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/*
* Copyright (c) 2024 Vaughn Nugent
*
* Library: CMNext
* Package: Content.Publishing.Blog.Admin
* File: FtpStorageManager.cs
*
* CMNext is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* CMNext is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see https://www.gnu.org/licenses/.
*/
using System;
using System.IO;
using System.Net;
using System.Threading;
using System.Threading.Tasks;
using FluentFTP;
using FluentFTP.Exceptions;
using VNLib.Utils.Logging;
using VNLib.Utils.Resources;
using VNLib.Plugins;
using VNLib.Plugins.Extensions.Loading;
namespace Content.Publishing.Blog.Admin.Storage
{
[ConfigurationName("storage")]
internal class FtpStorageManager : StorageBase, IDisposable
{
private readonly AsyncFtpClient _client;
private readonly S3Config _storageConf;
protected override string? BasePath => _storageConf.BaseBucket;
public FtpStorageManager(PluginBase plugin, IConfigScope config)
{
_storageConf = config.Deserialze<S3Config>();
Uri uri = new (_storageConf.ServerAddress!);
//Init new client
_client = new(
uri.Host,
uri.Port,
//Logger in debug mode
logger: plugin.IsDebug() ? new FtpDebugLogger(plugin.Log) : null
);
}
public override async Task ConfigureServiceAsync(PluginBase plugin)
{
using ISecretResult password = await plugin.Secrets().GetSecretAsync("storage_secret");
//Init client credentials
_client.Credentials = new NetworkCredential(_storageConf.ClientId, password?.Result.ToString());
//If the user forces ssl, then assume it's an implicit connection and force certificate checking
if(_storageConf.UseSsl == true)
{
_client.Config.EncryptionMode = FtpEncryptionMode.Implicit;
}
else
{
_client.Config.EncryptionMode = FtpEncryptionMode.Auto;
_client.Config.ValidateAnyCertificate = true;
}
plugin.Log.Information("Connecting to ftp server");
await _client.AutoConnect(CancellationToken.None);
plugin.Log.Information("Successfully connected to ftp server");
}
///<inheritdoc/>
public override Task DeleteFileAsync(string filePath, CancellationToken cancellation)
{
return _client.DeleteFile(GetExternalFilePath(filePath), cancellation);
}
///<inheritdoc/>
public override async Task<long> ReadFileAsync(string filePath, Stream output, CancellationToken cancellation)
{
try
{
//Read the file
await _client.DownloadStream(output, GetExternalFilePath(filePath), token: cancellation);
return output.Position;
}
catch (FtpMissingObjectException)
{
//File not found
return -1;
}
}
///<inheritdoc/>
public override async Task WriteFileAsync(string filePath, Stream data, string ct, CancellationToken cancellation)
{
//Upload the file to the server
FtpStatus status = await _client.UploadStream(data, GetExternalFilePath(filePath), FtpRemoteExists.Overwrite, true, token: cancellation);
if (status == FtpStatus.Failed)
{
throw new ResourceUpdateFailedException($"Failed to update the remote resource {filePath}");
}
}
///<inheritdoc/>
public override string GetExternalFilePath(string filePath)
{
return string.IsNullOrWhiteSpace(BasePath) ? filePath : $"{BasePath}/{filePath}";
}
public void Dispose()
{
_client?.Dispose();
}
sealed class FtpDebugLogger(ILogProvider Log) : IFtpLogger
{
void IFtpLogger.Log(FtpLogEntry entry)
{
Log.Debug("FTP [{lvl}] -> {cnt}", entry.Severity.ToString(), entry.Message);
}
}
}
}
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