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617 lines
19 KiB
617 lines
19 KiB
package main
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import (
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"bytes"
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"compress/gzip"
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"net/http/httputil"
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neturl "net/url"
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"os/exec"
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"runtime"
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"strings"
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"time"
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"github.com/bschaatsbergen/dnsdialer"
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)
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const captchaListenPort = "8765"
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type browserCommand struct {
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name string
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args []string
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}
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func localCaptchaOrigin() string {
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return "http://localhost:" + captchaListenPort
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}
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func localCaptchaListenAddrs() []string {
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return []string{
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"127.0.0.1:" + captchaListenPort,
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"[::1]:" + captchaListenPort,
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}
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}
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func localCaptchaHosts() []string {
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return []string{
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"localhost:" + captchaListenPort,
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"127.0.0.1:" + captchaListenPort,
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"[::1]:" + captchaListenPort,
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}
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}
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func isLocalCaptchaHost(host string) bool {
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for _, localHost := range localCaptchaHosts() {
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if strings.EqualFold(host, localHost) {
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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 localCaptchaURLForTarget(targetURL *neturl.URL) string {
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localURL := &neturl.URL{
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Scheme: "http",
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Host: "localhost:" + captchaListenPort,
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Path: targetURL.Path,
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RawPath: targetURL.RawPath,
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RawQuery: targetURL.RawQuery,
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}
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if localURL.Path == "" {
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localURL.Path = "/"
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}
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return localURL.String()
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}
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func targetOrigin(targetURL *neturl.URL) string {
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return targetURL.Scheme + "://" + targetURL.Host
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}
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func isSafeLocalRedirectPath(raw string) bool {
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if raw == "" || raw[0] != '/' {
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return false
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}
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if len(raw) > 1 && (raw[1] == '/' || raw[1] == '\\') {
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return false
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}
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return true
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}
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func rewriteProxyRedirectLocation(raw string, targetURL *neturl.URL) (string, bool) {
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if isSafeLocalRedirectPath(raw) {
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return raw, true
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}
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parsed, err := neturl.Parse(raw)
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if err != nil {
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return "", false
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}
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if !strings.EqualFold(parsed.Scheme, targetURL.Scheme) || !strings.EqualFold(parsed.Host, targetURL.Host) {
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return "", false
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}
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return localCaptchaURLForTarget(parsed), true
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}
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func rewriteProxyHeaderURL(raw string, targetURL *neturl.URL) string {
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if raw == "" {
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return raw
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}
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parsed, err := neturl.Parse(raw)
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if err != nil {
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return raw
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}
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if parsed.Scheme != "http" || !isLocalCaptchaHost(parsed.Host) {
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return raw
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}
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parsed.Scheme = targetURL.Scheme
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parsed.Host = targetURL.Host
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return parsed.String()
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}
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func rewriteProxyRequest(req *http.Request, targetURL *neturl.URL) {
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req.URL.Scheme = targetURL.Scheme
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req.URL.Host = targetURL.Host
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if req.URL.Path == "" {
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req.URL.Path = targetURL.Path
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}
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req.Host = targetURL.Host
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req.Header.Del("Accept-Encoding")
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req.Header.Del("TE") // Disable transfer encoding compression
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for _, headerName := range []string{"Origin", "Referer"} {
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if rewritten := rewriteProxyHeaderURL(req.Header.Get(headerName), targetURL); rewritten != "" {
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req.Header.Set(headerName, rewritten)
