/// <summary>
/// Perform backup on the specified media
/// </summary>
public void Backup(BackupMedia media, String password = null)
{
// Make a determination that the user is allowed to perform this action
if (AuthenticationContext.Current.Principal != AuthenticationContext.SystemPrincipal)
{
new PolicyPermission(System.Security.Permissions.PermissionState.Unrestricted, PolicyIdentifiers.ExportClinicalData).Demand();
}
// Get the output medium
var directoryName = this.GetBackupDirectory(media);
string fileName = Path.Combine(directoryName, $"oizdc-{DateTime.Now.ToString("yyyyMMddHHmm")}.oiz.tar");
// Confirm if the user really really wants to backup
if (String.IsNullOrEmpty(password) &&
!ApplicationContext.Current.Confirm(Strings.locale_backup_confirm))
{
return;
}
// TODO: Audit the backup to the data to the central server
AuditUtil.AuditDataExport();
// Try to backup the data
try
{
this.m_tracer.TraceInfo("Beginning backup to {0}..", fileName);
ApplicationContext.Current?.SetProgress(Strings.locale_backup, 0.25f);
// Backup folders first
var sourceDirectory = XamarinApplicationContext.Current.ConfigurationManager.ApplicationDataDirectory;
using (var fs = File.Create(fileName))
using (var writer = new SharpCompress.Writers.Tar.TarWriter(fs, new SharpCompress.Writers.WriterOptions(SharpCompress.Common.CompressionType.None)))
{
this.BackupDirectory(writer, sourceDirectory, sourceDirectory);
var appInfo = new ApplicationInfo(false).ToDiagnosticReport();
// Output appInfo
using (var ms = new MemoryStream()) {
XmlSerializer xsz = new XmlSerializer(appInfo.GetType());
xsz.Serialize(ms, appInfo);
ms.Flush();
ms.Seek(0, SeekOrigin.Begin);
writer.Write(".appinfo.xml", ms, DateTime.Now);
}
// Output declaration statement
using (var ms = new MemoryStream(Encoding.UTF8.GetBytes($"User {(AuthenticationContext.Current?.Principal?.Identity?.Name ?? "SYSTEM")} created this backup on {DateTime.Now}. The end user was asked to confirm this decision to backup and acknolwedges all responsibilities for guarding this file.")))
writer.Write("DISCLAIMER.TXT", ms, DateTime.Now);
}
this.m_tracer.TraceInfo("Beginning compression {0}..", fileName);
using (var fs = File.OpenRead(fileName))
using (var gzs = new GZipStream(File.Create(fileName + ".gz"), CompressionMode.Compress))
{
int br = 4096;
byte[] buffer = new byte[br];
while (br == 4096)
{
br = fs.Read(buffer, 0, 4096);
gzs.Write(buffer, 0, br);
ApplicationContext.Current?.SetProgress(Strings.locale_backup_compressing, (float)fs.Position / (float)fs.Length * 0.5f + 0.5f);
}
}
File.Delete(fileName);
}
catch (Exception ex)
{
this.m_tracer.TraceError("Error backing up to {0}: {1}", fileName, ex);
throw;
}
}