Added bio to User and reworked file structure for user interaction

db/user.go

@@ -0,0 +1,50 @@
+package db
+
+import (
+	"database/sql"
+
+	"github.com/pkg/errors"
+	"golang.org/x/crypto/bcrypt"
+)
+
+type User struct {
+	ID            int    // Integer ID (index primary key)
+	Username      string // Username (unique)
+	Password_hash string // Bcrypt password hash
+	Created_at    int64  // Epoch timestamp when the user was added to the database
+	Bio           string // Short byline set by the user
+}
+
+// Uses bcrypt to set the users Password_hash from the given password
+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 = ?`
+	_, err = conn.Exec(query, user.Password_hash, user.ID)
+	if err != nil {
+		return errors.Wrap(err, "conn.Exec")
+	}
+	return nil
+}
+
+// Uses bcrypt to check if the given password matches the users Password_hash
+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
+}
+
+// Change the user's username
+func (user *User) ChangeUsername(conn *sql.DB, newUsername string) error {
+	query := `UPDATE users SET username = ? WHERE id = ?`
+	_, err := conn.Exec(query, newUsername, user.ID)
+	if err != nil {
+		return errors.Wrap(err, "conn.Exec")
+	}
+	return nil
+}