public override async Task <bool> FileExists(string filename)
{
var exists = false;
using (var process = CreateSUProcess())
using (var input = new DataInputStream(process.InputStream))
using (var output = new DataOutputStream(process.OutputStream))
{
await output.WriteBytesAsync($"[ -f \"{filename}\" ] && echo 1 || echo 0\n");
await output.FlushAsync();
await output.WriteBytesAsync("exit\n");
await output.FlushAsync();
var res = await input.ReadLineAsync();
exists = res == "1";
await process.WaitForAsync();
}
return(exists);
}
public override async Task <bool> CheckDeviceRooted()
{
try
{
using (var process = CreateSUProcess())
using (var input = new DataInputStream(process.InputStream))
using (var output = new DataOutputStream(process.OutputStream))
{
await output.WriteBytesAsync("id\n");
await output.FlushAsync();
var id = await input.ReadLineAsync();
var res = id != null && id.Contains("uid=0");
await output.WriteBytesAsync("exit\n");
await output.FlushAsync();
await process.WaitForAsync();
return(res);
}
}
catch
{
return(false);
}
}
private async Task DoBackup(Uri uri, string password)
{
var backup = new Backup(
_authSource.GetAll(),
_categorySource.GetAll(),
_authSource.CategoryBindings,
_customIconSource.GetAll()
);
var dataToWrite = backup.ToBytes(password);
// This is the only way of reliably writing files using SAF on Xamarin.
// A file output stream will usually create 0 byte files on virtual storage such as Google Drive
var output = ContentResolver.OpenOutputStream(uri, "rwt");
var dataStream = new DataOutputStream(output);
try
{
await dataStream.WriteAsync(dataToWrite);
await dataStream.FlushAsync();
}
finally
{
dataStream.Close();
output.Close();
}
}
public override async Task ExecuteRootCommand(string cmd)
{
using (var process = CreateSUProcess())
using (var output = new DataOutputStream(process.OutputStream))
{
await output.WriteBytesAsync(cmd + "\n");
await output.FlushAsync();
await output.WriteBytesAsync("exit\n");
await output.FlushAsync();
await process.WaitForAsync();
}
}
public static async Task WriteFile(Context context, Uri uri, byte[] data)
{
// Run backup on separate thread, file writing on the main thread fails when using Nextcloud
await Task.Run(async delegate
{
// This is the only way of reliably writing binary files using SAF on Xamarin.
// A file output stream will usually create 0 byte files on virtual storage such as Google Drive
Stream output = null;
DataOutputStream dataStream = null;
try
{
output = context.ContentResolver.OpenOutputStream(uri);
dataStream = new DataOutputStream(output);
await dataStream.WriteAsync(data);
await dataStream.FlushAsync();
}
finally
{
dataStream?.Close();
output?.Close();
}
});
}
public override async Task <Stream> OpenFile(string filename)
{
Stream outStream = null;
using (var process = CreateSUProcess())
using (var input = new DataInputStream(process.InputStream))
using (var output = new DataOutputStream(process.OutputStream))
{
await output.WriteBytesAsync($"[ -f \"{filename}\" ] && echo 1 || echo 0\n");
await output.FlushAsync();
var exists = await input.ReadLineAsync();
if (exists == "1")
{
var tempDirectory = Path.Combine(Android.OS.Environment.ExternalStorageDirectory.AbsolutePath, "Android", "data", AppInfo.PackageName, "cache");
var outputFile = Path.Combine(tempDirectory, Path.GetFileName(filename));
if (!Directory.Exists(tempDirectory))
{
Directory.CreateDirectory(tempDirectory);
}
await output.WriteBytesAsync($"cp {filename} {outputFile}\n");
await output.FlushAsync();
outStream = new FileInfo(outputFile).Open(FileMode.Open);
}
await output.WriteBytesAsync("exit\n");
await output.FlushAsync();
await process.WaitForAsync();
}
return(outStream);
}