fix: fix static assets url generation (#965)

http/share.go

@@ -4,6 +4,7 @@ import (
 	"crypto/rand"
 	"encoding/base64"
 	"net/http"
+	"path"
 	"strconv"
 	"strings"
 	"time"
@@ -56,7 +57,7 @@ var sharePostHandler = withPermShare(func(w http.ResponseWriter, r *http.Request
 		var err error
 		s, err = d.store.Share.GetPermanent(r.URL.Path, d.user.ID)
 		if err == nil {
-			w.Write([]byte(d.server.BaseURL + "/share/" + s.Hash))
+			w.Write([]byte(path.Join(d.server.BaseURL, "/share/", s.Hash)))
 			return 0, nil
 		}
 	}

http/static.go

@@ -5,6 +5,7 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 	"text/template"
@@ -19,8 +20,6 @@ import (
 func handleWithStaticData(w http.ResponseWriter, r *http.Request, d *data, box *rice.Box, file, contentType string) (int, error) {
 	w.Header().Set("Content-Type", contentType)
 
-	staticURL := strings.TrimPrefix(d.server.BaseURL+"/static", "/")
-
 	auther, err := d.store.Auth.Get(d.settings.AuthMethod)
 	if err != nil {
 		return http.StatusInternalServerError, err
@@ -31,7 +30,7 @@ func handleWithStaticData(w http.ResponseWriter, r *http.Request, d *data, box *
 		"DisableExternal": d.settings.Branding.DisableExternal,
 		"BaseURL":         d.server.BaseURL,
 		"Version":         version.Version,
-		"StaticURL":       staticURL,
+		"StaticURL":       path.Join(d.server.BaseURL, "/static"),
 		"Signup":          d.settings.Signup,
 		"NoAuth":          d.settings.AuthMethod == auth.MethodNoAuth,
 		"AuthMethod":      d.settings.AuthMethod,

http/utils.go

@@ -43,7 +43,7 @@ func errToStatus(err error) int {
 // This is an addaptation if http.StripPrefix in which we don't
 // return 404 if the page doesn't have the needed prefix.
 func stripPrefix(prefix string, h http.Handler) http.Handler {
-	if prefix == "" {
+	if prefix == "" || prefix == "/" {
 		return h
 	}