Improved string escaping and added it to multipart stringcontents

RuriLib/Blocks/BlockTCP.cs

@@ -247,7 +247,7 @@ namespace RuriLib
 
                     var msg = ReplaceValues(Message, data);
                     byte[] b = { };
-                    var payload = Encoding.ASCII.GetBytes(msg.Replace(@"\r\n", "\r\n"));
+                    var payload = Encoding.ASCII.GetBytes(msg.Unescape());
 
                     // Manual implementation of the WebSocket frame
                     if (WebSocket)

RuriLib/Extensions.cs

@@ -29,4 +29,37 @@ namespace RuriLib
             }
         }
     }
+
+    /// <summary>
+    /// Extension methods for strings.
+    /// </summary>
+    public static class StringExtensions
+    {
+        /// <summary>
+        /// Replaces literal values of \n, \r\n and \t with the actual escape codes.
+        /// </summary>
+        /// <param name="str">The string to unescape</param>
+        /// <param name="useEnvNewLine">Whether to unescape both \n and \r\n with the Environment.NewLine</param>
+        /// <returns>The string with unescaped escape sequences.</returns>
+        public static string Unescape(this string str, bool useEnvNewLine = false)
+        {
+            var stringBuilder = new StringBuilder(str)
+                .Replace(@"\t", "\t");
+
+            if (useEnvNewLine)
+            {
+                stringBuilder
+                    .Replace(@"\n", Environment.NewLine)
+                    .Replace(@"\r\n", Environment.NewLine);
+            }
+            else
+            {
+                stringBuilder
+                    .Replace(@"\n", "\n")
+                    .Replace(@"\r\n", "\r\n");
+            }
+
+            return stringBuilder.ToString();
+        }
+    }
 }

RuriLib/Functions/Requests/Request.cs

@@ -74,7 +74,7 @@ namespace RuriLib.Functions.Requests
             HttpMethod method = HttpMethod.POST, bool encodeContent = false, List<LogEntry> log = null)
         {
             this.contentType = contentType;
-            var pData = Regex.Replace(postData, @"(?<!\\)\\n", Environment.NewLine).Replace(@"\\n", @"\n");
+            var pData = Regex.Replace(postData, @"(?<!\\)\\n", Environment.NewLine).Unescape();
 
             if (HttpRequest.CanContainRequestBody(method))
             {
@@ -136,7 +136,7 @@ namespace RuriLib.Functions.Requests
                 if (c.Type == MultipartContentType.String)
                 {
                     mContent.Add(new StringContent(c.Value), c.Name);
-                    if (log != null) log.Add(new LogEntry($"Content-Disposition: form-data; name=\"{c.Name}\"{Environment.NewLine}{Environment.NewLine}{c.Value}", Colors.MediumTurquoise));
+                    if (log != null) log.Add(new LogEntry($"Content-Disposition: form-data; name=\"{c.Name}\"{Environment.NewLine}{Environment.NewLine}{c.Value.Unescape()}", Colors.MediumTurquoise));
                 }
                 else if (c.Type == MultipartContentType.File)
                 {