[Android WebView] Implement initial settings and callback support for Service Workers.

android_webview/java/src/org/chromium/android_webview/AwServiceWorkerSettings.java

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.android_webview;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.os.Process;
+import android.webkit.WebSettings;
+
+import org.chromium.base.Log;
+import org.chromium.base.annotations.JNINamespace;
+
+/**
+ * Stores Android WebView Service Worker specific settings.
+ *
+ * Methods in this class can be called from any thread, including threads created by
+ * the client of WebView.
+ */
+@JNINamespace("android_webview")
+public class AwServiceWorkerSettings {
+    private static final String LOGTAG = AwServiceWorkerSettings.class.getSimpleName();
+    private static final boolean TRACE = false;
+
+    private int mCacheMode = WebSettings.LOAD_DEFAULT;
+    private boolean mAllowContentUrlAccess = true;
+    private boolean mAllowFileUrlAccess = true;
+    private boolean mBlockNetworkLoads;  // Default depends on permission of the embedding APK
+    private boolean mAcceptThirdPartyCookies = false;
+
+    // Lock to protect all settings.
+    private final Object mAwServiceWorkerSettingsLock = new Object();
+
+    // Computed on construction.
+    private final boolean mHasInternetPermission;
+
+    public AwServiceWorkerSettings(Context context) {
+        boolean hasInternetPermission = context.checkPermission(
+                android.Manifest.permission.INTERNET,
+                Process.myPid(),
+                Process.myUid()) == PackageManager.PERMISSION_GRANTED;
+        synchronized (mAwServiceWorkerSettingsLock) {
+            mHasInternetPermission = hasInternetPermission;
+            mBlockNetworkLoads = !hasInternetPermission;
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#setCacheMode}.
+     */
+    public void setCacheMode(int mode) {
+        if (TRACE) Log.d(LOGTAG, "setCacheMode=" + mode);
+        synchronized (mAwServiceWorkerSettingsLock) {
+            if (mCacheMode != mode) {
+                mCacheMode = mode;
+            }
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#getCacheMode}.
+     */
+    public int getCacheMode() {
+        synchronized (mAwServiceWorkerSettingsLock) {
+            return mCacheMode;
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#setAllowContentAccess}.
+     */
+    public void setAllowContentAccess(boolean allow) {
+        if (TRACE) Log.d(LOGTAG, "setAllowContentAccess=" + allow);
+        synchronized (mAwServiceWorkerSettingsLock) {
+            if (mAllowContentUrlAccess != allow) {
+                mAllowContentUrlAccess = allow;
+            }
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#getAllowContentAccess}.
+     */
+    public boolean getAllowContentAccess() {
+        synchronized (mAwServiceWorkerSettingsLock) {
+            return mAllowContentUrlAccess;
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#setAllowFileAccess}.
+     */
+    public void setAllowFileAccess(boolean allow) {
+        if (TRACE) Log.d(LOGTAG, "setAllowFileAccess=" + allow);
+        synchronized (mAwServiceWorkerSettingsLock) {
+            if (mAllowFileUrlAccess != allow) {
+                mAllowFileUrlAccess = allow;
+            }
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#getAllowFileAccess}.
+     */
+    public boolean getAllowFileAccess() {
+        synchronized (mAwServiceWorkerSettingsLock) {
+            return mAllowFileUrlAccess;
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#setBlockNetworkLoads}.
+     */
+    public void setBlockNetworkLoads(boolean flag) {
+        if (TRACE) Log.d(LOGTAG, "setBlockNetworkLoads=" + flag);
+        synchronized (mAwServiceWorkerSettingsLock) {
+            if (!flag && !mHasInternetPermission) {
+                throw new SecurityException("Permission denied - "
+                        + "application missing INTERNET permission");
+            }
+            mBlockNetworkLoads = flag;
+        }
+    }
+
+    /**
+     * See {@link android.webkit.ServiceWorkerWebSettings#getBlockNetworkLoads}.
+     */
+    public boolean getBlockNetworkLoads() {
+        synchronized (mAwServiceWorkerSettingsLock) {
+            return mBlockNetworkLoads;
+        }
+    }
+}