From f675da905378fee408ef277bf838cfb4d45aa532 Mon Sep 17 00:00:00 2001
From: Joram Schrijver <i@joram.io>
Date: Sat, 6 Aug 2022 02:59:00 +0200
Subject: [PATCH] dlna: fix SOAP action header parsing - fixes #6354

Changes in github.com/anacrolix/dms changed upnp.ServiceURN to include a
namespace identifier. This identifier was previously hardcoded, but is
now parsed out of the URN. The old SOAP action header parsing logic was
duplicated in rclone and did not handle this field. Resulting responses
included a URN with an empty namespace identifier, breaking clients.
---
 cmd/serve/dlna/dlna.go      |  2 +-
 cmd/serve/dlna/dlna_test.go |  2 ++
 cmd/serve/dlna/dlna_util.go | 34 ----------------------------------
 3 files changed, 3 insertions(+), 35 deletions(-)

diff --git a/cmd/serve/dlna/dlna.go b/cmd/serve/dlna/dlna.go
index 0c9d2fbca..fc802226c 100644
--- a/cmd/serve/dlna/dlna.go
+++ b/cmd/serve/dlna/dlna.go
@@ -186,7 +186,7 @@ func (s *server) rootDescHandler(w http.ResponseWriter, r *http.Request) {
 // Handle a service control HTTP request.
 func (s *server) serviceControlHandler(w http.ResponseWriter, r *http.Request) {
 	soapActionString := r.Header.Get("SOAPACTION")
-	soapAction, err := parseActionHTTPHeader(soapActionString)
+	soapAction, err := upnp.ParseActionHTTPHeader(soapActionString)
 	if err != nil {
 		serveError(s, w, "Could not parse SOAPACTION header", err)
 		return
diff --git a/cmd/serve/dlna/dlna_test.go b/cmd/serve/dlna/dlna_test.go
index acc1d0ffe..8327ee054 100644
--- a/cmd/serve/dlna/dlna_test.go
+++ b/cmd/serve/dlna/dlna_test.go
@@ -119,6 +119,8 @@ func TestContentDirectoryBrowseMetadata(t *testing.T) {
 	assert.Equal(t, http.StatusOK, resp.StatusCode)
 	body, err := ioutil.ReadAll(resp.Body)
 	require.NoError(t, err)
+	// should contain an appropriate URN
+	require.Contains(t, string(body), "urn:schemas-upnp-org:service:ContentDirectory:1")
 	// expect a <container> element
 	require.Contains(t, string(body), html.EscapeString("<container "))
 	require.NotContains(t, string(body), html.EscapeString("<item "))
diff --git a/cmd/serve/dlna/dlna_util.go b/cmd/serve/dlna/dlna_util.go
index cde43d693..ad961e067 100644
--- a/cmd/serve/dlna/dlna_util.go
+++ b/cmd/serve/dlna/dlna_util.go
@@ -3,7 +3,6 @@ package dlna
 import (
 	"crypto/md5"
 	"encoding/xml"
-	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -12,9 +11,6 @@ import (
 	"net/http/httptest"
 	"net/http/httputil"
 	"os"
-	"regexp"
-	"strconv"
-	"strings"
 
 	"github.com/anacrolix/dms/soap"
 	"github.com/anacrolix/dms/upnp"
@@ -89,36 +85,6 @@ func marshalSOAPResponse(sa upnp.SoapAction, args map[string]string) []byte {
 		sa.Action, sa.ServiceURN.String(), mustMarshalXML(soapArgs)))
 }
 
-var serviceURNRegexp = regexp.MustCompile(`:service:(\w+):(\d+)$`)
-
-func parseServiceType(s string) (ret upnp.ServiceURN, err error) {
-	matches := serviceURNRegexp.FindStringSubmatch(s)
-	if matches == nil {
-		err = errors.New(s)
-		return
-	}
-	if len(matches) != 3 {
-		log.Panicf("Invalid serviceURNRegexp ?")
-	}
-	ret.Type = matches[1]
-	ret.Version, err = strconv.ParseUint(matches[2], 0, 0)
-	return
-}
-
-func parseActionHTTPHeader(s string) (ret upnp.SoapAction, err error) {
-	if s[0] != '"' || s[len(s)-1] != '"' {
-		return
-	}
-	s = s[1 : len(s)-1]
-	hashIndex := strings.LastIndex(s, "#")
-	if hashIndex == -1 {
-		return
-	}
-	ret.Action = s[hashIndex+1:]
-	ret.ServiceURN, err = parseServiceType(s[:hashIndex])
-	return
-}
-
 type loggingResponseWriter struct {
 	http.ResponseWriter
 	request   *http.Request