Update HtmlPreviewVisitor to handle text/calender scheduling events (#1119)

* Update HtmlPreviewVisitor to handle text/calender scheduling events

* Fix text/calendar handling in HtmlPreviewVisitor

---------

Co-authored-by: Jeffrey Stedfast <[email protected]>

Author: TimBo93

FAQ.md

@@ -264,6 +264,8 @@ class HtmlPreviewVisitor : MimeVisitor
 {
     List<MultipartRelated> stack = new List<MultipartRelated> ();
     List<MimeEntity> attachments = new List<MimeEntity> ();
+    List<MimeEntity> calenderAttachments = new List<MimeEntity> ();
+
     readonly string tempDir;
     string body;
 
@@ -283,6 +285,13 @@ class HtmlPreviewVisitor : MimeVisitor
         get { return attachments; }
     }
 
+    /// <summary>
+    /// The list of text/calender entries that were in the MimeMessage.
+    /// </summary>
+    public IList<MimeEntity> CalenderAttachments {
+        get { return calenderAttachments; }
+    }
+
     /// <summary>
     /// The HTML string that can be set on the BrowserControl.
     /// </summary>
@@ -459,6 +468,12 @@ class HtmlPreviewVisitor : MimeVisitor
     {
         TextConverter converter;
 
+        // treat text/calendar parts as attachments rather than message bodies
+        if (entity.ContentType.IsMimeType ("text", "calendar")) {
+            calendarAattachments.Add (entity);
+            return;
+        }
+
         if (body != null) {
             // since we've already found the body, treat this as an attachment
             attachments.Add (entity);

samples/MessageReader.Android/MessageReader.Android/HtmlPreviewVisitor.cs

@@ -42,6 +42,8 @@ class HtmlPreviewVisitor : MimeVisitor
 	{
 		readonly List<MultipartRelated> stack = new List<MultipartRelated> ();
 		readonly List<MimeEntity> attachments = new List<MimeEntity> ();
+		readonly List<MimeEntity> calenderAttachments = new List<MimeEntity> ();
+
 		readonly WebView webView;
 		bool renderedBody;
 
@@ -60,6 +62,13 @@ public IList<MimeEntity> Attachments {
 			get { return attachments; }
 		}
 
+		/// <summary>
+		/// The list of text/calender entries that were in the MimeMessage.
+		/// </summary>
+		public IList<MimeEntity> CalenderAttachments {
+			get { return calenderAttachments; }
+		}
+
 		protected override void VisitMultipartAlternative (MultipartAlternative alternative)
 		{
 			// walk the multipart/alternative children backwards from greatest level of faithfulness to the least faithful
@@ -127,6 +136,12 @@ protected override void VisitTextPart (TextPart entity)
 		{
 			TextConverter converter;
 
+			// treat text/calendar parts as attachments rather than message bodies
+			if (entity.ContentType.IsMimeType ("text", "calendar")) {
+				calenderAttachments.Add (entity);
+				return;
+			}
+
 			if (renderedBody) {
 				// since we've already found the body, treat this as an attachment
 				attachments.Add (entity);

samples/MessageReader.iOS/MessageReader.iOS/HtmlPreviewVisitor.cs

@@ -1,4 +1,4 @@
-//
+//
 // HtmlPreviewVisitor.cs
 //
 // Author: Jeffrey Stedfast <[email protected]>
@@ -42,6 +42,8 @@ class HtmlPreviewVisitor : MimeVisitor
 	{
 		readonly List<MultipartRelated> stack = new List<MultipartRelated> ();
 		readonly List<MimeEntity> attachments = new List<MimeEntity> ();
+		readonly List<MimeEntity> calenderAttachments = new List<MimeEntity> ();
+
 		readonly UIWebView webView;
 		bool renderedBody;
 
@@ -60,6 +62,13 @@ public IList<MimeEntity> Attachments {
 			get { return attachments; }
 		}
 
+		/// <summary>
+		/// The list of text/calender entries that were in the MimeMessage.
+		/// </summary>
+		public IList<MimeEntity> CalenderAttachments {
+			get { return calenderAttachments; }
+		}
+
 		protected override void VisitMultipartAlternative (MultipartAlternative alternative)
 		{
 			// walk the multipart/alternative children backwards from greatest level of faithfulness to the least faithful
@@ -127,6 +136,12 @@ protected override void VisitTextPart (TextPart entity)
 		{
 			TextConverter converter;
 
+			// treat text/calendar parts as attachments rather than message bodies
+			if (entity.ContentType.IsMimeType ("text", "calendar")) {
+				calenderAttachments.Add (entity);
+				return;
+			}
+
 			if (renderedBody) {
 				// since we've already found the body, treat this as an attachment
 				attachments.Add (entity);

samples/MessageReader/MessageReader/HtmlPreviewVisitor.cs

@@ -41,6 +41,8 @@ class HtmlPreviewVisitor : MimeVisitor
 	{
 		readonly List<MultipartRelated> stack = new List<MultipartRelated> ();
 		readonly List<MimeEntity> attachments = new List<MimeEntity> ();
+		readonly List<MimeEntity> calenderAttachments = new List<MimeEntity> ();
+
 		string body;
 
 		/// <summary>
@@ -57,6 +59,13 @@ public IList<MimeEntity> Attachments {
 			get { return attachments; }
 		}
 
+		/// <summary>
+		/// The list of text/calender entries that were in the MimeMessage.
+		/// </summary>
+		public IList<MimeEntity> CalenderAttachments {
+			get { return calenderAttachments; }
+		}
+
 		/// <summary>
 		/// The HTML string that can be set on the BrowserControl.
 		/// </summary>
@@ -206,6 +215,12 @@ protected override void VisitTextPart (TextPart entity)
 		{
 			TextConverter converter;
 
+			// treat text/calendar parts as attachments rather than message bodies
+			if (entity.ContentType.IsMimeType ("text", "calendar")) {
+				calenderAttachments.Add (entity);
+				return;
+			}
+
 			if (body != null) {
 				// since we've already found the body, treat this as an attachment
 				attachments.Add (entity);