refactor: put logic in discoverBootstrapURLs

- if user gave us URL, use it
- else if user gave us lease file, use it
- else try to fecth from network manager via dbus

Signed-off-by: Boris Glimcher <[email protected]>

sztp-agent/pkg/secureagent/daemon.go

@@ -56,11 +56,9 @@ func (a *Agent) RunCommandDaemon() error {
 
 func (a *Agent) performBootstrapSequence() error {
 	var err error
-	if a.GetBootstrapURL() == "" {
-		err = a.discoverBootstrapURLs()
-		if err != nil {
-			return err
-		}
+	err = a.discoverBootstrapURLs()
+	if err != nil {
+		return err
 	}
 	err = a.doRequestBootstrapServerOnboardingInfo()
 	if err != nil {
@@ -91,6 +89,32 @@ func (a *Agent) performBootstrapSequence() error {
 }
 
 func (a *Agent) discoverBootstrapURLs() error {
+	log.Println("[INFO] Discovering the Bootstrap URL")
+	// TODO: rename to a.InputBootstrapURL
+	if a.BootstrapURL != "" {
+		log.Println("[INFO] User gave us the Bootstrap URL: " + a.BootstrapURL)
+		a.SetBootstrapURL(a.BootstrapURL)
+		log.Println("[INFO] Bootstrap URL retrieved successfully: " + a.GetBootstrapURL())
+		return nil
+	}
+	if a.DhcpLeaseFile != "" {
+		log.Println("[INFO] User gave us the DHCP Lease File: " + a.DhcpLeaseFile)
+		urls, err := getBootstrapURLsViaLeaseFile(a.DhcpLeaseFile, SZTP_REDIRECT_URL)
+		if err != nil {
+			return err
+		}
+		a.SetBootstrapURL(urls[0])
+		log.Println("[INFO] Bootstrap URL retrieved successfully: " + a.GetBootstrapURL())
+		return nil
+	}
+	log.Println("[INFO] User gave us nothing, discover the Bootstrap URL from Netwrok Manager via dbus")
+	// TODO: fetch the Bootstrap URL from Netwrok Manager via dbus in the future
+	log.Println("[INFO] Bootstrap URL retrieved successfully: " + a.GetBootstrapURL())
+	return nil
+}
+
+// TODO: move this function into DHCP package folder
+func (a *Agent) getBootstrapURLsViaLeaseFile() error {
 	log.Println("[INFO] Get the Bootstrap URL from DHCP client")
 	var line string
 	if _, err := os.Stat(a.DhcpLeaseFile); err == nil {