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      1 /*
      2  * Copyright 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package androidx.webkit.internal;
     18 
     19 import android.annotation.SuppressLint;
     20 import android.webkit.WebResourceError;
     21 
     22 import androidx.annotation.NonNull;
     23 import androidx.annotation.RequiresApi;
     24 import androidx.webkit.WebResourceErrorCompat;
     25 import androidx.webkit.WebViewFeature;
     26 
     27 import org.chromium.support_lib_boundary.WebResourceErrorBoundaryInterface;
     28 import org.chromium.support_lib_boundary.util.BoundaryInterfaceReflectionUtil;
     29 
     30 import java.lang.reflect.InvocationHandler;
     31 import java.lang.reflect.Proxy;
     32 
     33 /**
     34  * Implementation of {@link WebResourceErrorCompat}.
     35  * This class uses either the framework, the WebView APK, or both, to implement
     36  * {@link WebResourceErrorCompat} functionality.
     37  *
     38  */
     39 public class WebResourceErrorImpl extends WebResourceErrorCompat {
     40     /**
     41      * Frameworks implementation - do not use this directly, instead use
     42      * {@link #getFrameworksImpl()} to ensure this variable has been instantiated correctly.
     43      */
     44     private WebResourceError mFrameworksImpl;
     45 
     46     /**
     47      * Support library glue implementation - do not use this directly, instead use
     48      * {@link #getBoundaryInterface()} to ensure this variable has been instantiated correctly.
     49      */
     50     private WebResourceErrorBoundaryInterface mBoundaryInterface;
     51 
     52     public WebResourceErrorImpl(@NonNull InvocationHandler invocationHandler) {
     53         mBoundaryInterface = BoundaryInterfaceReflectionUtil.castToSuppLibClass(
     54                 WebResourceErrorBoundaryInterface.class, invocationHandler);
     55     }
     56 
     57     public WebResourceErrorImpl(@NonNull WebResourceError error) {
     58         mFrameworksImpl = error;
     59     }
     60 
     61     @RequiresApi(23)
     62     private WebResourceError getFrameworksImpl() {
     63         if (mFrameworksImpl == null) {
     64             mFrameworksImpl = WebViewGlueCommunicator.getCompatConverter().convertWebResourceError(
     65                     Proxy.getInvocationHandler(mBoundaryInterface));
     66         }
     67         return mFrameworksImpl;
     68     }
     69 
     70     private WebResourceErrorBoundaryInterface getBoundaryInterface() {
     71         if (mBoundaryInterface == null) {
     72             mBoundaryInterface = BoundaryInterfaceReflectionUtil.castToSuppLibClass(
     73                     WebResourceErrorBoundaryInterface.class,
     74                     WebViewGlueCommunicator.getCompatConverter().convertWebResourceError(
     75                             mFrameworksImpl));
     76         }
     77         return mBoundaryInterface;
     78     }
     79 
     80     @SuppressLint("NewApi")
     81     @Override
     82     public int getErrorCode() {
     83         final WebViewFeatureInternal feature =
     84                 WebViewFeatureInternal.getFeature(WebViewFeature.WEB_RESOURCE_ERROR_GET_CODE);
     85         if (feature.isSupportedByFramework()) {
     86             return getFrameworksImpl().getErrorCode();
     87         } else if (feature.isSupportedByWebView()) {
     88             return getBoundaryInterface().getErrorCode();
     89         } else {
     90             throw WebViewFeatureInternal.getUnsupportedOperationException();
     91         }
     92     }
     93 
     94     @SuppressLint("NewApi")
     95     @Override
     96     public CharSequence getDescription() {
     97         final WebViewFeatureInternal feature = WebViewFeatureInternal.getFeature(
     98                         WebViewFeature.WEB_RESOURCE_ERROR_GET_DESCRIPTION);
     99         if (feature.isSupportedByFramework()) {
    100             return getFrameworksImpl().getDescription();
    101         } else if (feature.isSupportedByWebView()) {
    102             return getBoundaryInterface().getDescription();
    103         }
    104         throw WebViewFeatureInternal.getUnsupportedOperationException();
    105     }
    106 }
    107