Delphi ActiveX Requires Chilkat v10.1.2+

SharePoint Rest API using OAuth

See more OAuth2 Examples

Demonstrates how to get an OAuth2 access token for the SharePoint REST API. Delphi ActiveX

var
success: Integer;
oauth2: TChilkatOAuth2;
url: WideString;
numMsWaited: Integer;

begin
success := 0;

//  To further clarify, see OAuth 2.0 Authorization Flow

oauth2 := TChilkatOAuth2.Create(Self);

//  The ListenPort should match the port in your localhost Reply URL of your Azure AD app.
//  Your Reply URL must be exactly "http://localhost:LISTEN_PORT/"
//     * Do not use "https"
//     * Make sure the ending "/" is included.
//     * You may choose any port number that doesn't collide with anything else.
oauth2.ListenPort := 3017;

oauth2.AuthorizationEndpoint := 'https://login.microsoftonline.com/TENANT_ID/oauth2/authorize';
oauth2.TokenEndpoint := 'https://login.windows.net/TENANT_ID/oauth2/token?api-version=1.0';

//  Replace these with actual values.
//  Use the application ID
oauth2.ClientId := 'CLIENT_ID';
//  Use the password
oauth2.ClientSecret := 'CLIENT_SECRET';

oauth2.CodeChallenge := 0;

oauth2.Scope := 'openid';
oauth2.Resource := 'https://graph.microsoft.com/';

oauth2.IncludeNonce := 1;
oauth2.ResponseMode := 'form_post';
oauth2.ResponseType := 'id_token+code';

//  Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
url := oauth2.StartAuth();
if (oauth2.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('url = ' + url);

//  Launch the default browser on the system and navigate to the url.
//  The LaunchBrowser method was added in Chilkat v10.1.2.
success := oauth2.LaunchBrowser(url);
if (success = 0) then
  begin
    Memo1.Lines.Add(oauth2.LastErrorText);
    Exit;
  end;

//  Wait for the user to approve or deny authorization in the browser.
numMsWaited := 0;
while (numMsWaited < 90000) and (oauth2.AuthFlowState < 3) do
  begin
    oauth2.SleepMs(100);
    numMsWaited := numMsWaited + 100;
  end;

//  If the browser does not respond within the specified time, AuthFlowState will be:
//  
//  1: Waiting for Redirect – The OAuth2 background thread is waiting for the browser's redirect request.
//  2: Waiting for Final Response – The thread is awaiting the final access token response.
//  In either case, cancel the background task initiated by StartAuth.

if (oauth2.AuthFlowState < 3) then
  begin
    oauth2.Cancel();
    Memo1.Lines.Add('No response from the browser!');
    Exit;
  end;

//  Check AuthFlowState to determine if authorization was granted, denied, or failed:
//  
//  3: Success – OAuth2 flow completed, the background thread exited, and the successful response is in AccessTokenResponse.
//  4: Access Denied – OAuth2 flow completed, the background thread exited, and the error response is in AccessTokenResponse.
//  5: Failure – OAuth2 flow failed before completion, the background thread exited, and error details are in FailureInfo.

if (oauth2.AuthFlowState = 5) then
  begin
    Memo1.Lines.Add('OAuth2 failed to complete.');
    Memo1.Lines.Add(oauth2.FailureInfo);
    Exit;
  end;

if (oauth2.AuthFlowState = 4) then
  begin
    Memo1.Lines.Add('OAuth2 authorization was denied.');
    Memo1.Lines.Add(oauth2.AccessTokenResponse);
    Exit;
  end;

if (oauth2.AuthFlowState <> 3) then
  begin
    Memo1.Lines.Add('Unexpected AuthFlowState:' + IntToStr(oauth2.AuthFlowState));
    Exit;
  end;

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