(Delphi ActiveX) curl with OAuth2 Client Credentials

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This example shows how to run a simple CURL command with an OAuth2 access token for authorization. We use CURL to retrieve a SharePoint site ID, and Chilkat automatically fetches the OAuth2 access token using the provided credentials.

Note: This example requires Chilkat v11.5.0 or greater.

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* 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
success: Integer;
sb: TChilkatStringBuilder;
jsonOAuth2: TChilkatJsonObject;
httpCurl: TChilkatHttpCurl;
responseJson: TChilkatJsonObject;
statusCode: Integer;

begin
success := 0;

// This example will run the following curl command

// curl -X GET "https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}" \
//   -H "Authorization: Bearer ACCESS_TOKEN" \
//   -H "Accept: application/json"

sb := TChilkatStringBuilder.Create(Self);
sb.AppendLn('curl -X GET "https://graph.microsoft.com/v1.0/sites/{{sharepoint_hostname}}:/sites/{{site_name}}" \");
sb.AppendLn('  -H "Authorization: Bearer ACCESS_TOKEN" \");
sb.AppendLn('  -H "Accept: application/json"');

// Build the JSON that provides information for getting the OAuth2 access token using the OAuth2 client credentials flow.
jsonOAuth2 := TChilkatJsonObject.Create(Self);

jsonOAuth2.UpdateString('oauth2.client_id','CLIENT_ID');
jsonOAuth2.UpdateString('oauth2.client_secret','CLIENT_SECRET');
jsonOAuth2.UpdateString('oauth2.scope','https://graph.microsoft.com/.default');
jsonOAuth2.UpdateString('oauth2.token_endpoint','https://login.microsoftonline.com/TENANT_ID/oauth2/v2.0/token');

httpCurl := TChilkatHttpCurl.Create(Self);

// Provide the information for getting the OAuth2 access token from the token endpoint
// Note: The Authorization header specified in the curl command will be ignored and replaced using the OAuth2 access token obtained at runtime from the token endpoint.
httpCurl.SetAuth(jsonOAuth2.ControlInterface);

// The placeholders {{sharepoint_hostname}} and {{site_name}} represent variables that must be defined before execution.
// When DoYourThing runs the curl command, it automatically substitutes these placeholders with their corresponding values.
// Below are the values assigned to these variables:
httpCurl.SetVar('sharepoint_hostname','example.sharepoint.com');
httpCurl.SetVar('site_name','test');

// Run the curl command.
success := httpCurl.DoYourThing(sb.GetAsString());
if (success = 0) then
  begin
    Memo1.Lines.Add(httpCurl.LastErrorText);
    Exit;
  end;

responseJson := TChilkatJsonObject.Create(Self);
responseJson.EmitCompact := 0;

httpCurl.GetResponseJson(responseJson.ControlInterface);

statusCode := httpCurl.StatusCode;
Memo1.Lines.Add('response status code: ' + IntToStr(statusCode));

Memo1.Lines.Add(responseJson.Emit());
end;