gooNproxy/main.go at main · TheCodingSoldier/gooNproxy · GitHub

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package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"html/template"
	"io"
	"math/rand"
	"net/http"
	"net/url"
	"os"
	"strconv"
	"strings"
	"time"
)

type hop struct {
	IP  string `json:"ip"`
	MAC string `json:"mac"`
}

type hopChain struct {
	Hops []hop `json:"hops"`
}

type randomizer struct {
	r *rand.Rand
}

func newRandomizer(seed int64) *randomizer {
	return &randomizer{r: rand.New(rand.NewSource(seed))}
}

func (r *randomizer) buildChain(count int) hopChain {
	if count < 1 {
		count = 1
	}
	hops := make([]hop, 0, count)
	for i := 0; i < count; i++ {
		hops = append(hops, hop{
			IP:  fmt.Sprintf("%d.%d.%d.%d", r.r.Intn(223)+1, r.r.Intn(256), r.r.Intn(256), r.r.Intn(256)),
			MAC: fmt.Sprintf("%02x:%02x:%02x:%02x:%02x:%02x", r.r.Intn(256), r.r.Intn(256), r.r.Intn(256), r.r.Intn(256), r.r.Intn(256), r.r.Intn(256)),
		})
	}
	return hopChain{Hops: hops}
}

type app struct {
	client       *http.Client
	randomSource *randomizer
	publicURL    string
}

const (
	appName      = "gooNproxy"
	appVersion   = "1.0"
	torProxyEnv  = "GOONPROXY_TOR_PROXY"
	publicURLEnv = "GOONPROXY_PUBLIC_URL"
)

const page = `<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>` + appName + `</title>
  <style>
    body { font-family: Arial, sans-serif; margin: 2rem; max-width: 900px; }
    .card { border: 1px solid #ddd; border-radius: 8px; padding: 1rem; margin-top: 1rem; }
    input[type=text] { width: 70%; padding: .5rem; }
    button { padding: .5rem .8rem; }
    pre { white-space: pre-wrap; word-break: break-word; background:#fafafa; padding: 1rem; border-radius: 8px; }
    .error { color: #b00020; font-weight: bold; }
  </style>
</head>
<body>
  <h1>` + appName + `</h1>
  <p>Privacy-focused search proxy with simulated multi-hop IP/MAC randomization.</p>
  {{ if .PublicURL }}
  <p><strong>Public website:</strong> <a href="{{ .PublicURL }}">{{ .PublicURL }}</a></p>
  {{ end }}
  <form method="get" action="/search">
    <label for="q">Search</label><br>
    <input id="q" name="q" type="text" value="{{ .Query }}" placeholder="type your query">
    <button type="submit">Search via proxy</button>
  </form>
  {{ if .ErrorMessage }}
  <p class="error">{{ .ErrorMessage }}</p>
  {{ end }}
  {{ if .ShowResult }}
  <div class="card">
    <h2>Search Result (DuckDuckGo via proxy)</h2>
    <p><strong>Target:</strong> {{ .TargetURL }}</p>
    <h3>Simulated Multi-hop Identity Chain</h3>
    <pre>{{ .ChainJSON }}</pre>
    <h3>Response Preview</h3>
    <pre>{{ .ResultPreview }}</pre>
  </div>
  {{ end }}
  <div class="card">
    <h2>Random Chain (Website Tool)</h2>
    <p>Generate a randomized hop chain directly from the web interface.</p>
    <label for="hops">Hops (1-10)</label>
    <input id="hops" type="number" min="1" max="10" value="3">
    <button id="generateChain" type="button">Generate chain</button>
    <pre id="chainOutput">Press "Generate chain" to load JSON from /api/random-chain.</pre>
  </div>
  <script>
    (function () {
      var button = document.getElementById('generateChain');
      var hopsInput = document.getElementById('hops');
      var output = document.getElementById('chainOutput');
      if (!button || !hopsInput || !output) {
        return;
      }
      button.addEventListener('click', function () {
        var hops = hopsInput.value || '3';
        fetch('/api/random-chain?hops=' + encodeURIComponent(hops))
          .then(function (response) {
            return response.text().then(function (body) {
              return { ok: response.ok, body: body };
            });
          })
          .then(function (result) {
            output.textContent = result.body;
            if (!result.ok) {
              output.textContent = 'Request failed: ' + result.body;
            }
          })
          .catch(function (error) {
            output.textContent = 'Request failed: ' + error;
          });
      });
    })();
  </script>
</body>
</html>`

var tmpl = template.Must(template.New("page").Parse(page))

type pageData struct {
	Query         string
	ShowResult    bool
	TargetURL     string
	ChainJSON     string
	ResultPreview string
	ErrorMessage  string
	PublicURL     string
}

func renderPage(w http.ResponseWriter, data pageData) error {
	var buf bytes.Buffer
	if err := tmpl.Execute(&buf, data); err != nil {
		return err
	}
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	_, err := w.Write(buf.Bytes())
	return err
}

func (a *app) index(w http.ResponseWriter, r *http.Request) {
	if err := renderPage(w, pageData{PublicURL: a.publicURL}); err != nil {
		http.Error(w, "failed to render page", http.StatusInternalServerError)
	}
}

