added support for style attribute. fix bug in image attachment.

src/Postal.AspNetCore/HtmlExtensions.cs

@@ -24,19 +24,18 @@ public static class HtmlExtensions
         /// <param name="imagePathOrUrl">An image file path or URL. A file path can be relative to the web application root directory.</param>
         /// <param name="alt">The content for the &lt;img alt&gt; attribute.</param>
         /// <returns>An HTML &lt;img&gt; tag.</returns>
-        public static IHtmlContent EmbedImage(this IHtmlHelper html, string imagePathOrUrl, string alt = "")
+        public static IHtmlContent EmbedImage(this IHtmlHelper html, string imagePathOrUrl, string alt = "", string style = "")
         {
             if (string.IsNullOrWhiteSpace(imagePathOrUrl)) throw new ArgumentException("Path or URL required", "imagePathOrUrl");
 
             if (IsFileName(imagePathOrUrl))
             {
                 var hosting = html.ViewContext.HttpContext.RequestServices.GetService<IHostingEnvironment>();
-                string webRootPath = hosting.WebRootPath;
-                imagePathOrUrl = System.IO.Path.Combine(webRootPath, imagePathOrUrl);
+                imagePathOrUrl = hosting.WebRootPath + System.IO.Path.DirectorySeparatorChar + imagePathOrUrl.Replace('/', System.IO.Path.DirectorySeparatorChar).Replace('\\', System.IO.Path.DirectorySeparatorChar);
             }
             var imageEmbedder = (ImageEmbedder)html.ViewData[ImageEmbedder.ViewDataKey];
             var resource = imageEmbedder.ReferenceImage(imagePathOrUrl);
-            return new HtmlString(string.Format("<img src=\"cid:{0}\" alt=\"{1}\"/>", resource.ContentId, html.Encode(alt)));
+            return new HtmlString(string.Format("<img src=\"cid:{0}\" alt=\"{1}\" style=\"{2}\"/>", resource.ContentId, html.Encode(alt), html.Encode(style)));
         }
 
         static bool IsFileName(string pathOrUrl)