更新 config/config.go
This commit is contained in:
361
config/config.go
361
config/config.go
@@ -1,97 +1,302 @@
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// config/config.go
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package config
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package proxy
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import (
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"bytes"
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"compress/gzip"
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"io"
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"log"
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"os"
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"strconv"
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"net/http"
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"net/url"
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"strings"
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"time"
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"siteproxy/cache"
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"siteproxy/security"
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)
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type Config struct {
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// 认证
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Username string
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Password string
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SessionSecret string
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SessionTimeout time.Duration
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// 安全
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RateLimit int
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RateLimitWindow time.Duration
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MaxResponseSize int64
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// 代理
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AllowedSchemes []string
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BlockedDomains map[string]bool
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BlockedCIDRs []string
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UserAgent string
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// 缓存
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CacheEnabled bool
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CacheMaxSize int64
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CacheTTL time.Duration
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type ProxyHandler struct {
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validator *security.RequestValidator
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rateLimiter *security.RateLimiter
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cache *cache.MemoryCache
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userAgent string
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maxResponseSize int64
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}
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func LoadFromEnv() *Config {
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cfg := &Config{
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Username: getEnv("AUTH_USERNAME", "admin"),
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Password: getEnv("AUTH_PASSWORD", "changeme"),
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SessionSecret: getEnv("SESSION_SECRET", generateRandomString(64)),
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SessionTimeout: parseDuration(getEnv("SESSION_TIMEOUT", "30m")),
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RateLimit: parseInt(getEnv("RATE_LIMIT_REQUESTS", "100")),
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RateLimitWindow: parseDuration(getEnv("RATE_LIMIT_WINDOW", "1m")),
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MaxResponseSize: parseInt64(getEnv("MAX_RESPONSE_SIZE", "52428800")), // 50MB
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AllowedSchemes: strings.Split(getEnv("ALLOWED_SCHEMES", "http,https"), ","),
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BlockedDomains: parseBlockedDomains(getEnv("BLOCKED_DOMAINS", "localhost,127.0.0.1,0.0.0.0,internal,*.local")),
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BlockedCIDRs: strings.Split(getEnv("BLOCKED_CIDRS", "10.0.0.0/8,172.16.0.0/12,192.168.0.0/16,169.254.0.0/16,::1/128,fc00::/7,fe80::/10"), ","),
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UserAgent: getEnv("USER_AGENT", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36"),
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CacheEnabled: getEnv("CACHE_ENABLED", "true") == "true",
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CacheMaxSize: parseInt64(getEnv("CACHE_MAX_SIZE", "104857600")), // 100MB
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CacheTTL: parseDuration(getEnv("CACHE_TTL", "1h")),
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func NewHandler(
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validator *security.RequestValidator,
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rateLimiter *security.RateLimiter,
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cache *cache.MemoryCache,
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userAgent string,
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maxResponseSize int64,
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) *ProxyHandler {
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return &ProxyHandler{
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validator: validator,
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rateLimiter: rateLimiter,
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cache: cache,
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userAgent: userAgent,
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maxResponseSize: maxResponseSize,
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}
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}
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func (h *ProxyHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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// 获取目标 URL
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targetURL := r.URL.Query().Get("url")
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if targetURL == "" {
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http.Error(w, "Missing url parameter", http.StatusBadRequest)
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return
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}
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if cfg.Password == "changeme" {
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log.Fatal("Please set AUTH_PASSWORD in .env file")
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// 验证 URL
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if err := h.validator.ValidateURL(targetURL); err != nil {
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log.Printf("URL validation failed: %v", err)
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http.Error(w, "Invalid or blocked URL: "+err.Error(), http.StatusForbidden)
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return
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}
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return cfg
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}
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func getEnv(key, defaultValue string) string {
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if value := os.Getenv(key); value != "" {
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return value
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// 速率限制
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clientIP := getClientIP(r)
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if !h.rateLimiter.Allow(clientIP) {
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http.Error(w, "Rate limit exceeded", http.StatusTooManyRequests)
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return
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}
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return defaultValue
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}
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func parseInt(s string) int {
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v, _ := strconv.Atoi(s)
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return v
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}
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func parseInt64(s string) int64 {
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v, _ := strconv.ParseInt(s, 10, 64)
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return v
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}
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func parseDuration(s string) time.Duration {
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d, _ := time.ParseDuration(s)
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return d
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}
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func parseBlockedDomains(s string) map[string]bool {
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domains := make(map[string]bool)
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for _, d := range strings.Split(s, ",") {
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domains[strings.TrimSpace(d)] = true
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// 检查缓存
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if entry := h.cache.Get(targetURL); entry != nil {
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log.Printf("Cache HIT: %s", targetURL)
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h.serveCached(w, entry)
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return
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}
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return domains
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log.Printf("Cache MISS: %s", targetURL)
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// 创建代理请求
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proxyReq, err := http.NewRequest(r.Method, targetURL, r.Body)
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if err != nil {
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http.Error(w, "Failed to create request", http.StatusInternalServerError)
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return
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}
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// 设置请求头
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h.setProxyHeaders(proxyReq, r)
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// 发送请求
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client := &http.Client{
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Timeout: 30 * time.Second,
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CheckRedirect: func(req *http.Request, via []*http.Request) error {
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// 验证重定向 URL
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if err := h.validator.ValidateURL(req.URL.String()); err != nil {
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return err
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}
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return nil
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},
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}
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resp, err := client.Do(proxyReq)
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if err != nil {
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log.Printf("Request failed: %v", err)
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http.Error(w, "Failed to fetch URL", http.StatusBadGateway)
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return
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}
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defer resp.Body.Close()
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// 读取响应体
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body, err := h.readResponseBody(resp)
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if err != nil {
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log.Printf("Failed to read response: %v", err)