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} else {
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req.Header.Del(headerName)
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}
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}
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}
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func extractSuccessToken(body []byte) string {
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var payload struct {
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Response struct {
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SuccessToken string `json:"success_token"`
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} `json:"response"`
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}
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if err := json.Unmarshal(body, &payload); err != nil {
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return ""
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}
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return payload.Response.SuccessToken
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}
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func rewriteProxyCookies(header http.Header) {
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cookies := (&http.Response{Header: header}).Cookies()
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if len(cookies) == 0 {
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return
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}
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header.Del("Set-Cookie")
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for _, cookie := range cookies {
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cookie.Domain = ""
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cookie.Secure = false
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cookie.Partitioned = false
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if cookie.SameSite == http.SameSiteNoneMode || cookie.SameSite == http.SameSiteStrictMode {
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cookie.SameSite = http.SameSiteLaxMode
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}
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header.Add("Set-Cookie", cookie.String())
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}
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}
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func rewriteCaptchaHTML(html string, targetURL *neturl.URL) string {
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localOrigin := localCaptchaOrigin()
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upstreamOrigin := targetOrigin(targetURL)
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html = strings.ReplaceAll(html, upstreamOrigin, localOrigin)
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script := fmt.Sprintf(`
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<script>
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(function() {
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var localOrigin = %q;
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var upstreamOrigin = %q;
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function rewriteUrl(urlStr) {
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if (!urlStr || typeof urlStr !== 'string') return urlStr;
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if (urlStr.indexOf(localOrigin) === 0) return urlStr;
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if (urlStr.indexOf(upstreamOrigin) === 0) return localOrigin + urlStr.slice(upstreamOrigin.length);
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if (urlStr.indexOf('//') === 0) {
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return '/generic_proxy?proxy_url=' + encodeURIComponent(window.location.protocol + urlStr);
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}
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if (urlStr.indexOf('http://') === 0 || urlStr.indexOf('https://') === 0) {
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return '/generic_proxy?proxy_url=' + encodeURIComponent(urlStr);
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}
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return urlStr;
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}
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function rewriteElementAttr(el, attr) {
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if (!el || !el.getAttribute) return;
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var value = el.getAttribute(attr);
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if (!value) return;
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var rewritten = rewriteUrl(value);
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if (rewritten !== value) {
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el.setAttribute(attr, rewritten);
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}
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}
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function rewriteDocument(root) {
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if (!root || !root.querySelectorAll) return;
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root.querySelectorAll('[href]').forEach(function(el) { rewriteElementAttr(el, 'href'); });
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root.querySelectorAll('[src]').forEach(function(el) { rewriteElementAttr(el, 'src'); });
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root.querySelectorAll('form[action]').forEach(function(el) { rewriteElementAttr(el, 'action'); });
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}
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function handleSuccessToken(token) {
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if (!token) return;
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fetch('/local-captcha-result', {
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method: 'POST',
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headers: {'Content-Type': 'application/x-www-form-urlencoded'},
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body: 'token=' + encodeURIComponent(token)
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}).then(function() {
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document.body.innerHTML = '<h2 style="text-align:center;margin-top:20vh">Done! You can close the page.</h2>';
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setTimeout(function() { window.close(); }, 300);
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}).catch(function() {});
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}
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var origOpen = XMLHttpRequest.prototype.open;
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XMLHttpRequest.prototype.open = function() {
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if (arguments[1] && typeof arguments[1] === 'string') {
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this._origUrl = arguments[1];
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arguments[1] = rewriteUrl(arguments[1]);
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}
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return origOpen.apply(this, arguments);
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};
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var origSend = XMLHttpRequest.prototype.send;
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XMLHttpRequest.prototype.send = function() {
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var xhr = this;
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if (this._origUrl && this._origUrl.indexOf('captchaNotRobot.check') !== -1) {
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xhr.addEventListener('load', function() {
