From e769f67699ed7e5cbc79a61632940d3424777726 Mon Sep 17 00:00:00 2001
From: shaw <shaw-wei@foxmail.com>
Date: Fri, 19 Dec 2025 11:21:58 +0800
Subject: [PATCH] =?UTF-8?q?fix(setup):=20=E6=94=AF=E6=8C=81=E4=BB=8E?=
 =?UTF-8?q?=E9=85=8D=E7=BD=AE=E6=96=87=E4=BB=B6=E8=AF=BB=E5=8F=96=20Setup?=
 =?UTF-8?q?=20Wizard=20=E7=9B=91=E5=90=AC=E5=9C=B0=E5=9D=80?=
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Setup Wizard 之前硬编码使用 8080 端口，现在支持从 config.yaml 或
环境变量 (SERVER_HOST, SERVER_PORT) 读取监听地址，方便用户在端口
被占用时使用其他地址启动初始化向导。
---
 backend/cmd/server/main.go        |  7 +++++--
 backend/internal/config/config.go | 26 ++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/backend/cmd/server/main.go b/backend/cmd/server/main.go
index ae000119..ac10b322 100644
--- a/backend/cmd/server/main.go
+++ b/backend/cmd/server/main.go
@@ -15,6 +15,7 @@ import (
 	"syscall"
 	"time"
 
+	"sub2api/internal/config"
 	"sub2api/internal/handler"
 	"sub2api/internal/middleware"
 	"sub2api/internal/setup"
@@ -94,8 +95,10 @@ func runSetupServer() {
 		r.Use(web.ServeEmbeddedFrontend())
 	}
 
-	addr := ":8080"
-	log.Printf("Setup wizard available at http://localhost%s", addr)
+	// Get server address from config.yaml or environment variables (SERVER_HOST, SERVER_PORT)
+	// This allows users to run setup on a different address if needed
+	addr := config.GetServerAddress()
+	log.Printf("Setup wizard available at http://%s", addr)
 	log.Println("Complete the setup wizard to configure Sub2API")
 
 	if err := r.Run(addr); err != nil {
diff --git a/backend/internal/config/config.go b/backend/internal/config/config.go
index b4120201..d8836e92 100644
--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@@ -203,3 +203,29 @@ func (c *Config) Validate() error {
 	}
 	return nil
 }
+
+// GetServerAddress returns the server address (host:port) from config file or environment variable.
+// This is a lightweight function that can be used before full config validation,
+// such as during setup wizard startup.
+// Priority: config.yaml > environment variables > defaults
+func GetServerAddress() string {
+	v := viper.New()
+	v.SetConfigName("config")
+	v.SetConfigType("yaml")
+	v.AddConfigPath(".")
+	v.AddConfigPath("./config")
+	v.AddConfigPath("/etc/sub2api")
+
+	// Support SERVER_HOST and SERVER_PORT environment variables
+	v.AutomaticEnv()
+	v.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+	v.SetDefault("server.host", "0.0.0.0")
+	v.SetDefault("server.port", 8080)
+
+	// Try to read config file (ignore errors if not found)
+	_ = v.ReadInConfig()
+
+	host := v.GetString("server.host")
+	port := v.GetInt("server.port")
+	return fmt.Sprintf("%s:%d", host, port)
+}