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AutoEmbed.php
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AutoEmbed.php
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<?php
/**
* Class to parse URLs & embed remote content vie oEmbed
* Borrowed heavily from WordPress. Thanks!
*
* @link http://oembed.com
* @link https://gist.github.com/joshhartman/5380593
* @link http://www.warpconduit.net/2013/04/13/automatically-embedding-video-using-only-the-url-with-the-help-of-oembed
* @link https://github.com/MarQuisKnox/AutoEmbed
*
* @example
*
* $AutoEmbed = new AutoEmbed();
* $content = $Autoembed->parse($content);
* echo $content;
*
* @package AutoEmbed
*/
class AutoEmbed
{
public $embedHeight = 480;
public $embedWidth = 853;
public $providers = array(
'#http://(www\.)?youtube\.com/watch.*#i' => array( 'http://www.youtube.com/oembed', true ),
'#https://(www\.)?youtube\.com/watch.*#i' => array( 'http://www.youtube.com/oembed?scheme=https', true ),
'#http://(www\.)?youtube\.com/playlist.*#i' => array( 'http://www.youtube.com/oembed', true ),
'#https://(www\.)?youtube\.com/playlist.*#i' => array( 'http://www.youtube.com/oembed?scheme=https', true ),
'#http://youtu\.be/.*#i' => array( 'http://www.youtube.com/oembed', true ),
'#https://youtu\.be/.*#i' => array( 'http://www.youtube.com/oembed?scheme=https', true ),
'http://blip.tv/*' => array( 'http://blip.tv/oembed/', false ),
'#https?://(.+\.)?vimeo\.com/.*#i' => array( 'http://vimeo.com/api/oembed.{format}', true ),
'#https?://(www\.)?dailymotion\.com/.*#i' => array( 'http://www.dailymotion.com/services/oembed', true ),
'http://dai.ly/*' => array( 'http://www.dailymotion.com/services/oembed', false ),
'#https?://(www\.)?flickr\.com/.*#i' => array( 'https://www.flickr.com/services/oembed/', true ),
'#https?://flic\.kr/.*#i' => array( 'https://www.flickr.com/services/oembed/', true ),
'#https?://(.+\.)?smugmug\.com/.*#i' => array( 'http://api.smugmug.com/services/oembed/', true ),
'#https?://(www\.)?hulu\.com/watch/.*#i' => array( 'http://www.hulu.com/api/oembed.{format}', true ),
'http://revision3.com/*' => array( 'http://revision3.com/api/oembed/', false ),
'http://i*.photobucket.com/albums/*' => array( 'http://photobucket.com/oembed', false ),
'http://gi*.photobucket.com/groups/*' => array( 'http://photobucket.com/oembed', false ),
'#https?://(www\.)?scribd\.com/doc/.*#i' => array( 'http://www.scribd.com/services/oembed', true ),
'http://wordpress.tv/*' => array( 'http://wordpress.tv/oembed/', false ),
'#https?://(.+\.)?polldaddy\.com/.*#i' => array( 'http://polldaddy.com/oembed/', true ),
'#https?://poll\.fm/.*#i' => array( 'http://polldaddy.com/oembed/', true ),
'#https?://(www\.)?funnyordie\.com/videos/.*#i' => array( 'http://www.funnyordie.com/oembed', true ),
'#https?://(www\.)?twitter\.com/.+?/status(es)?/.*#i' => array( 'https://api.twitter.com/1/statuses/oembed.{format}', true ),
'#https?://(www\.)?soundcloud\.com/.*#i' => array( 'http://soundcloud.com/oembed', true ),
'#https?://(www\.)?slideshare\.net/.*#i' => array( 'https://www.slideshare.net/api/oembed/2', true ),
'#https?://(www\.)?instagr(\.am|am\.com)/p/.*#i' => array( 'http://api.instagram.com/oembed?url=', true ),
'#https?://(www\.)?rdio\.com/.*#i' => array( 'http://www.rdio.com/api/oembed/', true ),
'#https?://rd\.io/x/.*#i' => array( 'http://www.rdio.com/api/oembed/', true ),
'#https?://(open|play)\.spotify\.com/.*#i' => array( 'https://embed.spotify.com/oembed/', true ),
'#https?://(.+\.)?imgur\.com/.*#i' => array( 'http://api.imgur.com/oembed', true ),
'#https?://(www\.)?meetu(\.ps|p\.com)/.*#i' => array( 'http://api.meetup.com/oembed', true ),