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try {
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var data = JSON.parse(xhr.responseText);
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if (data.response && data.response.success_token) {
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handleSuccessToken(data.response.success_token);
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}
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} catch (e) {}
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});
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}
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return origSend.apply(this, arguments);
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};
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var origFetch = window.fetch;
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if (origFetch) {
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window.fetch = function() {
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var url = arguments[0];
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var isObj = (typeof url === 'object' && url && url.url);
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var urlStr = isObj ? url.url : url;
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var origUrlStr = urlStr;
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if (typeof urlStr === 'string') {
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urlStr = rewriteUrl(urlStr);
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arguments[0] = urlStr;
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}
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var p = origFetch.apply(this, arguments);
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if (typeof origUrlStr === 'string' && origUrlStr.indexOf('captchaNotRobot.check') !== -1) {
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p.then(function(response) {
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return response.clone().json();
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}).then(function(data) {
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if (data.response && data.response.success_token) {
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handleSuccessToken(data.response.success_token);
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}
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}).catch(function() {});
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}
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return p;
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};
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}
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document.addEventListener('submit', function(event) {
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if (event.target && event.target.action) {
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event.target.action = rewriteUrl(event.target.action);
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}
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}, true);
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document.addEventListener('click', function(event) {
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var target = event.target && event.target.closest ? event.target.closest('a[href]') : null;
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if (target && target.href) {
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target.href = rewriteUrl(target.href);
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}
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}, true);
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var origFormSubmit = HTMLFormElement.prototype.submit;
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HTMLFormElement.prototype.submit = function() {
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if (this.action) {
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this.action = rewriteUrl(this.action);
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}
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return origFormSubmit.apply(this, arguments);
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};
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var origWindowOpen = window.open;
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if (origWindowOpen) {
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window.open = function(url) {
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if (typeof url === 'string') {
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arguments[0] = rewriteUrl(url);
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}
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return origWindowOpen.apply(this, arguments);
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};
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}
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rewriteDocument(document);
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if (document.documentElement && window.MutationObserver) {
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new MutationObserver(function(mutations) {
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mutations.forEach(function(mutation) {
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if (mutation.type === 'attributes' && mutation.target) {
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rewriteElementAttr(mutation.target, mutation.attributeName);
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return;
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}
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mutation.addedNodes.forEach(function(node) {
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if (node.nodeType === 1) {
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rewriteDocument(node);
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}
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});
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});
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}).observe(document.documentElement, {
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subtree: true,
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childList: true,
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attributes: true,
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attributeFilter: ['href', 'src', 'action']
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});
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}
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})();
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</script>
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`, localOrigin, upstreamOrigin)
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switch {
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case strings.Contains(html, "</head>"):
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return strings.Replace(html, "</head>", script+"</head>", 1)
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case strings.Contains(html, "</body>"):
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return strings.Replace(html, "</body>", script+"</body>", 1)
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default:
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return html + script
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}
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}
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func newCaptchaProxyTransport(dialer *dnsdialer.Dialer) *http.Transport {
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transport := &http.Transport{
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MaxIdleConns: 100,
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MaxIdleConnsPerHost: 100,
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IdleConnTimeout: 90 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 1 * time.Second,
