Private/Invoke-AuthorizationPKCEFlow.ps1
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class SpotifyToken { [string] $token [string[]] $scopes [datetime] $expiration } # reference: https://developer.spotify.com/documentation/web-api/tutorials/code-pkce-flow function Invoke-AuthorizationPKCEFlow { [CmdletBinding()] param ( [Parameter(Mandatory=$true)] [string[]] $Scopes, [Parameter(Mandatory=$false)] [string] $ClientId, [Parameter(Mandatory=$false)] [string] $RedirectURI, [ValidateScript({Test-Path $_})] [Parameter(Mandatory=$false)] [string] $ConfigFile ) # ensure we have required configuration value(s) $cId = Get-ClientId -Params $PSBoundParameters $rURI = Get-RedirectURI -Params $PSBoundParameters # generate code verifier $possible = [string[]][char[]]('ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789') $verifier = [String]::Join("", (Get-Random -Count 128 -InputObject $possible)) $bytes = [System.Text.Encoding]::UTF8.GetBytes($verifier) $hasher = [System.Security.Cryptography.SHA256]::Create() $hashBytes = $hasher.ComputeHash($bytes) #$hash = [System.BitConverter]::ToString($hashBytes).Replace('-','').ToLower() # https://stackoverflow.com/questions/63482575/ $b64hash = [System.Convert]::ToBase64String($hashBytes). Replace('=', ''). Replace('+', '-'). Replace('/', '_') # initiate flow $urlParams = @{ client_id = $cId response_type = 'code' redirect_uri = $rURI scope = [string]::Join(" ", $scopes) code_challenge_method = 'S256' code_challenge = $b64hash } $uParams = foreach ($param in $urlParams.Keys) { [string]::Format( "{0}={1}", $param, $urlParams.$param ) } $uri = [string]::Format("{0}?{1}", $script:AUTH_URI, [string]::Join("&", $uParams)) $params = @{ URI = $uri MaximumRedirection = 0 ErrorAction = 'SilentlyContinue' } if ($PSVersionTable.PSVersion.Major -gt 5) { $params.Add('SkipHttpErrorCheck', $true) } $response = Invoke-WebRequest @params $authPage = $response.Headers.Location[0] # prompt user to authenticate Start-Process $authPage Write-Information 'Opening authentication page in your web browser...' # start our listener to catch redirected code $srv = [System.Net.HttpListener]::New() if ($rURI[-1] -ne '/') { $rURI += '/' } try { $srv.Prefixes.Add($rURI) $srv.Start() $context = $srv.GetContext() $query = $context.Request.QueryString $response = $context.Response $response.StatusCode = 200 $response.ContentType = 'text/html' $data = '<html><head><script>window.close();</script></head><body>Hello! Goodbye!</body></html>' $buffer = [System.Text.Encoding]::UTF8.GetBytes($data) $response.ContentLength64 = $buffer.Length $response.OutputStream.Write($buffer, 0, $buffer.Length) $response.Close() $code = $query.Get('code') } finally { $srv.Close() } Write-Information "Authentication complete" # get access token $params = @{ URI = $script:TOKEN_URI Method = 'Post' ContentType = 'application/x-www-form-urlencoded' Body = @{ grant_type = 'authorization_code' code = $code redirect_uri = $rURI client_id = $cId code_verifier = $verifier } } try { $tokenResponse = (Invoke-WebRequest @params).Content | ConvertFrom-Json } catch { throw 'Failed to acquire access token' } $script:TOKENS.Add([SpotifyToken]@{ token = $tokenResponse.access_token scopes = $Scopes expiration = ([datetime]::Now).AddSeconds($tokenResponse.expires_in) }) | Out-Null return $tokenResponse.access_token } |