package de.danoeh.antennapodsp.storage;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
import android.webkit.URLUtil;
import de.danoeh.antennapodsp.AppConfig;
import de.danoeh.antennapodsp.feed.*;
import de.danoeh.antennapodsp.preferences.UserPreferences;
import de.danoeh.antennapodsp.service.download.DownloadRequest;
import de.danoeh.antennapodsp.service.download.DownloadService;
import de.danoeh.antennapodsp.util.FileNameGenerator;
import de.danoeh.antennapodsp.util.URLChecker;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.StringUtils;
import java.io.File;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
public class DownloadRequester {
private static final String TAG = "DownloadRequester";
public static final String IMAGE_DOWNLOADPATH = "images/";
public static final String FEED_DOWNLOADPATH = "cache/";
public static final String MEDIA_DOWNLOADPATH = "media/";
private static DownloadRequester downloader;
Map<String, DownloadRequest> downloads;
private DownloadRequester() {
downloads = new ConcurrentHashMap<String, DownloadRequest>();
}
public static synchronized DownloadRequester getInstance() {
if (downloader == null) {
downloader = new DownloadRequester();
}
return downloader;
}
private void download(Context context, FeedFile item, File dest,
boolean overwriteIfExists) {
if (!isDownloadingFile(item)) {
if (!isFilenameAvailable(dest.toString()) || dest.exists()) {
if (AppConfig.DEBUG)
Log.d(TAG, "Filename already used.");
if (isFilenameAvailable(dest.toString()) && overwriteIfExists) {
boolean result = dest.delete();
if (AppConfig.DEBUG)
Log.d(TAG, "Deleting file. Result: " + result);
} else {
// find different name
File newDest = null;
for (int i = 1; i < Integer.MAX_VALUE; i++) {
String newName = FilenameUtils.getBaseName(dest
.getName())
+ "-"
+ i
+ FilenameUtils.EXTENSION_SEPARATOR
+ FilenameUtils.getExtension(dest.getName());
if (AppConfig.DEBUG)
Log.d(TAG, "Testing filename " + newName);
newDest = new File(dest.getParent(), newName);
if (!newDest.exists()
&& isFilenameAvailable(newDest.toString())) {
if (AppConfig.DEBUG)
Log.d(TAG, "File doesn't exist yet. Using "
+ newName);
break;
}
}
if (newDest != null) {
dest = newDest;
}
}
}
if (AppConfig.DEBUG)
Log.d(TAG,
"Requesting download of url " + item.getDownload_url());
item.setDownload_url(URLChecker.prepareURL(item.getDownload_url()));
DownloadRequest request = new DownloadRequest(dest.toString(),
item.getDownload_url(), item.getHumanReadableIdentifier(),
item.getId(), item.getTypeAsInt());
downloads.put(request.getSource(), request);
Intent launchIntent = new Intent(context, DownloadService.class);
launchIntent.putExtra(DownloadService.EXTRA_REQUEST, request);
context.startService(launchIntent);
EventDistributor.getInstance().sendDownloadQueuedBroadcast();
} else {
Log.e(TAG, "URL " + item.getDownload_url()
+ " is already being downloaded");
}
}
/**
* Returns true if a filename is available and false if it has already been
* taken by another requested download.
*/
private boolean isFilenameAvailable(String path) {
for (String key : downloads.keySet()) {
DownloadRequest r = downloads.get(key);
if (StringUtils.equals(r.getDestination(), path)) {
if (AppConfig.DEBUG)
Log.d(TAG, path
+ " is already used by another requested download");
return false;
}
}
if (AppConfig.DEBUG)
Log.d(TAG, path + " is available as a download destination");
return true;
}
public void downloadFeed(Context context, Feed feed)
throws DownloadRequestException {
if (feedFileValid(feed)) {
download(context, feed, new File(getFeedfilePath(context),
getFeedfileName(feed)), true);
}
}
public void downloadImage(Context context, FeedImage image)
throws DownloadRequestException {
if (feedFileValid(image)) {
download(context, image, new File(getImagefilePath(context),
getImagefileName(image)), true);
}
}
public void downloadMedia(Context context, FeedMedia feedmedia)
throws DownloadRequestException {
if (feedFileValid(feedmedia)) {
download(context, feedmedia,
new File(getMediafilePath(context, feedmedia),
getMediafilename(feedmedia)), false);
}
}
/**
* Throws a DownloadRequestException if the feedfile or the download url of
* the feedfile is null.
*
* @throws DownloadRequestException
*/
private boolean feedFileValid(FeedFile f) throws DownloadRequestException {
if (f == null) {
throw new DownloadRequestException("Feedfile was null");
} else if (f.getDownload_url() == null) {
throw new DownloadRequestException("File has no download URL");
} else {
return true;
}
}
/**
* Cancels a running download.
