/// <summary>
/// To ease management, we need a one-to-one transformation from userPrincipalName to SamAccountName
/// </summary>
/// <param name="userPrincipalName">User principal name, must contain a prefix: prefix_accoutnname</param>
/// <returns></returns>
public static string SamAccountNameFromUserPrincipalName(string userPrincipalName)
{
if (!userPrincipalName.Contains("_"))
{
throw new Exception($"User name '{userPrincipalName}' does not start with a prefix and an underscore: prefix_username");
}
string samAccountName = userPrincipalName;
string prefix = userPrincipalName.Split("_".ToCharArray()).First() + "_";
if (prefix.Length > 5)
{
throw new Exception($"The length of the prefix '{prefix}' exceeds the 4 character limit.");
}
string cleanName = string.Join("_", userPrincipalName.Split("_".ToCharArray()).Skip(1));
// The maximum user length depends on if this is a local account, or a domain account.
// https://serverfault.com/questions/105142/windows-server-2008-r2-change-the-maximum-username-length
int maxUserNameLength = 20;
if (samAccountName.Length > maxUserNameLength)
{
samAccountName = prefix + UtilsEncryption
.GetMD5(cleanName)
.Substring(0, maxUserNameLength - prefix.Length);
}
return(samAccountName);
}
/// <summary>
/// Get the target destionation path
/// </summary>
/// <param name="key"></param>
/// <returns></returns>
protected string GetDestinationPath(string key)
{
var invalids = Path.GetInvalidFileNameChars();
var sanitizedKey = string.Join("_", key.Split(invalids, StringSplitOptions.RemoveEmptyEntries)).TrimEnd('.');
string fileName = this.UseKeyAsFileName ? sanitizedKey : UtilsEncryption.GetShortHash(key, 12);
return(Path.Combine(this.StorageDir, fileName + ".json"));
}