X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=src%2FContent%2FOEmbed.php;h=b09fd2249535a2914548bf3ef99020b279335aa8;hb=0a13ab6b9f81fe46698386a197e280859cb10f67;hp=50b8bb4e3545718493fd8d436fc8630868eb41b7;hpb=1fdde9b1403b41c27269b21f413a98bc62ff3c35;p=friendica.git

diff --git a/src/Content/OEmbed.php b/src/Content/OEmbed.php
index 50b8bb4e35..b09fd22495 100644
--- a/src/Content/OEmbed.php
+++ b/src/Content/OEmbed.php
@@ -1,398 +1,410 @@
-<?php
-
-/**
- * @file src/Content/OEmbed.php
- */
-
-namespace Friendica\Content;
-
-use Friendica\Core\Cache;
-use Friendica\Core\System;
-use Friendica\Core\Config;
-use Friendica\Database\DBM;
-use Friendica\Util\ParseUrl;
-use dba;
-use DOMDocument;
-use DOMXPath;
-use DOMNode;
-use Exception;
-
-require_once 'include/dba.php';
-require_once 'mod/proxy.php';
-
-/**
- * Handles all OEmbed content fetching and replacement
- *
- * OEmbed is a standard used to allow an embedded representation of a URL on
- * third party sites
- *
- * @see https://oembed.com
- *
- * @author Hypolite Petovan <mrpetovan@gmail.com>
- */
-class OEmbed
-{
-	public static function replaceCallback($matches)
-	{
-		$embedurl = $matches[1];
-		$j = self::fetchURL($embedurl);
-		$s = self::formatObject($j);
-
-		return $s;
-	}
-
-	/**
-	 * @brief Get data from an URL to embed its content.
-	 *
-	 * @param string $embedurl The URL from which the data should be fetched.
-	 * @param bool $no_rich_type If set to true rich type content won't be fetched.
-	 *
-	 * @return bool|object Returns object with embed content or false if no embedable
-	 * 	 content exists
-	 */
-	public static function fetchURL($embedurl, $no_rich_type = false)
-	{
-		$embedurl = trim($embedurl, "'");
-		$embedurl = trim($embedurl, '"');
-
-		$a = get_app();
-
-		$condition = array('url' => normalise_link($embedurl));
-		$r = dba::select('oembed', array('content'), $condition, array('limit' => 1));
-
-		if (DBM::is_result($r)) {
-			$txt = $r["content"];
-		} else {
-			$txt = Cache::get($a->videowidth . $embedurl);
-		}
-		// These media files should now be caught in bbcode.php
-		// left here as a fallback in case this is called from another source
-
-		$noexts = array("mp3", "mp4", "ogg", "ogv", "oga", "ogm", "webm");
-		$ext = pathinfo(strtolower($embedurl), PATHINFO_EXTENSION);
-
-
-		if (is_null($txt)) {
-			$txt = "";
-
-			if (!in_array($ext, $noexts)) {
-				// try oembed autodiscovery
-				$redirects = 0;
-				$html_text = fetch_url($embedurl, false, $redirects, 15, "text/*");
-				if ($html_text) {
-					$dom = @DOMDocument::loadHTML($html_text);
-					if ($dom) {
-						$xpath = new DOMXPath($dom);
-						$entries = $xpath->query("//link[@type='application/json+oembed']");
-						foreach ($entries as $e) {
-							$href = $e->getAttributeNode("href")->nodeValue;
-							$txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
-							break;
-						}
-						$entries = $xpath->query("//link[@type='text/json+oembed']");
-						foreach ($entries as $e) {
-							$href = $e->getAttributeNode("href")->nodeValue;
-							$txt = fetch_url($href . '&maxwidth=' . $a->videowidth);
-							break;
-						}
-					}
-				}
-			}
-
-			$txt = trim($txt);
-
-			if (!$txt || $txt[0] != "{") {
-				$txt = '{"type":"error"}';
-			} else { //save in cache
-				$j = json_decode($txt);
-				if ($j->type != "error") {
