fix #8 外部リンクのブログカードを作る

ブログカード作成のショートコードを追加。
SSL接続でエラーが出るサーバーあり。ogp画像は先方サーバ画像の読み込みなので、将来的には対応要？

lib/ogp/Parser.php

@@ -0,0 +1,115 @@
+<?php
+
+/**
+ * @file
+ * Open Graph Protocol parser.
+ * Very simple open graph parser that parses open graph headers out of a given bit of php.
+ * 
+ * Example:
+ * 
+ * <code>
+ * $content = file_get_contents("https://www.youtube.com/watch?v=EIGGsZZWzZA");
+ * 
+ * print_r(\ogp\Parser::parse($content));
+ * </code>
+ * 
+ * @author Marcus Povey <marcus@marcus-povey.co.uk>
+ * @licence GPL2
+ */
+
+namespace ogp {
+
+    use DOMDocument;
+
+    class Parser {
+
+	/**
+	 * Parse content into an array.
+	 * @param $content html The HTML
+	 * @return array
+	 */
+	public static function parse($content) {
+
+	    $doc = new \DOMDocument();
+
+            // Fudge to handle a situation when an encoding isn't present
+            if (strpos($content, 'xml encoding=')===false)
+                $content = '<?xml encoding="utf-8" ?>' . $content;
+
+            @$doc->loadHTML($content);
+
+            $interested_in = ['og', 'fb', 'twitter']; // Open graph namespaces we're interested in (open graph + extensions)
+
+            $ogp = [];
+
+            // Open graph
+            $metas = $doc->getElementsByTagName('meta');
+            if (!empty($metas)) {
+                for ($n = 0; $n < $metas->length; $n++) {
+
+                    $meta = $metas->item($n);
+
+                    foreach (array('name', 'property') as $name) {
+                        $meta_bits = explode(':', $meta->getAttribute($name));
+                        if (in_array($meta_bits[0], $interested_in)) {
+
+                            // If we're adding to an existing element, convert it to an array
+                            if (isset($ogp[$meta->getAttribute($name)]) && (!is_array($ogp[$meta->getAttribute($name)])))
+                                $ogp[$meta_bits[0]][$meta->getAttribute($name)] = array($ogp[$meta->getAttribute($name)], $meta->getAttribute('content'));
+                            else if (isset($ogp[$meta->getAttribute($name)]) && (is_array($ogp[$meta->getAttribute($name)])))
+                                $ogp[$meta_bits[0]][$meta->getAttribute($name)][] = $meta->getAttribute('content');
+                            else
+                                $ogp[$meta_bits[0]][$meta->getAttribute($name)] = $meta->getAttribute('content');
+                        }
+                    }
+                }
+            }
+
+            // OEmbed
+            $metas = $doc->getElementsByTagName('link');
+            if (!empty($metas)) {
+                for ($n = 0; $n < $metas->length; $n++) {
+
+                    $meta = $metas->item($n);
+
+                    if (strtolower($meta->getAttribute('rel')) == 'alternate') {
+
+                        if (in_array(strtolower($meta->getAttribute('type')), ['application/json+oembed'])) {
+                            $ogp['oembed']['jsonp'][] = $meta->getAttribute('href');
+                        }
+                        if (in_array(strtolower($meta->getAttribute('type')), ['text/json+oembed'])) {
+                            $ogp['oembed']['json'][] = $meta->getAttribute('href');
+                        }
+                        if (in_array(strtolower($meta->getAttribute('type')), ['text/xml+oembed'])) {
+                            $ogp['oembed']['xml'][] = $meta->getAttribute('href');
+                        }
+                    }
+                }
+            }
+
+            // Basics
+            foreach (['title'] as $basic) {
+                if (preg_match("#<$basic>(.*?)</$basic>#siu", $content, $matches))
+                    $ogp[$basic] = trim($matches[1], " \n");
+            }
+            $metas = $doc->getElementsByTagName('meta');
+            if (!empty($metas)) {
+                for ($n = 0; $n < $metas->length; $n++) {
+
+                    $meta = $metas->item($n);
+
+                    if (strtolower($meta->getAttribute('name')) == 'description') {
+                        $ogp['description'] = $meta->getAttribute('content');
+                    }
+                    if (strtolower($meta->getAttribute('name')) == 'keywords') {
+                        $ogp['keywords'] = $meta->getAttribute('content');
+                    }
+                }
+            }
+
+	    return $ogp;
+	}
+
+    }
+
+}

