public virtual NormalizedEmailAddress NormalizeAsParts(string emailAddress)
{
if (string.IsNullOrWhiteSpace(emailAddress))
{
return(null);
}
var parts = emailAddress
.Trim()
.Split('@', System.StringSplitOptions.RemoveEmptyEntries);
// only 1 @ permitted, not at the start or end
if (parts.Length != 2)
{
return(null);
}
// Note that in practice it's very unlikely that the local part needs to be case-sensitive
// but technically only the domain part is case-insensitive. A username formatter may choose
// to be less RFC compliant here, but for email correspondance we should honor the spec.
var local = parts[0];
var domain = EmailDomainName.Parse(parts[1]);
var result = new NormalizedEmailAddress(local, domain);
return(result);
}
public virtual NormalizedEmailAddress UniquifyAsParts(NormalizedEmailAddress emailAddressParts)
{
return(emailAddressParts?.ToLower());
}
/// <summary>
/// Format an email address into a value that can be used for
/// uniqueness comparisons. The default implementation simply lowercases
/// the email, but this can be overriden to provide more strict uniqueness
/// checks.
/// </summary>
/// <param name="emailAddressParts">
/// The pre-normalized email address to uniquify. If the value is <see langword="null"/>
/// then <see langword="null"/> is returned.
/// </param>
public static string Uniquify(this IEmailAddressUniquifier uniquifier, NormalizedEmailAddress emailAddressParts)
{
return(uniquifier
.UniquifyAsParts(emailAddressParts)
?.ToEmailAddress());
}