-					dba::insert('oembed', array('url' => normalise_link($embedurl),
-						'content' => $txt, 'created' => datetime_convert()), true);
-				}
-
-				Cache::set($a->videowidth . $embedurl, $txt, CACHE_DAY);
-			}
-		}
-
-		$j = json_decode($txt);
-
-		if (!is_object($j)) {
-			return false;
-		}
-
-		// Always embed the SSL version
-		if (isset($j->html)) {
-			$j->html = str_replace(array("http://www.youtube.com/", "http://player.vimeo.com/"), array("https://www.youtube.com/", "https://player.vimeo.com/"), $j->html);
-		}
-
-		$j->embedurl = $embedurl;
-
-		// If fetching information doesn't work, then improve via internal functions
-		if (($j->type == "error") || ($no_rich_type && ($j->type == "rich"))) {
-			$data = ParseUrl::getSiteinfoCached($embedurl, true, false);
-			$j->type = $data["type"];
-
-			if ($j->type == "photo") {
-				$j->url = $data["url"];
-				//$j->width = $data["images"][0]["width"];
-				//$j->height = $data["images"][0]["height"];
-			}
-
-			if (isset($data["title"])) {
-				$j->title = $data["title"];
-			}
-
-			if (isset($data["text"])) {
-				$j->description = $data["text"];
-			}
-
-			if (is_array($data["images"])) {
-				$j->thumbnail_url = $data["images"][0]["src"];
-				$j->thumbnail_width = $data["images"][0]["width"];
-				$j->thumbnail_height = $data["images"][0]["height"];
-			}
-		}
-
-		call_hooks('oembed_fetch_url', $embedurl, $j);
-
-		return $j;
-	}
-
-	public static function formatObject($j)
-	{
-		$embedurl = $j->embedurl;
-		$jhtml = $j->html;
-		$ret = '<div class="oembed ' . $j->type . '">';
-		switch ($j->type) {
-			case "video":
-				if (isset($j->thumbnail_url)) {
-					$tw = (isset($j->thumbnail_width) && intval($j->thumbnail_width)) ? $j->thumbnail_width : 200;
-					$th = (isset($j->thumbnail_height) && intval($j->thumbnail_height)) ? $j->thumbnail_height : 180;
-					// make sure we don't attempt divide by zero, fallback is a 1:1 ratio
-					$tr = (($th) ? $tw / $th : 1);
-
-					$th = 120;
-					$tw = $th * $tr;
-					$tpl = get_markup_template('oembed_video.tpl');
-					$ret .= replace_macros($tpl, array(
-						'$baseurl' => System::baseUrl(),
-						'$embedurl' => $embedurl,
-						'$escapedhtml' => base64_encode($jhtml),
-						'$tw' => $tw,
-						'$th' => $th,
-						'$turl' => $j->thumbnail_url,
-					));
-				} else {
-					$ret = $jhtml;
-				}
-				break;
-			case "photo":
-				$ret .= '<img width="' . $j->width . '" src="' . proxy_url($j->url) . '">';
-				break;
-			case "link":
-				break;
-			case "rich":
-				if (self::isAllowedURL($embedurl)) {
-					$ret .= proxy_parse_html($jhtml);
-				}
-				break;
-		}
-
-		$ret .= '</div>';
-		// add link to source if not present in "rich" type
-		if ($j->type != 'rich' || !strpos($j->html, $embedurl)) {
-			$ret .= '<h4>';
-			if (isset($j->title)) {
-				if (isset($j->provider_name)) {
-					$ret .= $j->provider_name . ": ";
-				}
-
-				$embedlink = (isset($j->title)) ? $j->title : $embedurl;
-				$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $embedlink . '</a>';
-				if (isset($j->author_name)) {
-					$ret .= ' (' . $j->author_name . ')';
-				}
-			} elseif (isset($j->provider_name) || isset($j->author_name)) {
-				$embedlink = "";
-				if (isset($j->provider_name)) {
-					$embedlink .= $j->provider_name;
-				}
-
-				if (isset($j->author_name)) {
-					if ($embedlink != "") {
-						$embedlink .= ": ";
-					}
-
