Added database support and update login to utilize db

db/users.go

@@ -0,0 +1,62 @@
+package db
+
+import (
+	"database/sql"
+	"fmt"
+
+	"github.com/pkg/errors"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type User struct {
+	ID            int
+	Username      string
+	Password_hash string
+	Created_at    int64
+}
+
+func (user *User) SetPassword(conn *sql.DB, password string) error {
+	hashedPassword, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
+	if err != nil {
+		return errors.Wrap(err, "bcrypt.GenerateFromPassword")
+	}
+	user.Password_hash = string(hashedPassword)
+	query := `UPDATE users SET password_hash = ? WHERE id = ?`
+	result, err := conn.Exec(query, user.Password_hash, user.ID)
+	if err != nil {
+		return errors.Wrap(err, "conn.Exec")
+	}
+	fmt.Println(result)
+	return nil
+}
+
+func (user *User) CheckPassword(password string) error {
+	err := bcrypt.CompareHashAndPassword([]byte(user.Password_hash), []byte(password))
+	if err != nil {
+		return errors.Wrap(err, "bcrypt.CompareHashAndPassword")
+	}
+	return nil
+}
+
+func GetUserFromUsername(conn *sql.DB, username string) (User, error) {
+	query := `SELECT id, username, password_hash, created_at FROM users 
+	          WHERE username = ? COLLATE NOCASE`
+	rows, err := conn.Query(query, username)
+	if err != nil {
+		return User{}, errors.Wrap(err, "conn.Query")
+	}
+	defer rows.Close()
+	var user User
+	for rows.Next() {
+		err := rows.Scan(
+			&user.ID,
+			&user.Username,
+			&user.Password_hash,
+			&user.Created_at,
+		)
+		if err != nil {
+			return User{}, errors.Wrap(err, "rows.Scan")
+		}
+	}
+	return user, nil
+}