From ae4702f5f0d9f4507e3de3f1d52628875be4ee35 Mon Sep 17 00:00:00 2001
From: Dustin Moris Gorski <dustinmoris@gmail.com>
Date: Thu, 26 Nov 2020 22:13:32 +0000
Subject: [PATCH] Fixes #449

---
 RELEASE_NOTES.md            |  4 ++++
 src/Giraffe/ModelBinding.fs | 19 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 339fc2e3..de68c54e 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,6 +1,10 @@
 Release Notes
 =============
 
+## 5.0.0-rc-3
+
+- Added `ReadBodyBufferedFromRequestAsync` extension method to buffer and read a the request body and make subsequent reads possible (see [#449](https://github.com/giraffe-fsharp/Giraffe/issues/449))
+
 ## 5.0.0-rc-2
 
 - Fixed pre-conditions validation issue (see [#424](https://github.com/giraffe-fsharp/Giraffe/issues/424))
diff --git a/src/Giraffe/ModelBinding.fs b/src/Giraffe/ModelBinding.fs
index 6c047076..a14ce434 100644
--- a/src/Giraffe/ModelBinding.fs
+++ b/src/Giraffe/ModelBinding.fs
@@ -365,6 +365,25 @@ type HttpContext with
             return! reader.ReadToEndAsync()
         }
 
+    /// <summary>
+    /// Reads the entire body of the <see cref="Microsoft.AspNetCore.Http.HttpRequest"/> asynchronously and returns it as a <see cref="System.String"/> value.
+    /// This method buffers the response and makes subsequent reads possible.
+    /// </summary>
+    /// <returns>Returns the contents of the request body as a <see cref="System.Threading.Tasks.Task{System.String}"/>.</returns>
+    member this.ReadBodyBufferedFromRequestAsync() =
+        task {
+            this.Request.EnableBuffering()
+            use reader =
+                new StreamReader(
+                    this.Request.Body,
+                    encoding = Encoding.UTF8,
+                    detectEncodingFromByteOrderMarks = false,
+                    leaveOpen = true)
+            let! body = reader.ReadToEndAsync()
+            this.Request.Body.Position <- 0L
+            return body
+        }
+
     /// <summary>
     /// Uses the <see cref="IJsonSerializer"/> to deserializes the entire body of the <see cref="Microsoft.AspNetCore.Http.HttpRequest"/> asynchronously into an object of type 'T.
     /// </summary>