#36: support .msg and .eml files

QuickLook.Plugin/QuickLook.Plugin.MailViewer/Plugin.cs

@@ -0,0 +1,101 @@
+// Copyright <20> 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System;
+using System.IO;
+using System.Windows;
+using System.Windows.Threading;
+using MsgReader;
+using QuickLook.Plugin.HtmlViewer;
+
+namespace QuickLook.Plugin.MailViewer
+{
+    public class Plugin : IViewer
+    {
+        private WebpagePanel _panel;
+        private string tmpDir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
+
+        public int Priority => int.MaxValue;
+        public bool AllowsTransparency => false;
+
+        public void Init()
+        {
+        }
+
+        public bool CanHandle(string path)
+        {
+            if (Directory.Exists(path))
+                return false;
+
+            switch (Path.GetExtension(path).ToLower())
+            {
+                case ".eml":
+                case ".msg":
+                    return true;
+
+                default:
+                    return false;
+            }
+        }
+
+        public void Prepare(string path, ContextObject context)
+        {
+            context.PreferredSize = new Size {Width = 1000, Height = 600};
+        }
+
+        public void View(string path, ContextObject context)
+        {
+            _panel = new WebpagePanel();
+            context.ViewerContent = _panel;
+            context.Title = Path.GetFileName(path);
+
+            _panel.Navigate(ExtractMailBody(path));
+            _panel.Dispatcher.Invoke(() => { context.IsBusy = false; }, DispatcherPriority.Loaded);
+        }
+
+        public void Cleanup()
+        {
+            GC.SuppressFinalize(this);
+
+            _panel?.Dispose();
+            _panel = null;
+
+            if (Directory.Exists(tmpDir))
+                Directory.Delete(tmpDir, true);
+        }
+
+        private string ExtractMailBody(string path)
+        {
+            tmpDir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString());
+            Directory.CreateDirectory(tmpDir);
+
+            var msg = new Reader();
+
+            var files = msg.ExtractToFolder(path, tmpDir, true);
+
+            if (files.Length > 0 && !string.IsNullOrEmpty(files[0]))
+                return files[0];
+
+            throw new Exception($"{path} is not a valid msg file.");
+        }
+
+        ~Plugin()
+        {
+            Cleanup();
+        }
+    }
+}