-					$embedlink .= $j->author_name;
-				}
-				if (trim($embedlink) == "") {
-					$embedlink = $embedurl;
-				}
-
-				$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $embedlink . '</a>';
-			}
-			$ret .= "</h4>";
-		} elseif (!strpos($j->html, $embedurl)) {
-			// add <a> for html2bbcode conversion
-			$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $j->title . '</a>';
-		}
-
-		$ret = str_replace("\n", "", $ret);
-		return mb_convert_encoding($ret, 'HTML-ENTITIES', mb_detect_encoding($ret));
-	}
-
-	public static function BBCode2HTML($text)
-	{
-		$stopoembed = Config::get("system", "no_oembed");
-		if ($stopoembed == true) {
-			return preg_replace("/\[embed\](.+?)\[\/embed\]/is", "<!-- oembed $1 --><i>" . t('Embedding disabled') . " : $1</i><!-- /oembed $1 -->", $text);
-		}
-		return preg_replace_callback("/\[embed\](.+?)\[\/embed\]/is", ['self', 'replaceCallback'], $text);
-	}
-
-	/**
-	 * Find <span class='oembed'>..<a href='url' rel='oembed'>..</a></span>
-	 * and replace it with [embed]url[/embed]
-	 */
-	public static function HTML2BBCode($text)
-	{
-		// start parser only if 'oembed' is in text
-		if (strpos($text, "oembed")) {
-
-			// convert non ascii chars to html entities
-			$html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
-
-			// If it doesn't parse at all, just return the text.
-			$dom = @DOMDocument::loadHTML($html_text);
-			if (!$dom) {
-				return $text;
-			}
-			$xpath = new DOMXPath($dom);
-
-			$xattr = self::buildXPath("class", "oembed");
-			$entries = $xpath->query("//div[$xattr]");
-
-			$xattr = "@rel='oembed'"; //oe_build_xpath("rel","oembed");
-			foreach ($entries as $e) {
-				$href = $xpath->evaluate("a[$xattr]/@href", $e)->item(0)->nodeValue;
-				if (!is_null($href)) {
-					$e->parentNode->replaceChild(new DOMText("[embed]" . $href . "[/embed]"), $e);
-				}
-			}
-			return self::getInnerHTML($dom->getElementsByTagName("body")->item(0));
-		} else {
-			return $text;
-		}
-	}
-
-	/**
-	 * Determines if rich content OEmbed is allowed for the provided URL
-	 *
-	 * @brief Determines if rich content OEmbed is allowed for the provided URL
-	 * @param string $url
-	 * @return boolean
-	 */
-	public static function isAllowedURL($url)
-	{
-		if (!Config::get('system', 'no_oembed_rich_content')) {
-			return true;
-		}
-
-		$domain = parse_url($url, PHP_URL_HOST);
-
-		$str_allowed = Config::get('system', 'allowed_oembed', '');
-		$allowed = explode(',', $str_allowed);
-
-		return allowed_domain($domain, $allowed, true);
-	}
-
-	public static function getHTML($url, $title = null)
-	{
-		// Always embed the SSL version
-		$url = str_replace(array("http://www.youtube.com/", "http://player.vimeo.com/"),
-					array("https://www.youtube.com/", "https://player.vimeo.com/"), $url);
-
-		$o = OEmbed::fetchURL($url);
-
-		if (!is_object($o) || $o->type == 'error') {
-			throw new Exception('OEmbed failed for URL: ' . $url);
-		}
-
-		if (x($title)) {
-			$o->title = $title;
-		}
-
-		$html = OEmbed::formatObject($o);
-
-		return $html;
-	}
-
-	/**
-	 * @brief Generates the iframe HTML for an oembed attachment.
-	 *
-	 * Width and height are given by the remote, and are regularly too small for
-	 * the generated iframe.
-	 *
-	 * The width is entirely discarded for the actual width of the post, while fixed
-	 * height is used as a starting point before the inevitable resizing.
