From bf19d5d542b23109e1b895b0650ccd174441ec1b Mon Sep 17 00:00:00 2001
From: tolelom <98kimsungmin@naver.com>
Date: Mon, 13 Apr 2026 03:00:34 +0900
Subject: [PATCH] =?UTF-8?q?refactor:=20apiRetryCount=C2=B7maxJSONBodySize?=
 =?UTF-8?q?=20=EC=83=81=EC=88=98=ED=99=94,=20bytes.NewReader=20=EC=88=98?=
 =?UTF-8?q?=EC=A0=95?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 protocol.go | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/protocol.go b/protocol.go
index a6d6c5c..5bcb906 100644
--- a/protocol.go
+++ b/protocol.go
@@ -1,6 +1,7 @@
 package main
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -21,6 +22,9 @@ import (
 const (
 	protocolName = "a301"
 	gameExeName  = "A301.exe"
+
+	apiRetryCount   = 3       // fetchServerInfo, redeemTicket 재시도 횟수
+	maxJSONBodySize = 1 << 20 // JSON 응답 바디 최대 1MB
 )
 
 // serverInfoURL, redeemTicketURL은 빌드 시 -ldflags로 오버라이드 가능.
@@ -183,7 +187,7 @@ func retryWithBackoff(maxRetries int, fn func() error) error {
 // fetchServerInfo 서버에서 게임/런처 다운로드 정보를 조회한다 (3회 재시도).
 func fetchServerInfo() (*downloadInfo, error) {
 	var info *downloadInfo
-	err := retryWithBackoff(3, func() error {
+	err := retryWithBackoff(apiRetryCount, func() error {
 		resp, err := apiClient.Get(serverInfoURL)
 		if err != nil {
 			return fmt.Errorf("서버 연결 실패: %w", err)
@@ -198,7 +202,7 @@ func fetchServerInfo() (*downloadInfo, error) {
 		}
 
 		var result downloadInfo
-		if err := json.NewDecoder(io.LimitReader(resp.Body, 1<<20)).Decode(&result); err != nil {
+		if err := json.NewDecoder(io.LimitReader(resp.Body, maxJSONBodySize)).Decode(&result); err != nil {
 			return fmt.Errorf("서버 응답 파싱 실패: %w", err)
 		}
 		info = &result
@@ -213,13 +217,13 @@ func fetchServerInfo() (*downloadInfo, error) {
 // redeemTicket 일회용 티켓을 서버에 보내 JWT 액세스 토큰으로 교환한다 (3회 재시도).
 func redeemTicket(ticket string) (string, error) {
 	var token string
-	err := retryWithBackoff(3, func() error {
+	err := retryWithBackoff(apiRetryCount, func() error {
 		payload, err := json.Marshal(map[string]string{"ticket": ticket})
 		if err != nil {
 			return fmt.Errorf("요청 데이터 생성 실패: %w", err)
 		}
 
-		resp, err := apiClient.Post(redeemTicketURL, "application/json", strings.NewReader(string(payload)))
+		resp, err := apiClient.Post(redeemTicketURL, "application/json", bytes.NewReader(payload))
 		if err != nil {
 			return fmt.Errorf("서버에 연결할 수 없습니다: %w", err)
 		}
@@ -235,7 +239,7 @@ func redeemTicket(ticket string) (string, error) {
 		var result struct {
 			Token string `json:"token"`
 		}
-		if err := json.NewDecoder(io.LimitReader(resp.Body, 1<<20)).Decode(&result); err != nil {
+		if err := json.NewDecoder(io.LimitReader(resp.Body, maxJSONBodySize)).Decode(&result); err != nil {
 			return fmt.Errorf("서버 응답을 처리할 수 없습니다: %w", err)
 		}
 		if result.Token == "" {