/// <summary>
/// Check if file is valid.
/// Use only the custom function if provided. Else check if the file has an allowed extension and mimetype.
/// </summary>
/// <param name="filePath">File path.</param>
/// <param name="mimeType">File mimetype.</param>
/// <returns></returns>
public bool Check(string filePath, string mimeType)
{
if (Function != null)
{
return(Function(filePath, mimeType));
}
return(AllowedExts.Contains(Path.GetExtension(filePath)) && AllowedMimeTypes.Contains(mimeType.ToLower()));
}
/// <summary>
/// Validates the specified value with respect to the current validation attribute.
/// </summary>
/// <param name="value">The value to validate.</param>
/// <param name="validationContext">The context information about the validation operation.</param>
/// <returns>An instance of the <see cref="T:System.ComponentModel.DataAnnotations.ValidationResult" /> class.</returns>
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
var name = string.IsNullOrEmpty(validationContext.DisplayName)
? validationContext.MemberName
: validationContext.DisplayName;
var fileInformation = (HttpFile)value;
var mimeType = fileInformation.MediaType;
if (!AllowedMimeTypes.Contains(mimeType))
{
return(new ValidationResult(string.Format(Resources.MimeTypeNotAllowedText, name, mimeType)));
}
var length = fileInformation.Buffer.LongLength;
var friendlyLength = ByteSize.FromBytes(length).ToString("#.#");
var friendlyLimit = ByteSize.FromBytes(FileSizeLimit).ToString("#.#");
return(length > FileSizeLimit
? new ValidationResult(string.Format(Resources.FileSizeLimitReachedText, friendlyLength, friendlyLimit))
: ValidationResult.Success);
}
