include/oembed.php

   1 <?php
   2
   3 /**
   4  * @file include/oembed.php
   5  */
   6
   7 use Friendica\App;
   8 use Friendica\ParseUrl;
   9 use Friendica\Core\Config;
  10
  11 function oembed_replacecb($matches){
  12         $embedurl=$matches[1];
  13         $j = oembed_fetch_url($embedurl);
  14         $s =  oembed_format_object($j);
  15
  16         return $s;
  17 }
  18
  19 /**
  20  * @brief Get data from an URL to embed its content.
  21  *
  22  * @param string $embedurl The URL from which the data should be fetched.
  23  * @param bool $no_rich_type If set to true rich type content won't be fetched.
  24  *
  25  * @return bool|object Returns object with embed content or false if no embedable
  26  *       content exists
  27  */
  28 function oembed_fetch_url($embedurl, $no_rich_type = false){
  29         $embedurl = trim($embedurl, "'");
  30         $embedurl = trim($embedurl, '"');
  31
  32         $a = get_app();
  33
  34         $r = q("SELECT * FROM `oembed` WHERE `url` = '%s'",
  35                 dbesc(normalise_link($embedurl)));
  36
  37         if (dbm::is_result($r)) {
  38                 $txt = $r[0]["content"];
  39         } else {
  40                 $txt = Cache::get($a->videowidth . $embedurl);
  41         }
  42         // These media files should now be caught in bbcode.php
  43         // left here as a fallback in case this is called from another source
  44
  45         $noexts = array("mp3", "mp4", "ogg", "ogv", "oga", "ogm", "webm");
  46         $ext = pathinfo(strtolower($embedurl), PATHINFO_EXTENSION);
  47
  48
  49         if (is_null($txt)) {
  50                 $txt = "";
  51
  52                 if (!in_array($ext, $noexts)){
  53                         // try oembed autodiscovery
  54                         $redirects = 0;
  55                         $html_text = fetch_url($embedurl, false, $redirects, 15, "text/*");
  56                         if ($html_text) {
  57                                 $dom = @DOMDocument::loadHTML($html_text);
  58                                 if ($dom) {
  59                                         $xpath = new DOMXPath($dom);
  60                                         $attr = "oembed";
  61                                         $xattr = oe_build_xpath("class","oembed");
  62                                         $entries = $xpath->query("//link[@type='application/json+oembed']");
  63                                         foreach ($entries as $e) {
  64                                                 $href = $e->getAttributeNode("href")->nodeValue;
  65                                                 $txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
  66                                                 break;
  67                                         }
  68                                         $entries = $xpath->query("//link[@type='text/json+oembed']");
  69                                         foreach ($entries as $e) {
  70                                                 $href = $e->getAttributeNode("href")->nodeValue;
  71                                                 $txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
  72                                                 break;
  73                                         }
  74                                 }
  75                         }
  76                 }
  77
  78                 $txt = trim($txt);
  79
  80                 if ($txt[0] != "{") {
  81                         $txt = '{"type":"error"}';
  82                 } else {        //save in cache
  83                         $j = json_decode($txt);
  84                         if ($j->type != "error") {
  85                                 q("INSERT INTO `oembed` (`url`, `content`, `created`) VALUES ('%s', '%s', '%s')
  86                                         ON DUPLICATE KEY UPDATE `content` = '%s', `created` = '%s'",
  87                                         dbesc(normalise_link($embedurl)),
  88                                         dbesc($txt), dbesc(datetime_convert()),
  89                                         dbesc($txt), dbesc(datetime_convert()));
  90                         }
  91
  92                         Cache::set($a->videowidth.$embedurl, $txt, CACHE_DAY);
  93                 }
  94         }
  95
  96         $j = json_decode($txt);
  97
  98         if (!is_object($j)) {
  99                 return false;
 100         }
 101
 102         // Always embed the SSL version
 103         if (isset($j->html)) {
 104                 $j->html = str_replace(array("http://www.youtube.com/", "http://player.vimeo.com/"),
 105                         array("https://www.youtube.com/", "https://player.vimeo.com/"), $j->html);
 106         }
 107
 108         $j->embedurl = $embedurl;
 109
 110         // If fetching information doesn't work, then improve via internal functions
 111         if (($j->type == "error") || ($no_rich_type && ($j->type == "rich"))) {
 112                 $data = ParseUrl::getSiteinfoCached($embedurl, true, false);
 113                 $j->type = $data["type"];
 114
 115                 if ($j->type == "photo") {
 116                         $j->url = $data["url"];
 117                         //$j->width = $data["images"][0]["width"];
 118                         //$j->height = $data["images"][0]["height"];
