/*
 * Copyright (c) 2016 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */

package codetoanalyze.java.quandary;

import java.net.URISyntaxException;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.webkit.JavascriptInterface;
import android.webkit.JsPromptResult;
import android.webkit.JsResult;
import android.webkit.ValueCallback;
import android.webkit.WebChromeClient;
import android.webkit.WebMessage;
import android.webkit.WebResourceRequest;
import android.webkit.WebResourceResponse;
import android.webkit.WebView;
import android.webkit.WebViewClient;

import com.facebook.infer.builtins.InferTaint;

public class WebViews {

  void callWebviewSinks(WebView webview) {
    String stringSource = (String) InferTaint.inferSecretSource();

    webview.evaluateJavascript(stringSource, null);
    webview.loadData(stringSource, "", "");
    webview.loadDataWithBaseURL("", stringSource, "", "", "");
    webview.loadUrl(stringSource); // should have 5 reports
    webview.postWebMessage(null, (Uri) InferTaint.inferSecretSource());
  }

  // make sure all of the rules apply to subclasses as well
  class MyWebView extends WebView {
    public MyWebView(Context c) {
      super(c);
    }
  }

  Activity mActivity;

  class MyWebViewClient extends WebViewClient {

    @Override
    public void onLoadResource(WebView w, String url) {
      try {
        Intent.parseUri(url, 0); // should report
      } catch (URISyntaxException e) {
      }
    }

    @Override
    public WebResourceResponse shouldInterceptRequest(WebView w, WebResourceRequest request) {
      mActivity.startActivity(new Intent("action", request.getUrl())); // should report
      return null;
    }

    @Override
    public boolean shouldOverrideUrlLoading(WebView w, String url) {
      try {
        Intent.parseUri(url, 0); // should report
      } catch (URISyntaxException e) {
      }
      return false;
    }
  }

  class MyWebChromeClient extends WebChromeClient {

    @Override
    public boolean onJsAlert(WebView w, String url, String message, JsResult result) {
      try {
        Intent.parseUri(url, 0); // should report
      } catch (URISyntaxException e) {
      }
      return false;
    }

    @Override
    public boolean onJsBeforeUnload(WebView w, String url, String m, JsResult result) {
      try {
        Intent.parseUri(url, 0); // should report
      } catch (URISyntaxException e) {
      }
      return false;
    }

    @Override
    public boolean onJsConfirm(WebView w, String url, String m, JsResult result) {
      try {
        Intent.parseUri(url, 0); // should report
      } catch (URISyntaxException e) {
      }
      return false;
    }

    @Override
    public boolean onJsPrompt(WebView w, String url, String m, String s, JsPromptResult result) {
      try {
        Intent.parseUri(url, 0); // should report
      } catch (URISyntaxException e) {
      }
      return false;
    }
  }

  void callWebviewSubclassSink(MyWebView webview) {
    String stringSource = (String) InferTaint.inferSecretSource();
    webview.evaluateJavascript(stringSource, null);
  }

  class JsObject {
    @JavascriptInterface
    Object returnSource() {
      return InferTaint.inferSecretSource();
    }
  }

  // in order to get this, we have to understand that addJavaScriptInterface can evaluate the
  // JsObject.returnSource method
  void FN_addJavascriptInterface(MyWebView webview) {
    // should warn here
    webview.addJavascriptInterface(new JsObject(), "injectedObject");
  }

}