Add hash-lists filtering, format code, prepare API

internal/db/model/user.go

@@ -0,0 +1,38 @@
+package model
+
+import (
+	"encoding/base64"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type DBUser struct {
+	Username       string `bson:"username" json:"username"`
+	HashedPassword string `bson:"password" json:"password"`
+
+	Password *string `bson:"-" json:"-"`
+}
+
+func (usr *DBUser) HashPassword() error {
+	if usr.Password == nil {
+		return nil
+	}
+
+	hash, err := bcrypt.GenerateFromPassword([]byte(*usr.Password), 14)
+	if err != nil {
+		return err
+	}
+
+	usr.HashedPassword = base64.StdEncoding.EncodeToString(hash)
+	return nil
+}
+
+func (usr *DBUser) CheckPassword(password string) error {
+	hash, err := base64.StdEncoding.DecodeString(usr.HashedPassword)
+	if err != nil {
+		return err
+	}
+
+	err = bcrypt.CompareHashAndPassword(hash, []byte(password))
+
+	return err
+}