/// <summary>
/// Generates a diff of two mod manifests.
/// </summary>
/// <param name="newManifest">The new manifest.</param>
/// <param name="oldManifest">The old manifest.</param>
/// <returns>A list of <see cref="ModManifestDiff"/> containing change information.</returns>
public static List <ModManifestDiff> Diff(List <ModManifestEntry> newManifest, List <ModManifestEntry> oldManifest)
{
// TODO: handle copies instead of moves to reduce download requirements (or cache downloads by hash?)
var result = new List <ModManifestDiff>();
List <ModManifestEntry> old = oldManifest != null && oldManifest.Count > 0
? new List <ModManifestEntry>(oldManifest)
: new List <ModManifestEntry>();
foreach (ModManifestEntry entry in newManifest)
{
// First, check for an exact match. File path/name, hash, size; everything.
ModManifestEntry exact = old.FirstOrDefault(x => Equals(x, entry));
if (exact != null)
{
old.Remove(exact);
result.Add(new ModManifestDiff(ModManifestState.Unchanged, entry, null));
continue;
}
// There's no exact match, so let's search by checksum.
List <ModManifestEntry> checksum = old.Where(x => x.Checksum.Equals(entry.Checksum, StringComparison.InvariantCultureIgnoreCase)).ToList();
// If we've found matching checksums, we then need to check
// the file path to see if it's been moved.
if (checksum.Count > 0)
{
old.Remove(checksum[0]);
if (checksum.All(x => x.FilePath != entry.FilePath))
{
old.Remove(old.FirstOrDefault(x => x.FilePath.Equals(entry.FilePath, StringComparison.InvariantCultureIgnoreCase)));
result.Add(new ModManifestDiff(ModManifestState.Moved, entry, checksum[0]));
continue;
}
}
// If we've made it here, there's no matching checksums, so let's search
// for matching paths. If a path matches, the file has been modified.
ModManifestEntry nameMatch = old.FirstOrDefault(x => x.FilePath.Equals(entry.FilePath, StringComparison.InvariantCultureIgnoreCase));
if (nameMatch != null)
{
old.Remove(nameMatch);
result.Add(new ModManifestDiff(ModManifestState.Changed, entry, nameMatch));
continue;
}
// In every other case, this file is newly added.
result.Add(new ModManifestDiff(ModManifestState.Added, entry, null));
}
// All files that are still unique to the old manifest should be marked for removal.
if (old.Count > 0)
{
result.AddRange(old.Select(x => new ModManifestDiff(ModManifestState.Removed, x, null)));
}
return(result);
}
public ModManifestDiff(ModManifestState state, ModManifestEntry current, ModManifestEntry last)
{
State = state;
Current = current;
Last = last;
}
/// <summary>
/// Downloads files required for updating according to <see cref="Type"/>.
/// </summary>
/// <param name="client"><see cref="WebClient"/> to be used for downloading.</param>
/// <param name="updatePath">Path to store downloaded files.</param>
public void Download(WebClient client, string updatePath)
{
var cancelArgs = new CancelEventArgs(false);
DownloadProgressEventArgs downloadArgs = null;
int fileDownloading = 0;
void downloadComplete(object sender, AsyncCompletedEventArgs args)
{
lock (args.UserState)
{
Monitor.Pulse(args.UserState);
}
}
void downloadProgressChanged(object sender, DownloadProgressChangedEventArgs args)
{
downloadArgs = new DownloadProgressEventArgs(args, fileDownloading, FilesToDownload);
if (OnDownloadProgress(downloadArgs))
{
((WebClient)sender).CancelAsync();
}
}
switch (Type)
{
case ModDownloadType.Archive:
{
var uri = new Uri(Url);
if (!uri.Host.EndsWith("github.com", StringComparison.OrdinalIgnoreCase))
{
var request = (HttpWebRequest)WebRequest.Create(uri);
request.Method = "HEAD";
var response = (HttpWebResponse)request.GetResponse();
uri = response.ResponseUri;
