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Import media files

The following sample shows how a media file is imported into Litium.

A check is performed in the import folder in Litium with the Exists method, to see whether the file already exists.

private bool Exists(string fileName, Guid folderId, out File existingFile)
{
    using (var query = _dataService.CreateQuery<File>())
    {
        var items = query.Filter(x => x
            .Bool(b => b
                .Must(m => m.Field(SystemFieldDefinitionConstants.NameInvariantCulture, "eq", fileName)
                            .FolderSystemId(folderId))));
        existingFile = items.FirstOrDefault();
        return existingFile != null;
    }
}

FieldTemplateService is used to get the correct template for the import-file by file extension. Then a blob container is created by the blob service and the file to import is streamed into the blob container.

protected override void ProcessItem(Item item)
{
    var fieldTemplate = _fieldTemplateService.FindFileTemplate(item.FileInfo.Extension);
    if(fieldTemplate == null)
    {
        throw new Exception($"{Messages.MediaFieldTemplateNotFoundForExtension} {item.FileInfo.Extension}");
 
    }
 
    long fileSize = 0;            
    var blobContainer = _blobService.Create(File.BlobAuthority);
    using (var fileStream = item.FileInfo.OpenRead())
    {
        using (var stream = blobContainer.GetDefault().OpenWrite())
        {
            fileStream.CopyTo(stream);
            fileSize = fileStream.Length;
        }
    }
 
    if(Exists(item.FileInfo.Name, _importFolder.SystemId, out File existingFile))
    {
        existingFile = existingFile.MakeWritableClone();
        existingFile.BlobUri = blobContainer.Uri;
        existingFile.FileSize = fileSize;
        _fileService.Update(existingFile);
    }
    else
    {
        var file = new File(fieldTemplate.SystemId, _importFolder.SystemId, blobContainer.Uri, item.FileInfo.Name)
        {
            FileSize = fileSize,
            Id = item.FileInfo.Name
        };
        _fileService.Create(file);
    }
}

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