webdav: add prefix support

config/config.go

@@ -59,6 +59,7 @@ var (
 		EnableHTTPS:     false,
 		ClientAuthType:  0,
 		TLSCipherSuites: nil,
+		Prefix:          "",
 	}
 	defaultHTTPDBinding = httpd.Binding{
 		Address:         "127.0.0.1",
@@ -675,6 +676,12 @@ func getWebDAVDBindingFromEnv(idx int) {
 		isSet = true
 	}
 
+	prefix, ok := os.LookupEnv(fmt.Sprintf("SFTPGO_WEBDAVD__BINDINGS__%v__PREFIX", idx))
+	if ok {
+		binding.Prefix = prefix
+		isSet = true
+	}
+
 	if isSet {
 		if len(globalConf.WebDAVD.Bindings) > idx {
 			globalConf.WebDAVD.Bindings[idx] = binding