Merge "Add fallback packages to be enabled iff no webview packages are valid" into nyc-dev

core/java/android/provider/Settings.java

@@ -7047,6 +7047,14 @@ public final class Settings {
         public static final String WEBVIEW_DATA_REDUCTION_PROXY_KEY =
                 "webview_data_reduction_proxy_key";
 
+        /**
+         * Whether or not the WebView fallback mechanism should be enabled.
+         * 0=disabled, 1=enabled.
+         * @hide
+         */
+        public static final String WEBVIEW_FALLBACK_LOGIC_ENABLED =
+                "webview_fallback_logic_enabled";
+
         /**
          * Name of the package used as WebView provider (if unset the provider is instead determined
          * by the system).

core/java/android/webkit/IWebViewUpdateService.aidl

@@ -38,10 +38,14 @@ interface IWebViewUpdateService {
     WebViewProviderResponse waitForAndGetProvider();
 
     /**
-     * DevelopmentSettings uses this to notify WebViewUpdateService that a
-     * new provider has been selected by the user.
+     * DevelopmentSettings uses this to notify WebViewUpdateService that a new provider has been
+     * selected by the user. Returns the provider we end up switching to, this could be different to
+     * the one passed as argument to this method since the Dev Setting calling this method could be
+     * stale. I.e. the Dev setting could be letting the user choose uninstalled/disabled packages,
+     * it would then try to update the provider to such a package while in reality the update
+     * service would switch to another one.
      */
-    void changeProviderAndSetting(String newProvider);
+    String changeProviderAndSetting(String newProvider);
 
     /**
      * DevelopmentSettings uses this to get the current available WebView
@@ -53,4 +57,15 @@ interface IWebViewUpdateService {
      * Used by DevelopmentSetting to get the name of the WebView provider currently in use.
      */
     String getCurrentWebViewPackageName();
+
+    /**
+     * Used by Settings to determine whether a certain package can be enabled/disabled by the user -
+     * the package should not be modifiable in this way if it is a fallback package.
+     */
+    boolean isFallbackPackage(String packageName);
+
+    /**
+     * Enable or disable the WebView package fallback mechanism.
+     */
+    void enableFallbackLogic(boolean enable);
 }

core/java/android/webkit/WebViewFactory.java

@@ -21,6 +21,7 @@ import android.app.ActivityManagerInternal;
 import android.app.AppGlobals;
 import android.app.Application;
 import android.content.Context;
+import android.content.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageInfo;
 import android.content.pm.PackageManager;
@@ -134,6 +135,7 @@ public final class WebViewFactory {
     // Whether or not the provider must be explicitly chosen by the user to be used.
     private static String TAG_AVAILABILITY = "availableByDefault";
     private static String TAG_SIGNATURE = "signature";
+    private static String TAG_FALLBACK = "isFallback";
 
     /**
      * Reads all signatures at the current depth (within the current provider) from the XML parser.
@@ -159,6 +161,7 @@ public final class WebViewFactory {
      * @hide
      * */
     public static WebViewProviderInfo[] getWebViewPackages() {
+        int numFallbackPackages = 0;
         XmlResourceParser parser = null;
         List<WebViewProviderInfo> webViewProviders = new ArrayList<WebViewProviderInfo>();
         try {
@@ -182,13 +185,21 @@ public final class WebViewFactory {
                         throw new MissingWebViewPackageException(
                                 "WebView provider in framework resources missing description");
                     }
-                    String availableByDefault = parser.getAttributeValue(null, TAG_AVAILABILITY);
-                    if (availableByDefault == null) {
-                        availableByDefault = "false";
-                    }
-                    webViewProviders.add(
+                    boolean availableByDefault = "true".equals(
+                            parser.getAttributeValue(null, TAG_AVAILABILITY));
+                    boolean isFallback = "true".equals(
+                            parser.getAttributeValue(null, TAG_FALLBACK));
+                    WebViewProviderInfo currentProvider =
                             new WebViewProviderInfo(packageName, description, availableByDefault,
-                                readSignatures(parser)));
+                                isFallback, readSignatures(parser));
+                    if (currentProvider.isFallbackPackage()) {
+                        numFallbackPackages++;
+                        if (numFallbackPackages > 1) {
+                            throw new AndroidRuntimeException(
+                                    "There can be at most one webview fallback package.");
+                        }
+                    }
+                    webViewProviders.add(currentProvider);
                 }
                 else {
                     Log.e(LOGTAG, "Found an element that is not a webview provider");
@@ -641,6 +652,18 @@ public final class WebViewFactory {
         return result;
     }
 
+    /**
+     * Returns whether the entire package from an ACTION_PACKAGE_CHANGED intent was changed (rather
+     * than just one of its components).
+     * @hide
+     */
+    public static boolean entirePackageChanged(Intent intent) {
+        String[] componentList =
+            intent.getStringArrayExtra(Intent.EXTRA_CHANGED_COMPONENT_NAME_LIST);
+        return Arrays.asList(componentList).contains(
+                intent.getDataString().substring("package:".length()));
+    }
+
     private static IWebViewUpdateService getUpdateService() {
         return IWebViewUpdateService.Stub.asInterface(ServiceManager.getService("webviewupdate"));
     }

core/java/android/webkit/WebViewProviderInfo.java

@@ -40,11 +40,12 @@ public class WebViewProviderInfo implements Parcelable {
         public WebViewPackageNotFoundException(Exception e) { super(e); }
     }
 
-    public WebViewProviderInfo(String packageName, String description, String availableByDefault,
-            String[] signatures) {
+    public WebViewProviderInfo(String packageName, String description, boolean availableByDefault,
+            boolean isFallback, String[] signatures) {
         this.packageName = packageName;
         this.description = description;
-        this.availableByDefault = availableByDefault.equals("true");
+        this.availableByDefault = availableByDefault;
+        this.isFallback = isFallback;
         this.signatures = signatures;
     }
 
@@ -114,6 +115,10 @@ public class WebViewProviderInfo implements Parcelable {
         return availableByDefault;
     }
 
+    public boolean isFallbackPackage() {
+        return isFallback;
+    }
+
     private void updatePackageInfo() {
         try {
             PackageManager pm = AppGlobals.getInitialApplication().getPackageManager();
@@ -165,6 +170,7 @@ public class WebViewProviderInfo implements Parcelable {
     public String packageName;
     public String description;
     private boolean availableByDefault;
+    private boolean isFallback;
 
     private String[] signatures;