'#https?://(www\.)?issuu\.com/.+/docs/.+#i' => array( 'http://issuu.com/oembed_wp', true ),
'#https?://(www\.)?collegehumor\.com/video/.*#i' => array( 'http://www.collegehumor.com/oembed.{format}', true ),
'#https?://(www\.)?mixcloud\.com/.*#i' => array( 'http://www.mixcloud.com/oembed', true ),
'#https?://(www\.|embed\.)?ted\.com/talks/.*#i' => array( 'http://www.ted.com/talks/oembed.{format}', true ),
'#https?://(www\.)?(animoto|video214)\.com/play/.*#i' => array( 'http://animoto.com/oembeds/create', true ),
'#https?://www\.facebook\.com/.*/posts/.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/.*/activity/.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/.*/photos/.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/photo(s/|\.php).*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/permalink\.php.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/media/.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/questions/.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/notes/.*#i' => array( 'https://www.facebook.com/plugins/post/oembed.json/', true ),
'#https?://www\.facebook\.com/.*/videos/.*#i' => array( 'https://www.facebook.com/plugins/video/oembed.json/', true ),
'#https?://www\.facebook\.com/video\.php.*#i' => array( 'https://www.facebook.com/plugins/video/oembed.json/', true ),
'#https?://(www\.)?screencast\.com/.*#i' => array( 'https://api.screencast.com/external/oembed', true ),
);
public function getEmbedHeight()
{
return $this->embedHeight;
}
public function setEmbedHeight( $height )
{
$this->embedHeight = $height;
}
public function getEmbedWidth()
{
return $this->embedWidth;
}
public function setEmbedWidth( $width )
{
$this->embedWidth = $width;
}
/**
* Passes on any unlinked URLs that are on their own line for potential embedding.
* @param string $content The content to be searched.
* @return string Potentially modified $content.
*/
public function parse( $content )
{
return preg_replace_callback( '|^\s*(https?://[^\s"]+)\s*$|im', array( $this, 'autoembed_callback' ), $content );
}
/**
* Callback function for @link AutoEmbed::parse()
*
* @param array $match a regex match array
* @param boolean $autoDiscover
* @return string The embed HTML on success, otherwise the original URL.
*/
public function autoembed_callback( $match, $autoDiscover = false )
{
$params = array();
$params['discover'] = $autoDiscover;
$return = $this->get_html( $match[1], $params );
return "\n".$return."\n";
}
/**
* The do-it-all function that takes a URL and attempts to return the HTML.
*
* @param string $url The URL to the content that should be attempted to be embedded.
* @param array $args Optional arguments.
* @return string the source URL on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
*/
public function get_html( $url, $args = array() )
{
$provider = false;
if ( !isset( $args['discover'] ) ) {
$args['discover'] = false;
}
$i = 0;
foreach ( $this->providers AS $matchmask => $data ) {
$i++;
list( $providerurl, $regex ) = $data;
// Turn the asterisk-type provider URLs into regex
if ( !$regex ) {
$matchmask = '#' . str_replace( '___wildcard___', '(.+)', preg_quote( str_replace( '*', '___wildcard___', $matchmask ), '#' ) ) . '#i';
$matchmask = preg_replace( '|^#http\\\://|', '#https?\://', $matchmask );
}
if ( preg_match( $matchmask, $url ) ) {
$provider = str_replace( '{format}', 'json', $providerurl ); // JSON is easier to deal with than XML
break;
}
}
if ( !$provider && $args['discover'] ) {
$provider = $this->discover( $url );
}
if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) ) {
return $url;
}
return $this->data2html( $data, $url );
}
/**
* Attempts to find oEmbed provider discovery <link> tags at the given URL.