response.Close();
}
string filePath = Path.Combine(updatePath, uri.Segments.Last());
var info = new FileInfo(filePath);
if (info.Exists && info.Length == Size)
{
if (OnDownloadCompleted(cancelArgs))
{
return;
}
}
else
{
if (OnDownloadStarted(cancelArgs))
{
return;
}
client.DownloadFileCompleted += downloadComplete;
client.DownloadProgressChanged += downloadProgressChanged;
++fileDownloading;
var sync = new object();
lock (sync)
{
client.DownloadFileAsync(uri, filePath, sync);
Monitor.Wait(sync);
}
client.DownloadProgressChanged -= downloadProgressChanged;
client.DownloadFileCompleted -= downloadComplete;
if (cancelArgs.Cancel || downloadArgs?.Cancel == true)
{
return;
}
if (OnDownloadCompleted(cancelArgs))
{
return;
}
}
string dataDir = Path.Combine(updatePath, Path.GetFileNameWithoutExtension(filePath));
if (!Directory.Exists(dataDir))
{
Directory.CreateDirectory(dataDir);
}
if (OnExtracting(cancelArgs))
{
return;
}
Process process = Process.Start(
new ProcessStartInfo("7z.exe", $"x -aoa -o\"{dataDir}\" \"{filePath}\"")
{
UseShellExecute = false,
CreateNoWindow = true
});
if (process != null)
{
process.WaitForExit();
}
else
{
throw new NullReferenceException("Failed to create 7z process");
}
string workDir = Path.GetDirectoryName(ModInfo.GetModFiles(new DirectoryInfo(dataDir)).FirstOrDefault());
if (string.IsNullOrEmpty(workDir))
{
throw new DirectoryNotFoundException($"Unable to locate mod.ini in \"{dataDir}\"");
}
string newManPath = Path.Combine(workDir, "mod.manifest");
string oldManPath = Path.Combine(Folder, "mod.manifest");
if (OnParsingManifest(cancelArgs))
{
return;
}
if (!File.Exists(newManPath) || !File.Exists(oldManPath))
{
CopyDirectory(new DirectoryInfo(workDir), Directory.CreateDirectory(Folder));
Directory.Delete(dataDir, true);
if (File.Exists(filePath))
{
File.Delete(filePath);
}
return;
}
if (OnParsingManifest(cancelArgs))
{
return;
}
List<ModManifestEntry> newManifest = ModManifest.FromFile(newManPath);
if (OnApplyingManifest(cancelArgs))
{
return;
}
List<ModManifestEntry> oldManifest = ModManifest.FromFile(oldManPath);
List<string> oldFiles = oldManifest.Except(newManifest)
.Select(x => Path.Combine(Folder, x.FilePath))
.ToList();
foreach (string file in oldFiles)
{
if (File.Exists(file))
{
File.Delete(file);
}
}
RemoveEmptyDirectories(oldManifest, newManifest);
foreach (ModManifestEntry file in newManifest)
{
string dir = Path.GetDirectoryName(file.FilePath);
if (!string.IsNullOrEmpty(dir))
{
string newDir = Path.Combine(Folder, dir);
if (!Directory.Exists(newDir))
{
Directory.CreateDirectory(newDir);
}
}
string dest = Path.Combine(Folder, file.FilePath);
if (File.Exists(dest))
{
File.Delete(dest);
}
File.Move(Path.Combine(workDir, file.FilePath), dest);
}
File.Copy(newManPath, oldManPath, true);
Directory.Delete(dataDir, true);
File.WriteAllText(Path.Combine(Folder, "mod.version"), Updated);
if (File.Exists(filePath))
{
File.Delete(filePath);
}
break;
}
case ModDownloadType.Modular:
{
List<ModManifestDiff> newEntries = ChangedFiles
.Where(x => x.State == ModManifestState.Added || x.State == ModManifestState.Changed)
.ToList();
var uri = new Uri(Url);
string tempDir = Path.Combine(updatePath, uri.Segments.Last());
if (!Directory.Exists(tempDir))
{
Directory.CreateDirectory(tempDir);
}
var sync = new object();
foreach (ModManifestDiff i in newEntries)
{
string filePath = Path.Combine(tempDir, i.Current.FilePath);
string dir = Path.GetDirectoryName(filePath);
if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
if (OnDownloadStarted(cancelArgs))
{
return;
}
var info = new FileInfo(filePath);
++fileDownloading;
