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CustomFileSystemProvider.cs
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CustomFileSystemProvider.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Web;
using DevExpress.Web;
public class CustomFileSystemProvider : FileSystemProviderBase {
public DataProvider Data { get; set; }
Dictionary<int, CacheEntry> FolderCache { get; set; }
FileSystemItem RootItem { get; set; }
public CustomFileSystemProvider(string rootFolder)
: base(rootFolder) {
var dbContext = new FilesDbContext();
Data = new DataProvider(dbContext);
RefreshFolderCache();
}
public override string RootFolderDisplayName { get { return RootItem.Name; } }
public override IEnumerable<FileManagerFile> GetFiles(FileManagerFolder folder) {
int folderId = GetItemId(folder);
return Data.FileSystemItems.
Join(Data.PermissionsSet, i => i.Id, p => p.Item.Id, (i, pi) => new {
Item = i,
Permissions = pi
}).
Where(dto => dto.Item.Parent != null && dto.Item.Parent.Id == folderId && !dto.Item.IsFolder).
ToList().
Select(dto => new FileManagerFile(this, folder, dto.Item.Name, dto.Item.Id.ToString(), new FileManagerFileProperties {
Permissions = GetFilePermissionsInternal(dto.Permissions)
}));
}
public override IEnumerable<FileManagerFolder> GetFolders(FileManagerFolder parentFolder) {
FileSystemItem folderItem = FindFolderItem(parentFolder);
return FolderCache.Values.
Where(entry => entry.Item.Parent == folderItem && entry.Item.IsFolder).
Select(entry => new FileManagerFolder(this, parentFolder, entry.Item.Name, entry.Item.Id.ToString(),
new FileManagerFolderProperties {
Permissions = GetFolderPermissionsInternal(entry.Permissions)
}));
}
public override FileManagerFilePermissions GetFilePermissions(FileManagerFile file) {
int fileId = int.Parse(file.Id);
Permissions permissions = Data.PermissionsSet.FirstOrDefault(p => p.Item.Id == fileId);
if(permissions == null)
return FileManagerFilePermissions.Default;
return GetFilePermissionsInternal(permissions);
}
public override FileManagerFolderPermissions GetFolderPermissions(FileManagerFolder folder) {
if(string.IsNullOrEmpty(folder.RelativeName))
return FileManagerFolderPermissions.Default;
int folderId = int.Parse(folder.Id);
Permissions permissions = Data.PermissionsSet.FirstOrDefault(p => p.Item.Id == folderId);
if(permissions == null)
return FileManagerFolderPermissions.Default;
return GetFolderPermissionsInternal(permissions);
}
FileManagerFilePermissions GetFilePermissionsInternal(Permissions permissions) {
return (permissions.Delete ? FileManagerFilePermissions.Delete : FileManagerFilePermissions.Default)
| (permissions.Move ? FileManagerFilePermissions.Move : FileManagerFilePermissions.Default)
| (permissions.Copy ? FileManagerFilePermissions.Copy : FileManagerFilePermissions.Default)
| (permissions.Rename ? FileManagerFilePermissions.Rename : FileManagerFilePermissions.Default)
| (permissions.Download ? FileManagerFilePermissions.Download : FileManagerFilePermissions.Default);
}
FileManagerFolderPermissions GetFolderPermissionsInternal(Permissions permissions) {
return (permissions.Delete ? FileManagerFolderPermissions.Delete : FileManagerFolderPermissions.Default)
| (permissions.Move ? FileManagerFolderPermissions.Move : FileManagerFolderPermissions.Default)
| (permissions.Copy ? FileManagerFolderPermissions.Copy : FileManagerFolderPermissions.Default)
| (permissions.Rename ? FileManagerFolderPermissions.Rename : FileManagerFolderPermissions.Default)
| (permissions.Create ? FileManagerFolderPermissions.Create : FileManagerFolderPermissions.Default)
| (permissions.Upload ? FileManagerFolderPermissions.Upload : FileManagerFolderPermissions.Default)
| (permissions.MoveOrCopyInto ? FileManagerFolderPermissions.MoveOrCopyInto : FileManagerFolderPermissions.Default);
}
public override bool Exists(FileManagerFile file) {
return FindFileItem(file) != null;
}
public override bool Exists(FileManagerFolder folder) {
return FindFolderItem(folder) != null;
}
public override Stream ReadFile(FileManagerFile file) {
FileSystemItem fileItem = FindFileItem(file);
return new MemoryStream(fileItem.Content.ToArray());
}
public override DateTime GetLastWriteTime(FileManagerFile file) {
FileSystemItem fileItem = FindFileItem(file);
return fileItem.LastWriteTime;
}
public override DateTime GetLastWriteTime(FileManagerFolder folder) {
FileSystemItem folderItem = FindFolderItem(folder);
return folderItem.LastWriteTime;
}
public override long GetLength(FileManagerFile file) {
FileSystemItem fileItem = FindFileItem(file);
return fileItem.Content.Length;
}
public override void CreateFolder(FileManagerFolder parent, string name) {
UpdateAndSaveChanges(parent, parentItem => Data.CreateFolder(parentItem, name));
}
public override void DeleteFile(FileManagerFile file) {
UpdateAndSubmitChanges(file, item => Data.Remove(item));
}
