Mon 21 Jul 22:43:21 CEST 2025
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/*
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Licensed to the Apache Software Foundation (ASF) under one
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or more contributor license agreements. See the NOTICE file
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distributed with this work for additional information
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regarding copyright ownership. The ASF licenses this file
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to you under the Apache License, Version 2.0 (the
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"License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing,
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software distributed under the License is distributed on an
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"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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KIND, either express or implied. See the License for the
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specific language governing permissions and limitations
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under the License.
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*/
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package org.apache.cordova.file;
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import android.content.res.AssetManager;
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import android.net.Uri;
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import android.util.Log;
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import org.apache.cordova.CordovaResourceApi;
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import org.json.JSONArray;
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import org.json.JSONException;
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import org.json.JSONObject;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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import java.io.ObjectInputStream;
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import java.util.HashMap;
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import java.util.Map;
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public class AssetFilesystem extends Filesystem {
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private final AssetManager assetManager;
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// A custom gradle hook creates the cdvasset.manifest file, which speeds up asset listing a tonne.
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// See: http://stackoverflow.com/questions/16911558/android-assetmanager-list-incredibly-slow
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private static Object listCacheLock = new Object();
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private static boolean listCacheFromFile;
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private static Map<String, String[]> listCache;
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private static Map<String, Long> lengthCache;
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private void lazyInitCaches() {
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synchronized (listCacheLock) {
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if (listCache == null) {
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ObjectInputStream ois = null;
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try {
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ois = new ObjectInputStream(assetManager.open("cdvasset.manifest"));
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listCache = (Map<String, String[]>) ois.readObject();
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lengthCache = (Map<String, Long>) ois.readObject();
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listCacheFromFile = true;
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} catch (ClassNotFoundException e) {
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e.printStackTrace();
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} catch (IOException e) {
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// Asset manifest won't exist if the gradle hook isn't set up correctly.
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} finally {
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if (ois != null) {
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try {
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ois.close();
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} catch (IOException e) {
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}
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}
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}
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if (listCache == null) {
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Log.w("AssetFilesystem", "Asset manifest not found. Recursive copies and directory listing will be slow.");
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listCache = new HashMap<String, String[]>();
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}
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}
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}
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}
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private String[] listAssets(String assetPath) throws IOException {
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if (assetPath.startsWith("/")) {
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assetPath = assetPath.substring(1);
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}
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if (assetPath.endsWith("/")) {
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assetPath = assetPath.substring(0, assetPath.length() - 1);
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}
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lazyInitCaches();
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String[] ret = listCache.get(assetPath);
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if (ret == null) {
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if (listCacheFromFile) {
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ret = new String[0];
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} else {
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ret = assetManager.list(assetPath);
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listCache.put(assetPath, ret);
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}
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}
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return ret;
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}
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private long getAssetSize(String assetPath) throws FileNotFoundException {
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if (assetPath.startsWith("/")) {
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assetPath = assetPath.substring(1);
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}
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lazyInitCaches();
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if (lengthCache != null) {
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Long ret = lengthCache.get(assetPath);
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if (ret == null) {
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throw new FileNotFoundException("Asset not found: " + assetPath);
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}
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return ret;
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}
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CordovaResourceApi.OpenForReadResult offr = null;
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try {
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offr = resourceApi.openForRead(nativeUriForFullPath(assetPath));
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long length = offr.length;
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if (length < 0) {
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// available() doesn't always yield the file size, but for assets it does.
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length = offr.inputStream.available();
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}
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return length;
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} catch (IOException e) {
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throw new FileNotFoundException("File not found: " + assetPath);
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} finally {
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if (offr != null) {
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try {
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offr.inputStream.close();
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} catch (IOException e) {
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}
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}
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}
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}
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public AssetFilesystem(AssetManager assetManager, CordovaResourceApi resourceApi) {
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super(Uri.parse("file:///android_asset/"), "assets", resourceApi);
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this.assetManager = assetManager;
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}
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@Override
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public Uri toNativeUri(LocalFilesystemURL inputURL) {
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return nativeUriForFullPath(inputURL.path);
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}
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@Override
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public LocalFilesystemURL toLocalUri(Uri inputURL) {
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if (!"file".equals(inputURL.getScheme())) {
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return null;
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}
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File f = new File(inputURL.getPath());
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// Removes and duplicate /s (e.g. file:///a//b/c)
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Uri resolvedUri = Uri.fromFile(f);
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String rootUriNoTrailingSlash = rootUri.getEncodedPath();
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rootUriNoTrailingSlash = rootUriNoTrailingSlash.substring(0, rootUriNoTrailingSlash.length() - 1);
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if (!resolvedUri.getEncodedPath().startsWith(rootUriNoTrailingSlash)) {
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return null;
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}
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String subPath = resolvedUri.getEncodedPath().substring(rootUriNoTrailingSlash.length());
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// Strip leading slash
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if (!subPath.isEmpty()) {
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subPath = subPath.substring(1);
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}
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Uri.Builder b = new Uri.Builder()
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.scheme(LocalFilesystemURL.FILESYSTEM_PROTOCOL)
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.authority("localhost")
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.path(name);
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if (!subPath.isEmpty()) {
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b.appendEncodedPath(subPath);
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}
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if (isDirectory(subPath) || inputURL.getPath().endsWith("/")) {
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// Add trailing / for directories.
