Delphi DLL

Vonage UC Extend Refresh Access Token

See more OAuth2 Examples

Refreshes the access token for Vonage UC Extend apps. Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, OAuth2, StringBuilder, JsonObject, CkDateTime;

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
jsonToken: HCkJsonObject;
oauth2: HCkOAuth2;
dtExpire: HCkDateTime;
sbJson: HCkStringBuilder;

begin
success := False;

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

// See Get Vonage UC Access Token 
// for sample code showing how to obtain a Vonage access token for desktop apps.

jsonToken := CkJsonObject_Create();
success := CkJsonObject_LoadFile(jsonToken,'qa_data/tokens/vonage_uc_extend.json');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load vonage_uc_extend.json');
    Exit;
  end;

oauth2 := CkOAuth2_Create();

CkOAuth2_putTokenEndpoint(oauth2,'https://api.vonage.com/token');

// Replace these with actual values.
CkOAuth2_putClientId(oauth2,'CLIENT_ID');
CkOAuth2_putClientSecret(oauth2,'CLIENT_SECRET');

// Get the "refresh_token"
CkOAuth2_putRefreshToken(oauth2,CkJsonObject__stringOf(jsonToken,'refresh_token'));

// Send the HTTP POST to refresh the access token..
CkOAuth2_putVerboseLogging(oauth2,True);
success := CkOAuth2_RefreshAccessToken(oauth2);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkOAuth2__lastErrorText(oauth2));
    Exit;
  end;

// Load the access token response into the json object 
CkJsonObject_Load(jsonToken,CkOAuth2__accessTokenResponse(oauth2));

// If an "expires_on" member does not exist, then add the JSON member by
// getting the current system date/time and adding the "expires_in" seconds.
// This way we'll know when the token expires.
if (CkJsonObject_HasMember(jsonToken,'expires_on') = False) then
  begin
    dtExpire := CkDateTime_Create();
    CkDateTime_SetFromCurrentSystemTime(dtExpire);
    CkDateTime_AddSeconds(dtExpire,CkJsonObject_IntOf(jsonToken,'expires_in'));
    CkJsonObject_AppendString(jsonToken,'expires_on',CkDateTime__getAsUnixTimeStr(dtExpire,False));
  end;

// Save the new JSON access token response to a file.
// The access + refresh tokens contained in this JSON will be needed for the next refresh.
sbJson := CkStringBuilder_Create();
CkJsonObject_putEmitCompact(jsonToken,False);
CkJsonObject_EmitSb(jsonToken,sbJson);
CkStringBuilder_WriteFile(sbJson,'qa_data/tokens/vonage_uc_extend.json','utf-8',False);

Memo1.Lines.Add('OAuth2 authorization granted!');
Memo1.Lines.Add('New Access Token = ' + CkOAuth2__accessToken(oauth2));

CkJsonObject_Dispose(jsonToken);
CkOAuth2_Dispose(oauth2);
    CkDateTime_Dispose(dtExpire);
CkStringBuilder_Dispose(sbJson);

end;