(Java) Test Salesforce OAuth2 Access Token

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // This example does the following:

    // curl -X GET https://yourInstance.salesforce.com/services/oauth2/userinfo \
    //      -H "Authorization: Bearer YOUR_ACCESS_TOKEN"

    CkHttp http = new CkHttp();

    // Use the following online tool to generate HTTP code from a CURL command
    // Convert a cURL Command to HTTP Source Code

    // This example assumes the OAuth2 access token was previously fetched 
    // and saved to a file.  See Get SalesForce OAuth2 Access Token via Authorization Flow

    CkJsonObject json = new CkJsonObject();
    boolean success = json.LoadFile("qa_data/tokens/_salesforce.json");
    if (success == false) {
        System.out.println("Failed to load OAuth2 access token.");
        return;
        }

    // Here's an example of the JSON:

    // {
    //   "access_token": "00D41000....uLZBpT6",
    //   "refresh_token": "5Aep....25xdGgkrV",
    //   "signature": "cjTbSc5DvcKpaMoRTzuQTJLb1tcMw8LEO01flq4aMD4=",
    //   "scope": "refresh_token id",
    //   "instance_url": "https://d41000000f8a0eak-dev-ed.my.salesforce.com",
    //   "id": "https://login.salesforce.com/id/00D41000000F8A0EAK/005410000....xAAE",
    //   "token_type": "Bearer",
    //   "issued_at": "1738348388166"
    // }

    // Adds the "Authorization: Bearer YOUR_ACCESS_TOKEN" header.
    http.put_AuthToken(json.stringOf("access_token"));

    // We want to build the following URL:  https://<instance_id>.salesforce.com/services/oauth2/userinfo
    CkStringBuilder sbUrl = new CkStringBuilder();
    sbUrl.Append(json.stringOf("instance_url"));
    sbUrl.Append("/services/oauth2/userinfo");

    CkStringBuilder sbResponseBody = new CkStringBuilder();
    success = http.QuickGetSb(sbUrl.getAsString(),sbResponseBody);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("Response status code = " + http.get_LastStatus());

    CkJsonObject jsonResponse = new CkJsonObject();
    jsonResponse.LoadSb(sbResponseBody);
    jsonResponse.put_EmitCompact(false);
    System.out.println(jsonResponse.emit());

    // The expected JSON response is something like this:

    // {
    //   "sub": "005xxxxxxxxxxxx",
    //   "name": "John Doe",
    //   "preferred_username": "johndoe@example.com",
    //   "email": "johndoe@example.com",
    //   "profile": "https://na85.salesforce.com/005xxxxxxxxxxxx"
    // ...
    // ...
    // }
  }
}