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Commit 3a6027c0 authored by Abhijeet Kaur's avatar Abhijeet Kaur
Browse files

Use compat flags to reflect the current status of legacy storage. 

Scoped Storage status of an app can be changed by using compat flags,
as apps can chose to opt-in/opt out of Scoped Storage using these flags.
See ag/10406320 for more details.

Update documentation of isExternalStorageLegacy() method.

Remove checks around INSTALL_PACKAGES and OP_REQUEST_INSTALL_PACKAGES as
that does not allow legacy external storage.

Remove check for WRITE_MEDIA_STORAGE as its value is now
reflected by OP_LEGACY_STORAGE (ag/10162772)

Bug: 132649864
Test: atest ExternalStorageHostTest
Test: atest com.android.providers.media
Test: manually using StorageTest app
Merged-In: Id53da8f8783455038bad101e6ac50ba66b595012
Change-Id: Id53da8f8783455038bad101e6ac50ba66b595012
(cherry picked from commit f8af8204)
parent a8375cc9

core/java/android/os/Environment.java

+42 −20
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ import android.annotation.TestApi; 
import android.app.AppGlobals;

import android.app.AppOpsManager;

import android.app.admin.DevicePolicyManager;

import android.compat.Compatibility;

import android.compat.annotation.UnsupportedAppUsage;

import android.content.Context;

import android.content.Intent;
@@ -88,6 +89,16 @@ public class Environment { 
    private static final File DIR_APEX_ROOT = getDirectory(ENV_APEX_ROOT,

            "/apex");



    /**

     * See definition in com.android.providers.media.LocalCallingIdentity

     */

    private static final long DEFAULT_SCOPED_STORAGE = 149924527L;



    /**

     * See definition in com.android.providers.media.LocalCallingIdentity

     */

    private static final long FORCE_ENABLE_SCOPED_STORAGE = 132649864L;



    @UnsupportedAppUsage

    private static UserEnvironment sCurrentUser;

    private static boolean sUserRequired;
@@ -1191,12 +1202,13 @@ public class Environment { 
    }



    /**

     * Returns whether the primary shared/external storage media is a legacy

     * view that includes files not owned by the app.

     * Returns whether the shared/external storage media is a

     * legacy view that includes files not owned by the app.

     * <p>

     * This value may be different from the value requested by

     * {@code requestLegacyExternalStorage} in the app's manifest, since an app

     * may inherit its legacy state based on when it was first installed.

     * may inherit its legacy state based on when it was first installed, target sdk and other

     * factors.

     * <p>

     * Non-legacy apps can continue to discover and read media belonging to

     * other apps via {@link android.provider.MediaStore}.
@@ -1207,12 +1219,13 @@ public class Environment { 
    }



    /**

     * Returns whether the shared/external storage media at the given path is a

     * Returns whether the shared/external storage media is a

     * legacy view that includes files not owned by the app.

     * <p>

     * This value may be different from the value requested by

     * {@code requestLegacyExternalStorage} in the app's manifest, since an app

     * may inherit its legacy state based on when it was first installed.

     * may inherit its legacy state based on when it was first installed, target sdk and other

     * factors.

     * <p>

     * Non-legacy apps can continue to discover and read media belonging to

     * other apps via {@link android.provider.MediaStore}.
@@ -1232,24 +1245,23 @@ public class Environment { 
            return false;

        }



        if (packageManager.checkPermission(Manifest.permission.WRITE_MEDIA_STORAGE,

                context.getPackageName()) == PackageManager.PERMISSION_GRANTED) {

            return true;

        }



        if (packageManager.checkPermission(Manifest.permission.INSTALL_PACKAGES,

                context.getPackageName()) == PackageManager.PERMISSION_GRANTED) {

            return true;

        // TODO(b/150672994): Compat flags do not override instant app and isolated process's

        //  behavior.

        boolean defaultScopedStorage = Compatibility.isChangeEnabled(DEFAULT_SCOPED_STORAGE);

        boolean forceEnableScopedStorage = Compatibility.isChangeEnabled(

                FORCE_ENABLE_SCOPED_STORAGE);

        // if Scoped Storage is strictly enforced, the app does *not* have legacy storage access

        // Note: does not require packagename/uid as this is directly called from an app process

        if (isScopedStorageEnforced(defaultScopedStorage, forceEnableScopedStorage)) {

            return false;

        }

        final AppOpsManager appOps = context.getSystemService(AppOpsManager.class);

        final String[] packagesForUid = packageManager.getPackagesForUid(uid);

        for (String packageName : packagesForUid) {

            if (appOps.checkOpNoThrow(AppOpsManager.OP_REQUEST_INSTALL_PACKAGES,

                    uid, packageName) == AppOpsManager.MODE_ALLOWED) {

        // if Scoped Storage is strictly disabled, the app has legacy storage access

        // Note: does not require packagename/uid as this is directly called from an app process

        if (isScopedStorageDisabled(defaultScopedStorage, forceEnableScopedStorage)) {

            return true;

        }

        }



        final AppOpsManager appOps = context.getSystemService(AppOpsManager.class);

        return appOps.checkOpNoThrow(AppOpsManager.OP_LEGACY_STORAGE,

                uid, context.getOpPackageName()) == AppOpsManager.MODE_ALLOWED;

    }
@@ -1298,6 +1310,16 @@ public class Environment { 
        }

    }



    private static boolean isScopedStorageEnforced(boolean defaultScopedStorage,

            boolean forceEnableScopedStorage) {

        return defaultScopedStorage && forceEnableScopedStorage;

    }



    private static boolean isScopedStorageDisabled(boolean defaultScopedStorage,

            boolean forceEnableScopedStorage) {

        return !defaultScopedStorage && !forceEnableScopedStorage;

    }



    static File getDirectory(String variableName, String defaultPath) {

        String path = System.getenv(variableName);

        return path == null ? new File(defaultPath) : new File(path);