirects = 0;
  54                         $html_text = fetch_url($embedurl, false, $redirects, 15, "text/*");
  55                         if ($html_text) {
  56                                 $dom = @DOMDocument::loadHTML($html_text);
  57                                 if ($dom) {
  58                                         $xpath = new DOMXPath($dom);
  59                                         $attr = "oembed";
  60                                         $xattr = oe_build_xpath("class","oembed");
  61                                         $entries = $xpath->query("//link[@type='application/json+oembed']");
  62                                         foreach ($entries as $e) {
  63                                                 $href = $e->getAttributeNode("href")->nodeValue;
  64                                                 $txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
  65                                                 break;
  66                                         }
  67                                         $entries = $xpath->query("//link[@type='text/json+oembed']");
  68                                         foreach ($entries as $e) {
  69                                                 $href = $e->getAttributeNode("href")->nodeValue;
  70                                                 $txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
  71                                                 break;
  72                                         }
  73                                 }
  74                         }
  75                 }
  76
  77                 $txt = trim($txt);
  78
  79                 if ($txt[0] != "{") {
  80                         $txt = '{"type":"error"}';
  81                 } else {        //save in cache
  82                         $j = json_decode($txt);
  83                         if ($j->type != "error") {
  84                                 q("INSERT INTO `oembed` (`url`, `content`, `created`) VALUES ('%s', '%s', '%s')
  85                                         ON DUPLICATE KEY UPDATE `content` = '%s', `created` = '%s'",
  86                                         dbesc(normalise_link($embedurl)),
  87                                         dbesc($txt), dbesc(datetime_convert()),
  88                                         dbesc($txt), dbesc(datetime_convert()));
  89                         }
  90
  91                         Cache::set($a->videowidth.$embedurl, $txt, CACHE_DAY);
  92                 }
  93         }
  94
  95         $j = json_decode($txt);
  96
  97         if (!is_object($j)) {
  98                 return false;
  99         }
 100
 101         // Always embed the SSL version
 102         if (isset($j->html)) {
 103                 $j->html = str_replace(array("http://www.youtube.com/", "http://player.vimeo.com/"),
 104                         array("https://www.youtube.com/", "https://player.vimeo.com/"), $j->html);
 105         }
 106
 107         $j->embedurl = $embedurl;
 108
 109         // If fetching information doesn't work, then improve via internal functions
 110         if (($j->type == "error") OR ($no_rich_type AND ($j->type == "rich"))) {
 111                 $data = ParseUrl::getSiteinfoCached($embedurl, true, false);
 112                 $j->type = $data["type"];
 113
 114                 if ($j->type == "photo") {
 115                         $j->url = $data["url"];
 116                         //$j->width = $data["images"][0]["width"];
 117                         //$j->height = $data["images"][0]["height"];
 118                 }
 119
 120                 if (isset($data["title"])) {
 121                         $j->title = $data["title"];
 122                 }
 123
 124                 if (isset($data["text"])) {
 125                         $j->description = $data["text"];
 126                 }
 127
 128                 if (is_array($data["images"])) {
 129                         $j->thumbnail_url = $data["images"][0]["src"];
 130                         $j->thumbnail_width = $data["images"][0]["width"];
 131                         $j->thumbnail_height = $data["images"][0]["height"];
 132                 }
 133         }
 134
 135         call_hooks('oembed_fetch_url', $embedurl, $j);
 136
 137         return $j;
 138 }
 139
 140 function oembed_format_object($j){
 141         require_once("mod/proxy.php");
 142
 143         $embedurl = $j->embedurl;
 144         $jhtml = oembed_iframe($j->embedurl,(isset($j->width) ? $j->width : null), (isset($j->height) ? $j->height : null) );
 145         $ret="<span class='oembed ".$j->type."'>";
 146         switch ($j->type) {
 147                 case "video":
 148                         if (isset($j->thumbnail_url)) {
 149                                 $tw = (isset($j->thumbnail_width) && intval($j->thumbnail_width)) ? $j->thumbnail_width:200;
 150                                 $th = (isset($j->thumbnail_height) && intval($j->thumbnail_height)) ? $j->thumbnail_height:180;
 151                                 // make sure we don't attempt divide by zero, fallback is a 1:1 ratio
 152                                 $tr = (($th) ? $tw/$th : 1);
 153
 154                                 $th=120; $tw = $th*$tr;
 155                                 $tpl=get_markup_template('oembed_video.tpl');
 156                                 $ret.=replace_macros($tpl, array(
 157                                         '$baseurl'     => App::get_baseurl(),
 158                                         '$embedurl'    => $embedurl,
 159                                         '$escapedhtml' => base64_encode($jhtml),
 160                                         '$tw'          => $tw,
 161                                         '$th'          => $th,
 162                                         '$turl'        => $j->thumbnail_url,
 163                                 ));
 164
 165                         } else {
 166                                 $ret=$jhtml;
 167                         }
 168                         //$ret.="<br>";
 169                         break;
 170                 case "photo":
 171                         $ret.= "<img width='".$j->width."' src='".proxy_url($j->url)."'>";
 172                         break;
 173                 case "link":
 174                         break;
 175                 case "rich":
 176                         // not so safe..