-	 *
-	 * Since the iframe is automatically resized on load, there are no need for ugly
-	 * and impractical scrollbars.
-	 *
-	 * @todo This function is currently unused until someone™ adds support for a separate OEmbed domain
-	 *
-	 * @param string $src Original remote URL to embed
-	 * @param string $width
-	 * @param string $height
-	 * @return string formatted HTML
-	 *
-	 * @see oembed_format_object()
-	 */
-	private static function iframe($src, $width, $height)
-	{
-		$a = get_app();
-
-		if (!$height || strstr($height, '%')) {
-			$height = '200';
-		}
-		$width = '100%';
-
-		$src = System::baseUrl() . '/oembed/' . base64url_encode($src);
-		return '<iframe onload="resizeIframe(this);" class="embed_rich" height="' . $height . '" width="' . $width . '" src="' . $src . '" allowfullscreen scrolling="no" frameborder="no">' . t('Embedded content') . '</iframe>';
-	}
-
-	/**
-	 * Generates an XPath query to select elements whose provided attribute contains
-	 * the provided value in a space-separated list.
-	 *
-	 * @brief Generates attribute search XPath string
-	 *
-	 * @param string $attr Name of the attribute to seach
-	 * @param string $value Value to search in a space-separated list
-	 * @return string
-	 */
-	private static function buildXPath($attr, $value)
-	{
-		// https://www.westhoffswelt.de/blog/2009/6/9/select-html-elements-with-more-than-one-css-class-using-xpath
-		return "contains(normalize-space(@$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'";
-	}
-
-	/**
-	 * Returns the inner XML string of a provided DOMNode
-	 *
-	 * @brief Returns the inner XML string of a provided DOMNode
-	 *
-	 * @param DOMNode $node
-	 * @return string
-	 */
-	private static function getInnerHTML(DOMNode $node)
-	{
-		$innerHTML = '';
-		$children = $node->childNodes;
-		foreach ($children as $child) {
-			$innerHTML .= $child->ownerDocument->saveXML($child);
-		}
-		return $innerHTML;
-	}
-
-}
+<?php
+
+/**
+ * @file src/Content/OEmbed.php
+ */
+namespace Friendica\Content;
+
+use Friendica\Core\Addon;
+use Friendica\Core\Cache;
+use Friendica\Core\Config;
+use Friendica\Core\L10n;
+use Friendica\Core\System;
+use Friendica\Database\DBM;
+use Friendica\Util\DateTimeFormat;
+use Friendica\Util\Network;
+use Friendica\Util\ParseUrl;
+use dba;
+use DOMDocument;
+use DOMNode;
+use DOMText;
+use DOMXPath;
+use Exception;
+
+require_once 'include/dba.php';
+require_once 'mod/proxy.php';
+
+/**
+ * Handles all OEmbed content fetching and replacement
+ *
+ * OEmbed is a standard used to allow an embedded representation of a URL on
+ * third party sites
+ *
+ * @see https://oembed.com
+ *
+ * @author Hypolite Petovan <mrpetovan@gmail.com>
+ */
+class OEmbed
+{
+	public static function replaceCallback($matches)
+	{
+		$embedurl = $matches[1];
+		$j = self::fetchURL($embedurl, !self::isAllowedURL($embedurl));
+		$s = self::formatObject($j);
+
+		return $s;
+	}
+
+	/**
+	 * @brief Get data from an URL to embed its content.
+	 *
+	 * @param string $embedurl The URL from which the data should be fetched.
+	 * @param bool $no_rich_type If set to true rich type content won't be fetched.