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ForceAttemptHTTP2: false,
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}
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if dialer != nil {
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transport.DialContext = dialer.DialContext
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}
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return transport
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}
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func startCaptchaServer(srv *http.Server, logPrefix string) error {
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var listenErrs []string
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var listening bool
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for _, addr := range localCaptchaListenAddrs() {
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listener, err := net.Listen("tcp", addr)
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if err != nil {
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listenErrs = append(listenErrs, fmt.Sprintf("%s (%v)", addr, err))
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continue
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}
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listening = true
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go func(listener net.Listener) {
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if err := srv.Serve(listener); err != nil && !errors.Is(err, http.ErrServerClosed) {
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log.Printf("%s: %s", logPrefix, err)
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}
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}(listener)
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}
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if listening {
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return nil
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}
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return fmt.Errorf("captcha listeners failed: %s", strings.Join(listenErrs, "; "))
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}
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// runCaptchaServerAndWait triggers the browser, and waiting gracefully for the solution token.
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func runCaptchaServerAndWait(handler http.Handler, captchaURL string, keyCh <-chan string, logPrefix string) (string, error) {
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srv := &http.Server{Handler: handler}
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if err := startCaptchaServer(srv, logPrefix); err != nil {
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return "", err
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}
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fmt.Println("\n==============================================")
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fmt.Println("ACTION REQUIRED: MANUAL CAPTCHA SOLVING NEEDED")
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fmt.Println("Open this URL in your browser: " + localCaptchaOrigin())
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fmt.Println("==============================================")
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fmt.Println()
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openBrowser(captchaURL)
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key := <-keyCh
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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if err := srv.Shutdown(ctx); err != nil {
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return "", err
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}
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return key, nil
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}
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// notifyKey pushes the key string to the given channel without blocking
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func notifyKey(keyCh chan<- string, key string) {
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if key != "" {
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select {
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case keyCh <- key:
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default:
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}
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}
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}
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func solveCaptchaViaHTTP(captchaImg string) (string, error) {
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keyCh := make(chan string, 1)
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mux := http.NewServeMux()
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, _ = fmt.Fprintf(w, `<!DOCTYPE html>
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<html><head>
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<style>body{font-family:sans-serif;text-align:center;padding:20px}
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img{max-width:100%%;margin:16px 0}
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input{font-size:24px;padding:12px;width:80%%;box-sizing:border-box}
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button{font-size:24px;padding:12px 32px;margin-top:12px;cursor:pointer}</style>
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</head><body>
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<h2>Solve the Captcha</h2>
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<img src="%s" alt="captcha"/>
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<form onsubmit="fetch('/solve?key='+encodeURIComponent(document.getElementById('k').value)).then(()=>{document.body.innerHTML='<h2>Done!</h2>';setTimeout(function(){window.close();}, 300);});return false;">
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<br><input id="k" type="text" autofocus placeholder="Text from image"/>
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<br><button type="submit">Submit</button>
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</form></body></html>`, captchaImg)
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})
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mux.HandleFunc("/solve", func(w http.ResponseWriter, r *http.Request) {
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notifyKey(keyCh, r.URL.Query().Get("key"))
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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_, _ = fmt.Fprint(w, `<!DOCTYPE html><html><body><h2>Done!</h2></body></html>`)
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})
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return runCaptchaServerAndWait(mux, localCaptchaOrigin(), keyCh, "captcha HTTP server error")
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}
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func solveCaptchaViaProxy(redirectURI string, dialer *dnsdialer.Dialer) (string, error) {
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keyCh := make(chan string, 1)
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targetURL, err := neturl.Parse(redirectURI)
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if err != nil {
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return "", fmt.Errorf("invalid redirect URI: %v", err)
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}
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transport := newCaptchaProxyTransport(dialer)
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proxy := &httputil.ReverseProxy{
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Transport: transport,
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Rewrite: func(req *httputil.ProxyRequest) {
