From 7710fd79fb37290dd257325af640a87de049b87c Mon Sep 17 00:00:00 2001
From: Marius <maerious@gmail.com>
Date: Tue, 31 Jan 2017 16:58:31 +0100
Subject: [PATCH] Correct parsing Upload-Concat for final uplaods

Addresses https://github.com/tus/tus-resumable-upload-protocol/issues/123
---
 concat_test.go      | 11 +++++++----
 post_test.go        |  2 +-
 unrouted_handler.go | 11 +++++++----
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/concat_test.go b/concat_test.go
index 8cfd138..e223c42 100644
--- a/concat_test.go
+++ b/concat_test.go
@@ -118,6 +118,9 @@ func TestConcat(t *testing.T) {
 				Method: "POST",
 				ReqHeader: map[string]string{
 					"Tus-Resumable": "1.0.0",
+					// A space between `final;` and the first URL should be allowed due to
+					// compatibility reasons, even if the specification does not define
+					// it. Therefore this character is included in this test case.
 					"Upload-Concat": "final; http://tus.io/files/a /files/b/",
 				},
 				Code: http.StatusCreated,
@@ -153,7 +156,7 @@ func TestConcat(t *testing.T) {
 				},
 				Code: http.StatusOK,
 				ResHeader: map[string]string{
-					"Upload-Concat": "final; http://tus.io/files/a http://tus.io/files/b",
+					"Upload-Concat": "final;http://tus.io/files/a http://tus.io/files/b",
 					"Upload-Length": "10",
 					"Upload-Offset": "10",
 				},
@@ -178,7 +181,7 @@ func TestConcat(t *testing.T) {
 				Method: "POST",
 				ReqHeader: map[string]string{
 					"Tus-Resumable": "1.0.0",
-					"Upload-Concat": "final; http://tus.io/files/c",
+					"Upload-Concat": "final;http://tus.io/files/c",
 				},
 				Code: http.StatusBadRequest,
 			}).Run(handler, t)
@@ -200,7 +203,7 @@ func TestConcat(t *testing.T) {
 				Method: "POST",
 				ReqHeader: map[string]string{
 					"Tus-Resumable": "1.0.0",
-					"Upload-Concat": "final; /files/huge",
+					"Upload-Concat": "final;/files/huge",
 				},
 				Code: http.StatusRequestEntityTooLarge,
 			}).Run(handler, t)
@@ -240,7 +243,7 @@ func TestConcat(t *testing.T) {
 				URL:    "",
 				ReqHeader: map[string]string{
 					"Tus-Resumable": "1.0.0",
-					"Upload-Concat": "final; ",
+					"Upload-Concat": "final;",
 				},
 				Code: http.StatusBadRequest,
 			}).Run(handler, t)
diff --git a/post_test.go b/post_test.go
index 901f5fb..605ad7c 100644
--- a/post_test.go
+++ b/post_test.go
@@ -294,7 +294,7 @@ func TestPost(t *testing.T) {
 					"Tus-Resumable": "1.0.0",
 					"Upload-Length": "300",
 					"Content-Type":  "application/offset+octet-stream",
-					"Upload-Concat": "final; http://tus.io/files/a http://tus.io/files/b",
+					"Upload-Concat": "final;http://tus.io/files/a http://tus.io/files/b",
 				},
 				ReqBody: strings.NewReader("hello"),
 				Code:    http.StatusForbidden,
diff --git a/unrouted_handler.go b/unrouted_handler.go
index 74bc6e9..7886ef2 100644
--- a/unrouted_handler.go
+++ b/unrouted_handler.go
@@ -341,8 +341,11 @@ func (handler *UnroutedHandler) HeadFile(w http.ResponseWriter, r *http.Request)
 	if info.IsFinal {
 		v := "final;"
 		for _, uploadID := range info.PartialUploads {
-			v += " " + handler.absFileURL(r, uploadID)
+			v += handler.absFileURL(r, uploadID) + " "
 		}
+		// Remove trailing space
+		v = v[:len(v)-1]
+
 		w.Header().Set("Upload-Concat", v)
 	}
 
@@ -782,7 +785,7 @@ func serializeMeta(meta map[string]string) string {
 
 // Parse the Upload-Concat header, e.g.
 // Upload-Concat: partial
-// Upload-Concat: final; http://tus.io/files/a /files/b/
+// Upload-Concat: final;http://tus.io/files/a /files/b/
 func parseConcat(header string) (isPartial bool, isFinal bool, partialUploads []string, err error) {
 	if len(header) == 0 {
 		return
@@ -793,8 +796,8 @@ func parseConcat(header string) (isPartial bool, isFinal bool, partialUploads []
 		return
 	}
 
-	l := len("final; ")
-	if strings.HasPrefix(header, "final; ") && len(header) > l {
+	l := len("final;")
+	if strings.HasPrefix(header, "final;") && len(header) > l {
 		isFinal = true
 
 		list := strings.Split(header[l:], " ")