Golang 广告拦截工具：使用 DNS 解析和 HTTP 代理技术

{/'title/': /'Golang 广告拦截工具：使用 DNS 解析和 HTTP 代理技术/', /'description/': /'本文提供一个使用 Golang 编写的广告拦截工具示例代码，该工具使用 DNS 解析和 HTTP 代理技术来拦截广告，无需使用 hosts 方法或 Web 服务。/', /'keywords/': /'Golang, 广告拦截, DNS 解析, HTTP 代理, 代码示例/', /'content/': /'///'package main//n//nimport (///'fmt///'///'net///'///'net/http///'///'net/url///'///'strings///'///'sync///')//n//n// AdvertisementInterceptor is a custom HTTP transport that intercepts and blocks advertisements//ntype AdvertisementInterceptor struct {//n//tlock sync.Mutex//n//tdns map[string]net.IP//n}//n//n// RoundTrip implements the http.RoundTripper interface//nfunc (ai *AdvertisementInterceptor) RoundTrip(req *http.Request) (*http.Response, error) {//n//t// Check if the request is for a known advertisement domain//n//tif ai.isAdvertisement(req.URL.Host) {//n//t//t// Return a custom response for advertisements//n//t//treturn &http.Response{//n//t//t//tStatusCode: http.StatusForbidden,//n//t//t//tBody: http.NoBody,//n//t//t}, nil//n//t}//n//n//t// Make the actual HTTP request//n//tresp, err := http.DefaultTransport.RoundTrip(req)//n//tif err != nil {//n//t//treturn nil, err//n//t}//n//n//treturn resp, nil//n}//n//n// isAdvertisement checks if a given domain is a known advertisement domain//nfunc (ai *AdvertisementInterceptor) isAdvertisement(domain string) bool {//n//tai.lock.Lock()//n//tdefer ai.lock.Unlock()//n//n//tip, ok := ai.dns[domain]//n//tif !ok {//n//t//t// Perform DNS lookup if the IP is not already known//n//t//tips, err := net.LookupIP(domain)//n//t//tif err != nil {//n//t//t//treturn false//n//t//t}//n//n//t//tif len(ips) > 0 {//n//t//t//tip = ips[0]//n//t//t//tai.dns[domain] = ip//n//t//t}//n//t}//n//n//t// Check if the IP is a known advertisement IP address//n//t// You can add more advertisement IP addresses here//n//tadIPs := []string{/'127.0.0.1/', /'::1/'}//n//tfor _, adIP := range adIPs {//n//t//tif ip.String() == adIP {//n//t//t//treturn true//n//t//t}//n//t}//n//n//treturn false//n}//n//nfunc main() {//n//t// Initialize the AdvertisementInterceptor//n//tai := &AdvertisementInterceptor{//n//t//tdns: make(map[string]net.IP),//n//t}//n//n//t// Configure the HTTP client to use the AdvertisementInterceptor//n//thttpClient := &http.Client{//n//t//tTransport: ai,//n//t}//n//n//t// Make a sample HTTP request//n//tresp, err := httpClient.Get(/'https://example.com/')//n//tif err != nil {//n//t//tfmt.Println(/'Error:/', err)//n//t//treturn//n//t}//n//n//t// Print the response status code//n//tfmt.Println(/'Status Code:/', resp.StatusCode)//n}//n//n// 请注意，此示例代码仅用于演示目的，实际使用中可能需要更复杂的逻辑来检测和拦截广告。/