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b.appendEncodedPath("");
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}
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return LocalFilesystemURL.parse(b.build());
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}
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private boolean isDirectory(String assetPath) {
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try {
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return listAssets(assetPath).length != 0;
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} catch (IOException e) {
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return false;
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}
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}
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@Override
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public LocalFilesystemURL[] listChildren(LocalFilesystemURL inputURL) throws FileNotFoundException {
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String pathNoSlashes = inputURL.path.substring(1);
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if (pathNoSlashes.endsWith("/")) {
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pathNoSlashes = pathNoSlashes.substring(0, pathNoSlashes.length() - 1);
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}
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String[] files;
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try {
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files = listAssets(pathNoSlashes);
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} catch (IOException e) {
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throw new FileNotFoundException();
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}
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LocalFilesystemURL[] entries = new LocalFilesystemURL[files.length];
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for (int i = 0; i < files.length; ++i) {
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entries[i] = localUrlforFullPath(new File(inputURL.path, files[i]).getPath());
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}
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return entries;
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}
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@Override
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public JSONObject getFileForLocalURL(LocalFilesystemURL inputURL,
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String path, JSONObject options, boolean directory)
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throws FileExistsException, IOException, TypeMismatchException, EncodingException, JSONException {
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if (options != null && options.optBoolean("create")) {
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throw new UnsupportedOperationException("Assets are read-only");
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}
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// Check whether the supplied path is absolute or relative
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if (directory && !path.endsWith("/")) {
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path += "/";
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}
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LocalFilesystemURL requestedURL;
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if (path.startsWith("/")) {
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requestedURL = localUrlforFullPath(normalizePath(path));
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} else {
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requestedURL = localUrlforFullPath(normalizePath(inputURL.path + "/" + path));
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}
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// Throws a FileNotFoundException if it doesn't exist.
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getFileMetadataForLocalURL(requestedURL);
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boolean isDir = isDirectory(requestedURL.path);
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if (directory && !isDir) {
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throw new TypeMismatchException("path doesn't exist or is file");
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} else if (!directory && isDir) {
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throw new TypeMismatchException("path doesn't exist or is directory");
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}
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// Return the directory
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return makeEntryForURL(requestedURL);
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}
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@Override
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public JSONObject getFileMetadataForLocalURL(LocalFilesystemURL inputURL) throws FileNotFoundException {
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JSONObject metadata = new JSONObject();
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long size = inputURL.isDirectory ? 0 : getAssetSize(inputURL.path);
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try {
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metadata.put("size", size);
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metadata.put("type", inputURL.isDirectory ? "text/directory" : resourceApi.getMimeType(toNativeUri(inputURL)));
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metadata.put("name", new File(inputURL.path).getName());
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metadata.put("fullPath", inputURL.path);
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metadata.put("lastModifiedDate", 0);
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} catch (JSONException e) {
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return null;
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}
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return metadata;
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}
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@Override
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public boolean canRemoveFileAtLocalURL(LocalFilesystemURL inputURL) {
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return false;
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}
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@Override
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long writeToFileAtURL(LocalFilesystemURL inputURL, String data, int offset, boolean isBinary) throws NoModificationAllowedException, IOException {
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throw new NoModificationAllowedException("Assets are read-only");
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}
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@Override
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long truncateFileAtURL(LocalFilesystemURL inputURL, long size) throws IOException, NoModificationAllowedException {
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throw new NoModificationAllowedException("Assets are read-only");
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}
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@Override
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String filesystemPathForURL(LocalFilesystemURL url) {
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return null;
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}
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@Override
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LocalFilesystemURL URLforFilesystemPath(String path) {
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return null;
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}
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@Override
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boolean removeFileAtLocalURL(LocalFilesystemURL inputURL) throws InvalidModificationException, NoModificationAllowedException {
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throw new NoModificationAllowedException("Assets are read-only");
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}
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@Override
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boolean recursiveRemoveFileAtLocalURL(LocalFilesystemURL inputURL) throws NoModificationAllowedException {
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throw new NoModificationAllowedException("Assets are read-only");
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}
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}
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