Public/Get-AccessToken.ps1
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<# .SYNOPSIS Gets an access token using the authorization code flow. .DESCRIPTION This function redeems an authorization code for an access token. .PARAMETER TokenUrl The token endpoint URL. .PARAMETER ClientId The client ID of the application. .PARAMETER ClientSecret The client secret of the application. Must be provided as a secure string. .PARAMETER RedirectUri The redirect URI provided in the authorization request. .PARAMETER Scope A space-separated list of scopes that you want the user to consent to. .PARAMETER GrantType The grant type of the token request. The following values are supported: "authorization_code", "client_credentials", "refresh_token", "urn:ietf:params:oauth:grant-type:device_code", "password". .PARAMETER AuthCode The authorization code provided by the authorization server. .PARAMETER CodeVerifier The code verifier used to generate the code challenge. .NOTES https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-auth-code-flow#redeem-a-code-for-an-access-token .EXAMPLE Get-AccessToken -TokenUrl $tokenUrl -ClientId $clientId -ClientSecret $clientSecret -RedirectUri $redirectUri -Scope $scope -AuthCode $authCode .EXAMPLE Get-AccessToken -TokenUrl $tokenUrl -ClientId $clientId -ClientSecret $clientSecret -GrantType "client_credentials" -Scope $scope .EXAMPLE Get-AccessToken -TokenUrl $tokenUrl -ClientId $clientId -ClientSecret $clientSecret -GrantType "refresh_token" -Scope $scope -RefreshToken $refreshToken #> function Get-AccessToken { param ( [cmdletbinding()] [Parameter(Mandatory)] [string]$TokenUrl, [Parameter(Mandatory)] [string]$ClientId, [Parameter(Mandatory)] [Validateset("authorization_code", "client_credentials", "refresh_token", "urn:ietf:params:oauth:grant-type:device_code", "password")] [string]$GrantType, [string]$RedirectUri, [securestring]$ClientSecret, [string]$AuthCode, [string]$Scope, [string]$CodeVerifier, [string]$DeviceCode ) $ContentType = "application/x-www-form-urlencoded" $tokenRequestBody = @{ client_id = $ClientId grant_type = $GrantType } switch ($GrantType) { "authorization_code" { $tokenRequestBody.Add("code", $AuthCode) $tokenRequestBody.Add("redirect_uri", $RedirectUri) $tokenRequestBody.Add("scope", $Scope) if ($CodeVerifier) { $tokenRequestBody.Add("code_verifier", $CodeVerifier) } # Confidential Client if ($ClientSecret) { $tokenRequestBody.Add("client_secret", (ConvertFrom-SecureString $ClientSecret -AsPlainText)) } } "client_credentials" { $tokenRequestBody.Add("client_secret", (ConvertFrom-SecureString $ClientSecret -AsPlainText)) $tokenRequestBody.Add("scope", $Scope) } "refresh_token" { } "urn:ietf:params:oauth:grant-type:device_code" { $tokenRequestBody.Add("device_code", $DeviceCode) } "password" { } Default {} } Write-Verbose ($tokenRequestBody | Out-String) $response = Invoke-RestMethod -Method Post -Uri $TokenUrl -ContentType $ContentType -Body $tokenRequestBody return $response } |