 119                 }
 120
 121                 if (isset($data["title"])) {
 122                         $j->title = $data["title"];
 123                 }
 124
 125                 if (isset($data["text"])) {
 126                         $j->description = $data["text"];
 127                 }
 128
 129                 if (is_array($data["images"])) {
 130                         $j->thumbnail_url = $data["images"][0]["src"];
 131                         $j->thumbnail_width = $data["images"][0]["width"];
 132                         $j->thumbnail_height = $data["images"][0]["height"];
 133                 }
 134         }
 135
 136         call_hooks('oembed_fetch_url', $embedurl, $j);
 137
 138         return $j;
 139 }
 140
 141 function oembed_format_object($j){
 142         require_once("mod/proxy.php");
 143
 144         $embedurl = $j->embedurl;
 145         $jhtml = oembed_iframe($j->embedurl,(isset($j->width) ? $j->width : null), (isset($j->height) ? $j->height : null) );
 146         $ret="<span class='oembed ".$j->type."'>";
 147         switch ($j->type) {
 148                 case "video":
 149                         if (isset($j->thumbnail_url)) {
 150                                 $tw = (isset($j->thumbnail_width) && intval($j->thumbnail_width)) ? $j->thumbnail_width:200;
 151                                 $th = (isset($j->thumbnail_height) && intval($j->thumbnail_height)) ? $j->thumbnail_height:180;
 152                                 // make sure we don't attempt divide by zero, fallback is a 1:1 ratio
 153                                 $tr = (($th) ? $tw/$th : 1);
 154
 155                                 $th=120; $tw = $th*$tr;
 156                                 $tpl=get_markup_template('oembed_video.tpl');
 157                                 $ret.=replace_macros($tpl, array(
 158                                         '$baseurl'     => App::get_baseurl(),
 159                                         '$embedurl'    => $embedurl,
 160                                         '$escapedhtml' => base64_encode($jhtml),
 161                                         '$tw'          => $tw,
 162                                         '$th'          => $th,
 163                                         '$turl'        => $j->thumbnail_url,
 164                                 ));
 165
 166                         } else {
 167                                 $ret=$jhtml;
 168                         }
 169                         //$ret.="<br>";
 170                         break;
 171                 case "photo":
 172                         $ret.= "<img width='".$j->width."' src='".proxy_url($j->url)."'>";
 173                         break;
 174                 case "link":
 175                         break;
 176                 case "rich":
 177                         // not so safe..
 178                         if (!Config::get("system","no_oembed_rich_content")) {
 179                                 $ret.= proxy_parse_html($jhtml);
 180                         }
 181                         break;
 182         }
 183
 184         // add link to source if not present in "rich" type
 185         if ($j->type!='rich' || !strpos($j->html,$embedurl) ){
 186                 $ret .= "<h4>";
 187                 if (isset($j->title)) {
 188                         if (isset($j->provider_name)) {
 189                                 $ret .= $j->provider_name.": ";
 190                         }
 191
 192                         $embedlink = (isset($j->title))?$j->title:$embedurl;
 193                         $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
 194                         if (isset($j->author_name)) {
 195                                 $ret.=" (".$j->author_name.")";
 196                         }
 197                 } elseif (isset($j->provider_name) || isset($j->author_name)) {
 198                         $embedlink = "";
 199                         if (isset($j->provider_name)) {
 200                                 $embedlink .= $j->provider_name;
 201                         }
 202
 203                         if (isset($j->author_name)) {
 204                                 if ($embedlink != "") {
 205                                         $embedlink .= ": ";
 206                                 }
 207
 208                                 $embedlink .= $j->author_name;
 209                         }
 210                         if (trim($embedlink) == "") {
 211                                 $embedlink = $embedurl;
 212                         }
 213
 214                         $ret .= "<a href='$embedurl' rel='oembed'>$embedlink</a>";
 215                 }
 216                 //if (isset($j->author_name)) $ret.=" by ".$j->author_name;
 217                 //if (isset($j->provider_name)) $ret.=" on ".$j->provider_name;
 218                 $ret .= "</h4>";
 219         } else {
 220                 // add <a> for html2bbcode conversion
 221                 $ret .= "<a href='$embedurl' rel='oembed'>$embedurl</a>";
 222         }
 223         $ret.="</span>";
 224         $ret = str_replace("\n","",$ret);
 225         return mb_convert_encoding($ret, 'HTML-ENTITIES', mb_detect_encoding($ret));
 226 }
 227
 228 /**
 229  * @brief Generates the iframe HTML for an oembed attachment.