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http.Error(w, "Failed to read response", http.StatusInternalServerError)
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return
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}
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// 重写内容
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contentType := resp.Header.Get("Content-Type")
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body = h.rewriteContent(body, targetURL, contentType)
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// 缓存响应
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if h.shouldCache(resp) {
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h.cache.Set(targetURL, body, resp.Header)
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}
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// 发送响应
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h.sendResponse(w, resp, body)
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}
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func generateRandomString(n int) string {
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// 简单实现，生产环境应使用 crypto/rand
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return "change_this_to_random_string_in_production"
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func (h *ProxyHandler) rewriteContent(body []byte, targetURL, contentType string) []byte {
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rewriter, err := NewContentRewriter(targetURL)
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if err != nil {
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log.Printf("Failed to create rewriter: %v", err)
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return body
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}
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contentType = strings.ToLower(contentType)
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// HTML 内容
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if strings.Contains(contentType, "text/html") {
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rewritten, err := rewriter.RewriteHTML(body)
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if err != nil {
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log.Printf("HTML rewrite failed: %v", err)
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return body
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}
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return rewritten
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}
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// CSS 内容
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if strings.Contains(contentType, "text/css") {
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return rewriter.RewriteCSS(body)
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}
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// JavaScript 内容 - 暂时不重写，可能会破坏功能
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// 未来可以添加更智能的 JS 重写
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return body
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}
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func (h *ProxyHandler) readResponseBody(resp *http.Response) ([]byte, error) {
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var reader io.Reader = resp.Body
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// 处理 gzip 压缩
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if resp.Header.Get("Content-Encoding") == "gzip" {
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gzReader, err := gzip.NewReader(resp.Body)
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if err != nil {
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return nil, err
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}
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defer gzReader.Close()
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reader = gzReader
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}
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// 限制读取大小
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limitReader := io.LimitReader(reader, h.maxResponseSize)
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return io.ReadAll(limitReader)
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}
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func (h *ProxyHandler) setProxyHeaders(proxyReq, originalReq *http.Request) {
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// 复制必要的请求头
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headersToForward := []string{
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"Accept",
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"Accept-Language",
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"Accept-Encoding",
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"Cache-Control",
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"Referer",
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}
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for _, header := range headersToForward {
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if value := originalReq.Header.Get(header); value != "" {
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proxyReq.Header.Set(header, value)
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}
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}
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// 设置自定义 User-Agent
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proxyReq.Header.Set("User-Agent", h.userAgent)
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// 移除可能暴露代理的头
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proxyReq.Header.Del("X-Forwarded-For")
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proxyReq.Header.Del("X-Real-IP")
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proxyReq.Header.Del("Via")
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}
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func (h *ProxyHandler) shouldCache(resp *http.Response) bool {
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// 只缓存成功的 GET 请求
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if resp.Request.Method != "GET" {
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return false
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}
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if resp.StatusCode != http.StatusOK {
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return false
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}
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// 检查 Cache-Control
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cacheControl := resp.Header.Get("Cache-Control")
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if strings.Contains(cacheControl, "no-store") ||
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strings.Contains(cacheControl, "no-cache") ||
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strings.Contains(cacheControl, "private") {
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return false
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}
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// 检查内容类型
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contentType := resp.Header.Get("Content-Type")
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cacheableTypes := []string{
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"text/html",
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"text/css",
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"application/javascript",
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"image/",
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"font/",
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}
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for _, ct := range cacheableTypes {
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if strings.Contains(contentType, ct) {
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return true
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}
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}
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return false
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}
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func (h *ProxyHandler) sendResponse(w http.ResponseWriter, resp *http.Response, body []byte) {
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// 复制响应头
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headersToForward := []string{
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"Content-Type",
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"Content-Language",
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"Last-Modified",
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"ETag",
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"Expires",
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}
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for _, header := range headersToForward {
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if value := resp.Header.Get(header); value != "" {
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w.Header().Set(header, value)
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}
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}
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// 添加自定义头
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w.Header().Set("X-Proxied-By", "SiteProxy")
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w.Header().Set("X-Cache-Status", "MISS")
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// 移除不需要的头
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w.Header().Del("Content-Encoding")
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w.Header().Del("Content-Length")
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// 安全头
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.Header().Set("X-Frame-Options", "SAMEORIGIN")
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w.Header().Set("Referrer-Policy", "no-referrer")
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w.WriteHeader(resp.StatusCode)
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w.Write(body)
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}
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func (h *ProxyHandler) serveCached(w http.ResponseWriter, entry *cache.CacheEntry) {
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for key, value := range entry.Headers {
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w.Header().Set(key, value)
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}
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w.Header().Set("X-Cache-Status", "HIT")
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w.Header().Set("X-Proxied-By", "SiteProxy")
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w.Header().Set("Age", entry.Age())
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w.WriteHeader(http.StatusOK)
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w.Write(entry.Data)
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}
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func getClientIP(r *http.Request) string {
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// 尝试从各种头中获取真实 IP
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if ip := r.Header.Get("X-Real-IP"); ip != "" {
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return ip
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}
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if ip := r.Header.Get("X-Forwarded-For"); ip != "" {
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// X-Forwarded-For 可能包含多个 IP
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ips := strings.Split(ip, ",")
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if len(ips) > 0 {
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return strings.TrimSpace(ips[0])
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}
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}
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// 使用远程地址
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ip := r.RemoteAddr
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if idx := strings.LastIndex(ip, ":"); idx != -1 {
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ip = ip[:idx]
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}
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return ip
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}
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Block a user