Add root path to static middleware

changelog/unreleased/static-root-path.md

@@ -0,0 +1,7 @@
+Change: Add root path to static middleware
+
+Currently the `Static` middleware always serves from the root path, but all our
+HTTP handlers accept a custom root path which also got to be applied to the
+static file handling.
+
+https://github.com/owncloud/ocis-pkg/issues/9

middleware/static.go

@@ -2,13 +2,14 @@ package middleware
 
 import (
 	"net/http"
+	"path"
 	"strings"
 )
 
 // Static is a middleware that serves static assets.
-func Static(fs http.FileSystem) func(http.Handler) http.Handler {
+func Static(root string, fs http.FileSystem) func(http.Handler) http.Handler {
 	static := http.StripPrefix(
-		"/",
+		root+"/",
 		http.FileServer(
 			fs,
 		),
@@ -16,7 +17,7 @@ func Static(fs http.FileSystem) func(http.Handler) http.Handler {
 
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			if strings.HasPrefix(r.URL.Path, "/api") {
+			if strings.HasPrefix(r.URL.Path, path.Join(root, "api")) {
 				next.ServeHTTP(w, r)
 			} else {
 				if strings.HasSuffix(r.URL.Path, "/") {