 230  *
 231  * Width and height are given by the remote, and are regularly too small for
 232  * the generated iframe.
 233  *
 234  * The width is entirely discarded for the actual width of the post, while fixed
 235  * height is used as a starting point before the inevitable resizing.
 236  *
 237  * Since the iframe is automatically resized on load, there are no need for ugly
 238  * and impractical scrollbars.
 239  *
 240  * @param string $src Original remote URL to embed
 241  * @param string $width
 242  * @param string $height
 243  * @return string formatted HTML
 244  *
 245  * @see oembed_format_object()
 246  */
 247 function oembed_iframe($src, $width, $height) {
 248         $a = get_app();
 249
 250         if (!$height || strstr($height,'%')) {
 251                 $height = '200';
 252         }
 253         $width = '100%';
 254
 255         $s = App::get_baseurl() . '/oembed/' . base64url_encode($src);
 256         return '<iframe onload="resizeIframe(this);" class="embed_rich" height="' . $height . '" width="' . $width . '" src="' . $s . '" allowfullscreen scrolling="no" frameborder="no">' . t('Embedded content') . '</iframe>';
 257 }
 258
 259
 260
 261 function oembed_bbcode2html($text){
 262         $stopoembed = Config::get("system","no_oembed");
 263         if ($stopoembed == true){
 264                 return preg_replace("/\[embed\](.+?)\[\/embed\]/is", "<!-- oembed $1 --><i>". t('Embedding disabled') ." : $1</i><!-- /oembed $1 -->" ,$text);
 265         }
 266         return preg_replace_callback("/\[embed\](.+?)\[\/embed\]/is", 'oembed_replacecb' ,$text);
 267 }
 268
 269
 270 function oe_build_xpath($attr, $value){
 271         // http://westhoffswelt.de/blog/0036_xpath_to_select_html_by_class.html
 272         return "contains( normalize-space( @$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 = '$value'";
 273 }
 274
 275 function oe_get_inner_html($node) {
 276         $innerHTML= '';
 277         $children = $node->childNodes;
 278         foreach ($children as $child) {
 279                 $innerHTML .= $child->ownerDocument->saveXML($child);
 280         }
 281         return $innerHTML;
 282 }
 283
 284 /**
 285  * Find <span class='oembed'>..<a href='url' rel='oembed'>..</a></span>
 286  * and replace it with [embed]url[/embed]
 287  */
 288 function oembed_html2bbcode($text) {
 289         // start parser only if 'oembed' is in text
 290         if (strpos($text, "oembed")) {
 291
 292                 // convert non ascii chars to html entities
 293                 $html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
 294
 295                 // If it doesn't parse at all, just return the text.
 296                 $dom = @DOMDocument::loadHTML($html_text);
 297                 if (! $dom) {
 298                         return $text;
 299                 }
 300                 $xpath = new DOMXPath($dom);
 301                 $attr = "oembed";
 302
 303                 $xattr = oe_build_xpath("class","oembed");
 304                 $entries = $xpath->query("//span[$xattr]");
 305
 306                 $xattr = "@rel='oembed'";//oe_build_xpath("rel","oembed");
 307                 foreach ($entries as $e) {
 308                         $href = $xpath->evaluate("a[$xattr]/@href", $e)->item(0)->nodeValue;
 309                         if (!is_null($href)) {
 310                                 $e->parentNode->replaceChild(new DOMText("[embed]".$href."[/embed]"), $e);
 311                         }
 312                 }
 313                 return oe_get_inner_html( $dom->getElementsByTagName("body")->item(0) );
 314         } else {
 315                 return $text;
 316         }
 317 }