Refactor into server object to handle registered accounts

pkg/server/accounts.go

@@ -0,0 +1,47 @@
+package server
+
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+)
+
+// Account represents a registered user
+type Account struct {
+	// Name simply describes the account and must be unique
+	Name string
+
+	// id represents a unique ID per account and is set one registered
+	id uuid.UUID
+}
+
+// Accountant manages a set of accounts
+type Accountant struct {
+	accounts []Account
+}
+
+// NewAccountant creates a new accountant
+func NewAccountant() *Accountant {
+	return &Accountant{}
+}
+
+// RegisterAccount adds an account to the set of internal accounts
+func (a *Accountant) RegisterAccount(acc Account) (Account, error) {
+
+	// Set the account ID to a new UUID
+	acc.id = uuid.New()
+
+	// Verify this acount isn't already registered
+	for _, a := range a.accounts {
+		if a.Name == acc.Name {
+			return Account{}, fmt.Errorf("Account name already registered")
+		} else if a.id == acc.id {
+			return Account{}, fmt.Errorf("Account ID already registered")
+		}
+	}
+
+	// Simply add the account to the list
+	a.accounts = append(a.accounts, acc)
+
+	return acc, nil
+}