feat: Add a way to login without standard credentials

Add functions to export/import session

Author: iTrooz

mega.go

@@ -372,6 +372,23 @@ func (m *Mega) SetClient(client *http.Client) *Mega {
 func discardLogf(format string, v ...interface{}) {
 }
 
+// Returns an opaque string representing the session
+func (m *Mega) GetSessionID() string {
+	return m.sid
+}
+
+func (m *Mega) GetMasterKey() []byte {
+	return m.k
+}
+
+// "Login" using the session ID (for API auth) and master key (for decryption). Alternative to logging in with username/password
+// This can be used to import back a session exported with GetSessionID and GetMasterKey without requiring the password again
+func (m *Mega) LoginWithKeys(sessionId string, masterKey []byte) error {
+	m.sid = sessionId
+	m.k = masterKey
+	return m.postAuthInit()
+}
+
 // SetLogger sets the logger for important messages.  By default this
 // is log.Printf.  Use nil to discard the messages.
 func (m *Mega) SetLogger(logf func(format string, v ...interface{})) *Mega {
@@ -665,9 +682,15 @@ func (m *Mega) MultiFactorLogin(email, passwd, multiFactor string) error {
 		return err
 	}
 
+	return m.postAuthInit()
+}
+
+// Finish initializing the Mega client after Login*()
+func (m *Mega) postAuthInit() error {
+
 	waitEvent := m.WaitEventsStart()
 
-	err = m.getFileSystem()
+	err := m.getFileSystem()
 	if err != nil {
 		return err
 	}

test_tools/test_real_api.go

@@ -96,6 +96,21 @@ func main() {
 		}
 	}
 
+	// Test 5: Re-create client from session
+	fmt.Println("\n=== Test 5: Re-create client from session ===")
+	m2 := mega.New()
+	err = m2.LoginWithKeys(m.GetSessionID(), m.GetMasterKey())
+	if err != nil {
+		log.Fatalf("LoginWithKeys failed: %v", err)
+	}
+
+	user, err = m2.GetUser()
+	if err != nil {
+		log.Printf("GetUser failed: %v", err)
+	} else {
+		fmt.Printf("User info retrieved in %v: Email=%s\n", time.Since(start), user.Email)
+	}
+
 	fmt.Println("\n=== All tests completed ===")
 	fmt.Println("If you saw any [DEBUG] messages mentioning 'hashcash', the feature was triggered!")
 }