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<#
.SYNOPSIS
   Download OpenVPN profile from dl.php.

.DESCRIPTION
   Posts optional form fields (username/token) to the given dl.php URL and saves the response to a file.
   This is a sample script and may need to be modified to suit your needs.
   You will need to set the URL, Username, Token, router, filetype, and output file as needed.
   FileType may be one of 'ovpn', 'qr' or 'refresh'. refresh will generate a refresh request to the server for that 
   particular router.
#>

$Url = 'http://localhost/totp_opnsense/dl.php'
$Username = ''
$Token = ''
$OutputFile = 'client.ovpn'
$Router = ''
$FileType = ''
$Insecure = $true
$Quiet = $false

if ($Insecure) { [Net.ServicePointManager]::ServerCertificateValidationCallback = { $true }; };

$form = @{}; 
if ($Username -ne '') { $form['username'] = $Username; };
if ($Token -ne '') { $form['token'] = $Token; };
if ($Router -ne '') { $form['router'] = $Router; };
if ($FileType -ne '') { $form['filetype'] = $FileType; };

try {
   $resp = Invoke-WebRequest -Uri $Url -Method Post -Body $form -SessionVariable session -OutFile $OutputFile -ErrorAction Stop;
} catch {
   Write-Error 'Request failed:'; Write-Error $_.Exception.Message; exit 1;
};

# If server suggested a filename, use it
$cd = $null;
if ($resp.Headers.ContainsKey('Content-Disposition')) { $cd = $resp.Headers['Content-Disposition']; };
if ($cd -and ($cd -match 'filename="?([^\";]+)"?')) {
   $serverName = $Matches[1];
   if ($serverName -and ($serverName -ne $OutputFile)) {
      try {
         Move-Item -Force -Path $OutputFile -Destination $serverName;
         if (-not $Quiet) { Write-Output ('Saved to {0}' -f $serverName); };
         exit 0;
      } catch {
         Write-Warning 'Failed to rename downloaded file to server-suggested filename.'; 
         if (-not $Quiet) { Write-Output ('Saved to {0}' -f $OutputFile); };
         exit 0;
      };
   } else {
      if (-not $Quiet) { Write-Output ('Saved to {0}' -f $OutputFile); };
      exit 0;
   };
} else {
   if (-not $Quiet) { Write-Output ('Saved to {0}' -f $OutputFile); };
   exit 0;
};