lib/se-func-shortcode.php

@@ -92,10 +92,73 @@ function sentry_bubble_handler( $atts, $content = null ){
   }
 }
 
+function sentry_link_handler ( $atts ){
+  extract( shortcode_atts( array(
+    'url' => '',
+  ) ,$atts ) );
+
+  $url = strip_tags($url);
+
+  // TODO: 自サイトのURLならIDで取得
+
+  if ( !$url ) return;
+
+  $ogp = get_transient( 'outlink-'.$url );
+
+  if ( $ogp === false ){
+
+    require_once('ogp/Parser.php');
+    $content = file_get_contents($url);
+    $ogp = \ogp\Parser::parse($content);
+
+    if ( !empty($ogp) ){
+      set_transient( 'outlink-'.$url, $ogp, DAY_IN_SECONDS  );
+    }
+  }
+
+  $faviconUrl =  "http://www.google.com/s2/favicons?domain=". $url;
+  $parse_url = parse_url( $url );
+
+  if ( empty($ogp) ){
+    return "<div class='outlink is-simple'><a href='" . $url . "' target='_blank' />" . $url . "</a></div>";
+  } else {
+    $outHTML ="";
+
+    $outHTML = '<div class="outlink is-blogcard">';
+    $outHTML .= '<a href="' . $ogp['og']['og:url'] . '" rel="bookmark" title="' . $ogp['og']['og:title'] . '">';
+    $outHTML .= '<div class="blogcard-content">';
+    $outHTML .= '<figure class="thumbnail">';
+    if ( $ogp['og']['og:image'] !== "" ){
+      $outHTML .= '<img src="' . $ogp['og']['og:image'] . '"/>';
+    }else{
+      $outHTML .= '<img src="' . get_default_image_uri(300). '" alt="no image" title="no image" width="300" height="300" />';
+    }
+    $outHTML .= '</figure>';
+    $outHTML .= '<div class="blogcard-body">';
+    $outHTML .= '<div class="blogcard-title">' . $ogp['og']['og:title'] . '</div>';
+    $outHTML .= '<div class="blogcard-description">' . mb_strimwidth( $ogp['og']['og:description'], 0, 160) . '...</div>';
+    $outHTML .= '</div>'; // .blogcard-body
+    $outHTML .= '</div>'; // .blogcard-content
+    $outHTML .= '<div class="blogcard-sitename">';
+    $outHTML .= '<img src="'. $faviconUrl .'" />';
+    if ( $ogp['og']['og:site_name'] ){
+      $outHTML .= $ogp['og']['og:site_name'];
+    } else {
+      $parse_url['scheme'] . '://' . $parse_url['host'];
+    }
+    $outHTML .= '</div>'; // .blogcard-sitename
+    $outHTML .= '</a>';
+    $outHTML .= '</div>';
+
+    return $outHTML;
+  }
+}
+
 add_shortcode( 'marker', 'marker_handler' );
 add_shortcode( 'font', 'font_handler' );
 add_shortcode( 'post', 'post_handler' );
 add_shortcode( 'notification', 'notification_handler');
 add_shortcode( 'ad', 'sentry_ad_handler' );
 add_shortcode( 'bubble', 'sentry_bubble_handler');
+add_shortcode( 'link', 'sentry_link_handler');
 ?>