新增支持: 按不同文件回源不同地址

data/config.json

@@ -1,7 +1,16 @@
 {
   "MAP": {
-    "/path1": "https://path1.com/path/path/path",
-    "/path2": "https://path2.com"
+    "/path1": {
+      "DefaultTarget": "https://path1.com/path/path/path",
+      "ExtensionMap": {
+        "jpg": "https://path1-img.com/path/path/path",
+        "png": "https://path1-img.com/path/path/path"
+      }
+    },
+    "/path2": "https://path2.com",
+    "/path3": {
+      "DefaultTarget": "https://path3.com"
+    }
   },
   "Compression": {
     "Gzip": {
@@ -14,15 +23,15 @@
     }
   },
   "FixedPaths": [
-      {
-          "Path": "/cdnjs",
-          "TargetHost": "cdnjs.cloudflare.com",
-          "TargetURL": "https://cdnjs.cloudflare.com"
-      },
-      {
-          "Path": "/jsdelivr",
-          "TargetHost": "cdn.jsdelivr.net",
-          "TargetURL": "https://cdn.jsdelivr.net"
-      }
+    {
+      "Path": "/cdnjs",
+      "TargetHost": "cdnjs.cloudflare.com",
+      "TargetURL": "https://cdnjs.cloudflare.com"
+    },
+    {
+      "Path": "/jsdelivr",
+      "TargetHost": "cdn.jsdelivr.net",
+      "TargetURL": "https://cdn.jsdelivr.net"
+    }
   ]
 }

internal/config/types.go

@@ -1,9 +1,14 @@
 package config
 
 type Config struct {
-	MAP         map[string]string `json:"MAP"`
-	Compression CompressionConfig `json:"Compression"`
-	FixedPaths  []FixedPathConfig `json:"FixedPaths"` // 新增
+	MAP         map[string]PathConfig `json:"MAP"` // 改为使用PathConfig
+	Compression CompressionConfig     `json:"Compression"`
+	FixedPaths  []FixedPathConfig     `json:"FixedPaths"`
+}
+
+type PathConfig struct {
+	DefaultTarget string            `json:"DefaultTarget"` // 默认回源地址
+	ExtensionMap  map[string]string `json:"ExtensionMap"`  // 特定后缀的回源地址
 }
 
 type CompressionConfig struct {
@@ -21,3 +26,29 @@ type FixedPathConfig struct {
 	TargetHost string `json:"TargetHost"`
 	TargetURL  string `json:"TargetURL"`
 }
+
+// 添加一个辅助方法来处理字符串到 PathConfig 的转换
+func NewPathConfig(target interface{}) PathConfig {
+	switch v := target.(type) {
+	case string:
+		// 简单字符串格式
+		return PathConfig{
+			DefaultTarget: v,
+		}
+	case map[string]interface{}:
+		// 完整配置格式
+		config := PathConfig{
+			DefaultTarget: v["DefaultTarget"].(string),
+		}
+		if extMap, ok := v["ExtensionMap"].(map[string]interface{}); ok {
+			config.ExtensionMap = make(map[string]string)
+			for ext, target := range extMap {
+				config.ExtensionMap[ext] = target.(string)
+			}
+		}
+		return config
+	default:
+		// 处理异常情况
+		return PathConfig{}
+	}
+}

internal/handler/mirror_proxy.go

@@ -1,4 +1,3 @@
-// handler/mirror_proxy.go
 package handler
 
 import (

internal/handler/proxy.go

@@ -6,6 +6,8 @@ import (
 	"log"
 	"net/http"
 	"net/url"
+	"path"
+	"proxy-go/internal/config"
 	"proxy-go/internal/utils"
 	"strings"
 	"time"
@@ -16,12 +18,18 @@ const (
 )
 
 type ProxyHandler struct {
-	pathMap map[string]string
+	pathMap map[string]config.PathConfig
 }
 
-func NewProxyHandler(pathMap map[string]string) *ProxyHandler {
+func NewProxyHandler(pathMap map[string]interface{}) *ProxyHandler {
+	convertedMap := make(map[string]config.PathConfig)
+
+	for path, target := range pathMap {
+		convertedMap[path] = config.NewPathConfig(target)
+	}
+
 	return &ProxyHandler{
-		pathMap: pathMap,
+		pathMap: convertedMap,
 	}
 }
 
@@ -39,11 +47,11 @@ func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	// 查找匹配的代理路径
 	var matchedPrefix string
-	var targetBase string
-	for prefix, target := range h.pathMap {
+	var pathConfig config.PathConfig
+	for prefix, cfg := range h.pathMap {
 		if strings.HasPrefix(r.URL.Path, prefix) {
 			matchedPrefix = prefix
-			targetBase = target
+			pathConfig = cfg
 			break
 		}
 	}
@@ -58,6 +66,7 @@ func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	// 构建目标 URL
 	targetPath := strings.TrimPrefix(r.URL.Path, matchedPrefix)
+
 	// URL 解码，然后重新编码，确保特殊字符被正确处理
 	decodedPath, err := url.QueryUnescape(targetPath)
 	if err != nil {
@@ -67,6 +76,20 @@ func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	// 确定目标基础URL
+	targetBase := pathConfig.DefaultTarget
+
+	// 检查文件扩展名
+	if pathConfig.ExtensionMap != nil {
+		ext := strings.ToLower(path.Ext(decodedPath))
+		if ext != "" {
+			ext = ext[1:] // 移除开头的点
+			if alternativeTarget, exists := pathConfig.ExtensionMap[ext]; exists {
+				targetBase = alternativeTarget
+			}
+		}
+	}
+
 	// 重新编码路径，保留 '/'
 	parts := strings.Split(decodedPath, "/")
 	for i, part := range parts {