Merge pull request #7 from awkj/main

添加 本地 cache 功能，并适当重构代码

ghproxy/main.go

@@ -3,26 +3,68 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"github.com/gin-gonic/gin"
 	"io"
+	"log"
 	"net"
 	"net/http"
 	"os"
+	"path/filepath"
 	"regexp"
 	"strconv"
 	"strings"
 	"sync"
 	"time"
+
+	"crypto/sha256"
+	"encoding/hex"
+
+	"github.com/gin-gonic/gin"
 )
 
 const (
-	sizeLimit = 1024 * 1024 * 1024 * 10 // 允许的文件大小，默认10GB
+	MaxFileSize = 10 * 1024 * 1024 * 1024 // 允许的文件大小，默认10GB
-	host      = "0.0.0.0"               // 监听地址
+	ListenHost  = "0.0.0.0"               // 监听地址
-	port      = 5000                    // 监听端口
+	ListenPort  = 5000                    // 监听端口
+	CacheDir    = "cache"
+	// 是否开启缓存
+	CacheExpiry = 0 * time.Minute // 默认不缓存
 )
 
 var (
-	exps = []*regexp.Regexp{
+	cache      = sync.Map{}
+	exps       = initRegexps()
+	httpClient = initHTTPClient()
+	config     *Config
+	configLock sync.RWMutex
+)
+
+type Config struct {
+	WhiteList []string `json:"whiteList"`
+	BlackList []string `json:"blackList"`
+}
+
+type CachedResponse struct {
+	Header     http.Header
+	StatusCode int
+	Body       []byte
+	Timestamp  time.Time
+}
+
+func init() {
+	if err := os.MkdirAll(CacheDir, 0755); err != nil {
+		log.Fatalf("Failed to create cache directory: %v", err)
+	}
+	go func() {
+		for {
+			time.Sleep(10 * time.Minute)
+			loadConfig()
+		}
+	}()
+	loadConfig()
+}
+
+func initRegexps() []*regexp.Regexp {
+	return []*regexp.Regexp{
 		regexp.MustCompile(`^(?:https?://)?github\.com/([^/]+)/([^/]+)/(?:releases|archive)/.*$`),
 		regexp.MustCompile(`^(?:https?://)?github\.com/([^/]+)/([^/]+)/(?:blob|raw)/.*$`),
 		regexp.MustCompile(`^(?:https?://)?github\.com/([^/]+)/([^/]+)/(?:info|git-).*$`),
@@ -33,21 +75,10 @@ var (
 		regexp.MustCompile(`^(?:https?://)?cdn-lfs\.hf\.co(?:/spaces)?/([^/]+)/([^/]+)(?:/(.*))?$`),
 		regexp.MustCompile(`^(?:https?://)?download\.docker\.com/([^/]+)/.*\.(tgz|zip)$`),
 	}
-	httpClient *http.Client
-	config     *Config
-	configLock sync.RWMutex
-)
-
-type Config struct {
-	WhiteList []string `json:"whiteList"`
-	BlackList []string `json:"blackList"`
 }
 
-func main() {
+func initHTTPClient() *http.Client {
-	gin.SetMode(gin.ReleaseMode)
+	return &http.Client{
-	router := gin.Default()
-
-	httpClient = &http.Client{
 		Transport: &http.Transport{
 			DialContext: (&net.Dialer{
 				Timeout:   30 * time.Second,
@@ -61,30 +92,23 @@ func main() {
 			ResponseHeaderTimeout: 300 * time.Second,
 		},
 	}
+}
 
-	loadConfig()
+func main() {
-	go func() {
+	gin.SetMode(gin.ReleaseMode)
-		for {
+	router := gin.Default()
-			time.Sleep(10 * time.Minute)
-			loadConfig()
-		}
-	}()
-	// 前端访问路径，默认根路径
 	router.Static("/", "./public")
 	router.NoRoute(handler)
 
-	err := router.Run(fmt.Sprintf("%s:%d", host, port))
+	addr := fmt.Sprintf("%s:%d", ListenHost, ListenPort)
-	if err != nil {
+	if err := router.Run(addr); err != nil {
-		fmt.Printf("Error starting server: %v\n", err)
+		log.Fatalf("Error starting server: %v", err)
 	}
 }
 
 func handler(c *gin.Context) {
 	rawPath := strings.TrimPrefix(c.Request.URL.RequestURI(), "/")
-
+	rawPath = strings.TrimPrefix(rawPath, "/")
-	for strings.HasPrefix(rawPath, "/") {
-		rawPath = strings.TrimPrefix(rawPath, "/")
-	}
 
 	if !strings.HasPrefix(rawPath, "http") {
 		c.String(http.StatusForbidden, "无效输入")
@@ -92,20 +116,20 @@ func handler(c *gin.Context) {
 	}
 
 	matches := checkURL(rawPath)
-	if matches != nil {
+	if matches == nil {
-		if len(config.WhiteList) > 0 && !checkList(matches, config.WhiteList) {
-			c.String(http.StatusForbidden, "不在白名单内，限制访问。")
-			return
-		}
-		if len(config.BlackList) > 0 && checkList(matches, config.BlackList) {
-			c.String(http.StatusForbidden, "黑名单限制访问")
-			return
-		}
-	} else {
 		c.String(http.StatusForbidden, "无效输入")
 		return
 	}
 
