From 130486b71fa458df01e9a1f001881ac857d637da Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Erik=20Pedersen?=
 <bjorn.erik.pedersen@gmail.com>
Date: Mon, 5 Oct 2020 17:56:28 +0200
Subject: [PATCH] Add force flag to server redirects config

Fixes #7778
---
 commands/server.go                            | 36 ++++++++++++++-----
 config/commonConfig.go                        |  1 +
 .../en/getting-started/configuration.md       |  4 +--
 3 files changed, 30 insertions(+), 11 deletions(-)

diff --git a/commands/server.go b/commands/server.go
index 60252725319..7d604b97d55 100644
--- a/commands/server.go
+++ b/commands/server.go
@@ -376,17 +376,36 @@ func (f *fileServer) createEndpoint(i int) (*http.ServeMux, string, string, erro
 			}
 
 			if redirect := f.c.serverConfig.MatchRedirect(requestURI); !redirect.IsZero() {
+				doRedirect := true
 				// This matches Netlify's behaviour and is needed for SPA behaviour.
 				// See https://docs.netlify.com/routing/redirects/rewrites-proxies/
-				if redirect.Status == 200 {
-					if r2 := f.rewriteRequest(r, strings.TrimPrefix(redirect.To, u.Path)); r2 != nil {
-						requestURI = redirect.To
-						r = r2
+				if !redirect.Force {
+					path := filepath.Clean(strings.TrimPrefix(requestURI, u.Path))
+					fi, err := f.c.hugo().BaseFs.PublishFs.Stat(path)
+					if err == nil {
+						if fi.IsDir() {
+							// There will be overlapping directories, so we
+							// need to check for a file.
+							_, err = f.c.hugo().BaseFs.PublishFs.Stat(filepath.Join(path, "index.html"))
+							doRedirect = err != nil
+						} else {
+							doRedirect = false
+						}
+
+					}
+				}
+
+				if doRedirect {
+					if redirect.Status == 200 {
+						if r2 := f.rewriteRequest(r, strings.TrimPrefix(redirect.To, u.Path)); r2 != nil {
+							requestURI = redirect.To
+							r = r2
+						}
+					} else {
+						w.Header().Set("Content-Type", "")
+						http.Redirect(w, r, redirect.To, redirect.Status)
+						return
 					}
-				} else {
-					w.Header().Set("Content-Type", "")
-					http.Redirect(w, r, redirect.To, redirect.Status)
-					return
 				}
 
 			}
@@ -416,7 +435,6 @@ func (f *fileServer) createEndpoint(i int) (*http.ServeMux, string, string, erro
 
 	fileserver := decorate(http.FileServer(fs))
 	mu := http.NewServeMux()
-
 	if u.Path == "" || u.Path == "/" {
 		mu.Handle("/", fileserver)
 	} else {
diff --git a/config/commonConfig.go b/config/commonConfig.go
index ac82dc3bc98..522ced85412 100644
--- a/config/commonConfig.go
+++ b/config/commonConfig.go
@@ -184,6 +184,7 @@ type Redirect struct {
 	From   string
 	To     string
 	Status int
+	Force  bool
 }
 
 func (r Redirect) IsZero() bool {
diff --git a/docs/content/en/getting-started/configuration.md b/docs/content/en/getting-started/configuration.md
index 076d9161ccf..9cbe988f198 100644
--- a/docs/content/en/getting-started/configuration.md
+++ b/docs/content/en/getting-started/configuration.md
@@ -360,10 +360,10 @@ Note that a `status` code of 200 will trigger a [URL rewrite](https://docs.netli
 from = "/myspa/**"
 to = "/myspa/"
 status = 200
+force = false
 {{< /code-toggle >}}
 
-
-
+{{< new-in "0.76.0" >}} Setting `force=true` will make a redirect even if there is existing content in the path. Note that before Hugo 0.76  `force` was the default behaviour, but this is inline with how Netlify does it.
 
 ## Configure Title Case