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.cloudflare; 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.http.HttpConstants; 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.client.CookieStore; import org.apache.http.cookie.Cookie; import android.annotation.SuppressLint; import android.annotation.TargetApi; import android.app.Activity; import android.net.http.SslError; import android.os.Build; import android.view.View; import android.view.ViewGroup; import android.webkit.SslErrorHandler; import android.webkit.WebResourceResponse; import android.webkit.WebView; import android.webkit.WebViewClient; /** * Anti-DDOS ? ? webview httpclient (?? API >= 11) * @author miku-nyan * */ /* 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") @TargetApi(Build.VERSION_CODES.HONEYCOMB) /*package*/ class InterceptingAntiDDOS { private static final String TAG = "CloudflareChecker_Intercept"; private InterceptingAntiDDOS() { } private static InterceptingAntiDDOS instanace; static synchronized InterceptingAntiDDOS getInstance() { if (instanace == null) instanace = new InterceptingAntiDDOS(); return instanace; } private volatile boolean processing = false; private volatile boolean processing2 = false; private volatile Cookie currentCookie; private volatile WebView webView; private Object lock = new Object(); /*package*/ boolean isProcessing() { return processing; } /** anti-DDOS , ? ? ?? webview httpclient (? ?? ? ?-? API >= 11) */ Cookie check(final CloudflareException exception, final ExtendedHttpClient httpClient, final CancellableTask task, final Activity activity) { synchronized (lock) { if (processing) return null; processing = true; } processing2 = true; currentCookie = null; final HttpRequestModel rqModel = HttpRequestModel.builder().setGET().build(); final CookieStore cookieStore = httpClient.getCookieStore(); CloudflareChecker.removeCookie(cookieStore, exception.getRequiredCookieName()); final ViewGroup layout = (ViewGroup) activity.getWindow().getDecorView().getRootView(); final WebViewClient client = new WebViewClient() { @Override public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { handler.proceed(); } @Override public WebResourceResponse shouldInterceptRequest(WebView view, String url) { HttpResponseModel responseModel = null; try { responseModel = HttpStreamer.getInstance().getFromUrl(url, rqModel, httpClient, 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, httpClient, null, task); } for (Cookie cookie : cookieStore.getCookies()) { if (CloudflareChecker.isClearanceCookie(cookie, url, exception.getRequiredCookieName())) { Logger.d(TAG, "Cookie found: " + cookie.getValue()); currentCookie = cookie; processing2 = false; return new WebResourceResponse("text/html", "UTF-8", new ByteArrayInputStream("cookie received".getBytes())); } } 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())); } }; activity.runOnUiThread(new Runnable() { @SuppressLint("SetJavaScriptEnabled") @Override public void run() { webView = new WebView(activity); webView.setVisibility(View.GONE); layout.addView(webView); webView.setWebViewClient(client); webView.getSettings().setUserAgentString(HttpConstants.USER_AGENT_STRING); webView.getSettings().setJavaScriptEnabled(true); webView.loadUrl(exception.getCheckUrl()); } }); long startTime = System.currentTimeMillis(); while (processing2) { long time = System.currentTimeMillis() - startTime; if ((task != null && task.isCancelled()) || time > CloudflareChecker.TIMEOUT) { processing2 = false; } } activity.runOnUiThread(new Runnable() { @Override public void run() { try { layout.removeView(webView); webView.stopLoading(); webView.clearCache(true); webView.destroy(); webView = null; } finally { processing = false; } } }); return currentCookie; } private static class BufOutputStream extends ByteArrayOutputStream { public BufOutputStream() { super(1024); } public InputStream toInputStream() { return new ByteArrayInputStream(buf, 0, count); } } }