Grant-YouTubeOauth.ps1

function Grant-YoutubeOauth {
  <#
  .SYNOPSIS
  Implementation of oAuth authentication for YouTube APIs.

  .PARAMETER BrowserCommand
  Use this parameter to override the command line to launch your browser (ie. chrome.exe, firefox, firefox.exe, chromium, etc.)
  #>
  [CmdletBinding()]
  param (
    [Parameter(Mandatory = $false)]
    [string] $BrowserCommand
  )

  $JobName = 'youtubetempwebserver'
  $null = Start-Job -Name $JobName -ScriptBlock {
    Start-PodeServer -ScriptBlock {
      Add-PodeEndpoint -Port 8000 -Protocol Http
      Add-PodeRoute -Method Get -Path /auth/complete -ScriptBlock {
        $Response = @'
        <h1 style="font-family: sans-serif;">Authentication Complete</h1>
        <h3 style="font-family: sans-serif;">You may close this browser window.</h3>
        <script>
          console.log(window.location.hash);
          let access_token_regex = /access_token=(?<access_token>.*?)&token_type/;
          let result = access_token_regex.exec(window.location.hash);
          fetch(`/auth/receive?access_token=${result.groups.access_token}`);
        </script>
'@
        Write-PodeHtmlResponse -Value $Response -StatusCode 200
      }

      Add-Poderoute -Method Get -Path /auth/receive -ScriptBlock{
        Out-PodeVariable -Name access_token -Value $WebEvent.Query['access_token']
        Close-PodeServer
      }
    }    
    $token = @{
      access_token = $access_token
    } 
    $token | ConvertTo-Json | Out-File -Path $HOME/.pwsh.youtube.oauth.json
  }

  $Client = Get-Content -Path $ConfigPath | ConvertFrom-Json
  $RedirectUri = 'http://localhost:8000/auth/complete'
  $ScopeList = @(
    'https://www.googleapis.com/auth/youtube'
    'https://www.googleapis.com/auth/youtube.force-ssl'
    'https://www.googleapis.com/auth/youtube.readonly'
  )
  $scopesURI = [System.Web.HttpUtility]::UrlEncode($ScopeList -join ' ')
  $Uri = 'https://accounts.google.com/o/oauth2/v2/auth?include_granted_scopes=true&response_type=token&client_id={0}&redirect_uri={1}&scope={2}&state={2}' -f $Client.client_id, $RedirectUri, ($scopesURI), (New-Guid).Guid

  $Browser = $BrowserCommand ? $BrowserCommand : (Find-Browser)
  Write-Verbose -Message ('Browser command line is: ' -f $Browser)
  Start-Process -FilePath $Browser -ArgumentList ('"{0}"' -f $Uri)
}