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namespace System.ComponentModel.DataAnnotations {
using System;
using System.ComponentModel.DataAnnotations.Resources;
using System.Text.RegularExpressions;
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class EmailAddressAttribute : DataTypeAttribute {
// This attribute provides server-side email validation equivalent to jquery validate,
// and therefore shares the same regular expression. See unit tests for examples.
private static Regex _regex = CreateRegEx();
public EmailAddressAttribute()
: base(DataType.EmailAddress) {
// DevDiv 468241: set DefaultErrorMessage not ErrorMessage, allowing user to set
// ErrorMessageResourceType and ErrorMessageResourceName to use localized messages.
DefaultErrorMessage = DataAnnotationsResources.EmailAddressAttribute_Invalid;
}
public override bool IsValid(object value) {
if (value == null) {
return true;
}
string valueAsString = value as string;
// Use RegEx implementation if it has been created, otherwise use a non RegEx version.
if (_regex != null) {
return valueAsString != null && _regex.Match(valueAsString).Length > 0;
}
else {
int atCount = 0;
foreach (char c in valueAsString) {
if (c == '@') {
atCount++;
}
}
return (valueAsString != null
&& atCount == 1
&& valueAsString[0] != '@'
&& valueAsString[valueAsString.Length - 1] != '@');
}
}
private static Regex CreateRegEx() {
// We only need to create the RegEx if this switch is enabled.
if (AppSettings.DisableRegEx) {
return null;
}
const string pattern = @"^((([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+(\.([a-z]|\d|[!#\$%&'\*\+\-\/=\?\^_`{\|}~]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])+)*)|((\x22)((((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(([\x01-\x08\x0b\x0c\x0e-\x1f\x7f]|\x21|[\x23-\x5b]|[\x5d-\x7e]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(\\([\x01-\x09\x0b\x0c\x0d-\x7f]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF]))))*(((\x20|\x09)*(\x0d\x0a))?(\x20|\x09)+)?(\x22)))@((([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|\d|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.)+(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])|(([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])([a-z]|\d|-|\.|_|~|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])*([a-z]|[\u00A0-\uD7FF\uF900-\uFDCF\uFDF0-\uFFEF])))\.?$";
const RegexOptions options = RegexOptions.Compiled | RegexOptions.IgnoreCase | RegexOptions.ExplicitCapture;
// Set explicit regex match timeout, sufficient enough for email parsing
// Unless the global REGEX_DEFAULT_MATCH_TIMEOUT is already set
TimeSpan matchTimeout = TimeSpan.FromSeconds(2);
try {
if (AppDomain.CurrentDomain.GetData("REGEX_DEFAULT_MATCH_TIMEOUT") == null) {
return new Regex(pattern, options, matchTimeout);
}
}
catch {
// Fallback on error
}
// Legacy fallback (without explicit match timeout)
return new Regex(pattern, options);
}
}
}
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