Java tutorial
/* * Overchan Android (Meta Imageboard Client) * Copyright (C) 2014-2015 miku-nyan <https://github.com/miku-nyan> * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ package nya.miku.wishmaster.http.recaptcha; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.InputStream; import nya.miku.wishmaster.api.interfaces.CancellableTask; import nya.miku.wishmaster.common.IOUtils; import nya.miku.wishmaster.common.Logger; import nya.miku.wishmaster.common.MainApplication; import nya.miku.wishmaster.http.client.ExtendedHttpClient; import nya.miku.wishmaster.http.streamer.HttpRequestModel; import nya.miku.wishmaster.http.streamer.HttpResponseModel; import nya.miku.wishmaster.http.streamer.HttpStreamer; import org.apache.http.Header; import org.apache.http.HttpHeaders; import org.apache.http.HttpHost; import org.apache.http.client.HttpClient; import org.apache.http.conn.params.ConnRouteParams; import org.apache.http.message.BasicHeader; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.content.Context; import android.net.http.SslError; import android.os.Build; import android.os.Handler; import android.webkit.SslErrorHandler; import android.webkit.WebResourceResponse; import android.webkit.WebView; import android.webkit.WebViewClient; /* Google ? ?? ? org.apache.http "deprecated" API 22 (Android 5.1) * ? ? ??? ? ?? apache-hc httpclient 4.3.5.1-android * ?: https://issues.apache.org/jira/browse/HTTPCLIENT-1632 */ @SuppressWarnings("deprecation") public class RecaptchaAjax { private static final String TAG = "RecaptchaAjax"; private static final long TIMEOUT = 30 * 1000; private static final String CUSTOM_UA = "Mozilla/5.0"; private static final String CHALLENGE_FILTER = "/recaptcha/api/image?c="; private RecaptchaAjax() { } private static Handler sHandler = null; public static void init() { sHandler = new Handler(); } static String getChallenge(String key, CancellableTask task, HttpClient httpClient, String scheme) throws Exception { if (sHandler == null) throw new Exception("handler == null (not initialized in UI thread)"); if (scheme == null) scheme = "http"; String address = scheme + "://127.0.0.1/"; String data = "<script type=\"text/javascript\"> " + "var RecaptchaOptions = { " + "theme : 'custom', " + "custom_theme_widget: 'recaptcha_widget' " + "}; " + "</script>" + "<div id=\"recaptcha_widget\" style=\"display:none\"> " + "<div id=\"recaptcha_image\"></div> " + "<input type=\"text\" id=\"recaptcha_response_field\" name=\"recaptcha_response_field\" /> " + "</div>" + "<script type=\"text/javascript\" src=\"" + scheme + "://www.google.com/recaptcha/api/challenge?k=" + key + "\"></script>"; HttpHost proxy = null; if (httpClient instanceof ExtendedHttpClient) { proxy = ((ExtendedHttpClient) httpClient).getProxy(); } else if (httpClient != null) { try { proxy = ConnRouteParams.getDefaultProxy(httpClient.getParams()); } catch (Exception e) { /*ignore*/ } } if (proxy != null && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) { return Intercepting.getInternal(address, data, task, httpClient); } else { return getChallengeInternal(address, data, task, proxy); } } private static class Holder { volatile WebView webView = null; volatile String challenge = null; } private static String getChallengeFromImageUrl(String url) { if (url.contains(CHALLENGE_FILTER)) { String challenge = url.substring(url.indexOf(CHALLENGE_FILTER) + CHALLENGE_FILTER.length()); int index = challenge.indexOf('&'); if (index >= 0) challenge = challenge.substring(0, index); if (challenge.length() > 0) return challenge; } return null; } private static String getChallengeInternal(final String address, final String data, CancellableTask task, final HttpHost proxy) throws Exception { Logger.d(TAG, "not intercepting; proxy: " + (proxy == null ? "disabled" : "enabled")); if (proxy != null) { Logger.d(TAG, "AJAX recaptcha not using (proxy and old API)"); throw new Exception("proxy && old API"); //? ? ? ? reflection ???, .. js-antiddos, ? ( noscript ) } final Context context = MainApplication.getInstance(); final Holder holder = new