+	 *
+	 * @return bool|object Returns object with embed content or false if no embeddable
+	 * 	                   content exists
+	 */
+	public static function fetchURL($embedurl, $no_rich_type = false)
+	{
+		$embedurl = trim($embedurl, "'");
+		$embedurl = trim($embedurl, '"');
+
+		$a = get_app();
+
+		$condition = ['url' => normalise_link($embedurl), 'maxwidth' => $a->videowidth];
+		$oembed = dba::selectFirst('oembed', ['content'], $condition);
+		if (DBM::is_result($oembed)) {
+			$txt = $oembed["content"];
+		} else {
+			$txt = Cache::get($a->videowidth . $embedurl);
+		}
+		// These media files should now be caught in bbcode.php
+		// left here as a fallback in case this is called from another source
+
+		$noexts = ["mp3", "mp4", "ogg", "ogv", "oga", "ogm", "webm"];
+		$ext = pathinfo(strtolower($embedurl), PATHINFO_EXTENSION);
+
+
+		if (is_null($txt)) {
+			$txt = "";
+
+			if (!in_array($ext, $noexts)) {
+				// try oembed autodiscovery
+				$redirects = 0;
+				$html_text = Network::fetchUrl($embedurl, false, $redirects, 15, "text/*");
+				if ($html_text) {
+					$dom = @DOMDocument::loadHTML($html_text);
+					if ($dom) {
+						$xpath = new DOMXPath($dom);
+						$entries = $xpath->query("//link[@type='application/json+oembed']");
+						foreach ($entries as $e) {
+							$href = $e->getAttributeNode("href")->nodeValue;
+							$txt = Network::fetchUrl($href . '&maxwidth=' . $a->videowidth);
+							break;
+						}
+						$entries = $xpath->query("//link[@type='text/json+oembed']");
+						foreach ($entries as $e) {
+							$href = $e->getAttributeNode("href")->nodeValue;
+							$txt = Network::fetchUrl($href . '&maxwidth=' . $a->videowidth);
+							break;
+						}
+					}
+				}
+			}
+
+			$txt = trim($txt);
+
+			if (!$txt || $txt[0] != "{") {
+				$txt = '{"type":"error"}';
+			} else { //save in cache
+				$j = json_decode($txt);
+				if ($j->type != "error") {
+					dba::insert('oembed', [
+						'url' => normalise_link($embedurl),
+						'maxwidth' => $a->videowidth,
+						'content' => $txt,
+						'created' => DateTimeFormat::utcNow()
+					], true);
+				}
+
+				Cache::set($a->videowidth . $embedurl, $txt, CACHE_DAY);
+			}
+		}
+
+		$j = json_decode($txt);
+
+		if (!is_object($j)) {
+			return false;
+		}
+
+		// Always embed the SSL version
+		if (isset($j->html)) {
+			$j->html = str_replace(["http://www.youtube.com/", "http://player.vimeo.com/"], ["https://www.youtube.com/", "https://player.vimeo.com/"], $j->html);
+		}
+
+		$j->embedurl = $embedurl;
+
+		// If fetching information doesn't work, then improve via internal functions
+		if ($no_rich_type && ($j->type == "rich")) {
+			$data = ParseUrl::getSiteinfoCached($embedurl, true, false);
+			$j->type = $data["type"];
+
+			if ($j->type == "photo") {
+				$j->url = $data["url"];
+			}
+
+			if (isset($data["title"])) {
+				$j->title = $data["title"];
+			}
+
+			if (isset($data["text"])) {
+				$j->description = $data["text"];
+			}
+
+			if (is_array($data["images"])) {
+				$j->thumbnail_url = $data["images"][0]["src"];
+				$j->thumbnail_width = $data["images"][0]["width"];
+				$j->thumbnail_height = $data["images"][0]["height"];
+			}
+		}
+
+		Addon::callHooks('oembed_fetch_url', $embedurl, $j);
+
+		return $j;
+	}
+
+	private static function formatObject($j)
