add golang backend for login an d webserver

backend/login/manager.go

@@ -0,0 +1,49 @@
+package login
+
+import (
+	"backend/dbRequest"
+	"backend/utils"
+	"database/sql"
+	"fmt"
+	"os"
+)
+
+type LoginManager struct {
+	dbType string
+	dbFile string
+}
+
+func NewLoginManager(dir string) (*LoginManager, error) {
+	if dir == "" {
+		dir = "."
+	}
+
+	var typ string = "sqlite"
+	var file string = fmt.Sprintf("%s/user.db", dir)
+
+	if _, err := os.Stat(file); err != nil {
+		db, err := sql.Open(typ, file)
+		if err != nil {
+			return nil, err
+		}
+		defer db.Close()
+
+		_, err = db.Exec(dbRequest.DBCreate)
+		if err != nil {
+			return nil, err
+		}
+
+		hash, err := utils.HashPassword("tecamino@2025")
+		if err != nil {
+			return nil, err
+		}
+		_, err = db.Exec(dbRequest.DBNewUser, "admin", hash)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return &LoginManager{
+		dbType: typ,
+		dbFile: file,
+	}, nil
+}