feat: mail service

authsession/internal/adapters/redis/challengestore/store.go

@@ -24,6 +24,8 @@ import (
 
 const expirationGracePeriod = 5 * time.Minute
 
+const defaultPreferredLanguage = "en"
+
 // Config configures one Redis-backed challenge store instance.
 type Config struct {
 	// Addr is the Redis network address in host:port form.
@@ -59,6 +61,7 @@ type redisRecord struct {
 	ChallengeID              string                  `json:"challenge_id"`
 	Email                    string                  `json:"email"`
 	CodeHashBase64           string                  `json:"code_hash_base64"`
+	PreferredLanguage        string                  `json:"preferred_language,omitempty"`
 	Status                   challenge.Status        `json:"status"`
 	DeliveryState            challenge.DeliveryState `json:"delivery_state"`
 	CreatedAt                string                  `json:"created_at"`
@@ -291,6 +294,7 @@ func redisRecordFromChallenge(record challenge.Challenge) (redisRecord, error) {
 		ChallengeID:         record.ID.String(),
 		Email:               record.Email.String(),
 		CodeHashBase64:      base64.StdEncoding.EncodeToString(record.CodeHash),
+		PreferredLanguage:   record.PreferredLanguage,
 		Status:              record.Status,
 		DeliveryState:       record.DeliveryState,
 		CreatedAt:           formatTimestamp(record.CreatedAt),
@@ -354,13 +358,14 @@ func challengeFromRedisRecord(stored redisRecord) (challenge.Challenge, error) {
 	}
 
 	record := challenge.Challenge{
-		ID:            common.ChallengeID(stored.ChallengeID),
-		Email:         common.Email(stored.Email),
-		CodeHash:      codeHash,
-		Status:        stored.Status,
-		DeliveryState: stored.DeliveryState,
-		CreatedAt:     createdAt,
-		ExpiresAt:     expiresAt,
+		ID:                common.ChallengeID(stored.ChallengeID),
+		Email:             common.Email(stored.Email),
+		CodeHash:          codeHash,
+		PreferredLanguage: normalizeStoredPreferredLanguage(stored.PreferredLanguage),
+		Status:            stored.Status,
+		DeliveryState:     stored.DeliveryState,
+		CreatedAt:         createdAt,
+		ExpiresAt:         expiresAt,
 		Attempts: challenge.AttemptCounters{
 			Send:    stored.SendAttemptCount,
 			Confirm: stored.ConfirmAttemptCount,
@@ -459,6 +464,15 @@ func formatOptionalTimestamp(value *time.Time) *string {
 	return &formatted
 }
 
+func normalizeStoredPreferredLanguage(value string) string {
+	preferredLanguage := strings.TrimSpace(value)
+	if preferredLanguage == "" {
+		return defaultPreferredLanguage
+	}
+
+	return preferredLanguage
+}
+
 func redisTTL(expiresAt time.Time) time.Duration {
 	ttl := time.Until(expiresAt.UTC())
 	if ttl < 0 {