joshhartman · May 10, 2020 02:43 · May 2, 2015 · May 2, 2015 · Jun 21, 2014 · Apr 13, 2013
diff --git a/autoembed.php b/autoembed.php
@@ -53,7 +53,7 @@ function parse( $content ) {
      */
     function autoembed_callback( $match ) {
         $attr['discover'] = true;
-        $return = $this->get_html( $match[1], $attr );
+        $return = $this->get_html( $match[1], $attr ) or $return = '<p>'.$match[1].'</p>';
         return "\n$return\n";
     }
 
@@ -89,7 +89,7 @@ function get_html( $url, $args = '' ) {
                     $provider = $this->discover( $url );
 
             if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
-                    return '<p>'.$url.'</p>';
+                    return false;
 
             return $this->data2html( $data, $url );
     }

diff --git a/autoembed.php b/autoembed.php
@@ -89,7 +89,7 @@ function get_html( $url, $args = '' ) {
                     $provider = $this->discover( $url );
 
             if ( !$provider || false === $data = $this->fetch( $provider, $url, $args ) )
-                    return false;
+                    return '<p>'.$url.'</p>';
 
             return $this->data2html( $data, $url );
     }

diff --git a/autoembed-example.php b/autoembed-example.php
@@ -8,7 +8,7 @@
         <?php
         $content = "
         <p>Have a laugh...</p>
-        http://youtu.be/t50oEl3ZZLg
+        http://youtu.be/dMH0bHeiRNg
         <p>Hahahaha, awesome!</p>
         <p>Want to learn something interesting?</p>
         http://blip.tv/bushcraft/m-for-morocco-azbushcraft-com-1738329
@@ -17,7 +17,7 @@
         <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/
+        http://instagram.com/p/BUG/
         <p>Now that's easy.</p>
         ";
         echo '<h2>Before</h2>';

diff --git a/autoembed-example.php b/autoembed-example.php
@@ -0,0 +1,32 @@
+<!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>
diff --git a/autoembed.php b/autoembed.php
@@ -0,0 +1,463 @@
+<?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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