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package it.niedermann.nextcloud.deck.util;
import android.content.Context;
import android.net.Uri;
import androidx.annotation.NonNull;
import androidx.annotation.WorkerThread;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import it.niedermann.nextcloud.deck.DeckLog;
/**
* Created by stefan on 07.03.20.
*/
public class FilesUtil {
private FilesUtil() {
throw new UnsupportedOperationException("This class must not get instantiated");
}
/**
* https://help.nextcloud.com/t/android-app-select-file-with-nextcloud-app-file-cant-be-read/103706
* Must not be called from the UI thread because the {@param currentUri} might refer to a not yet locally available file.
*/
@WorkerThread
public static File copyContentUriToTempFile(@NonNull Context context, @NonNull Uri currentUri, long accountId, Long localCardId) throws IOException, IllegalArgumentException {
final var inputStream = context.getContentResolver().openInputStream(currentUri);
if (inputStream == null) {
throw new IOException("Could not open input stream for " + currentUri.getPath());
}
final var cacheFile = getTempCacheFile(context, "attachments/account-" + accountId + "/card-" + (localCardId == null ? "pending-creation" : localCardId) + '/' + UriUtils.getDisplayNameForUri(currentUri, context));
final var outputStream = new FileOutputStream(cacheFile);
byte[] buffer = new byte[4096];
int count;
while ((count = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, count);
}
DeckLog.verbose("----- wrote");
return cacheFile;
}
/**
* Creates a temporary cache directory in a synchronized manner, in order to mitigate multi-threaded collisions
* @param tempDir - Temporal Cache Directory
* @return success
*/
static synchronized boolean createTempCacheDirectory(@NonNull File tempDir) {
if (tempDir.exists()) {
return true;
}
return tempDir.mkdirs();
}
/**
* Creates a new {@link File}
*/
public static File getTempCacheFile(@NonNull Context context, String fileName) throws IOException {
final var cacheFile = new File(context.getApplicationContext().getFilesDir().getAbsolutePath() + "/" + fileName);
DeckLog.verbose("- Full path for new cache file:", cacheFile.getAbsolutePath());
final var tempDir = cacheFile.getParentFile();
if (tempDir == null) {
throw new FileNotFoundException("could not cacheFile.getParentFile()");
}
if (!tempDir.exists()) {
DeckLog.verbose("-- The folder in which the new file should be created does not exist yet. Trying to create it…");
if (createTempCacheDirectory(tempDir)) {
DeckLog.verbose("--- Creation successful");
} else {
throw new IOException("Directory for temporary file does not exist and could not be created.");
}
}
if (cacheFile.exists()){
DeckLog.verbose("- File already exists, try to delete the existing one");
if (cacheFile.delete()){
DeckLog.verbose("- Deleted successfully");
} else {
throw new IOException("Could not delete existing cache file.");
}
}
DeckLog.verbose("- Try to create actual cache file");
if (cacheFile.createNewFile()) {
DeckLog.verbose("-- Successfully created cache file");
} else {
throw new IOException("Failed to create cacheFile");
}
return cacheFile;
}
}
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