TOAuth2Authenticator: How to update an expired token?

Question

I'm missing something here!

I am trying to update an expired OAUTH2 token using a new one (new to me anyway from delphi xe2 environment). TOAuth2Authenticator, TRESTClient, TRESTRequest, TRESTResponse components

I set the following authentication properties with existing known values ​​for

• Clientid
• Clientsecret
• Region
• AccessTokenEndPoint
• AuthorizationEndPoint
• Redirection endpoint
• access token
• AccessTokenExpiry
• Refreshtoken

and can successfully access resources from the REST server until the token expires .

(, ), , , , , .

, / "RefreshExpiredToken", ?

: -)

Answer 1

, publicTOAuth2Authticator.ChangeAuthCodeToAccessToken, , , - :

LClient := TRestClient.Create(AccessTokenURI);
try
  LRequest := TRESTRequest.Create(LClient); // The LClient now "owns" the Request and will free it.
  LRequest.Method := TRESTRequestMethod.rmPOST;
  LSecretBase64 := String(SZFullEncodeBase64(AnsiString(<myClientID>+ ':' + <MyClientSecret>)));

  LRequest.AddAuthParameter('grant_type', 'refresh_token', TRESTRequestParameterKind.pkGETorPOST);
  LRequest.AddAuthParameter('refresh_token', _AccessRefreshToken, TRESTRequestParameterKind.pkGETorPOST);
  LRequest.AddAuthParameter('Authorization','Basic '+LSecretBase64, TRESTRequestParameterKind.pkHTTPHEADER, [TRESTRequestParameterOption.poDoNotEncode]  );


  LRequest.Execute;
  //Memo1.Lines.Add(LRequest.Response.Content);

  if LRequest.Response.GetSimpleValue('access_token', LToken) then
  begin
    _AccessToken := LToken;
  end;

  if LRequest.Response.GetSimpleValue('refresh_token', LToken) then
  begin
    _AccessRefreshToken := LToken;
    //Memo1.Lines.Add('RefreshExpiredToken: New Refresh Token Extracted');
  end;

  // detect token-type. this is important for how using it later
  if LRequest.Response.GetSimpleValue('token_type', LToken)
   then _TokenType := OAuth2TokenTypeFromString(LToken);

  // if provided by the service, the field "expires_in" contains
  // the number of seconds an access-token will be valid
  if LRequest.Response.GetSimpleValue('expires_in', LToken) then
  begin
    LIntValue := StrToIntdef(LToken, -1);
    if (LIntValue > -1) then
      _AccessTokenExpireDT := IncSecond(Now, LIntValue)
    else
      _AccessTokenExpireDT := 0.0;

    //Memo1.Lines.Add('RefreshExpiredToken: New Token Expires '+formatdatetime('hh:nn:ss dd/mm/yyyy', _AccessTokenExpireDT));
  end;


finally
  LClient.DisposeOf;
end;