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/**
* Copyright 2010-present Facebook.
*
* 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.facebook.internal;
import android.content.Context;
import android.util.Log;
import com.facebook.LoggingBehavior;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.URI;
import java.net.URISyntaxException;
class UrlRedirectCache {
static final String TAG = UrlRedirectCache.class.getSimpleName();
private static final String REDIRECT_CONTENT_TAG = TAG + "_Redirect";
private volatile static FileLruCache urlRedirectCache;
synchronized static FileLruCache getCache(Context context) throws IOException{
if (urlRedirectCache == null) {
urlRedirectCache = new FileLruCache(context.getApplicationContext(), TAG, new FileLruCache.Limits());
}
return urlRedirectCache;
}
static URI getRedirectedUri(Context context, URI uri) {
if (uri == null) {
return null;
}
String uriString = uri.toString();
InputStreamReader reader = null;
try {
InputStream stream;
FileLruCache cache = getCache(context);
boolean redirectExists = false;
while ((stream = cache.get(uriString, REDIRECT_CONTENT_TAG)) != null) {
redirectExists = true;
// Get the redirected url
reader = new InputStreamReader(stream);
char[] buffer = new char[128];
int bufferLength;
StringBuilder urlBuilder = new StringBuilder();
while ((bufferLength = reader.read(buffer, 0, buffer.length)) > 0) {
urlBuilder.append(buffer, 0, bufferLength);
}
Utility.closeQuietly(reader);
// Iterate to the next url in the redirection
uriString = urlBuilder.toString();
}
if (redirectExists) {
return new URI(uriString);
}
} catch (URISyntaxException e) {
// caching is best effort, so ignore the exception
} catch (IOException ioe) {
} finally {
Utility.closeQuietly(reader);
}
return null;
}
static void cacheUriRedirect(Context context, URI fromUri, URI toUri) {
if (fromUri == null || toUri == null) {
return;
}
OutputStream redirectStream = null;
try {
FileLruCache cache = getCache(context);
redirectStream = cache.openPutStream(fromUri.toString(), REDIRECT_CONTENT_TAG);
redirectStream.write(toUri.toString().getBytes());
} catch (IOException e) {
// Caching is best effort
} finally {
Utility.closeQuietly(redirectStream);
}
}
static void clearCache(Context context) {
try {
getCache(context).clearCache();
} catch (IOException e) {
Logger.log(LoggingBehavior.CACHE, Log.WARN, TAG, "clearCache failed " + e.getMessage());
}
}
}
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