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using System;
using System.IO;
using System.Text;
using System.Threading.Tasks;
using Azure;
using Azure.Storage.Blobs;
using Azure.Storage.Blobs.Models;
using Microsoft.Extensions.Options;
using StardewModdingAPI.Web.Framework.Clients.Pastebin;
using StardewModdingAPI.Web.Framework.Compression;
using StardewModdingAPI.Web.Framework.ConfigModels;
namespace StardewModdingAPI.Web.Framework.Storage
{
/// <summary>Provides access to raw data storage.</summary>
internal class StorageProvider : IStorageProvider
{
/*********
** Fields
*********/
/// <summary>The API client settings.</summary>
private readonly ApiClientsConfig ClientsConfig;
/// <summary>The underlying Pastebin client.</summary>
private readonly IPastebinClient Pastebin;
/// <summary>The underlying text compression helper.</summary>
private readonly IGzipHelper GzipHelper;
/// <summary>Whether Azure blob storage is configured.</summary>
private bool HasAzure => !string.IsNullOrWhiteSpace(this.ClientsConfig.AzureBlobConnectionString);
/// <summary>The number of days since the blob's last-modified date when it will be deleted.</summary>
private int ExpiryDays => this.ClientsConfig.AzureBlobTempExpiryDays;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="clientsConfig">The API client settings.</param>
/// <param name="pastebin">The underlying Pastebin client.</param>
/// <param name="gzipHelper">The underlying text compression helper.</param>
public StorageProvider(IOptions<ApiClientsConfig> clientsConfig, IPastebinClient pastebin, IGzipHelper gzipHelper)
{
this.ClientsConfig = clientsConfig.Value;
this.Pastebin = pastebin;
this.GzipHelper = gzipHelper;
}
/// <summary>Save a text file to storage.</summary>
/// <param name="content">The content to upload.</param>
/// <param name="compress">Whether to gzip the text.</param>
/// <returns>Returns metadata about the save attempt.</returns>
public async Task<UploadResult> SaveAsync(string content, bool compress = true)
{
string id = Guid.NewGuid().ToString("N");
// save to Azure
if (this.HasAzure)
{
try
{
using Stream stream = new MemoryStream(Encoding.UTF8.GetBytes(content));
BlobClient blob = this.GetAzureBlobClient(id);
await blob.UploadAsync(stream);
return new UploadResult(true, id, null);
}
catch (Exception ex)
{
return new UploadResult(false, null, ex.Message);
}
}
// save to local filesystem for testing
else
{
string path = this.GetDevFilePath(id);
Directory.CreateDirectory(Path.GetDirectoryName(path));
File.WriteAllText(path, content);
return new UploadResult(true, id, null);
}
}
/// <summary>Fetch raw text from storage.</summary>
/// <param name="id">The storage ID returned by <see cref="SaveAsync"/>.</param>
public async Task<StoredFileInfo> GetAsync(string id)
{
// fetch from blob storage
if (Guid.TryParseExact(id, "N", out Guid _))
{
// Azure Blob storage
if (this.HasAzure)
{
try
{
BlobClient blob = this.GetAzureBlobClient(id);
Response<BlobDownloadInfo> response = await blob.DownloadAsync();
using BlobDownloadInfo result = response.Value;
using StreamReader reader = new StreamReader(result.Content);
DateTimeOffset expiry = result.Details.LastModified + TimeSpan.FromDays(this.ExpiryDays);
string content = this.GzipHelper.DecompressString(reader.ReadToEnd());
return new StoredFileInfo
{
Success = true,
Content = content,
Expiry = expiry.UtcDateTime
};
}
catch (RequestFailedException ex)
{
return new StoredFileInfo
{
Error = ex.ErrorCode == "BlobNotFound"
? "There's no file with that ID."
: $"Could not fetch that file from storage ({ex.ErrorCode}: {ex.Message})."
};
}
}
// local filesystem for testing
else
{
FileInfo file = new FileInfo(this.GetDevFilePath(id));
if (file.Exists)
{
if (file.LastWriteTimeUtc.AddDays(this.ExpiryDays) < DateTime.UtcNow)
file.Delete();
else
{
return new StoredFileInfo
{
Success = true,
Content = File.ReadAllText(file.FullName),
Expiry = DateTime.UtcNow.AddDays(this.ExpiryDays),
Warning = "This file was saved temporarily to the local computer. This should only happen in a local development environment."
};
}
}
return new StoredFileInfo
{
Error = "There's no file with that ID."
};
}
}
// get from Pastebin
else
{
PasteInfo response = await this.Pastebin.GetAsync(id);
response.Content = this.GzipHelper.DecompressString(response.Content);
return new StoredFileInfo
{
Success = response.Success,
Content = response.Content,
Error = response.Error
};
}
}
/// <summary>Get a client for reading and writing to Azure Blob storage.</summary>
/// <param name="id">The file ID.</param>
private BlobClient GetAzureBlobClient(string id)
{
var azure = new BlobServiceClient(this.ClientsConfig.AzureBlobConnectionString);
var container = azure.GetBlobContainerClient(this.ClientsConfig.AzureBlobTempContainer);
return container.GetBlobClient($"uploads/{id}");
}
/// <summary>Get the absolute file path for an upload when running in a local test environment with no Azure account configured.</summary>
/// <param name="id">The file ID.</param>
private string GetDevFilePath(string id)
{
return Path.Combine(Path.GetTempPath(), "smapi-web-temp", $"{id}.txt");
}
}
}
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