fix: mount config directory instead of file for Docker Compose

- Add CONFIG_PATH env support to avoid Docker creating config.json as a directory
- Config Save() now auto-creates parent directories
- Update docker-compose.yml to mount ./config:/app/config
- Update README deployment docs accordingly

Dockerfile

@@ -16,7 +16,7 @@ RUN apk --no-cache add ca-certificates
 WORKDIR /app
 
 # 创建必要目录
-RUN mkdir -p web/static cache
+RUN mkdir -p web/static cache config
 
 # 复制编译后的二进制文件和静态资源
 COPY --from=builder /app/mirror-proxy .

README.md

@@ -49,10 +49,11 @@ services:
     ports:
       - "8080:8080"
     volumes:
-      - ./config.json:/app/config.json
+      - ./config:/app/config
       - ./cache:/app/cache
     environment:
       - TZ=Asia/Shanghai
+      - CONFIG_PATH=/app/config/config.json
 EOF
 ```
 
@@ -62,7 +63,7 @@ EOF
 docker-compose up -d
 ```
 
-首次启动会自动创建 `config.json`（默认账号 `admin` / `admin123`）。
+首次启动会自动在 `./config/` 目录下创建 `config.json`（默认账号 `admin` / `admin123`），无需手动提前创建配置文件。
 
 **3. 常用命令**
 
@@ -96,12 +97,16 @@ docker-compose pull && docker-compose up -d
 ### 使用 Docker 直接运行
 
 ```bash
+# 创建配置目录
+mkdir -p config cache
+
 # 拉取并运行（首次运行自动生成 config.json）
 docker run -d \
   --name mirror-proxy \
   -p 8080:8080 \
-  -v $(pwd)/config.json:/app/config.json \
+  -v $(pwd)/config:/app/config \
   -v $(pwd)/cache:/app/cache \
+  -e CONFIG_PATH=/app/config/config.json \
   --restart unless-stopped \
   ghcr.io/arkylin/mirror-proxy:latest
 ```

cmd/main.go

@@ -15,7 +15,11 @@ import (
 )
 
 func main() {
-	cfg, err := config.Load("config.json")
+	configPath := os.Getenv("CONFIG_PATH")
+	if configPath == "" {
+		configPath = "config.json"
+	}
+	cfg, err := config.Load(configPath)
 	if err != nil {
 		log.Fatalf("Failed to load config: %v", err)
 	}

docker-compose.yml

@@ -1,14 +1,13 @@
 services:
   mirror-proxy:
-    # 使用 GHCR 预构建镜像（推荐）
+    image: ghcr.io/arkylin/mirror-proxy:latest
-    # image: ghcr.io/arkylin/mirror-proxy:latest
-    build: .
     container_name: mirror-proxy
     restart: unless-stopped
     ports:
       - "8080:8080"
     volumes:
-      - ./config.json:/app/config.json
+      - ./config:/app/config
       - ./cache:/app/cache
     environment:
       - TZ=Asia/Shanghai
+      - CONFIG_PATH=/app/config/config.json

internal/admin/handlers.go

@@ -63,7 +63,7 @@ func (h *Handler) CreateLink(w http.ResponseWriter, r *http.Request) {
 	}
 
 	h.cfg.SetLink(link)
-	if err := h.cfg.Save("config.json"); err != nil {
+	if err := h.cfg.Save(config.GetConfigFilePath()); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
@@ -112,7 +112,7 @@ func (h *Handler) UpdateLink(w http.ResponseWriter, r *http.Request) {
 	}
 
 	h.cfg.SetLink(link)
-	if err := h.cfg.Save("config.json"); err != nil {
+	if err := h.cfg.Save(config.GetConfigFilePath()); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
@@ -132,7 +132,7 @@ func (h *Handler) DeleteLink(w http.ResponseWriter, r *http.Request) {
 	}
 
 	h.cfg.DeleteLink(id)
-	if err := h.cfg.Save("config.json"); err != nil {
+	if err := h.cfg.Save(config.GetConfigFilePath()); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
@@ -152,7 +152,7 @@ func (h *Handler) RegenerateToken(w http.ResponseWriter, r *http.Request) {
 
 	link.Token = auth.GenerateToken()
 	h.cfg.SetLink(link)
-	if err := h.cfg.Save("config.json"); err != nil {
+	if err := h.cfg.Save(config.GetConfigFilePath()); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
@@ -221,7 +221,7 @@ func (h *Handler) UpdateConfig(w http.ResponseWriter, r *http.Request) {
 		h.cfg.AdminPass = req.AdminPass
 	}
 
-	if err := h.cfg.Save("config.json"); err != nil {
+	if err := h.cfg.Save(config.GetConfigFilePath()); err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}

internal/config/config.go

@@ -3,9 +3,20 @@ package config
 import (
 	"encoding/json"
 	"os"
+	"path/filepath"
 	"sync"
 )
 
+var configFilePath string = "config.json"
+
+func SetConfigFilePath(path string) {
+	configFilePath = path
+}
+
+func GetConfigFilePath() string {
+	return configFilePath
+}
+
 type Config struct {
 	ListenAddr       string            `json:"listen_addr"`
 	AdminPath        string            `json:"admin_path"`
@@ -38,6 +49,7 @@ var (
 )
 
 func Load(path string) (*Config, error) {
+	configFilePath = path
 	data, err := os.ReadFile(path)
 	if err != nil {
 		if os.IsNotExist(err) {
@@ -73,6 +85,14 @@ func defaultConfig() *Config {
 func (c *Config) Save(path string) error {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
+
+	dir := filepath.Dir(path)
+	if dir != "" && dir != "." {
+		if err := os.MkdirAll(dir, 0755); err != nil {
+			return err
+		}
+	}
+
 	data, err := json.MarshalIndent(c, "", "  ")
 	if err != nil {
 		return err