/// <summary>
/// Downsamples all image attachments, and ensures that each attachment
/// is below the size limit.
/// </summary>
private bool ProcessAttachments(
IList <Attachment> attachments,
out IList <string> attachmentErrors)
{
attachmentErrors = new List <string>();
foreach (var attachment in attachments)
{
if (attachment.IsImage)
{
bool downsampled = _imageProcessor.DownsampleImageToJpeg
(
attachment.AttachmentData.FileContents,
c_maxImageWidth,
c_maxImageHeight,
out var newImageData
);
if (downsampled)
{
attachment.AttachmentData.FileContents = newImageData;
attachment.FileName = Path.ChangeExtension(attachment.FileName, "jpg");
attachment.ContentType = "image/jpeg";
}
}
if (attachment.AttachmentData.FileContents.Length
> c_maxAttachmentSizeKb * 1024)
{
attachmentErrors.Add
(
$"Attachment {attachment.FileName} exceeds maximum size of "
+ $"{c_maxAttachmentSizeKb} KB."
);
}
}
return(!attachmentErrors.Any());
}
