(Delphi ActiveX) Docusign Refresh OAuth2 Access Token

See more DocuSign Examples

Demonstrates how to refresh a Docusign OAuth2 access token. The refresh does not require user interaction via a web browser. If an access token expires (typically with a 401 response code), a new access token can be automatically obtained by using the code in this example.

For more information, see https://developers.docusign.com/esign-rest-api/guides/authentication/oauth2-code-grant

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
jsonToken: TChilkatJsonObject;
success: Integer;
oauth2: TChilkatOAuth2;
sbJson: TChilkatStringBuilder;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// It is assumed we previously obtained an OAuth2 access token.
// This example loads the JSON access token file 
// saved by this example: Get Docusign OAuth2 Access Token

jsonToken := TChilkatJsonObject.Create(Self);
success := jsonToken.LoadFile('qa_data/tokens/docusign.json');
if (success <> 1) then
  begin
    Memo1.Lines.Add('Failed to load docusign.json');
    Exit;
  end;

// The access token JSON looks like this:

// {
//   "access_token": "eyJ0eXA....YQyig",
//   "token_type": "Bearer",
//   "refresh_token": "eyJ0eXA....auE3eHKg",
//   "expires_in": 28800
// }

oauth2 := TChilkatOAuth2.Create(Self);

// For the developer sandbox environment, the token endpoint is https://account-d.docusign.com/oauth/token
// For the production platform, the token endpoint is https://account.docusign.com/oauth/token
oauth2.TokenEndpoint := 'https://account-d.docusign.com/oauth/token';

// Replace these with actual values.
// The client ID is also known as the "integration key" in Docusign.
oauth2.ClientId := 'MY_DOCUSIGN_CLIENT_ID';
// This is your secret key for the authorization code grant.
oauth2.ClientSecret := 'MY_DOCUSIGN_CLIENT_SECRET';

// Get the "refresh_token"
oauth2.RefreshToken := jsonToken.StringOf('refresh_token');

// Send the HTTP POST to refresh the access token..
success := oauth2.RefreshAccessToken();
if (success <> 1) then
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('New access token: ' + oauth2.AccessToken);
Memo1.Lines.Add('New refresh token: ' + oauth2.RefreshToken);

// Update the JSON with the new tokens.
jsonToken.UpdateString('access_token',oauth2.AccessToken);
jsonToken.UpdateString('refresh_token',oauth2.RefreshToken);

// Save the new JSON access token response to a file.
sbJson := TChilkatStringBuilder.Create(Self);
jsonToken.EmitCompact := 0;
jsonToken.EmitSb(sbJson.ControlInterface);
sbJson.WriteFile('qa_data/tokens/docusign.json','utf-8',0);

Memo1.Lines.Add('OAuth2 authorization granted!');
Memo1.Lines.Add('New Access Token = ' + oauth2.AccessToken);
end;