*
* @param string $url The URL that should be inspected for discovery <link> tags.
* @return bool|string False on failure, otherwise the oEmbed provider URL.
*/
public function discover( $url )
{
$providers = array();
// Fetch URL content
if ( $html = $this->my_remote_get( $url ) ) {
// <link> types that contain oEmbed provider URLs
$linktypes = array(
'application/json+oembed' => 'json',
'text/xml+oembed' => 'xml',
'application/xml+oembed' => 'xml', // Incorrect, but used by at least Vimeo
);
// Strip <body>
$html = substr( $html, 0, stripos( $html, '</head>' ) );
// Do a quick check
$tagfound = false;
foreach ( $linktypes as $linktype => $format ) {
if ( stripos($html, $linktype) ) {
$tagfound = true;
break;
}
}
if ( $tagfound && preg_match_all( '/<link([^<>]+)>/i', $html, $links ) ) {
foreach ( $links[1] as $link ) {
$atts = $this->shortcode_parse_atts( $link );
if ( !empty($atts['type']) && !empty($linktypes[$atts['type']]) && !empty($atts['href']) ) {
$providers[$linktypes[$atts['type']]] = $atts['href'];
// Stop here if it's JSON (that's all we need)
if ( 'json' == $linktypes[$atts['type']] )
break;
}
}
}
}
// JSON is preferred to XML
if ( !empty($providers['json']) )
return $providers['json'];
elseif ( !empty($providers['xml']) )
return $providers['xml'];
else
return false;
}
/**
* Connects to a oEmbed provider and returns the result.
*
* @param string $provider The URL to the oEmbed provider.
* @param string $url The URL to the content that is desired to be embedded.
* @param array $args Optional arguments.
* @return bool|object False on failure, otherwise the result in the form of an object.
*/
public function fetch( $provider, $url, $args = array() )
{
$width = $this->embedWidth;
$height = $this->embedHeight;
$args = array_merge( compact('width', 'height'), $args );
$provider = $this->add_query_arg( 'maxwidth', (int) $args['width'], $provider );
$provider = $this->add_query_arg( 'maxheight', (int) $args['height'], $provider );
$provider = $this->add_query_arg( 'url', $url, $provider );
foreach( array( 'json', 'xml' ) AS $format ) {
$result = $this->_fetch_with_format( $provider, $format );
return $result;
}
return false;
}
/**
* Fetches result from an oEmbed provider for a specific format and complete provider URL
* @access private
* @param string $provider_url_with_args URL to the provider with full arguments list (url, maxheight, etc.)
* @param string $format Format to use
* @return bool|object False on failure, otherwise the result in the form of an object.
*/
private function _fetch_with_format( $provider_url_with_args, $format )
{
$provider_url_with_args = $this->add_query_arg( 'format', $format, $provider_url_with_args );
if ( !$body = $this->my_remote_get( $provider_url_with_args ) ) {
return false;
}
$parse_method = "_parse_$format";
return $this->$parse_method( $body );
}
/**
* Parses a json response body.
* @access private
*/
private function _parse_json( $response_body )
{
return ( ( $data = json_decode( trim( $response_body ) ) ) && is_object( $data ) ) ? $data : false;
}
/**
* Parses an XML response body.
* @access private
*/
private function _parse_xml( $response_body )
{
if ( !function_exists('simplexml_load_string') ) {
return false;
}
if ( ! class_exists( 'DOMDocument' ) )
return false;
$errors = libxml_use_internal_errors( true );
$old_value = null;
if ( function_exists( 'libxml_disable_entity_loader' ) ) {
$old_value = libxml_disable_entity_loader( true );
}
$dom = new DOMDocument;
$success = $dom->loadXML( $response_body );
if ( ! is_null( $old_value ) ) {
libxml_disable_entity_loader( $old_value );
}
libxml_use_internal_errors( $errors );
if ( ! $success || isset( $dom->doctype ) ) {
return false;
}
$data = simplexml_import_dom( $dom );
if ( ! is_object( $data ) )
return false;
$return = new stdClass;
foreach ( $data as $key => $value )
$return->$key = (string) $value;
return $return;
}
/**
* Converts a data object and returns the HTML.
