Implement PacService using WebView's version of libpac.

Add config flag to choose between PacService implementations.
Added flag (config_useWebViewPacProcessor) is disabled
by default for now.

Bug: 148516710
Test: atest DeviceOwnerTest#testProxyPacProxyTest
Change-Id: I5d376a2a37f1bfb7ba5268c0088bf4417434b8f5

4 files changed, 114 insertions, 13 deletions

diff --git a/packages/services/PacProcessor/src/com/android/pacprocessor/LibpacInterface.java b/packages/services/PacProcessor/src/com/android/pacprocessor/LibpacInterface.java
new file mode 100644
index 000000000000..103ef7811ff0
--- /dev/null
+++ b/packages/services/PacProcessor/src/com/android/pacprocessor/LibpacInterface.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.pacprocessor;
+
+/**
+ * Common interface for both Android's and WebView's implementation of PAC processor.
+ *
+ * @hide
+ */
+interface LibpacInterface {
+    default boolean startPacSupport() {
+        return true;
+    }
+
+    default boolean stopPacSupport() {
+        return true;
+    }
+
+    boolean setCurrentProxyScript(String script);
+    String makeProxyRequest(String url, String host);
+}
diff --git a/packages/services/PacProcessor/src/com/android/pacprocessor/PacNative.java b/packages/services/PacProcessor/src/com/android/pacprocessor/PacNative.java
index 1e8109cb393c..9c0cfc27bd14 100644
--- a/packages/services/PacProcessor/src/com/android/pacprocessor/PacNative.java
+++ b/packages/services/PacProcessor/src/com/android/pacprocessor/PacNative.java
@@ -20,7 +20,7 @@ import android.util.Log;
 /**
  * @hide
  */
-public class PacNative {
+public class PacNative implements LibpacInterface {
     private static final String TAG = "PacProxy";
 
     private static final PacNative sInstance = new PacNative();
@@ -49,34 +49,38 @@ public class PacNative {
         return sInstance;
     }
 
+    @Override
     public synchronized boolean startPacSupport() {
         if (createV8ParserNativeLocked()) {
             Log.e(TAG, "Unable to Create v8 Proxy Parser.");
-            return true;
+            return false;
         }
         mIsActive = true;
-        return false;
+        return true;
     }
 
+    @Override
     public synchronized boolean stopPacSupport() {
         if (mIsActive) {
             if (destroyV8ParserNativeLocked()) {
                 Log.e(TAG, "Unable to Destroy v8 Proxy Parser.");
-                return true;
+                return false;
             }
             mIsActive = false;
         }
-        return false;
+        return true;
     }
 
+    @Override
     public synchronized boolean setCurrentProxyScript(String script) {
         if (setProxyScriptNativeLocked(script)) {
             Log.e(TAG, "Unable to parse proxy script.");
-            return true;
+            return false;
         }
-        return false;
+        return true;
     }
 
+    @Override
     public synchronized String makeProxyRequest(String url, String host) {
         String ret = makeProxyRequestNativeLocked(url, host);
         if ((ret == null) || (ret.length() == 0)) {
diff --git a/packages/services/PacProcessor/src/com/android/pacprocessor/PacService.java b/packages/services/PacProcessor/src/com/android/pacprocessor/PacService.java
index b006d6e1fa7b..7aea721617b9 100644
--- a/packages/services/PacProcessor/src/com/android/pacprocessor/PacService.java
+++ b/packages/services/PacProcessor/src/com/android/pacprocessor/PacService.java
@@ -17,6 +17,7 @@ package com.android.pacprocessor;
 
 import android.app.Service;
 import android.content.Intent;
+import android.content.res.Resources;
 import android.os.Binder;
 import android.os.IBinder;
 import android.os.Process;
@@ -30,19 +31,24 @@ import java.net.URL;
 
 public class PacService extends Service {
     private static final String TAG = "PacService";
+    private static final boolean sUseWebViewPacProcessor = Resources.getSystem().getBoolean(
+            com.android.internal.R.bool.config_useWebViewPacProcessor);
+
+    private final LibpacInterface mLibpac = sUseWebViewPacProcessor
+            ? PacWebView.getInstance()
+            : PacNative.getInstance();
 
-    private PacNative mPacNative = PacNative.getInstance();
     private ProxyServiceStub mStub = new ProxyServiceStub();
 
     @Override
     public void onCreate() {
         super.onCreate();
-        mPacNative.startPacSupport();
+        mLibpac.startPacSupport();
     }
 
     @Override
     public void onDestroy() {
-        mPacNative.stopPacSupport();
+        mLibpac.stopPacSupport();
         super.onDestroy();
     }
 
@@ -52,7 +58,6 @@ public class PacService extends Service {
     }
 
     private class ProxyServiceStub extends IProxyService.Stub {
-
         @Override
         public String resolvePacFile(String host, String url) throws RemoteException {
             try {
@@ -69,7 +74,7 @@ public class PacService extends Service {
                         throw new IllegalArgumentException("Invalid host was passed");
                     }
                 }
-                return mPacNative.makeProxyRequest(url, host);
+                return mLibpac.makeProxyRequest(url, host);
             } catch (MalformedURLException e) {
                 throw new IllegalArgumentException("Invalid URL was passed");
             }
@@ -81,7 +86,7 @@ public class PacService extends Service {
                 Log.e(TAG, "Only system user is allowed to call setPacFile");
                 throw new SecurityException();
             }
-            mPacNative.setCurrentProxyScript(script);
+            mLibpac.setCurrentProxyScript(script);
         }
 
         @Override
diff --git a/packages/services/PacProcessor/src/com/android/pacprocessor/PacWebView.java b/packages/services/PacProcessor/src/com/android/pacprocessor/PacWebView.java
new file mode 100644
index 000000000000..89c466500fef
--- /dev/null
+++ b/packages/services/PacProcessor/src/com/android/pacprocessor/PacWebView.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.pacprocessor;
+
+import android.util.Log;
+import android.webkit.PacProcessor;
+
+import com.android.internal.annotations.GuardedBy;
+
+/**
+ * @hide
+ */
+public class PacWebView implements LibpacInterface {
+    private static final String TAG = "PacWebView";
+
+    private static final PacWebView sInstance = new PacWebView();
+
+    private Object mLock = new Object();
+
+    @GuardedBy("mLock")
+    private PacProcessor mProcessor = PacProcessor.getInstance();
+
+    public static PacWebView getInstance() {
+        return sInstance;
+    }
+
+    @Override
+    public boolean setCurrentProxyScript(String script) {
+        synchronized (mLock) {
+            if (!mProcessor.setProxyScript(script)) {
+                Log.e(TAG, "Unable to parse proxy script.");
+                return false;
+            }
+            return true;
+        }
+    }
+
+    @Override
+    public String makeProxyRequest(String url, String host) {
+        synchronized (mLock) {
+            return mProcessor.findProxyForUrl(url);
+        }
+    }
+}