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rewriteProxyRequest(req.Out, targetURL)
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},
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ErrorHandler: func(w http.ResponseWriter, r *http.Request, err error) {
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log.Printf("[Captcha Proxy] ERROR for %s %s: %v", r.Method, r.URL.String(), err)
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.WriteHeader(http.StatusBadGateway)
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_, _ = fmt.Fprintf(w, `<!DOCTYPE html><html><body style="font-family:sans-serif;padding:20px"><h2>Captcha proxy error</h2><p>%s %s</p><p>%v</p></body></html>`, r.Method, r.URL.String(), err)
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},
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ModifyResponse: func(res *http.Response) error {
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rewriteProxyCookies(res.Header)
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if res.StatusCode >= 300 && res.StatusCode < 400 {
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if loc := res.Header.Get("Location"); loc != "" {
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log.Printf("[Captcha Proxy] Redirecting to: %s", loc)
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if rewritten, ok := rewriteProxyRedirectLocation(loc, targetURL); ok {
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res.Header.Set("Location", rewritten)
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} else {
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res.Header.Del("Location")
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}
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}
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}
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contentType := res.Header.Get("Content-Type")
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contentEncoding := res.Header.Get("Content-Encoding")
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log.Printf("[Captcha Proxy] %s %d | Content-Type: %q, Encoding: %q", res.Request.Method, res.StatusCode, contentType, contentEncoding)
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shouldInspectBody := strings.Contains(contentType, "text/html") ||
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strings.Contains(contentType, "application/xhtml+xml") ||
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strings.Contains(res.Request.URL.Path, "captchaNotRobot.check")
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if !shouldInspectBody {
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return nil
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}
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reader := res.Body
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if res.Header.Get("Content-Encoding") == "gzip" {
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gzReader, err := gzip.NewReader(res.Body)
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if err == nil {
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reader = gzReader
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defer func() {
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if err := gzReader.Close(); err != nil {
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log.Printf("failed to close gzip reader: %v", err)
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}
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}()
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}
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}
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bodyBytes, err := io.ReadAll(reader)
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if err != nil {
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return err
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}
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if err := res.Body.Close(); err != nil {
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return err
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}
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if strings.Contains(res.Request.URL.Path, "captchaNotRobot.check") {
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notifyKey(keyCh, extractSuccessToken(bodyBytes))
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}
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if strings.Contains(contentType, "text/html") {
|
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for _, headerName := range []string{
|
|
"Content-Security-Policy",
|
|
"Content-Security-Policy-Report-Only",
|
|
"X-Content-Security-Policy",
|
|
"X-WebKit-CSP",
|
|
"Cross-Origin-Opener-Policy",
|
|
"Cross-Origin-Embedder-Policy",
|
|
"Cross-Origin-Resource-Policy",
|
|
"X-Frame-Options",
|
|
"Strict-Transport-Security",
|
|
"Alt-Svc",
|
|
} {
|
|
res.Header.Del(headerName)
|
|
}
|
|
|
|
bodyBytes = []byte(rewriteCaptchaHTML(string(bodyBytes), targetURL))
|
|
res.Header.Del("Content-Encoding")
|
|
}
|
|
|
|
res.Body = io.NopCloser(bytes.NewReader(bodyBytes))
|
|
res.ContentLength = int64(len(bodyBytes))
|
|
res.Header.Set("Content-Length", fmt.Sprint(len(bodyBytes)))
|
|
|
|
return nil
|
|
},
|
|
}
|
|
|
|
mux := http.NewServeMux()
|
|
mux.HandleFunc("/local-captcha-result", func(w http.ResponseWriter, r *http.Request) {
|
|
notifyKey(keyCh, r.FormValue("token")) // r.FormValue automatically parses the form
|
|
w.Header().Set("Access-Control-Allow-Origin", "*")
|
|
_, _ = fmt.Fprint(w, "ok")
|
|
})
|
|
|
|
mux.HandleFunc("/generic_proxy", func(w http.ResponseWriter, r *http.Request) {
|
|
targetAuthURL := r.URL.Query().Get("proxy_url")
|
|
targetParsed, err := neturl.Parse(targetAuthURL)
|
|
if err != nil || targetParsed.Host == "" {
|
|
http.Error(w, "Bad URL", http.StatusBadRequest)
|
|
return
|
|
}
|
|
genericReverse := &httputil.ReverseProxy{
|
|
Transport: transport,
|
|
Rewrite: func(req *httputil.ProxyRequest) {
|
|
req.Out.URL.Path = targetParsed.Path
|
|
req.Out.URL.RawQuery = targetParsed.RawQuery
|
|
rewriteProxyRequest(req.Out, targetParsed)
|
|
},
|
|
}
|
|
genericReverse.ServeHTTP(w, r)
|
|
})
|
|
|
|
mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
|
|
log.Printf("[Captcha Proxy] HTTP %s %s", r.Method, r.URL.String())
|
|
if r.URL.Path == "/" && targetURL.Path != "" && targetURL.Path != "/" && r.URL.RawQuery == "" {
|
|
log.Printf("[Captcha Proxy] Redirecting ROOT to: %s", localCaptchaURLForTarget(targetURL))
|
|
http.Redirect(w, r, localCaptchaURLForTarget(targetURL), http.StatusTemporaryRedirect)
|
|
return
|
|
}
|
|
proxy.ServeHTTP(w, r)
|
|
})
|
|
|
|
return runCaptchaServerAndWait(mux, localCaptchaURLForTarget(targetURL), keyCh, "proxy HTTP server error")
|
|
}
|
|
|
|
func openBrowser(url string) {
|
|
for _, cmd := range browserOpenCommands(runtime.GOOS, url) {
|
|
if err := exec.Command(cmd.name, cmd.args...).Start(); err == nil {
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func browserOpenCommands(goos string, url string) []browserCommand {
|
|
switch goos {
|
|
case "windows":
|
|
return []browserCommand{{name: "cmd", args: []string{"/c", "start", url}}}
|
|
case "darwin":
|
|
return []browserCommand{{name: "open", args: []string{url}}}
|
|
case "linux":
|
|
return []browserCommand{
|
|
{name: "xdg-open", args: []string{url}},
|
|
{name: "gio", args: []string{"open", url}},
|
|
}
|
|
case "android":
|
|
return []browserCommand{
|
|
{name: "termux-open-url", args: []string{url}},
|
|
{name: "/system/bin/am", args: []string{"start", "-a", "android.intent.action.VIEW", "-d", url}},
|
|
{name: "am", args: []string{"start", "-a", "android.intent.action.VIEW", "-d", url}},
|
|
{name: "xdg-open", args: []string{url}},
|
|
}
|
|
case "ios":
|
|
return []browserCommand{
|
|
{name: "open", args: []string{url}},
|
|
{name: "uiopen", args: []string{url}},
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|