chore: update session and challenge repo -- using Redis for caching session and challenge verifying -- added api handler docs

internal/domain/user.go

@@ -32,6 +32,12 @@ type UserRepo interface {
 	Delete(ctx context.Context, id uuid.UUID) error
 }
 
+type ChallengeRepo interface {
+	Create(ctx context.Context, pubKey string, challenge *Challenge) error
+	GetByPubKey(ctx context.Context, pubKey string) (*Challenge, error)
+	Delete(ctx context.Context, pubKey string) error
+}
+
 type User struct {
 	ID     uuid.UUID
 	PubKey string
@@ -51,7 +57,7 @@ type User struct {
 
 // TODO: move to another file?
 type Challenge struct {
-	Message   uuid.UUID
+	Message   string
 	TimeStamp time.Time
 	ExpiresAt time.Time
 }
@@ -70,7 +76,7 @@ func (c *Challenge) Verify(address string, signedMsg string) (bool, error) {
 		return false, fmt.Errorf("decode signature: %w", err)
 	}
 
-	challengeBytes := []byte(c.Message.String())
+	challengeBytes := []byte(c.Message)
 
 	return c.VerifySignedBytes(address, challengeBytes, signature)
 }