add WebDAV support

Fixes #147

webdavd/webdavd.go

@@ -0,0 +1,67 @@
+// Package webdavd implements the WebDAV protocol
+package webdavd
+
+import (
+	"path/filepath"
+
+	"github.com/drakkan/sftpgo/logger"
+	"github.com/drakkan/sftpgo/utils"
+)
+
+type ctxReqParams int
+
+const (
+	requestIDKey ctxReqParams = iota
+	requestStartKey
+)
+
+const (
+	logSender = "webdavd"
+)
+
+var (
+	server *webDavServer
+)
+
+// Configuration defines the configuration for the WevDAV server
+type Configuration struct {
+	// The port used for serving FTP requests
+	BindPort int `json:"bind_port" mapstructure:"bind_port"`
+	// The address to listen on. A blank value means listen on all available network interfaces.
+	BindAddress string `json:"bind_address" mapstructure:"bind_address"`
+	// If files containing a certificate and matching private key for the server are provided the server will expect
+	// HTTPS connections.
+	// Certificate and key files can be reloaded on demand sending a "SIGHUP" signal on Unix based systems and a
+	// "paramchange" request to the running service on Windows.
+	CertificateFile    string `json:"certificate_file" mapstructure:"certificate_file"`
+	CertificateKeyFile string `json:"certificate_key_file" mapstructure:"certificate_key_file"`
+}
+
+// Initialize configures and starts the WebDav server
+func (c *Configuration) Initialize(configDir string) error {
+	var err error
+	logger.Debug(logSender, "", "initializing WevDav server with config %+v", *c)
+	server, err = newServer(c, configDir)
+	if err != nil {
+		return err
+	}
+	return server.listenAndServe()
+}
+
+// ReloadTLSCertificate reloads the TLS certificate and key from the configured paths
+func ReloadTLSCertificate() error {
+	if server != nil && server.certMgr != nil {
+		return server.certMgr.LoadCertificate(logSender)
+	}
+	return nil
+}
+
+func getConfigPath(name, configDir string) string {
+	if !utils.IsFileInputValid(name) {
+		return ""
+	}
+	if len(name) > 0 && !filepath.IsAbs(name) {
+		return filepath.Join(configDir, name)
+	}
+	return name
+}