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