func (a *app) search(w http.ResponseWriter, r *http.Request) {
	query := strings.TrimSpace(r.URL.Query().Get("q"))
	if query == "" {
		w.WriteHeader(http.StatusBadRequest)
		if err := renderPage(w, pageData{ErrorMessage: "Please enter a search query."}); err != nil {
			http.Error(w, "failed to render page", http.StatusInternalServerError)
		}
		return
	}

	target := "https://duckduckgo.com/html/?q=" + url.QueryEscape(query)
	req, err := http.NewRequestWithContext(r.Context(), http.MethodGet, target, nil)
	if err != nil {
		http.Error(w, "failed to create upstream request", http.StatusInternalServerError)
		return
	}
	req.Header.Set("User-Agent", appName+"/"+appVersion+" (+privacy-search-proxy)")

	chain := a.randomSource.buildChain(3)
	chainBytes, err := json.MarshalIndent(chain, "", "  ")
	if err != nil {
		http.Error(w, "failed to build randomized chain", http.StatusInternalServerError)
		return
	}
	resultPreview := ""

	res, err := a.client.Do(req)
	if err != nil {
		resultPreview = "upstream request failed: " + err.Error()
	} else {
		defer res.Body.Close()
		body, readErr := io.ReadAll(io.LimitReader(res.Body, 3000))
		if readErr != nil {
			resultPreview = "upstream response read failed: " + readErr.Error()
		} else {
			resultPreview = string(body)
		}
	}

	data := pageData{
		Query:         query,
		ShowResult:    true,
		TargetURL:     target,
		ChainJSON:     string(chainBytes),
		ResultPreview: resultPreview,
		PublicURL:     a.publicURL,
	}

	if err := renderPage(w, data); err != nil {
		http.Error(w, "failed to render search result", http.StatusInternalServerError)
	}
}

func (a *app) apiChain(w http.ResponseWriter, r *http.Request) {
	hops := 3
	if val := strings.TrimSpace(r.URL.Query().Get("hops")); val != "" {
		parsed, err := strconv.Atoi(val)
		if err != nil || parsed < 1 || parsed > 10 {
			http.Error(w, "hops must be an integer between 1 and 10", http.StatusBadRequest)
			return
		}
		hops = parsed
	}
	chain := a.randomSource.buildChain(hops)
	var buf bytes.Buffer
	if err := json.NewEncoder(&buf).Encode(chain); err != nil {
		http.Error(w, "failed to encode randomized chain", http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "application/json")
	if _, err := w.Write(buf.Bytes()); err != nil {
		fmt.Fprintf(os.Stderr, "failed writing api response: %v\n", err)
	}
}

func parseTorProxyURL(rawTorProxy string) (*url.URL, error) {
	parsed, err := url.Parse(rawTorProxy)
	if err != nil {
		return nil, err
	}
	if parsed.Host == "" {
		return nil, fmt.Errorf("tor proxy URL missing host component")
	}
	if parsed.Scheme != "socks5" && parsed.Scheme != "socks5h" {
		return nil, fmt.Errorf("unsupported scheme %q: expected socks5 or socks5h", parsed.Scheme)
	}
	return parsed, nil
}

func parsePublicURL(rawPublicURL string) (*url.URL, error) {
	parsed, err := url.Parse(rawPublicURL)
	if err != nil {
		return nil, err
	}
	if parsed.Host == "" {
		return nil, fmt.Errorf("public URL missing host component")
	}
	if parsed.Scheme != "http" && parsed.Scheme != "https" {
		return nil, fmt.Errorf("unsupported scheme %q: expected http or https", parsed.Scheme)
	}
	return parsed, nil
}

func newHTTPClient() *http.Client {
	transport := http.DefaultTransport.(*http.Transport).Clone()
	transport.Proxy = http.ProxyFromEnvironment

	if rawTorProxy := strings.TrimSpace(os.Getenv(torProxyEnv)); rawTorProxy != "" {
		if parsed, err := parseTorProxyURL(rawTorProxy); err == nil {
			transport.Proxy = http.ProxyURL(parsed)
		} else {
			fmt.Fprintf(os.Stderr, "invalid %s value: %v; expected socks5://host:port or socks5h://host:port\n", torProxyEnv, err)
		}
	}

	return &http.Client{
		Timeout:   15 * time.Second,
		Transport: transport,
	}
}

func routes(now time.Time) http.Handler {
	publicURL := ""
	if rawPublicURL := strings.TrimSpace(os.Getenv(publicURLEnv)); rawPublicURL != "" {
		if parsed, err := parsePublicURL(rawPublicURL); err == nil {
			publicURL = parsed.String()
		} else {
			fmt.Fprintf(os.Stderr, "invalid %s value: %v; expected http://host or https://host\n", publicURLEnv, err)
		}
	}

	a := &app{
		client:       newHTTPClient(),
		randomSource: newRandomizer(now.UnixNano()),
		publicURL:    publicURL,
	}
	mux := http.NewServeMux()
	mux.HandleFunc("/", a.index)
	mux.HandleFunc("/search", a.search)
	mux.HandleFunc("/api/random-chain", a.apiChain)
	return mux
}

func main() {
	server := &http.Server{
		Addr:              ":8080",
		Handler:           routes(time.Now()),
		ReadHeaderTimeout: 5 * time.Second,
	}
	if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
		fmt.Fprintf(os.Stderr, "server failed: %v\n", err)
	}
}