*
* @param object $data A data object result from an oEmbed provider.
* @param string $url The URL to the content that is desired to be embedded.
* @return bool|string False on error, otherwise the HTML needed to embed.
*/
public function data2html( $data, $url, $responsive = true )
{
if ( !is_object( $data ) || empty( $data->type ) ) {
return false;
}
$return = false;
switch ( $data->type ) {
case 'photo':
if ( empty( $data->url ) || empty( $data->width ) || empty( $data->height ) )
break;
if ( ! is_string( $data->url ) || ! is_numeric( $data->width ) || ! is_numeric( $data->height ) )
break;
$title = ! empty( $data->title ) && is_string( $data->title ) ? $data->title : '';
$return = '<a href="' . $this->esc_url( $url ) . '"><img src="' . htmlspecialchars( $data->url, ENT_QUOTES, 'UTF-8' ) . '" alt="' . htmlspecialchars($title, ENT_QUOTES, 'UTF-8') . '" width="' . htmlspecialchars($data->width, ENT_QUOTES, 'UTF-8') . '" height="' . htmlspecialchars($data->height, ENT_QUOTES, 'UTF-8') . '" /></a>';
break;
case 'video':
case 'rich':
if ( ! empty( $data->html ) && is_string( $data->html ) )
$return = $data->html;
break;
case 'link':
if ( ! empty( $data->title ) && is_string( $data->title ) )
$return = '<a href="' . $this->esc_url( $url ) . '">' . htmlspecialchars( $data->title, ENT_QUOTES, 'UTF-8') . '</a>';
break;
default:
$return = false;
}
// Strip any new lines from the HTML.
if ( false !== strpos( $return, "\n" ) )
$return = str_replace( array( "\r\n", "\n" ), '', $return );
if( $responsive ) {
$return = $this->makeEmbedResponsive( $return );
}
return $return;
}
/**
* Grabs the response from a remote URL.
*
* @param string $url The remote URL.
* @param boolean $followLocation CURL_FOLLOWLOCATION
* @return bool|string False on error, otherwise the response body.
*/
public function my_remote_get( $url, $followLocation = true )
{
$browser = 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.16 (KHTML, like Gecko) \Chrome/24.0.1304.0 Safari/537.16';
$handle = curl_init();
curl_setopt( $handle, CURLOPT_CONNECTTIMEOUT, 5 );
curl_setopt( $handle, CURLOPT_TIMEOUT, 5 );
curl_setopt( $handle, CURLOPT_URL, $url);
curl_setopt( $handle, CURLOPT_RETURNTRANSFER, true );
curl_setopt( $handle, CURLOPT_SSL_VERIFYHOST, false );
curl_setopt( $handle, CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $handle, CURLOPT_FOLLOWLOCATION, $followLocation );
curl_setopt( $handle, CURLOPT_HEADER, false );
curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );
curl_setopt( $handle, CURLOPT_USERAGENT, $browser);
$response = curl_exec( $handle );
curl_close( $handle );
return $response;
}
/**
* Add HTTP query arguments.
