/// <summary>
/// Returns the given pending change if it should be undone, otherwise null.
/// </summary>
private Task <PendingChange> ShouldUndoPendingChangeAsync(PendingChange pendingChange)
{
return(Task.Run(() =>
{
if (pendingChange.IsAdd || pendingChange.IsDelete || pendingChange.IsLocalItemDelete || pendingChange.IsUndelete)
{
return null;
}
byte[] baseItemHashCode;
try
{
using (var baseFileStream = pendingChange.DownloadBaseFile())
{
using (var hashAlgorithem = new SHA1Cng())
{
baseItemHashCode = hashAlgorithem.ComputeHash(baseFileStream);
}
}
}
catch (Exception ex)
{
const string ErrorMessageFormat = "Error occurred during computing hash for the base item of {0}: {1}";
LoggerUtilities.LogError(string.Format(CultureInfo.CurrentCulture, ErrorMessageFormat, pendingChange.ServerItem, ex.ToString()));
return null;
}
byte[] localItemHashCode;
try
{
using (var localFileStream = new FileStream(Path.GetFullPath(pendingChange.LocalItem), FileMode.Open, FileAccess.Read))
{
using (var hashAlgorithem = new SHA1Cng())
{
localItemHashCode = hashAlgorithem.ComputeHash(localFileStream);
}
}
}
catch (Exception ex)
{
const string ErrorMessageFormat = "Error occurred during computing hash for the local item of {0}: {1}";
LoggerUtilities.LogError(string.Format(CultureInfo.CurrentCulture, ErrorMessageFormat, pendingChange.ServerItem, ex.ToString()));
return null;
}
return Enumerable.SequenceEqual(baseItemHashCode, localItemHashCode) ? pendingChange : null;
}));
}
public static bool HasReallyChange(this PendingChange pendingChange)
{
if (pendingChange.IsAdd || string.IsNullOrEmpty(Path.GetExtension(pendingChange.LocalItem)) || !File.Exists(pendingChange.LocalItem))
{
return(true);
}
string tempFileName = Path.GetTempFileName();
pendingChange.DownloadBaseFile(tempFileName);
var diffOptions = new DiffOptions
{
Flags = DiffOptionFlags.IgnoreWhiteSpace
};
var summary = Common.DiffSummary.DiffFiles(tempFileName, FileType.Detect(tempFileName, FileType.TextFileType), pendingChange.LocalItem, FileType.Detect(pendingChange.LocalItem, FileType.TextFileType), diffOptions);
var res = summary.TotalLinesAdded != 0 || summary.TotalLinesDeleted != 0 || summary.TotalLinesModified != 0;
return(res);
}
/// <summary>
/// Downloads the base file.
/// </summary>
/// <param name="filePathToDownloadFileTo">The file path to download file to.</param>
public void DownloadBaseFile(string filePathToDownloadFileTo)
{
_pendingChange.DownloadBaseFile(filePathToDownloadFileTo);
}
