Script repository
The script adds a digit to the username if it is not unique. To execute the script, create a business rule triggering Before creating a user.
Username not limited by length
function IsUserNameUnique($username)
{
$user = Get-AdmUser $username -erroraction silentlycontinue
return $user -eq $Null
}
# Get username
$username = $Context.GetModifiedPropertyValue("samAccountName")
# Check if username is unique.
if (IsUserNameUnique($username))
{
return
}
# Generate unique username.
$uniqueUsername = $Null
for ($i = 1; $True; $i++)
{
$uniqueUsername = $username + $i;
if (IsUserNameUnique($uniqueUsername))
{
break
}
}
# Update sAMAccountName
$Context.SetModifiedPropertyValue("samAccountName", $uniqueUsername)
# Update userPrincipalName
$upnSuffix = $Context.GetObjectDomain("%distinguishedName%")
$userLogonName = $uniqueUsername + "@" + $upnSuffix
$Context.SetModifiedPropertyValue("userPrincipalName", $userLogonName)
$Context.LogMessage("The username was changed to " + $userLogonName `
+ ".", "Information")Username has a length limitation
In the script, the $maximumLength variable specifies the maximum number of characters that a username can have.
$maximumLength = 8 # TODO: modify me
function IsUserNameUnique($username)
{
$user = Get-AdmUser $username -erroraction silentlycontinue
return $user -eq $Null
}
# Get username
$username = $Context.GetModifiedPropertyValue("samAccountName")
# Check username length.
if ($username.Length -gt $maximumLength)
{
$username = $username.SubString(0 , $maximumLength)
}
elseif (IsUserNameUnique($username))
{
return
}
# Generate unique username.
$uniqueUsername = $username
for ($i = 1; $True; $i++)
{
if (IsUserNameUnique($uniqueUsername))
{
break
}
$difference = $maximumLength - $username.Length - $i.ToString().Length
if ($difference -lt 0)
{
$username = $username.Substring(0, $username.Length + $difference)
}
if ([System.String]::IsNullOrEmpty($username))
{
$Context.Cancel("Unable to generate a unique username, because the number length exceeds the maximum length of the username")
return
}
$uniqueUsername = $username + $i;
}
# Update sAMAccountName
$Context.SetModifiedPropertyValue("samAccountName", $uniqueUsername)
# Update userPrincipalName
$upnSuffix = $Context.GetObjectDomain("%distinguishedName%")
$userLogonName = $uniqueUsername + "@" + $upnSuffix
$Context.SetModifiedPropertyValue("userPrincipalName", $userLogonName)
$Context.LogMessage("The username was changed to " + $userLogonName `
+ ".", "Information")
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