implemented user-adding

backend/pkg/db/users/users.go

@@ -4,8 +4,10 @@ import (
 	"fmt"
 	"time"
 
+	"github.com/google/uuid"
 	cache "github.com/jfarleyx/go-simple-cache"
 	"github.com/johannesbuehl/golunteer/backend/pkg/db"
+	"golang.org/x/crypto/bcrypt"
 )
 
 type User struct {
@@ -17,6 +19,16 @@ type User struct {
 
 var c *cache.Cache
 
+// hashes a password
+func hashPassword(password string) ([]byte, error) {
+	return bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+}
+
+// validates a password against the password-rules
+func ValidatePassword(password string) bool {
+	return len(password) >= 12 && len(password) <= 64
+}
+
 func Get() (map[string]User, error) {
 	if users, hit := c.Get("users"); !hit {
 		refresh()
@@ -27,6 +39,37 @@ func Get() (map[string]User, error) {
 	}
 }
 
+type UserAdd struct {
+	UserName string `json:"userName" validate:"required" db:"userName"`
+	Password string `json:"password" validate:"required,min=8"`
+	Admin    bool   `json:"admin" db:"admin"`
+}
+
+func Add(user UserAdd) error {
+	// try to hash the password
+	if hash, err := hashPassword(user.Password); err != nil {
+		return err
+	} else {
+		insertUser := struct {
+			UserAdd
+			Password []byte `db:"password"`
+			TokenID  string `db:"tokenID"`
+		}{
+			UserAdd:  user,
+			Password: hash,
+			TokenID:  uuid.NewString(),
+		}
+
+		if _, err := db.DB.NamedExec("INSERT INTO USERS (name, password, admin, tokenID) VALUES (:userName, :password, :admin, :tokenID)", insertUser); err != nil {
+			return err
+		} else {
+			refresh()
+
+			return nil
+		}
+	}
+}
+
 func refresh() {
 	// get the usersRaw from the database
 	var usersRaw []User