*/
public function add_query_arg()
{
$ret = '';
$args = func_get_args();
if ( is_array( $args[0] ) ) {
if ( count( $args ) < 2 || false === $args[1] )
$uri = $_SERVER['REQUEST_URI'];
else
$uri = $args[1];
} else {
if ( count( $args ) < 3 || false === $args[2] )
$uri = $_SERVER['REQUEST_URI'];
else
$uri = $args[2];
}
if ( $frag = strstr( $uri, '#' ) )
$uri = substr( $uri, 0, -strlen( $frag ) );
else
$frag = '';
if ( 0 === stripos( 'http://', $uri ) ) {
$protocol = 'http://';
$uri = substr( $uri, 7 );
} elseif ( 0 === stripos( 'https://', $uri ) ) {
$protocol = 'https://';
$uri = substr( $uri, 8 );
} else {
$protocol = '';
}
if ( strpos( $uri, '?' ) !== false ) {
$parts = explode( '?', $uri, 2 );
if ( 1 == count( $parts ) ) {
$base = '?';
$query = $parts[0];
} else {
$base = $parts[0] . '?';
$query = $parts[1];
}
} elseif ( $protocol || strpos( $uri, '=' ) === false ) {
$base = $uri . '?';
$query = '';
} else {
$base = '';
$query = $uri;
}
parse_str( $query, $qs );
if ( is_array( $args[0] ) ) {
$kayvees = $args[0];
$qs = array_merge( $qs, $kayvees );
} else {
$qs[ $args[0] ] = $args[1];
}
foreach ( $qs as $k => $v ) {
if ( $v === false )
unset( $qs[$k] );
}
$ret = http_build_query( $qs, null, '&' );
$ret = trim( $ret, '?' );
$ret = preg_replace( '#=(&|$)#', '$1', $ret );
$ret = $protocol . $base . $ret . $frag;
$ret = rtrim( $ret, '?' );
return $ret;
}
/**
* Checks and cleans a URL.
*
* @param string $url The URL to be cleaned.
* @return string The cleaned $url.
*/
public function esc_url( $url )
{
if ( '' == $url )
return $url;
$url = preg_replace('|[^a-z0-9-~+_.?#=!&;,/:%@$\|*\'()\\x80-\\xff]|i', '', $url);
$strip = array('%0d', '%0a', '%0D', '%0A');
$url = $this->_deep_replace($strip, $url);
$url = str_replace(';//', '://', $url);
/* If the URL doesn't appear to contain a scheme, we
* presume it needs http:// appended (unless a relative
* link starting with /, # or ? or a php file).
*/
if ( strpos($url, ':') === false && ! in_array( $url[0], array( '/', '#', '?' ) ) &&
! preg_match('/^[a-z0-9-]+?\.php/i', $url) )
$url = 'http://' . $url;
$url = str_replace( '&', '&', $url );
$url = str_replace( "'", ''', $url );
return $url;
}
/**
* Perform a deep string replace operation to ensure the values in $search are no longer present
*
* Repeats the replacement operation until it no longer replaces anything so as to remove "nested" values
* e.g. $subject = '%0%0%0DDD', $search ='%0D', $result ='' rather than the '%0%0DD' that
* str_replace would return
*
* @access private
*
* @param string|array $search
* @param string $subject
* @return string The processed string
*/
private function _deep_replace( $search, $subject )
{
$found = true;
$subject = (string) $subject;
while ( $found ) {
$found = false;
foreach ( (array) $search as $val ) {
while ( strpos( $subject, $val ) !== false ) {
$found = true;
$subject = str_replace( $val, '', $subject );
}
}
}
return $subject;
}
/**
* Retrieve all attributes from the tag.
*
* @param string $text
* @return array List of attributes and their value.
*/
public function shortcode_parse_atts( $text )
{
$atts = array();
$pattern = '/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
$text = preg_replace("/[\x{00a0}\x{200b}]+/u", " ", $text);
if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
foreach ($match as $m) {
if (!empty($m[1]))
$atts[strtolower($m[1])] = stripcslashes($m[2]);
elseif (!empty($m[3]))
$atts[strtolower($m[3])] = stripcslashes($m[4]);
elseif (!empty($m[5]))
$atts[strtolower($m[5])] = stripcslashes($m[6]);
elseif (isset($m[7]) and strlen($m[7]))
$atts[] = stripcslashes($m[7]);
elseif (isset($m[8]))
$atts[] = stripcslashes($m[8]);
}
} else {
$atts = ltrim($text);
}
return $atts;
}
/**
* Make an embed responsive
*
* @param string $string
* @param string $targetWidth
* @return string
*/
public function makeEmbedResponsive( $string, $targetWidth = '100%' )
{
$string = preg_replace(
array( '/width="\d+"/i' ),
array( sprintf( 'width="%s"', $targetWidth ) ),
$string
);
return $string;
}
}