+	{
+		$embedurl = $j->embedurl;
+		$jhtml = $j->html;
+		$ret = '<div class="oembed ' . $j->type . '">';
+		switch ($j->type) {
+			case "video":
+				if (isset($j->thumbnail_url)) {
+					$tw = (isset($j->thumbnail_width) && intval($j->thumbnail_width)) ? $j->thumbnail_width : 200;
+					$th = (isset($j->thumbnail_height) && intval($j->thumbnail_height)) ? $j->thumbnail_height : 180;
+					// make sure we don't attempt divide by zero, fallback is a 1:1 ratio
+					$tr = (($th) ? $tw / $th : 1);
+
+					$th = 120;
+					$tw = $th * $tr;
+					$tpl = get_markup_template('oembed_video.tpl');
+					$ret .= replace_macros($tpl, [
+						'$baseurl' => System::baseUrl(),
+						'$embedurl' => $embedurl,
+						'$escapedhtml' => base64_encode($jhtml),
+						'$tw' => $tw,
+						'$th' => $th,
+						'$turl' => $j->thumbnail_url,
+					]);
+				} else {
+					$ret = $jhtml;
+				}
+				break;
+			case "photo":
+				$ret .= '<img width="' . $j->width . '" src="' . proxy_url($j->url) . '">';
+				break;
+			case "link":
+				break;
+			case "rich":
+				$ret .= proxy_parse_html($jhtml);
+				break;
+		}
+
+		// add link to source if not present in "rich" type
+		if ($j->type != 'rich' || !strpos($j->html, $embedurl)) {
+			$ret .= '<h4>';
+			if (!empty($j->title)) {
+				if (!empty($j->provider_name)) {
+					$ret .= $j->provider_name . ": ";
+				}
+
+				$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $j->title . '</a>';
+				if (!empty($j->author_name)) {
+					$ret .= ' (' . $j->author_name . ')';
+				}
+			} elseif (!empty($j->provider_name) || !empty($j->author_name)) {
+				$embedlink = "";
+				if (!empty($j->provider_name)) {
+					$embedlink .= $j->provider_name;
+				}
+
+				if (!empty($j->author_name)) {
+					if ($embedlink != "") {
+						$embedlink .= ": ";
+					}
+
+					$embedlink .= $j->author_name;
+				}
+				if (trim($embedlink) == "") {
+					$embedlink = $embedurl;
+				}
+
+				$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $embedlink . '</a>';
+			} else {
+				$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $embedurl . '</a>';
+			}
+			$ret .= "</h4>";
+		} elseif (!strpos($j->html, $embedurl)) {
+			// add <a> for html2bbcode conversion
+			$ret .= '<a href="' . $embedurl . '" rel="oembed">' . $j->title . '</a>';
+		}
+
+		$ret .= '</div>';
+
+		$ret = str_replace("\n", "", $ret);
+		return mb_convert_encoding($ret, 'HTML-ENTITIES', mb_detect_encoding($ret));
+	}
+
+	public static function BBCode2HTML($text)
+	{
+		$stopoembed = Config::get("system", "no_oembed");
+		if ($stopoembed == true) {
+			return preg_replace("/\[embed\](.+?)\[\/embed\]/is", "<!-- oembed $1 --><i>" . L10n::t('Embedding disabled') . " : $1</i><!-- /oembed $1 -->", $text);
+		}
+		return preg_replace_callback("/\[embed\](.+?)\[\/embed\]/is", ['self', 'replaceCallback'], $text);
+	}
+
+	/**
+	 * Find <span class='oembed'>..<a href='url' rel='oembed'>..</a></span>
+	 * and replace it with [embed]url[/embed]
+	 */
+	public static function HTML2BBCode($text)
+	{
+		// start parser only if 'oembed' is in text
+		if (strpos($text, "oembed")) {
+
+			// convert non ascii chars to html entities
+			$html_text = mb_convert_encoding($text, 'HTML-ENTITIES', mb_detect_encoding($text));
+
+			// If it doesn't parse at all, just return the text.