Holder(); sHandler.post(new Runnable() { @SuppressLint("SetJavaScriptEnabled") @Override public void run() { holder.webView = new WebView(context); holder.webView.setWebViewClient(new WebViewClient() { @Override public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { handler.proceed(); } @Override public void onLoadResource(WebView view, String url) { String challenge = getChallengeFromImageUrl(url); if (challenge != null) holder.challenge = challenge; super.onLoadResource(view, url); } }); holder.webView.getSettings().setUserAgentString(CUSTOM_UA); holder.webView.getSettings().setJavaScriptEnabled(true); holder.webView.loadDataWithBaseURL(address, data, "text/html", "UTF-8", null); } }); long startTime = System.currentTimeMillis(); while (holder.challenge == null) { long time = System.currentTimeMillis() - startTime; if ((task != null && task.isCancelled()) || time > TIMEOUT) break; Thread.yield(); } sHandler.post(new Runnable() { @Override public void run() { try { holder.webView.stopLoading(); holder.webView.clearCache(true); holder.webView.destroy(); } catch (Exception e) { Logger.e(TAG, e); } } }); if (holder.challenge == null) throw new RecaptchaException("couldn't get Recaptcha Challenge (AJAX)"); return holder.challenge; } @TargetApi(Build.VERSION_CODES.HONEYCOMB) private static class Intercepting { private static String getInternal(final String url, final String data, final CancellableTask task, final HttpClient client) throws Exception { Logger.d(TAG, "intercepting"); final Context context = MainApplication.getInstance(); final Holder holder = new Holder(); Header[] uaHeader = new Header[] { new BasicHeader(HttpHeaders.USER_AGENT, CUSTOM_UA) }; final HttpRequestModel rqModel = HttpRequestModel.builder().setGET().setCustomHeaders(uaHeader).build(); sHandler.post(new Runnable() { @SuppressLint("SetJavaScriptEnabled") @Override public void run() { holder.webView = new WebView(context); holder.webView.setWebViewClient(new WebViewClient() { @Override public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { handler.proceed(); } @Override public WebResourceResponse shouldInterceptRequest(WebView view, String url) { String challenge = getChallengeFromImageUrl(url); if (challenge != null) holder.challenge = challenge; if (url.startsWith("http://127.0.0.1") || url.startsWith("https://127.0.0.1")) return new WebResourceResponse("text/html", "UTF-8", new ByteArrayInputStream("127.0.0.1".getBytes())); HttpResponseModel responseModel = null; try { responseModel = HttpStreamer.getInstance().getFromUrl(url, rqModel, client, null, task); for (int i = 0; i < 3 && responseModel.statusCode == 400; ++i) { Logger.d(TAG, "HTTP 400"); responseModel.release(); responseModel = HttpStreamer.getInstance().getFromUrl(url, rqModel, client, null, task); } BufOutputStream output = new BufOutputStream(); IOUtils.copyStream(responseModel.stream, output); return new WebResourceResponse(null, null, output.toInputStream()); } catch (Exception e) { Logger.e(TAG, e); } finally { if (responseModel != null) responseModel.release(); } return new WebResourceResponse("text/html", "UTF-8", new ByteArrayInputStream("something wrong".getBytes())); } }); holder.webView.getSettings().setJavaScriptEnabled(true); holder.webView.loadDataWithBaseURL(url, data, "text/html", "UTF-8", null); } }); long startTime = System.currentTimeMillis(); while (holder.challenge == null) { long time = System.currentTimeMillis() - startTime; if ((task != null && task.isCancelled()) || time > TIMEOUT) break; Thread.yield(); } sHandler.post(new Runnable() { @Override public void run() { try { holder.webView.stopLoading(); holder.webView.clearCache(true); holder.webView.destroy(); } catch (Exception e) { Logger.e(TAG, e); } } }); if (holder.challenge == null) throw new RecaptchaException("couldn't get Recaptcha Challenge (AJAX-Intercept)"); return holder.challenge; } private static class BufOutputStream extends ByteArrayOutputStream { public BufOutputStream() { super(1024); } public InputStream toInputStream() { return new ByteArrayInputStream(buf, 0, count); } } } }