feat: user service

user/internal/adapters/local/id_generator.go

@@ -0,0 +1,105 @@
+package local
+
+import (
+	"crypto/rand"
+	"encoding/base32"
+	"fmt"
+	"strings"
+
+	"galaxy/user/internal/domain/common"
+	"galaxy/user/internal/domain/entitlement"
+	"galaxy/user/internal/domain/policy"
+)
+
+var base32NoPadding = base32.StdEncoding.WithPadding(base32.NoPadding)
+
+// IDGenerator creates opaque stable user identifiers and generated initial
+// race names.
+type IDGenerator struct{}
+
+// NewUserID returns one newly generated opaque user identifier.
+func (IDGenerator) NewUserID() (common.UserID, error) {
+	token, err := randomToken(10)
+	if err != nil {
+		return "", fmt.Errorf("generate user id: %w", err)
+	}
+
+	userID := common.UserID("user-" + token)
+	if err := userID.Validate(); err != nil {
+		return "", fmt.Errorf("generate user id: %w", err)
+	}
+
+	return userID, nil
+}
+
+// NewInitialRaceName returns one generated race name in the `player-<shortid>`
+// form.
+func (IDGenerator) NewInitialRaceName() (common.RaceName, error) {
+	token, err := randomToken(5)
+	if err != nil {
+		return "", fmt.Errorf("generate initial race name: %w", err)
+	}
+
+	raceName := common.RaceName("player-" + token)
+	if err := raceName.Validate(); err != nil {
+		return "", fmt.Errorf("generate initial race name: %w", err)
+	}
+
+	return raceName, nil
+}
+
+// NewEntitlementRecordID returns one generated entitlement history record
+// identifier.
+func (IDGenerator) NewEntitlementRecordID() (entitlement.EntitlementRecordID, error) {
+	token, err := randomToken(10)
+	if err != nil {
+		return "", fmt.Errorf("generate entitlement record id: %w", err)
+	}
+
+	recordID := entitlement.EntitlementRecordID("entitlement-" + token)
+	if err := recordID.Validate(); err != nil {
+		return "", fmt.Errorf("generate entitlement record id: %w", err)
+	}
+
+	return recordID, nil
+}
+
+// NewSanctionRecordID returns one generated sanction history record
+// identifier.
+func (IDGenerator) NewSanctionRecordID() (policy.SanctionRecordID, error) {
+	token, err := randomToken(10)
+	if err != nil {
+		return "", fmt.Errorf("generate sanction record id: %w", err)
+	}
+
+	recordID := policy.SanctionRecordID("sanction-" + token)
+	if err := recordID.Validate(); err != nil {
+		return "", fmt.Errorf("generate sanction record id: %w", err)
+	}
+
+	return recordID, nil
+}
+
+// NewLimitRecordID returns one generated limit history record identifier.
+func (IDGenerator) NewLimitRecordID() (policy.LimitRecordID, error) {
+	token, err := randomToken(10)
+	if err != nil {
+		return "", fmt.Errorf("generate limit record id: %w", err)
+	}
+
+	recordID := policy.LimitRecordID("limit-" + token)
+	if err := recordID.Validate(); err != nil {
+		return "", fmt.Errorf("generate limit record id: %w", err)
+	}
+
+	return recordID, nil
+}
+
+func randomToken(size int) (string, error) {
+	buffer := make([]byte, size)
+	if _, err := rand.Read(buffer); err != nil {
+		return "", err
+	}
+
+	return strings.ToLower(base32NoPadding.EncodeToString(buffer)), nil
+}