+			$dom = @DOMDocument::loadHTML($html_text);
+			if (!$dom) {
+				return $text;
+			}
+			$xpath = new DOMXPath($dom);
+
+			$xattr = self::buildXPath("class", "oembed");
+			$entries = $xpath->query("//div[$xattr]");
+
+			$xattr = "@rel='oembed'"; //oe_build_xpath("rel","oembed");
+			foreach ($entries as $e) {
+				$href = $xpath->evaluate("a[$xattr]/@href", $e)->item(0)->nodeValue;
+				if (!is_null($href)) {
+					$e->parentNode->replaceChild(new DOMText("[embed]" . $href . "[/embed]"), $e);
+				}
+			}
+			return self::getInnerHTML($dom->getElementsByTagName("body")->item(0));
+		} else {
+			return $text;
+		}
+	}
+
+	/**
+	 * Determines if rich content OEmbed is allowed for the provided URL
+	 *
+	 * @brief Determines if rich content OEmbed is allowed for the provided URL
+	 * @param string $url
+	 * @return boolean
+	 */
+	public static function isAllowedURL($url)
+	{
+		if (!Config::get('system', 'no_oembed_rich_content')) {
+			return true;
+		}
+
+		$domain = parse_url($url, PHP_URL_HOST);
+		if (!x($domain)) {
+			return false;
+		}
+
+		$str_allowed = Config::get('system', 'allowed_oembed', '');
+		if (!x($str_allowed)) {
+			return false;
+		}
+
+		$allowed = explode(',', $str_allowed);
+
+		return Network::isDomainAllowed($domain, $allowed);
+	}
+
+	public static function getHTML($url, $title = null)
+	{
+		// Always embed the SSL version
+		$url = str_replace(["http://www.youtube.com/", "http://player.vimeo.com/"],
+					["https://www.youtube.com/", "https://player.vimeo.com/"], $url);
+
+		$o = self::fetchURL($url, !self::isAllowedURL($url));
+
+		if (!is_object($o) || $o->type == 'error') {
+			throw new Exception('OEmbed failed for URL: ' . $url);
+		}
+
+		if (x($title)) {
+			$o->title = $title;
+		}
+
+		$html = self::formatObject($o);
+
+		return $html;
+	}
+
+	/**
+	 * @brief Generates the iframe HTML for an oembed attachment.
+	 *
+	 * Width and height are given by the remote, and are regularly too small for
+	 * the generated iframe.
+	 *
+	 * The width is entirely discarded for the actual width of the post, while fixed
+	 * height is used as a starting point before the inevitable resizing.
+	 *
+	 * Since the iframe is automatically resized on load, there are no need for ugly
+	 * and impractical scrollbars.
+	 *
+	 * @todo This function is currently unused until someone™ adds support for a separate OEmbed domain
+	 *
+	 * @param string $src Original remote URL to embed
+	 * @param string $width
+	 * @param string $height
+	 * @return string formatted HTML
+	 *
+	 * @see oembed_format_object()
+	 */
+	private static function iframe($src, $width, $height)
+	{
+		$a = get_app();
+
+		if (!$height || strstr($height, '%')) {
+			$height = '200';
+		}
+		$width = '100%';
+
+		$src = System::baseUrl() . '/oembed/' . base64url_encode($src);
+		return '<iframe onload="resizeIframe(this);" class="embed_rich" height="' . $height . '" width="' . $width . '" src="' . $src . '" allowfullscreen scrolling="no" frameborder="no">' . L10n::t('Embedded content') . '</iframe>';
+	}
+
+	/**
+	 * Generates an XPath query to select elements whose provided attribute contains
+	 * the provided value in a space-separated list.
+	 *
+	 * @brief Generates attribute search XPath string
+	 *
+	 * @param string $attr Name of the attribute to seach
+	 * @param string $value Value to search in a space-separated list
+	 * @return string
+	 */
+	private static function buildXPath($attr, $value)
+	{
+		// https://www.westhoffswelt.de/blog/2009/6/9/select-html-elements-with-more-than-one-css-class-using-xpath
+		return "contains(normalize-space(@$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'";
+	}
+
+	/**
+	 * Returns the inner XML string of a provided DOMNode
+	 *
+	 * @brief Returns the inner XML string of a provided DOMNode
+	 *
+	 * @param DOMNode $node
+	 * @return string
+	 */
+	private static function getInnerHTML(DOMNode $node)
+	{
+		$innerHTML = '';
+		$children = $node->childNodes;
+		foreach ($children as $child) {
+			$innerHTML .= $child->ownerDocument->saveXML($child);
+		}
+		return $innerHTML;
+	}
+
+}