 177                         if (!Config::get("system","no_oembed_rich_content")) {
 178                                 $ret.= proxy_parse_html($jhtml);
 179                         }
 180                         break;
 181         }
 182
 183         // add link to source if not present in "rich" type
 184         if ($j->type!='rich' || !strpos($j->html,$embedurl) ){
 185                 $ret .= "<h4>";
 186                 if (isset($j->title)) {
 187                         if (isset($j->provider_name)) {
 188                                 $ret .= $j->provider_name.": ";
 189                         }
 190
 191                         $embedlink = (isset($j->title))?$j->title:$embedurl;
 192                         $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
 193                         if (isset($j->author_name)) {
 194                                 $ret.=" (".$j->author_name.")";
 195                         }
 196                 } elseif (isset($j->provider_name) OR isset($j->author_name)) {
 197                         $embedlink = "";
 198                         if (isset($j->provider_name)) {
 199                                 $embedlink .= $j->provider_name;
 200                         }
 201
 202                         if (isset($j->author_name)) {
 203                                 if ($embedlink != "") {
 204                                         $embedlink .= ": ";
 205                                 }
 206
 207                                 $embedlink .= $j->author_name;
 208                         }
 209                         if (trim($embedlink) == "") {
 210                                 $embedlink = $embedurl;
 211                         }
 212
 213                         $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
 214                 }
 215                 //if (isset($j->author_name)) $ret.=" by ".$j->author_name;
 216                 //if (isset($j->provider_name)) $ret.=" on ".$j->provider_name;
 217                 $ret .= "</h4>";
 218         } else {
 219                 // add <a> for html2bbcode conversion
 220                 $ret .= "<a href='$embedurl' rel='oembed'>$embedurl</a>";
 221         }
 222         $ret.="</span>";
 223         $ret = str_replace("\n","",$ret);
 224         return mb_convert_encoding($ret, 'HTML-ENTITIES', mb_detect_encoding($ret));
 225 }
 226
 227 /**
 228  * @brief Generates the iframe HTML for an oembed attachment.
 229  *
 230  * Width and height are given by the remote, and are regularly too small for
 231  * the generated iframe.
 232  *
 233  * The width is entirely discarded for the actual width of the post, while fixed
 234  * height is used as a starting point before the inevitable resizing.
 235  *
 236  * Since the iframe is automatically resized on load, there are no need for ugly
 237  * and impractical scrollbars.
 238  *
 239  * @param string $src Original remote URL to embed
 240  * @param string $width
 241  * @param string $height
 242  * @return string formatted HTML
 243  *
 244  * @see oembed_format_object()
 245  */
 246 function oembed_iframe($src, $width, $height) {
 247         $a = get_app();
 248
 249         if (!$height || strstr($height,'%')) {
 250                 $height = '200';
 251         }
 252         $width = '100%';
 253
 254         $s = App::get_baseurl() . '/oembed/' . base64url_encode($src);
 255         return '<iframe onload="resizeIframe(this);" class="embed_rich" height="' . $height . '" width="' . $width . '" src="' . $s . '" allowfullscreen scrolling="no" frameborder="no">' . t('Embedded content') . '</iframe>';
 256 }
 257
 258
 259
 260 function oembed_bbcode2html($text){
 261         $stopoembed = Config::get("system","no_oembed");
 262         if ($stopoembed == true){
 263                 return preg_replace("/\[embed\](.+?)\[\/embed\]/is", "<!-- oembed $1 --><i>". t('Embedding disabled') ." : $1</i><!-- /oembed $1 -->" ,$text);
 264         }
 265         return preg_replace_callback("/\[embed\](.+?)\[\/embed\]/is", 'oembed_replacecb' ,$text);
 266 }
 267
 268
 269 function oe_build_xpath($attr, $value){
 270         // http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html
 271         return "contains( normalize-space( @$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 = '$value'";
 272 }
 273
 274 function oe_get_inner_html($node) {
 275         $innerHTML= '';
 276         $children = $node->childNodes;
 277         foreach ($children as $child) {
 278                 $innerHTML .= $child->ownerDocument->saveXML($child);
 279         }
 280         return $innerHTML;
 281 }
 282
 283 /**
 284  * Find <span class='oembed'>..<a href='url' rel='oembed'>..</a></span>
 285  * and replace it with [embed]url[/embed]
 286  */
 287 function oembed_html2bbcode($text) {
 288         // start parser only if 'oembed' is in text
 289         if (strpos($text, "oembed")) {
 290
 291                 // convert non ascii chars to html entities
 292                 $html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
 293
 294                 // If it doesn't parse at all, just return the text.
 295                 $dom = @DOMDocument::loadHTML($html_text);
 296                 if (! $dom) {
 297                         return $text;
 298                 }
 299                 $xpath = new DOMXPath($dom);
 300                 $attr = "oembed";
 301
 302                 $xattr = oe_build_xpath("class","oembed");
 303                 $entries = $xpath->query("//span[$xattr]");
 304
 305                 $xattr = "@rel='oembed'";//oe_build_xpath("rel","oembed");
 306                 foreach($entries as $e) {
 307                         $href = $xpath->evaluate("a[$xattr]/@href", $e)->item(0)->nodeValue;
 308                         if(!is_null($href)) $e->parentNode->replaceChild(new DOMText("[embed]".$href."[/embed]"), $e);
 309                 }
 310                 return oe_get_inner_html( $dom->getElementsByTagName("body")->item(0) );
 311         } else {
 312                 return $text;
 313         }
 314 }