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using Microsoft.EntityFrameworkCore;
using MimeDetective;
using MimeDetective.Definitions;
using System.Security.Cryptography;
namespace HyperBooru.Services;
public interface IMediaService {
public void SetDescription(
Media media,
string? shortDescription,
string? longDescription);
public void SetIngest(Media media, bool ingest);
public Media Create(
Stream fileData,
string fileName,
string? checksum = null,
DateTime? lastAccessTime = null,
DateTime? lastWriteTime = null,
DateTime? createTime = null);
public void Delete(Guid media);
public void Delete(Media media);
public string GetPath(Media media);
public string GetPath(Media media, int width, int height);
}
public class MediaService : IMediaService {
private IDbContextFactory<HBContext> dbFactory;
private IConfigService config;
private ContentInspector inspector;
public MediaService(IDbContextFactory<HBContext> dbFactory,
IConfigService config) {
this.dbFactory = dbFactory;
this.config = config;
ContentInspectorBuilder inspectorBuilder = new() {
Definitions =
Default.FileTypes.Images.All()
.Union(Default.FileTypes.Video.All())
.ToList()
};
inspector = inspectorBuilder.Build();
}
public void SetIngest(Media media, bool ingest) {
using var db = dbFactory.CreateDbContext();
media = db.Media
.Include(m => m.Tags)
.ThenInclude(t => t.TagDefinition)
.First(m => m.Guid == media.Guid);
var ingestTag = db.TagDefinitions
.First(td => td.Guid == HBContext.IngestTag);
if(ingest) {
if(!media.Tags.Select(t => t.TagDefinition.Guid).Contains(HBContext.IngestTag))
media.Tags.Add(new(ingestTag));
} else {
media.Tags.RemoveAll(t => t.TagDefinition.Guid == HBContext.IngestTag);
}
db.SaveChanges();
}
public void SetDescription(
Media media,
string? shortDescription,
string? longDescription) {
using var db = dbFactory.CreateDbContext();
var m = db.Media.First(m => m.Guid == media.Guid);
shortDescription = shortDescription?.Trim();
longDescription = longDescription?.Trim();
if(string.IsNullOrEmpty(shortDescription))
shortDescription = null;
if(string.IsNullOrEmpty(longDescription))
longDescription = null;
m.ShortDescription = shortDescription;
m.LongDescription = longDescription;
db.SaveChanges();
}
public Media Create(
Stream fileData,
string fileName,
string? checksum = null,
DateTime? lastAccessTime = null,
DateTime? lastWriteTime = null,
DateTime? createTime = null) {
using var db = dbFactory.CreateDbContext();
using var transaction = db.Database.BeginTransaction();
if(fileData.Length == 0)
throw new MediaCreateException("File is empty");
// Calculate the checksum using the in-memory file contents
var hash = BitConverter
.ToString(MD5.Create().ComputeHash(fileData))
.Replace("-", "")
.ToLower();
if(checksum is not null && hash != checksum.ToLower())
throw new MediaCreateException("Checksum does not match");
var fileRecord = new UploadedFile() {
Filename = fileName,
OriginalChecksum = hash,
UploadTime = DateTime.UtcNow,
LastAccessTime = lastAccessTime,
LastWriteTime = lastWriteTime,
CreateTime = createTime
};
fileData.Seek(0, SeekOrigin.Begin);
var defs = inspector.Inspect(fileData);
var mime = defs.ByMimeType().FirstOrDefault()?.MimeType;
if(mime is null)
throw new MediaCreateException("Unsupported file type");
var media = db.Media
.FirstOrDefault(m => m.Checksum == hash);
if(media is null) {
var ingestTagDef = db.TagDefinitions
.First(td => td.Guid == HBContext.IngestTag);
media = new() {
UploadedFiles = new() {
fileRecord
},
Tags = new() {
new() { TagDefinition = ingestTagDef }
}
};
using var newFile = System.IO.File.Create(GetPath(media));
fileData.Seek(0, SeekOrigin.Begin);
fileData.CopyTo(newFile);
newFile.Flush();
db.Media.Add(media);
db.SaveChanges();
media.CurrentUploadedFile = fileRecord;
db.SaveChanges();
} else {
media.UploadedFiles.Add(fileRecord);
db.Update(media);
db.SaveChanges();
}
transaction.Commit();
return media;
}
public void Delete(Guid media) {
using var db = dbFactory.CreateDbContext();
var m = db.Media.First(m => m.Guid == media);
try {
System.IO.File.Delete(
Path.Join(
config.MediaBasePath,
m.Guid.ToString().Substring(0, 2),
m.Guid.ToString().Substring(2, 2),
m.Guid.ToString()));
} catch(IOException) {}
try {
System.IO.Directory.Delete(
Path.Join(
config.MediaBasePath,
m.Guid.ToString().Substring(0, 2),
m.Guid.ToString().Substring(2, 2)));
} catch(IOException) {}
try {
System.IO.Directory.Delete(
Path.Join(
config.MediaBasePath,
m.Guid.ToString().Substring(0, 2)));
} catch(IOException) {}
db.Media.Remove(m);
db.SaveChanges();
}
public void Delete(Media media) =>
Delete(media.Guid);
public string GetPath(Media media) {
var fileInfo = new FileInfo(
Path.Join(
config.MediaBasePath,
media.Guid.ToString().Substring(0, 2),
media.Guid.ToString().Substring(2, 2),
media.Guid.ToString()));
Directory.CreateDirectory(fileInfo.Directory.FullName);
return fileInfo.FullName;
}
public string GetPath(Media media, int width, int height) {
var fileInfo = new FileInfo(Path.Join(
config.ThumbnailBasePath,
media.Guid.ToString().Substring(0, 2),
media.Guid.ToString().Substring(2, 2),
$"{media.Guid.ToString()}-{width}-{height}"));
Directory.CreateDirectory(fileInfo.Directory.FullName);
return fileInfo.FullName;
}
}
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