Private/Assert-DeviceIMEI.ps1
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function Assert-DeviceIMEI { param( [Parameter(Mandatory)] [string] $IMEI ) # Strip hyphens and spaces $data = $IMEI -replace "-", "" $data = $data -replace " ", "" # Step 1: Check the length of the IMEI number if ($data.Length -lt 14 -or $data.Length -gt 16) { $reason = "Invalid IMEI length" Write-Warning -Message ("{0} :: The IMEI {1} resulted in {2}." -f $MyInvocation.MyCommand, $data, $reason) return @{ "Valid" = $false "Reason" = $reason "Data" = $data } } # Step 2: Verify the check digit $luhnCheck = Test-LuhnCheck -Data $IMEI if (-not $luhnCheck) { $reason = "Invalid data. Could not be verified using Luhn algorithm. Checksum violated." Write-Warning -Message ("{0} :: The IMEI {1} resulted in {2}" -f $MyInvocation.MyCommand, $IMEI, $reason) return @{ "Valid" = $false "Reason" = $reason "Data" = $data } } # Step 3: Validate the type allocation code (TAC) # TODO : Add if required, this requires an API access. return @{ "Valid" = $true "Reason" = "" "Data" = $data } } |