*/
public void cancelDownload(final Context context, final FeedFile f) {
cancelDownload(context, f.getDownload_url());
}
/**
* Cancels a running download.
*/
public void cancelDownload(final Context context, final String downloadUrl) {
if (AppConfig.DEBUG)
Log.d(TAG, "Cancelling download with url " + downloadUrl);
Intent cancelIntent = new Intent(DownloadService.ACTION_CANCEL_DOWNLOAD);
cancelIntent.putExtra(DownloadService.EXTRA_DOWNLOAD_URL, downloadUrl);
context.sendBroadcast(cancelIntent);
}
/**
* Cancels all running downloads
*/
public void cancelAllDownloads(Context context) {
if (AppConfig.DEBUG)
Log.d(TAG, "Cancelling all running downloads");
context.sendBroadcast(new Intent(
DownloadService.ACTION_CANCEL_ALL_DOWNLOADS));
}
/**
* Returns true if there is at least one Feed in the downloads queue.
*/
public boolean isDownloadingFeeds() {
for (DownloadRequest r : downloads.values()) {
if (r.getFeedfileType() == Feed.FEEDFILETYPE_FEED) {
return true;
}
}
return false;
}
/**
* Checks if feedfile is in the downloads list
*/
public boolean isDownloadingFile(FeedFile item) {
if (item.getDownload_url() != null) {
return downloads.containsKey(item.getDownload_url());
}
return false;
}
public DownloadRequest getDownload(String downloadUrl) {
return downloads.get(downloadUrl);
}
/**
* Checks if feedfile with the given download url is in the downloads list
*/
public boolean isDownloadingFile(String downloadUrl) {
return downloads.get(downloadUrl) != null;
}
public boolean hasNoDownloads() {
return downloads.isEmpty();
}
/**
* Remove an object from the downloads-list of the requester.
*/
public void removeDownload(DownloadRequest r) {
if (downloads.remove(r.getSource()) == null) {
Log.e(TAG,
"Could not remove object with url " + r.getSource());
}
}
/**
* Get the number of uncompleted Downloads
*/
public int getNumberOfDownloads() {
return downloads.size();
}
public String getFeedfilePath(Context context)
throws DownloadRequestException {
return getExternalFilesDirOrThrowException(context, FEED_DOWNLOADPATH)
.toString() + "/";
}
public String getFeedfileName(Feed feed) {
String filename = feed.getDownload_url();
if (feed.getTitle() != null && !feed.getTitle().isEmpty()) {
filename = feed.getTitle();
}
return "feed-" + FileNameGenerator.generateFileName(filename);
}
public String getImagefilePath(Context context)
throws DownloadRequestException {
return getExternalFilesDirOrThrowException(context, IMAGE_DOWNLOADPATH)
.toString() + "/";
}
public String getImagefileName(FeedImage image) {
String filename = image.getDownload_url();
if (image.getOwner() != null && image.getOwner().getHumanReadableIdentifier() != null) {
filename = image.getOwner().getHumanReadableIdentifier();
}
return "image-" + FileNameGenerator.generateFileName(filename);
}
public String getMediafilePath(Context context, FeedMedia media)
throws DownloadRequestException {
File externalStorage = getExternalFilesDirOrThrowException(
context,
MEDIA_DOWNLOADPATH
+ FileNameGenerator.generateFileName(media.getItem()
.getFeed().getTitle()) + "/");
return externalStorage.toString();
}
private File getExternalFilesDirOrThrowException(Context context,
String type) throws DownloadRequestException {
File result = UserPreferences.getDataFolder(context, type);
if (result == null) {
throw new DownloadRequestException(
"Failed to access external storage");
}
return result;
}
public String getMediafilename(FeedMedia media) {
String filename;
String titleBaseFilename = "";
// Try to generate the filename by the item title
if (media.getItem() != null && media.getItem().getTitle() != null) {
String title = media.getItem().getTitle();
// Delete reserved characters
titleBaseFilename = title.replaceAll("[\\\\/%\\?\\*:|<>\"\\p{Cntrl}]", "");
titleBaseFilename = titleBaseFilename.trim();
}
String URLBaseFilename = URLUtil.guessFileName(media.getDownload_url(),
null, media.getMime_type());
;
if (titleBaseFilename != "") {
// Append extension
filename = titleBaseFilename + FilenameUtils.EXTENSION_SEPARATOR +
FilenameUtils.getExtension(URLBaseFilename);
} else {
// Fall back on URL file name
filename = URLBaseFilename;
}
return filename;
}
}