public override void DeleteFolder(FileManagerFolder folder) {
UpdateAndSaveChanges(folder, item => Data.Remove(item));
}
public override void MoveFile(FileManagerFile file, FileManagerFolder newParentFolder) {
UpdateAndSubmitChanges(file, item => item.Parent = FindFolderItem(newParentFolder));
}
public override void MoveFolder(FileManagerFolder folder, FileManagerFolder newParentFolder) {
UpdateAndSaveChanges(folder, item => item.Parent = FindFolderItem(newParentFolder));
}
public override void RenameFile(FileManagerFile file, string name) {
UpdateAndSubmitChanges(file, item => item.Name = name);
}
public override void RenameFolder(FileManagerFolder folder, string name) {
UpdateAndSaveChanges(folder, item => item.Name = name);
}
public override void UploadFile(FileManagerFolder folder, string fileName, Stream content) {
UpdateAndSaveChanges(folder, folderItem => Data.CreateFile(folderItem, fileName, content));
}
public override void CopyFile(FileManagerFile file, FileManagerFolder newParentFolder) {
FileSystemItem fileItem = FindFileItem(file);
CopyCore(fileItem, newParentFolder.RelativeName, false);
}
public override void CopyFolder(FileManagerFolder folder, FileManagerFolder newParentFolder) {
List<FileManagerFolder> folders = new List<FileManagerFolder>();
FillSubFoldersList(folder, folders);
int folderNameOffset = !string.IsNullOrEmpty(folder.Parent.RelativeName) ? folder.Parent.RelativeName.Length + 1 : 0;
foreach(FileManagerFolder copyingFolder in folders) {
FileSystemItem folderItem = FindFolderItem(copyingFolder);
string folderPath = newParentFolder.RelativeName;
if(copyingFolder != folder)
folderPath = Path.Combine(folderPath, copyingFolder.Parent.RelativeName.Substring(folderNameOffset));
CopyCore(folderItem, folderPath, true);
foreach(FileManagerFile currentFile in copyingFolder.GetFiles()) {
FileSystemItem fileItem = FindFileItem(currentFile);
CopyCore(fileItem, Path.Combine(folderPath, copyingFolder.Name), false);
}
}
}
void FillSubFoldersList(FileManagerFolder folder, List<FileManagerFolder> list) {
list.Add(folder);
foreach(FileManagerFolder subFolder in folder.GetFolders())
FillSubFoldersList(subFolder, list);
}
void CopyCore(FileSystemItem item, string path, bool isFolder) {
FileManagerFolder newParentFolder = new FileManagerFolder(this, path, (string)null);
UpdateAndSaveChanges(newParentFolder,
newParentItem => {
if(isFolder)
Data.CreateFolder(newParentItem, item.Name);
else
Data.CreateFile(newParentItem, item.Name, item.Content);
});
}
protected void UpdateAndSubmitChanges(FileManagerFile file, Action<FileSystemItem> update) {
UpdateAndSubmitChangesCore(FindFileItem(file), update);
}
protected void UpdateAndSaveChanges(FileManagerFolder folder, Action<FileSystemItem> update) {
UpdateAndSubmitChangesCore(FindFolderItem(folder), update);
}
protected void UpdateAndSubmitChangesCore(FileSystemItem item, Action<FileSystemItem> update) {
update(item);
Data.SaveChanges();
RefreshFolderCache();
}
protected FileSystemItem FindFileItem(FileManagerFile file) {
if(file.Id == null)
return FindFileItemByParentFolder(file.Name, file.Folder);
int fileId = GetItemId(file);
return Data.FindById(fileId);
}
protected FileSystemItem FindFolderItem(FileManagerFolder folder) {
if(folder.Id == null)
return FindFolderItemByRelativeName(folder);
int folderId = GetItemId(folder);
return FolderCache[folderId].Item;
}
protected FileSystemItem FindFileItemByParentFolder(string itemName, FileManagerFolder parentFolder) {
FileSystemItem parentItem = FindFolderItemByRelativeName(parentFolder);
return Data.FileSystemItems.FirstOrDefault(
item => item.Parent != null && item.Parent.Id == parentItem.Id && !item.IsFolder && item.Name == itemName);
}
protected int GetItemId(FileManagerItem fileManagerItem) {
if(string.IsNullOrEmpty(fileManagerItem.RelativeName))
return RootItem.Id;
return int.Parse(fileManagerItem.Id);
}
protected FileSystemItem FindFolderItemByRelativeName(FileManagerFolder folder) {
return FolderCache.Values.
Select(entry => entry.Item).
Where(item => item.IsFolder && GetRelativeName(item) == folder.RelativeName).
FirstOrDefault();
}
protected string GetRelativeName(FileSystemItem folderItem) {
if(folderItem.Parent == null)
return string.Empty;
if(folderItem.Parent.Parent == null)
return folderItem.Name;
string name = GetRelativeName(folderItem.Parent);
return Path.Combine(name, folderItem.Name);
}
protected void RefreshFolderCache() {
FolderCache = Data.FileSystemItems.
Join(Data.PermissionsSet, i => i.Id, p => p.Item.Id, (i, pi) => new {
Item = i,
Permissions = pi
}).
Where(dto => dto.Item.IsFolder).
ToDictionary(dto => dto.Item.Id, dto => new CacheEntry {
Item = dto.Item,
Permissions = dto.Permissions
});
RootItem = FolderCache.Values.
Select(entry => entry.Item).
First(item => item.Parent == null);
}
class CacheEntry {
public FileSystemItem Item { get; set; }
public Permissions Permissions { get; set; }
}
}