+	if len(config.WhiteList) > 0 && !checkList(matches, config.WhiteList) {
+		c.String(http.StatusForbidden, "不在白名单内，限制访问。")
+		return
+	}
+	if len(config.BlackList) > 0 && checkList(matches, config.BlackList) {
+		c.String(http.StatusForbidden, "黑名单限制访问")
+		return
+	}
+
 	if exps[1].MatchString(rawPath) {
 		rawPath = strings.Replace(rawPath, "/blob/", "/raw/", 1)
 	}
@@ -114,17 +138,30 @@ func handler(c *gin.Context) {
 }
 
 func proxy(c *gin.Context, u string) {
+	cacheKey := generateCacheKey(u)
+	// 当 CacheExpiry 为 0 时，不使用缓存
+	if CacheExpiry != 0 {
+		if cachedData, ok := cache.Load(cacheKey); ok {
+			log.Printf("Using cached response for %s", u)
+			cached := cachedData.(*CachedResponse)
+			if time.Since(cached.Timestamp) < CacheExpiry {
+				setHeaders(c, cached.Header)
+				c.Status(cached.StatusCode)
+				c.Writer.Write(cached.Body)
+				return
+			}
+		}
+	}
+
+	log.Printf("use proxy response for %s", u)
+
 	req, err := http.NewRequest(c.Request.Method, u, c.Request.Body)
 	if err != nil {
 		c.String(http.StatusInternalServerError, fmt.Sprintf("server error %v", err))
 		return
 	}
 
-	for key, values := range c.Request.Header {
+	copyHeaders(req.Header, c.Request.Header)
-		for _, value := range values {
-			req.Header.Add(key, value)
-		}
-	}
 	req.Header.Del("Host")
 
 	resp, err := httpClient.Do(req)
@@ -132,29 +169,17 @@ func proxy(c *gin.Context, u string) {
 		c.String(http.StatusInternalServerError, fmt.Sprintf("server error %v", err))
 		return
 	}
-	defer func(Body io.ReadCloser) {
+	defer closeWithLog(resp.Body)
-		err := Body.Close()
-		if err != nil {
-
-		}
-	}(resp.Body)
 
 	if contentLength, ok := resp.Header["Content-Length"]; ok {
-		if size, err := strconv.Atoi(contentLength[0]); err == nil && size > sizeLimit {
+		if size, err := strconv.Atoi(contentLength[0]); err == nil && size > MaxFileSize {
 			c.String(http.StatusRequestEntityTooLarge, "File too large.")
 			return
 		}
 	}
 
-	resp.Header.Del("Content-Security-Policy")
+	removeHeaders(resp.Header, "Content-Security-Policy", "Referrer-Policy", "Strict-Transport-Security")
-	resp.Header.Del("Referrer-Policy")
+	setHeaders(c, resp.Header)
-	resp.Header.Del("Strict-Transport-Security")
-
-	for key, values := range resp.Header {
-		for _, value := range values {
-			c.Header(key, value)
-		}
-	}
 
 	if location := resp.Header.Get("Location"); location != "" {
 		if checkURL(location) != nil {
@@ -166,28 +191,51 @@ func proxy(c *gin.Context, u string) {
 	}
 
 	c.Status(resp.StatusCode)
-	if _, err := io.Copy(c.Writer, resp.Body); err != nil {
+	body, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Printf("Failed to read response body: %v", err)
 		return
 	}
+	if _, err := c.Writer.Write(body); err != nil {
+		log.Printf("Failed to write response body: %v", err)
+		return
+	}
+
+	// 当 CacheExpiry 不为 0 时，保存到缓存
+	if CacheExpiry != 0 {
+		// Save to cache
+		cached := &CachedResponse{
+			Header:     resp.Header,
+			StatusCode: resp.StatusCode,
+			Body:       body,
+			Timestamp:  time.Now(),
+		}
+		cache.Store(cacheKey, cached)
+		cacheFilePath := filepath.Join(CacheDir, cacheKey)
+		// 修改 ioutil.WriteFile 为 os.WriteFile
+		if err := os.WriteFile(cacheFilePath, body, 0644); err != nil {
+			log.Printf("Failed to write cache file: %v", err)
+		}
+	}
+}
+
+func generateCacheKey(u string) string {
+	hash := sha256.Sum256([]byte(u))
+	return hex.EncodeToString(hash[:])
 }
 
 func loadConfig() {
 	file, err := os.Open("config.json")
 	if err != nil {
-		fmt.Printf("Error loading config: %v\n", err)
+		log.Printf("Error loading config: %v", err)
 		return
 	}
-	defer func(file *os.File) {
+	defer closeWithLog(file)
-		err := file.Close()
-		if err != nil {
-
-		}
-	}(file)
 
 	var newConfig Config
 	decoder := json.NewDecoder(file)
 	if err := decoder.Decode(&newConfig); err != nil {
-		fmt.Printf("Error decoding config: %v\n", err)
+		log.Printf("Error decoding config: %v", err)
 		return
 	}
 
@@ -213,3 +261,31 @@ func checkList(matches, list []string) bool {
 	}
 	return false
 }
+
+func setHeaders(c *gin.Context, headers http.Header) {
+	for key, values := range headers {
+		for _, value := range values {
+			c.Header(key, value)
+		}
+	}
+}
+
+func copyHeaders(dst, src http.Header) {
+	for key, values := range src {
+		for _, value := range values {
+			dst.Add(key, value)
+		}
+	}
+}
+
+func removeHeaders(headers http.Header, keys ...string) {
+	for _, key := range keys {
+		headers.Del(key)
+	}
+}
+
+func closeWithLog(c io.Closer) {
+	if err := c.Close(); err != nil {
+		log.Printf("Failed to close: %v", err)
+	}
+}