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using System.Diagnostics.CodeAnalysis;
namespace System.ComponentModel.DataAnnotations {
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Resources;
using System.Globalization;
using System.IO;
using System.Linq;
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class FileExtensionsAttribute : DataTypeAttribute {
private string _extensions;
public FileExtensionsAttribute()
: base(DataType.Upload) {
// DevDiv 468241: set DefaultErrorMessage not ErrorMessage, allowing user to set
// ErrorMessageResourceType and ErrorMessageResourceName to use localized messages.
DefaultErrorMessage = DataAnnotationsResources.FileExtensionsAttribute_Invalid;
}
public string Extensions {
get {
// Default file extensions match those from jquery validate.
return String.IsNullOrWhiteSpace(_extensions) ? "png,jpg,jpeg,gif" : _extensions;
}
set {
_extensions = value;
}
}
private string ExtensionsFormatted {
get {
return ExtensionsParsed.Aggregate((left, right) => left + ", " + right);
}
}
[SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase", Justification = "These strings are normalized to lowercase because they are presented to the user in lowercase format")]
private string ExtensionsNormalized {
get {
return Extensions.Replace(" ", "").Replace(".", "").ToLowerInvariant();
}
}
private IEnumerable<string> ExtensionsParsed {
get {
return ExtensionsNormalized.Split(',').Select(e => "." + e);
}
}
public override string FormatErrorMessage(string name) {
return String.Format(CultureInfo.CurrentCulture, ErrorMessageString, name, ExtensionsFormatted);
}
public override bool IsValid(object value) {
if (value == null) {
return true;
}
string valueAsString = value as string;
if (valueAsString != null) {
return ValidateExtension(valueAsString);
}
return false;
}
[SuppressMessage("Microsoft.Globalization", "CA1308:NormalizeStringsToUppercase", Justification = "These strings are normalized to lowercase because they are presented to the user in lowercase format")]
private bool ValidateExtension(string fileName) {
try {
return ExtensionsParsed.Contains(Path.GetExtension(fileName).ToLowerInvariant());
}
catch (ArgumentException) {
return false;
}
}
}
}
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