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/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.android.browser;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.DownloadManager;
import android.content.Context;
import android.os.Environment;
import android.util.Log;
import android.webkit.MimeTypeMap;
import android.webkit.URLUtil;
import java.io.IOException;
/**
* This class is used to pull down the http headers of a given URL so that
* we can analyse the mimetype and make any correction needed before we give
* the URL to the download manager.
* This operation is needed when the user long-clicks on a link or image and
* we don't know the mimetype. If the user just clicks on the link, we will
* do the same steps of correcting the mimetype down in
* android.os.webkit.LoadListener rather than handling it here.
*
*/
class FetchUrlMimeType extends Thread {
private final static String LOGTAG = "FetchUrlMimeType";
private Context mContext;
private DownloadManager.Request mRequest;
private String mUri;
private String mCookies;
private String mUserAgent;
public FetchUrlMimeType(Context context, DownloadManager.Request request,
String uri, String cookies, String userAgent) {
mContext = context.getApplicationContext();
mRequest = request;
mUri = uri;
mCookies = cookies;
mUserAgent = userAgent;
}
@Override
public void run() {
String mimeType = null;
String contentDisposition = null;
HttpURLConnection connection = null;
try {
URL url = new URL(mUri);
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("HEAD");
if (mUserAgent != null) {
connection.addRequestProperty("User-Agent", mUserAgent);
}
if (mCookies != null && mCookies.length() > 0) {
connection.addRequestProperty("Cookie", mCookies);
}
if (connection.getResponseCode() == 200) {
mimeType = connection.getContentType();
if (mimeType != null) {
final int semicolonIndex = mimeType.indexOf(';');
if (semicolonIndex != -1) {
mimeType = mimeType.substring(0, semicolonIndex);
}
}
contentDisposition = connection.getHeaderField("Content-Disposition");
}
} catch (IOException ioe) {
Log.e(LOGTAG,"Download failed: " + ioe);
} finally {
if (connection != null) {
connection.disconnect();
}
}
if (mimeType != null) {
if (mimeType.equalsIgnoreCase("text/plain") ||
mimeType.equalsIgnoreCase("application/octet-stream")) {
String newMimeType =
MimeTypeMap.getSingleton().getMimeTypeFromExtension(
MimeTypeMap.getFileExtensionFromUrl(mUri));
if (newMimeType != null) {
mimeType = newMimeType;
mRequest.setMimeType(newMimeType);
}
}
String filename = URLUtil.guessFileName(mUri, contentDisposition,
mimeType);
mRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, filename);
}
// Start the download
DownloadManager manager = (DownloadManager) mContext.getSystemService(
Context.DOWNLOAD_SERVICE);
manager.enqueue(mRequest);
}
}
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