Implement PatternAsFile for StringMatcher (#651)

src/WireMock.Net.Abstractions/Admin/Mappings/MatcherModel.cs

@@ -1,4 +1,4 @@
-namespace WireMock.Admin.Mappings
+namespace WireMock.Admin.Mappings
 {
     /// <summary>
     /// MatcherModel
@@ -12,15 +12,20 @@
         public string Name { get; set; }
 
         /// <summary>
-        /// Gets or sets the pattern. Can be a string (default) or an object;
+        /// Gets or sets the pattern. Can be a string (default) or an object.
         /// </summary>
         public object Pattern { get; set; }
 
         /// <summary>
-        /// Gets or sets the patterns. Can be array of strings (default) or an array of objects;
+        /// Gets or sets the patterns. Can be array of strings (default) or an array of objects.
         /// </summary>
         public object[] Patterns { get; set; }
 
+        /// <summary>
+        /// Gets or sets the pattern as a file.
+        /// </summary>
+        public string PatternAsFile { get; set; }
+
         /// <summary>
         /// Gets or sets the ignore case.
         /// </summary>

src/WireMock.Net.Abstractions/Handlers/IFileSystemHandler.cs

@@ -1,4 +1,4 @@
-using JetBrains.Annotations;
+using JetBrains.Annotations;
 using System.Collections.Generic;
 
 namespace WireMock.Handlers
@@ -89,5 +89,12 @@ namespace WireMock.Handlers
         /// <param name="filename">The filename.</param>
         /// <returns>The file content as bytes.</returns>
         byte[] ReadFile([NotNull] string filename);
+
+        /// <summary>
+        /// Read a file as string.
+        /// </summary>
+        /// <param name="filename">The filename.</param>
+        /// <returns>The file content as a string.</returns>
+        string ReadFileAsString([NotNull] string filename);
     }
 }