Delphi DLL Requires Chilkat v11.0.0+

Group: Refresh OAuth2 Access Token

See more Microsoft Group Examples

Refreshes an expired or non-expired OAuth2 access token for the Microsoft Group REST API. Delphi DLL

var
success: Boolean;
json: HCkJsonObject;
req: HCkHttpRequest;
http: HCkHttp;
resp: HCkHttpResponse;
fac: HCkFileAccess;

begin
success := False;

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

json := CkJsonObject_Create();
success := CkJsonObject_LoadFile(json,'qa_data/tokens/msGraphGroup.json');
if (success <> True) then
  begin
    Exit;
  end;

req := CkHttpRequest_Create();
CkHttpRequest_AddParam(req,'grant_type','refresh_token');
CkHttpRequest_AddParam(req,'redirect_uri','http://localhost:3017/');
CkHttpRequest_AddParam(req,'client_id','MICROSOFT-GRAPH-CLIENT-ID');
CkHttpRequest_AddParam(req,'client_secret','MICROSOFT-GRAPH-CLIENT-SECRET');
CkHttpRequest_AddParam(req,'refresh_token',CkJsonObject__stringOf(json,'refresh_token'));
CkHttpRequest_AddParam(req,'scope','openid profile offline_access user.readwrite group.readwrite.all files.readwrite');

http := CkHttp_Create();

CkHttpRequest_putHttpVerb(req,'POST');
CkHttpRequest_putContentType(req,'application/x-www-form-urlencoded');

resp := CkHttpResponse_Create();
success := CkHttp_HttpReq(http,'https://login.microsoftonline.com/common/oauth2/v2.0/token',req,resp);
if (success = False) then
  begin
    Memo1.Lines.Add(CkHttp__lastErrorText(http));
    Exit;
  end;

//  Load the JSON response.
CkJsonObject_Load(json,CkHttpResponse__bodyStr(resp));
CkJsonObject_putEmitCompact(json,False);

//  Show the JSON response.
Memo1.Lines.Add(CkJsonObject__emit(json));

Memo1.Lines.Add('Response status code: ' + IntToStr(CkHttpResponse_getStatusCode(resp)));

//  If the response status code is not 200, then it's an error.
if (CkHttpResponse_getStatusCode(resp) <> 200) then
  begin
    Exit;
  end;

//  Save the refreshed access token JSON to a file for future requests.
fac := CkFileAccess_Create();
CkFileAccess_WriteEntireTextFile(fac,'qa_data/tokens/msGraphGroup.json',CkJsonObject__emit(json),'utf-8',False);

Memo1.Lines.Add('Success.');

CkJsonObject_Dispose(json);
CkHttpRequest_Dispose(req);
CkHttp_Dispose(http);
CkHttpResponse_Dispose(resp);
CkFileAccess_Dispose(fac);