From 897851a2ebb57808447475f427899f9bff8ee118 Mon Sep 17 00:00:00 2001
From: Sean Du <do4suki@gmail.com>
Date: Mon, 1 Jun 2026 19:22:22 +0800
Subject: [PATCH] Add support for package size override

Signed-off-by: Sean Du <do4suki@gmail.com>
---
 config/config.go                    | 13 ++++++---
 doc/4.md                            | 19 +++++++++++++
 internal/handler/download/update.go | 41 +++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+), 3 deletions(-)

diff --git a/config/config.go b/config/config.go
index 3769003..4d187ca 100644
--- a/config/config.go
+++ b/config/config.go
@@ -27,6 +27,7 @@ type Settings struct {
 	CdnServer            string               `json:"cdn_server"`
 	BackupCdnServer      string               `json:"backup_cdn_server"`
 	OverrideServerConfig OverrideServerConfig `json:"override_server_config"`
+	OverrideFileSize     []OverrideFileSize   `json:"override_file_size"`
 }
 
 type OverrideServerConfig struct {
@@ -40,6 +41,11 @@ type OverrideFileSource struct {
 	Size int    `json:"size"`
 }
 
+type OverrideFileSize struct {
+	TargetOs string `json:"target_os"`
+	FileName string `json:"file_name"`
+}
+
 func InitConfig() {
 	Conf = Load("./config.json")
 }
@@ -48,9 +54,10 @@ func DefaultConfigs() *AppConfigs {
 	return &AppConfigs{
 		AppName: "honoka-chan",
 		Settings: Settings{
-			ListenPort:      "8080",
-			CdnServer:       "http://127.0.0.1:8080/static",
-			BackupCdnServer: "",
+			ListenPort:       "8080",
+			CdnServer:        "http://127.0.0.1:8080/static",
+			BackupCdnServer:  "",
+			OverrideFileSize: []OverrideFileSize{},
 			OverrideServerConfig: OverrideServerConfig{
 				Enable: false,
 				Android: OverrideFileSource{
diff --git a/doc/4.md b/doc/4.md
index 9f8a964..8696738 100644
--- a/doc/4.md
+++ b/doc/4.md
@@ -30,6 +30,25 @@
 
 `size` 可选，填 `0` 会在服务端请求该 URL 自动探测文件大小；如果你已知大小，建议直接填写可减少请求开销。
 
+如果第三方 CDN 上某些包实际文件大小与数据库 `pkg_size` 不一致（例如 `99_0_113.zip`），可以使用 `settings.override_file_size` 覆盖返回给客户端的大小（不改数据库）：
+
+```json
+{
+	"settings": {
+		"override_file_size": [
+			{
+				"target_os": "Android",
+				"file_name": "99_0_113.zip"
+			}
+		]
+	}
+}
+```
+
+`target_os` 可留空，留空表示对所有系统生效。
+
+命中后会按该文件最终下发的 `url` 自动探测大小，并覆盖 `size` 返回值。
+
 登录方式为 `手机号密码登录`，都可以随便输。第一次使用的手机号会自动生成账号并记住登录的密码，以及后续的游戏内设置都会保存。
 
 ### SIF 测试
diff --git a/internal/handler/download/update.go b/internal/handler/download/update.go
index 206349c..b514e5f 100644
--- a/internal/handler/download/update.go
+++ b/internal/handler/download/update.go
@@ -82,6 +82,8 @@ func update(ctx *gin.Context) {
 				Version: config.PackageVersion,
 			})
 		}
+
+		applyOverrideFileSize(downloadReq.TargetOs, pkgList)
 	}
 
 	ss.Respond(downloadschema.UpdateResp{
@@ -128,6 +130,45 @@ func getRemoteFileSize(url string) int {
 	return int(dataLen)
 }
 
+func applyOverrideFileSize(targetOs string, pkgList []downloadschema.UpdateData) {
+	urlSizeCache := map[string]int{}
+
+	for i := range pkgList {
+		fileName := getFileNameFromURL(pkgList[i].URL)
+		if fileName == "" {
+			continue
+		}
+
+		for _, override := range config.Conf.Settings.OverrideFileSize {
+			overrideOs := strings.TrimSpace(override.TargetOs)
+			if overrideOs != "" && !strings.EqualFold(overrideOs, strings.TrimSpace(targetOs)) {
+				continue
+			}
+			if strings.EqualFold(strings.TrimSpace(override.FileName), fileName) {
+				size, ok := urlSizeCache[pkgList[i].URL]
+				if !ok {
+					size = getRemoteFileSize(pkgList[i].URL)
+					urlSizeCache[pkgList[i].URL] = size
+				}
+
+				if size > 0 {
+					pkgList[i].Size = size
+				}
+				break
+			}
+		}
+	}
+}
+
+func getFileNameFromURL(rawURL string) string {
+	urlNoQuery := strings.Split(rawURL, "?")[0]
+	parts := strings.Split(urlNoQuery, "/")
+	if len(parts) == 0 {
+		return ""
+	}
+	return strings.TrimSpace(parts[len(parts)-1])
+}
+
 func init() {
 	router.AddHandler("main.php", "POST", "/download/update", middleware.Common, update)
 }