public IEnumerable <string> HasBody(ISenderConfiguration configuration, SenderRequest request)
{
if (!configuration.AllowEmptyBody && string.IsNullOrWhiteSpace(request.Body))
{
yield return("Message body cannot be empty");
}
}
public IEnumerable <string> HasSubject(ISenderConfiguration configuration, SenderRequest request)
{
if (!configuration.AllowEmptySubject && string.IsNullOrWhiteSpace(request.Subject))
{
yield return("Message subject cannot be empty");
}
}
private EmailMessage(SenderRequest originalRequest, string from, string to, string?subject, string?body)
{
OriginalRequest = originalRequest;
From = from;
To = to;
Subject = subject;
Body = body;
}
public async Task Send(SenderRequest request, CancellationToken cancellationToken = default)
{
var configuration = await _senderConfigurationRepository.Retrieve(request.ConfigurationId) ??
throw new MissingConfigurationException(request.ConfigurationId);
_senderRequestValidator.Validate(configuration, request);
var from = request.FromEmail ?? configuration.DefaultFromEmail;
var to = configuration.ToEmail;
var messageBody = GetMessageBody(configuration, request);
await Send(EmailMessage.Create(request, from, to, request.Subject, messageBody), cancellationToken);
}
public void Validate(ISenderConfiguration configuration, SenderRequest request)
{
var results = new[]
{
HasSubject(configuration, request),
HasBody(configuration, request),
};
var errorMessages = results.SelectMany(m => m);
if (errorMessages.Any())
{
throw new InvalidSenderRequestException(errorMessages);
}
}
private string?GetMessageBody(ISenderConfiguration configuration, SenderRequest request)
{
if (configuration.TemplateType == null)
{
return(request.Body);
}
var templateApplicator = _templateApplicators.FirstOrDefault(a => a.Supports(configuration));
if (templateApplicator == null)
{
throw new NotSupportedException($"Template type {configuration.TemplateType} is not supported");
}
return(templateApplicator.Apply(configuration, request));
}
public static EmailMessage Create(SenderRequest originalRequest, string from, string to, string?subject = null, string?body = null) => new EmailMessage(originalRequest, from, to, subject, body);