Add a flag to unescape variable values

mux.go

@@ -84,6 +84,8 @@ type routeConf struct {
 	// will not redirect
 	skipClean bool
 
+	unescapeVars bool
+
 	// Manager for the variables from host and path.
 	regexp routeRegexpGroup
 
@@ -260,6 +262,14 @@ func (r *Router) SkipClean(value bool) *Router {
 	return r
 }
 
+// UnescapeVars tells the router to escape the route variables before invoking
+// the handler. This is useful when used together with UseEncodedPath to avoid
+// un-escaping the variable values in the handler.
+func (r *Router) UnescapeVars(value bool) *Router {
+	r.unescapeVars = value
+	return r
+}
+
 // UseEncodedPath tells the router to match the encoded original path
 // to the routes.
 // For eg. "/path/foo%2Fbar/to" will match the path "/path/{var}/to".

mux_test.go

@@ -1540,13 +1540,10 @@ func TestStrictSlash(t *testing.T) {
 }
 
 func TestUseEncodedPath(t *testing.T) {
-	r := NewRouter()
-	r.UseEncodedPath()
-
 	tests := []routeTest{
 		{
 			title:        "Router with useEncodedPath, URL with encoded slash does match",
-			route:        r.NewRoute().Path("/v1/{v1}/v2"),
+			route:        NewRouter().UseEncodedPath().NewRoute().Path("/v1/{v1}/v2"),
 			request:      newRequest("GET", "http://localhost/v1/1%2F2/v2"),
 			vars:         map[string]string{"v1": "1%2F2"},
 			host:         "",
@@ -1554,9 +1551,19 @@ func TestUseEncodedPath(t *testing.T) {
 			pathTemplate: `/v1/{v1}/v2`,
 			shouldMatch:  true,
 		},
+		{
+			title:        "Router with useEncodedPath, URL with encoded slash does match, variables decoded",
+			route:        NewRouter().UseEncodedPath().UnescapeVars(true).NewRoute().Path("/v1/{v1}/v2"),
+			request:      newRequest("GET", "http://localhost/v1/1%2F2/v2"),
+			vars:         map[string]string{"v1": "1/2"},
+			host:         "",
+			path:         "/v1/1%2F2/v2",
+			pathTemplate: `/v1/{v1}/v2`,
+			shouldMatch:  true,
+		},
 		{
 			title:        "Router with useEncodedPath, URL with encoded slash doesn't match",
-			route:        r.NewRoute().Path("/v1/1/2/v2"),
+			route:        NewRouter().UseEncodedPath().NewRoute().Path("/v1/1/2/v2"),
 			request:      newRequest("GET", "http://localhost/v1/1%2F2/v2"),
 			vars:         map[string]string{"v1": "1%2F2"},
 			host:         "",

regexp.go

@@ -17,6 +17,7 @@ import (
 type routeRegexpOptions struct {
 	strictSlash    bool
 	useEncodedPath bool
+	unescapeVars   bool
 }
 
 type regexpType int
@@ -204,7 +205,11 @@ func (r *routeRegexp) url(values map[string]string) (string, error) {
 		if r.regexpType == regexpTypeQuery {
 			value = url.QueryEscape(value)
 		}
-		urlValues[k] = value
+		if r.options.unescapeVars {
+			urlValues[k] = url.PathEscape(value)
+		} else {
+			urlValues[k] = value
+		}
 	}
 	rv := fmt.Sprintf(r.reverse, urlValues...)
 	if !r.regexp.MatchString(rv) {
@@ -345,6 +350,9 @@ func (v routeRegexpGroup) setMatch(req *http.Request, m *RouteMatch, r *Route) {
 		matches := v.path.regexp.FindStringSubmatchIndex(path)
 		if len(matches) > 0 {
 			extractVars(path, matches, v.path.varsN, m.Vars)
+			if r.unescapeVars {
+				unescapeVars(m.Vars)
+			}
 			// Check if we should redirect.
 			if v.path.options.strictSlash {
 				p1 := strings.HasSuffix(path, "/")
@@ -386,3 +394,13 @@ func extractVars(input string, matches []int, names []string, output map[string]
 		output[name] = input[matches[2*i+2]:matches[2*i+3]]
 	}
 }
+
+func unescapeVars(vars map[string]string) {
+	for k, v := range vars {
+		if decoded, err := url.PathUnescape(v); err != nil {
+			vars[k] = v
+		} else {
+			vars[k] = decoded
+		}
+	}
+}

route.go

@@ -186,6 +186,7 @@ func (r *Route) addRegexpMatcher(tpl string, typ regexpType) error {
 	rr, err := newRouteRegexp(tpl, typ, routeRegexpOptions{
 		strictSlash:    r.strictSlash,
 		useEncodedPath: r.useEncodedPath,
+		unescapeVars:   r.unescapeVars,
 	})
 	if err != nil {
 		return err