public UploadAttachmentCommandValidator(IInvitationValidator invitationValidator, IOptionsMonitor <BlobStorageOptions> options)
{
CascadeMode = CascadeMode.Stop;
RuleFor(x => x)
.NotNull();
RuleFor(x => x.FileName)
.NotEmpty()
.WithMessage("Filename not given!")
.MaximumLength(Attachment.FileNameLengthMax)
.WithMessage($"Filename too long! Max {Attachment.FileNameLengthMax} characters")
.Must(BeAValidFile)
.WithMessage(x => $"File {x.FileName} is not a valid file for upload!");
RuleFor(x => x.Content.Length)
.Must(BeSmallerThanMaxSize)
.When(x => x.Content != null)
.WithMessage($"Maximum file size is {options.CurrentValue.MaxSizeMb}MB!");
RuleFor(command => command)
.MustAsync((command, cancellationToken) => BeAnExistingInvitationAsync(command.InvitationId, cancellationToken))
.WithMessage(command => $"Invitation with this ID does not exist! Id={command.InvitationId}")
.MustAsync((command, cancellationToken) => NotHaveAttachmentWithFileNameAsync(command.InvitationId, command.FileName, cancellationToken))
.WithMessage(command => $"Invitation already has an attachment with filename {command.FileName}! Please rename file or choose to overwrite.")
.When(c => !c.OverWriteIfExists, ApplyConditionTo.CurrentValidator);
bool BeAValidFile(string fileName)
{
var suffix = Path.GetExtension(fileName?.ToLower());
return(suffix != null && !options.CurrentValue.BlockedFileSuffixes.Contains(suffix) && fileName?.IndexOfAny(Path.GetInvalidFileNameChars()) == -1);
}
bool BeSmallerThanMaxSize(long fileSizeInBytes)
{
var maxSizeInBytes = options.CurrentValue.MaxSizeMb * 1024 * 1024;
return(fileSizeInBytes < maxSizeInBytes);
}
async Task <bool> BeAnExistingInvitationAsync(int invitationId, CancellationToken cancellationToken)
=> await invitationValidator.IpoExistsAsync(invitationId, cancellationToken);
async Task <bool> NotHaveAttachmentWithFileNameAsync(int invitationId, string fileName, CancellationToken cancellationToken)
=> !await invitationValidator.AttachmentWithFileNameExistsAsync(invitationId, fileName, cancellationToken);
}