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/**
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* Copyright 2010-present Facebook.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.facebook.internal;
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import android.content.Context;
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import android.util.Log;
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import com.facebook.LoggingBehavior;
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import java.io.BufferedInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.HttpURLConnection;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.URL;
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class ImageResponseCache {
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static final String TAG = ImageResponseCache.class.getSimpleName();
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private volatile static FileLruCache imageCache;
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synchronized static FileLruCache getCache(Context context) throws IOException{
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if (imageCache == null) {
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imageCache = new FileLruCache(context.getApplicationContext(), TAG, new FileLruCache.Limits());
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}
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return imageCache;
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}
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// Get stream from cache, or return null if the image is not cached.
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// Does not throw if there was an error.
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static InputStream getCachedImageStream(URI url, Context context) {
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InputStream imageStream = null;
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if (url != null) {
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if (isCDNURL(url)) {
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try {
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FileLruCache cache = getCache(context);
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imageStream = cache.get(url.toString());
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} catch (IOException e) {
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Logger.log(LoggingBehavior.CACHE, Log.WARN, TAG, e.toString());
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}
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}
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}
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return imageStream;
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}
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static InputStream interceptAndCacheImageStream(Context context, HttpURLConnection connection) throws IOException {
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InputStream stream = null;
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if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
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URL url = connection.getURL();
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stream = connection.getInputStream(); // Default stream in case caching fails
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try {
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if (isCDNURL(url.toURI())) {
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FileLruCache cache = getCache(context);
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// Wrap stream with a caching stream
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stream = cache.interceptAndPut(
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url.toString(),
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new BufferedHttpInputStream(stream, connection));
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}
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} catch (IOException e) {
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// Caching is best effort
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} catch (URISyntaxException e) {
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// Caching is best effort
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}
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}
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return stream;
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}
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private static boolean isCDNURL(URI url) {
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if (url != null) {
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String uriHost = url.getHost();
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if (uriHost.endsWith("fbcdn.net")) {
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return true;
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}
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if (uriHost.startsWith("fbcdn") && uriHost.endsWith("akamaihd.net")) {
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return true;
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}
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}
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return false;
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}
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static void clearCache(Context context) {
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try {
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getCache(context).clearCache();
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} catch (IOException e) {
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Logger.log(LoggingBehavior.CACHE, Log.WARN, TAG, "clearCache failed " + e.getMessage());
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}
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}
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private static class BufferedHttpInputStream extends BufferedInputStream {
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HttpURLConnection connection;
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BufferedHttpInputStream(InputStream stream, HttpURLConnection connection) {
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super(stream, Utility.DEFAULT_STREAM_BUFFER_SIZE);
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this.connection = connection;
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}
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@Override
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public void close() throws IOException {
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super.close();
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Utility.disconnectQuietly(connection);
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}
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}
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}
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