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vandarin/autoembed-example.php

Forked from joshhartman/autoembed-example.php
Created September 30, 2013 20:04
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autoembed-example.php
<!DOCTYPE html>
<html>
<head>
<title>AutoEmbed Examples</title>
</head>
<body>
<h1>AutoEmbed Examples</h1>
<?php
$content = "
<p>Have a laugh...</p>
http://youtu.be/t50oEl3ZZLg
<p>Hahahaha, awesome!</p>
<p>Want to learn something interesting?</p>
http://blip.tv/bushcraft/m-for-morocco-azbushcraft-com-1738329
<p>Something else perhaps?</p>
http://vimeo.com/62571137
<p>Maybe music is more your style?</p>
https://soundcloud.com/nanaperadze/f-chopin-dernier-nocturne
<p>A stylized photo could be just the ticket.</p>
http://instagram.com/p/YCKO_KI1z7/
<p>Now that's easy.</p>
";
echo '<h2>Before</h2>';
echo '<pre>'.htmlspecialchars($content, ENT_QUOTES, 'UTF-8').'</pre>';
echo '<h2>After</h2>';
require 'autoembed.php';
$autoembed = new AutoEmbed();
$content = $autoembed->parse($content);
echo $content;
?>
</body>
</html>
Raw
autoembed.php
<?php
/**
* Class to parse a string for URLs on their own line and use oEmbed to embed remote content based on the URL.
* Ripped from WordPress 3.5 for use in other PHP projects.
*
* Usage:
* $autoembed = new AutoEmbed();
* $content = $autoembed->parse($content);
* echo $content;
*
* @link http://oembed.com/ oEmbed Homepage
*
* @package AutoEmbed
*/
class AutoEmbed {
// List out some popular sites that support oEmbed.
var $providers = array(
'#https?://(www\.)?youtube.com/watch.*#i' => array( 'http://www.youtube.com/oembed', true ),
'http://youtu.be/*' => array( 'http://www.youtube.com/oembed', false ),
'http://blip.tv/*' => array( 'http://blip.tv/oembed/', false ),
'#https?://(www\.)?vimeo\.com/.*#i' => array( 'http://vimeo.com/api/oembed.{format}', true ),
'#https?://(www\.)?dailymotion\.com/.*#i' => array( 'http://www.dailymotion.com/services/oembed', true ),
'#https?://(www\.)?flickr\.com/.*#i' => array( 'http://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 ),
'#https?://(www\.)?viddler\.com/.*#i' => array( 'http://lab.viddler.com/services/oembed/', true ),
'http://qik.com/*' => array( 'http://qik.com/api/oembed.{format}', false ),
'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/.*#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?://(www\.)?funnyordie\.com/videos/.*#i' => array( 'http://www.funnyordie.com/oembed', true ),
'#https?://(www\.)?twitter.com/.+?/status(es)?/.*#i' => array( 'http://api.twitter.com/1/statuses/oembed.{format}', true ),
'#https?://(www\.)?soundcloud\.com/.*#i' => array( 'http://soundcloud.com/oembed', true ),
'#https?://(www\.)?slideshare.net/*#' => array( 'http://www.slideshare.net/api/oembed/2', true ),
'#http://instagr(\.am|am\.com)/p/.*#i' => array( 'http://api.instagram.com/oembed', true ),
);
/**
* 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.
*/
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.
* @return string The embed HTML on success, otherwise the original URL.
*/
function autoembed_callback( $match ) {
$attr['discover'] = true;
$return = $this->get_html( $match[1], $attr );
return "\n$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 bool|string False on failure, otherwise the UNSANITIZED (and potentially unsafe) HTML that should be used to embed.
*/
function get_html( $url, $args = '' ) {
$provider = false;
if ( !isset($args['discover']) )
$args['discover'] = true;
foreach ( $this->providers as $matchmask => $data ) {
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 false;
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.
*/
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->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.
*/
function fetch( $provider, $url, $args = '' ) {
$width = 500;
$height = min( ceil( $width * 1.5 ), 1000 );
$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.
*/
function data2html( $data, $url ) {
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 );
return $return;
}
/**
* Grabs the response from a remote URL.
*
* @param string $url The remote URL.
* @return bool|string False on error, otherwise the response body.
*/
function my_remote_get( $url ) {
$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, false );
curl_setopt( $handle, CURLOPT_HEADER, false );
curl_setopt( $handle, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_0 );
$response = curl_exec( $handle );
curl_close( $handle );
return $response;
}
/**
* Add HTTP query arguments.
*/
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.
*/
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( '&amp;', '&#038;', $url );
$url = str_replace( "'", '&#039;', $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 $text
* @return array List of attributes and their value.
*/
function shortcode_parse_atts($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;
}
}
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