if (!info.Exists || info.Length != i.Current.FileSize ||
!i.Current.Checksum.Equals(ModManifestGenerator.GetFileHash(filePath), StringComparison.OrdinalIgnoreCase))
{
client.DownloadFileCompleted += downloadComplete;
client.DownloadProgressChanged += downloadProgressChanged;
lock (sync)
{
client.DownloadFileAsync(new Uri(uri, i.Current.FilePath), filePath, sync);
Monitor.Wait(sync);
}
client.DownloadProgressChanged -= downloadProgressChanged;
client.DownloadFileCompleted -= downloadComplete;
info.Refresh();
if (info.Length != i.Current.FileSize)
{
throw new Exception(string.Format("Size of downloaded file \"{0}\" ({1}) differs from manifest ({2}).",
i.Current.FilePath, SizeSuffix.GetSizeSuffix(info.Length), SizeSuffix.GetSizeSuffix(i.Current.FileSize)));
}
string hash = ModManifestGenerator.GetFileHash(filePath);
if (!i.Current.Checksum.Equals(hash, StringComparison.OrdinalIgnoreCase))
{
throw new Exception(string.Format("Checksum of downloaded file \"{0}\" ({1}) differs from manifest ({2}).",
i.Current.FilePath, hash, i.Current.Checksum));
}
}
if (cancelArgs.Cancel || downloadArgs?.Cancel == true)
{
return;
}
if (OnDownloadCompleted(cancelArgs))
{
return;
}
}
client.DownloadFileCompleted += downloadComplete;
lock (sync)
{
client.DownloadFileAsync(new Uri(uri, "mod.manifest"), Path.Combine(tempDir, "mod.manifest"), sync);
Monitor.Wait(sync);
}
client.DownloadFileCompleted -= downloadComplete;
// Handle all non-removal file operations (move, rename)
List<ModManifestDiff> movedEntries = ChangedFiles.Except(newEntries)
.Where(x => x.State == ModManifestState.Moved)
.ToList();
if (OnApplyingManifest(cancelArgs))
{
return;
}
// Handle existing entries marked as moved.
foreach (ModManifestDiff i in movedEntries)
{
ModManifestEntry old = i.Last;
// This would be considered an error...
if (old == null)
{
continue;
}
string oldPath = Path.Combine(Folder, old.FilePath);
string newPath = Path.Combine(tempDir, i.Current.FilePath);
string dir = Path.GetDirectoryName(newPath);
if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
File.Copy(oldPath, newPath, true);
}
// Now move the stuff from the temporary folder over to the working directory.
foreach (ModManifestDiff i in newEntries.Concat(movedEntries))
{
string tempPath = Path.Combine(tempDir, i.Current.FilePath);
string workPath = Path.Combine(Folder, i.Current.FilePath);
string dir = Path.GetDirectoryName(workPath);
if (!string.IsNullOrEmpty(dir) && !Directory.Exists(dir))
{
Directory.CreateDirectory(dir);
}
File.Copy(tempPath, workPath, true);
}
// Once that has succeeded we can safely delete files that have been marked for removal.
List<ModManifestDiff> removedEntries = ChangedFiles
.Where(x => x.State == ModManifestState.Removed)
.ToList();
foreach (string path in removedEntries.Select(i => Path.Combine(Folder, i.Current.FilePath)).Where(File.Exists))
{
File.Delete(path);
}
// Same for files that have been moved.
foreach (string path in movedEntries
.Where(x => newEntries.All(y => y.Current.FilePath != x.Last.FilePath))
.Select(i => Path.Combine(Folder, i.Last.FilePath)).Where(File.Exists))
{
File.Delete(path);
}
string oldManPath = Path.Combine(Folder, "mod.manifest");
string newManPath = Path.Combine(tempDir, "mod.manifest");
if (File.Exists(oldManPath))
{
List<ModManifestEntry> oldManifest = ModManifest.FromFile(oldManPath);
List<ModManifestEntry> newManifest = ModManifest.FromFile(newManPath);
// Remove directories that are now empty.
RemoveEmptyDirectories(oldManifest, newManifest);
}
// And last but not least, copy over the new manifest.
File.Copy(newManPath, oldManPath, true);
break;
}
default:
throw new ArgumentOutOfRangeException();
}
}
