feat: make app configurable

internal/auth/auth.go

@@ -0,0 +1,21 @@
+package auth
+
+import (
+	"tinyauth/internal/types"
+
+	"golang.org/x/crypto/bcrypt"
+)
+
+func FindUser(userList types.UserList, username string) (*types.User) {
+	for _, user := range userList.Users {
+		if user.Username == username {
+			return &user
+		}
+	}
+	return nil
+}
+
+func CheckPassword(user types.User, password string) bool {
+	hashedPasswordErr := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(password))
+	return hashedPasswordErr == nil
+}