added user signup feature

internal/api/mapper.go

@@ -1,9 +1,27 @@
 package api
 
-import "git.artlef.fr/PersonalLibraryManager/internal/model"
+import (
+	"git.artlef.fr/PersonalLibraryManager/internal/model"
+	"golang.org/x/crypto/bcrypt"
+)
 
 func (b bookPostCreate) toBook() model.Book {
-	return model.Book{Title: b.Title,
+	return model.Book{
+		Title:  b.Title,
 		Author: b.Author,
-		Rating: b.Rating}
+		Rating: b.Rating,
+	}
+}
+
+func (u userPostCreate) toUser() (model.User, error) {
+	user := model.User{
+		Name:     u.Username,
+		Password: "",
+	}
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(u.Password), bcrypt.DefaultCost)
+	if err != nil {
+		return user, err
+	}
+	user.Password = string(hashedPassword)
+	return user, nil
 }