From 968c252a2ed0254fe2ffe699167ba2acb7d3844a Mon Sep 17 00:00:00 2001
From: Neal Leverenz <neal_leverenz@trimble.com>
Date: Wed, 5 Oct 2022 09:22:01 -0400
Subject: [PATCH 1/2] Add support to get a list of extensions

---
 src/MimeTypesMap/MimeTypesMap.cs      | 10 ++++++++++
 src/MimeTypesMap/MimeTypesMap.tt      | 10 ++++++++++
 test/MimeTypesMapTests/SimpleTests.cs | 16 +++++++++++++++-
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/MimeTypesMap/MimeTypesMap.cs b/src/MimeTypesMap/MimeTypesMap.cs
index 7c6c77f..bd739db 100644
--- a/src/MimeTypesMap/MimeTypesMap.cs
+++ b/src/MimeTypesMap/MimeTypesMap.cs
@@ -1008,6 +1008,16 @@ public static string GetExtension(string mime)
             return _defaultExtension;
         }
 
+        public static IEnumerable<string> GetExtensions(string mime)
+        {
+            var ext = _mimeTypeMap.Value.Where(x => x.Value.Contains(mime)).Select(x => x.Key);
+            if (ext != null)
+            {
+                return ext;
+            }
+            return new List<string> { "???" };
+        }
+
         public static string GetMimeType(string fileName)
         {
             string ext = fileName;
diff --git a/src/MimeTypesMap/MimeTypesMap.tt b/src/MimeTypesMap/MimeTypesMap.tt
index b08d2ac..306924c 100644
--- a/src/MimeTypesMap/MimeTypesMap.tt
+++ b/src/MimeTypesMap/MimeTypesMap.tt
@@ -38,6 +38,16 @@ namespace HeyRed.Mime
             return _defaultExtension;
         }
 
+        public static IEnumerable<string> GetExtensions(string mime)
+        {
+            var ext = _mimeTypeMap.Value.Where(x => x.Value.Contains(mime)).Select(x => x.Key);
+            if (ext != null)
+            {
+                return ext;
+            }
+            return new List<string> { "???" };
+        }
+
         public static string GetMimeType(string fileName)
         {
             string ext = fileName;
diff --git a/test/MimeTypesMapTests/SimpleTests.cs b/test/MimeTypesMapTests/SimpleTests.cs
index b78e116..558aecd 100644
--- a/test/MimeTypesMapTests/SimpleTests.cs
+++ b/test/MimeTypesMapTests/SimpleTests.cs
@@ -1,4 +1,5 @@
-using HeyRed.Mime;
+using System.Collections.Generic;
+using HeyRed.Mime;
 using Xunit;
 
 namespace MimeTypesMapTests
@@ -32,6 +33,19 @@ public void GetExtension()
             var ext = MimeTypesMap.GetExtension("image/jpeg");
             Assert.Equal("jpeg", ext);
         }
+
+        [Fact]
+        public void GetExtensions()
+        {
+            var expected = new List<string>
+            {
+                "ai",
+                "eps",
+                "ps"
+            };
+            var exts = MimeTypesMap.GetExtensions("application/postscript");
+            Assert.Equal(expected, exts);
+        }
         
         [Fact]
         public void AddOrUpdate()

From 17e50d3dc65a399ced7cf914587e3d304bc9fccf Mon Sep 17 00:00:00 2001
From: Neal Leverenz <neal_leverenz@trimble.com>
Date: Fri, 7 Oct 2022 08:16:53 -0400
Subject: [PATCH 2/2] Update "???" to use _defaultExtension

---
 src/MimeTypesMap/MimeTypesMap.cs | 2 +-
 src/MimeTypesMap/MimeTypesMap.tt | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/MimeTypesMap/MimeTypesMap.cs b/src/MimeTypesMap/MimeTypesMap.cs
index bd739db..2bc8b3d 100644
--- a/src/MimeTypesMap/MimeTypesMap.cs
+++ b/src/MimeTypesMap/MimeTypesMap.cs
@@ -1015,7 +1015,7 @@ public static IEnumerable<string> GetExtensions(string mime)
             {
                 return ext;
             }
-            return new List<string> { "???" };
+            return new List<string> { _defaultExtension };
         }
 
         public static string GetMimeType(string fileName)
diff --git a/src/MimeTypesMap/MimeTypesMap.tt b/src/MimeTypesMap/MimeTypesMap.tt
index 306924c..7c5724c 100644
--- a/src/MimeTypesMap/MimeTypesMap.tt
+++ b/src/MimeTypesMap/MimeTypesMap.tt
@@ -45,7 +45,7 @@ namespace HeyRed.Mime
             {
                 return ext;
             }
-            return new List<string> { "???" };
+            return new List<string> { _defaultExtension };
         }
 
         public static string GetMimeType(string fileName)