thumbnail generator for epubs

2 files changed, 41 insertions, 1 deletions

diff --git a/Zotlabs/Daemon/Thumbnail.php b/Zotlabs/Daemon/Thumbnail.php
index caf5dd3ae..b3e539086 100644
--- a/Zotlabs/Daemon/Thumbnail.php
+++ b/Zotlabs/Daemon/Thumbnail.php
@@ -45,7 +45,9 @@ class Thumbnail {
 				}
 			}
 		}
-		if(($default_controller) && (! file_exists(dbunescbin($attach['content']) . '.thumb'))) {
+		if(($default_controller) 
+			&& ((! file_exists(dbunescbin($attach['content']) . '.thumb')) 
+				|| (filectime(dbunescbin($attach['content']) . 'thumb') < (time() - 60)))) {
 			$default_controller->Thumb($attach,$preview_style,$preview_width,$preview_height);
 		}
 	}
diff --git a/Zotlabs/Thumbs/Epubthumb.php b/Zotlabs/Thumbs/Epubthumb.php
new file mode 100644
index 000000000..4213b5267
--- /dev/null
+++ b/Zotlabs/Thumbs/Epubthumb.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Zotlabs\Thumbs;
+
+require_once('library/epub-meta/epub.php');
+
+class Epubthumb {
+
+	function Match($type) {
+		return(($type === 'application/epub+zip') ? true : false );
+	}
+
+	function Thumb($attach,$preview_style,$height = 300, $width = 300) {
+
+		$photo = false;
+
+		$ep = new \Epub(dbunescbin($attach['content']));
+		$data = $ep->Cover();
+
+		if($data['found']) {
+			$photo = $data['data'];
+		}
+
+        if($photo) {
+			$image = imagecreatefromstring($photo);
+			$dest = imagecreatetruecolor( $width, $height );
+	        $srcwidth = imagesx($image);
+    	    $srcheight = imagesy($image);
+
+        	imagealphablending($dest, false);
+			imagesavealpha($dest, true);
+        	imagecopyresampled($dest, $image, 0, 0, 0, 0, $width, $height, $srcwidth, $srcheight);
+            imagedestroy($image);
+			imagejpeg($dest,dbunescbin($attach['content']) . '.thumb');
+		}
+	}
+}
+