PSMDE

0.3.0

private/Get-MdeAuthorizationHeader.ps1

                                function Get-MdeAuthorizationHeader {

  if ($script:tokenCache) { $tc = Get-AesSessionSecret -cipherText $script:tokenCache } else { $tc = $null }

  $expired = $tc ? [DateTime]::Now -gt [TimeZoneInfo]::ConvertTimeFromUtc(([DateTime]::UnixEpoch).AddSeconds((Get-ParsedToken -token $tc).exp), [TimeZoneInfo]::FindSystemTimeZoneById('Central European Standard Time')) : $true

  Write-Verbose "Token expired: $expired"

  if ($expired) {

    if ($appId -and $appSecret -and $tenantId) {

      try {

        $ai = Get-AesSessionSecret -cipherText $script:appId

        $as = Get-AesSessionSecret -cipherText $script:appSecret

        $ti = Get-AesSessionSecret -cipherText $script:tenantId

        Write-Verbose "Acquiring new access token"

        $resourceAppIdUri = 'https://api.securitycenter.microsoft.com'

        $oAuthUri = "https://login.microsoftonline.com/$ti/oauth2/token"

        $authBody = [Ordered] @{

          resource      = "$resourceAppIdUri"

          client_id     = "$ai"

          client_secret = "$as"

          grant_type    = 'client_credentials'

        }

        $authResponse = Invoke-RestMethod -Method Post -Uri $oAuthUri -Body $authBody -ErrorAction Stop

        $tc = $authResponse.access_token

        $script:tokenCache = New-AesSessionSecret -secret $tc

      }

      catch {

        Write-Error "Failed to acquire token"

      }

    }

    else {

      Write-Error 'Authorization info missing, have you executed Set-MdeAuthorizationInfo?'

      break

    }

  }

  return @{ Authorization = "Bearer $tc" }

}

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