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/*
* Copyright 2022 Google LLC
*
* 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.google.android.libraries.mobiledatadownload.file.backends;
import android.accounts.Account;
import android.content.Context;
import android.net.Uri;
import android.os.Build;
import android.text.TextUtils;
import com.google.android.libraries.mobiledatadownload.file.common.MalformedUriException;
import java.io.File;
import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
import javax.annotation.Nullable;
/**
* Adapter for converting "android:" URIs into java.io.File. This is considered dangerous since it
* ignores parts of the Uri at the caller's peril, and thus is only available to whitelisted clients
* (mostly internal).
*/
public final class AndroidUriAdapter implements UriAdapter {
private final Context context;
@Nullable private final AccountManager accountManager;
private AndroidUriAdapter(Context context, @Nullable AccountManager accountManager) {
this.context = context;
this.accountManager = accountManager;
}
/** This adapter will fail on "managed" URIs (see {@link forContext(Context, AccountManager)}). */
public static AndroidUriAdapter forContext(Context context) {
return new AndroidUriAdapter(context, /* accountManager= */ null);
}
/** A non-null {@code accountManager} is required to handle "managed" paths. */
public static AndroidUriAdapter forContext(Context context, AccountManager accountManager) {
return new AndroidUriAdapter(context, accountManager);
}
/* @throws MalformedUriException if the uri is not valid. */
public static void validate(Uri uri) throws MalformedUriException {
if (!uri.getScheme().equals(AndroidUri.SCHEME_NAME)) {
throw new MalformedUriException("Scheme must be 'android'");
}
if (uri.getPathSegments().isEmpty()) {
throw new MalformedUriException(
String.format("Path must start with a valid logical location: %s", uri));
}
if (!TextUtils.isEmpty(uri.getQuery())) {
throw new MalformedUriException("Did not expect uri to have query");
}
}
@Override
public File toFile(Uri uri) throws MalformedUriException {
validate(uri);
ArrayList<String> pathSegments = new ArrayList<>(uri.getPathSegments()); // allow modification
File rootLocation;
switch (pathSegments.get(0)) {
case AndroidUri.DIRECT_BOOT_FILES_LOCATION:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
rootLocation = context.createDeviceProtectedStorageContext().getFilesDir();
} else {
throw new MalformedUriException(
String.format(
"Direct boot only exists on N or greater: current SDK %s",
Build.VERSION.SDK_INT));
}
break;
case AndroidUri.DIRECT_BOOT_CACHE_LOCATION:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
rootLocation = context.createDeviceProtectedStorageContext().getCacheDir();
} else {
throw new MalformedUriException(
String.format(
"Direct boot only exists on N or greater: current SDK %s",
Build.VERSION.SDK_INT));
}
break;
case AndroidUri.FILES_LOCATION:
rootLocation = AndroidFileEnvironment.getFilesDirWithPreNWorkaround(context);
break;
case AndroidUri.CACHE_LOCATION:
rootLocation = context.getCacheDir();
break;
case AndroidUri.MANAGED_LOCATION:
File filesDir = AndroidFileEnvironment.getFilesDirWithPreNWorkaround(context);
rootLocation = new File(filesDir, AndroidUri.MANAGED_FILES_DIR_SUBDIRECTORY);
// Transform account segment from logical (plaintext) to physical (integer) representation.
if (pathSegments.size() >= 3) {
Account account;
try {
account = AccountSerialization.deserialize(pathSegments.get(2));
} catch (IllegalArgumentException e) {
throw new MalformedUriException(e);
}
if (!AccountSerialization.isSharedAccount(account)) {
if (accountManager == null) {
throw new MalformedUriException("AccountManager cannot be null");
}
// Blocks on disk IO to read account table.
try {
int accountId = accountManager.getAccountId(account).get();
pathSegments.set(2, Integer.toString(accountId));
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new MalformedUriException(e);
} catch (ExecutionException e) {
// TODO(b/115940396): surface bad account as FileNotFoundException (change signature?)
throw new MalformedUriException(e.getCause());
}
}
}
break;
case AndroidUri.EXTERNAL_LOCATION:
rootLocation = context.getExternalFilesDir(null);
break;
default:
throw new MalformedUriException(
String.format("Path must start with a valid logical location: %s", uri));
}
return new File(
rootLocation, TextUtils.join(File.separator, pathSegments.subList(1, pathSegments.size())));
}
}
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