(Java) Dynamics CRM OAuth2 Access Token

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Demonstrates how to get a Microsoft Dynamics CRM OAuth2 access token from a desktop (installed) application or script.

Note: This example requires Chilkat v10.1.2 or greater.

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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[])
  {
    // To further clarify, see OAuth 2.0 Authorization Flow

    CkOAuth2 oauth2 = new CkOAuth2();

    // This should be the port in the localhost redirect URL for your app.
    // Important: Make sure the redirect URI in your Azure app registration 
    // is exactly "http://localhost:3017/".  Don't forget the ending "/" char.
    // The redirect URL would look like "http://localhost:3017/" if the port number is 3017.
    oauth2.put_ListenPort(3017);

    // Get the endpoints from the Azure Portal in the "endpoints" section of App Registrations..
    // The DYNAMICS-ENDPOINT-GUID is a Tenant dynamics-endpoint-guid  such as 1b54e7ee-d61b-4f12-a621-a6b2805b98c2
    oauth2.put_AuthorizationEndpoint("https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/authorize");
    oauth2.put_TokenEndpoint("https://login.microsoftonline.com/DYNAMICS-ENDPOINT-GUID/oauth2/token");

    // Replace these with actual values.
    oauth2.put_ClientId("DYNAMICS-CRM-CLIENT-ID");
    oauth2.put_ClientSecret("DYNAMICS-CRM-SECRET-KEY");

    oauth2.put_Resource("https://mydynamicsdomain.api.crm.dynamics.com");

    oauth2.put_RedirectAllowHtml("<html><body><p>Thank you for granting access.</p></bod></html>");
    oauth2.put_RedirectDenyHtml("<html><body><p>Maybe next time...</p></bod></html>");

    // Begin the OAuth2 Authorization code flow.  This returns a URL that should be loaded in a browser.
    String url = oauth2.startAuth();
    if (oauth2.get_LastMethodSuccess() != true) {
        System.out.println(oauth2.lastErrorText());
        return;
        }

    // We can pre-check the URL by sending a GET to catch any up-front errors.
    // If we receive JSON with an error in response, then we don't proceed any farther.

    // If we receive an HTML response, and the response status = 200, then all should be OK.
    // We can proceed by displaying an interactive browser loaded with the url.
    CkHttp http = new CkHttp();
    CkStringBuilder sbPreCheck = new CkStringBuilder();
    boolean success = http.QuickGetSb(url,sbPreCheck);
    if ((http.get_LastStatus() != 200) || (sbPreCheck.StartsWith("{",true) != true)) {
        System.out.println("JSON Error Response:");
        System.out.println(sbPreCheck.getAsString());
        return;
        }

    // If the HTTP request itself failed, then examine the error.
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    // OK.. the pre-flight check seems OK, go ahead with getting the interactive user authorization..

    // 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 == false) {
        System.out.println(oauth2.lastErrorText());
        return;
        }

    // Wait for the user to approve or deny authorization in the browser.
    int numMsWaited = 0;
    while ((numMsWaited < 90000) && (oauth2.get_AuthFlowState() < 3)) {
        oauth2.SleepMs(100);
        numMsWaited = numMsWaited+100;
        }

    // 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.get_AuthFlowState() < 3) {
        oauth2.Cancel();
        System.out.println("No response from the browser!");
        return;
        }

    // 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.get_AuthFlowState() == 5) {
        System.out.println("OAuth2 failed to complete.");
        System.out.println(oauth2.failureInfo());
        return;
        }

    if (oauth2.get_AuthFlowState() == 4) {
        System.out.println("OAuth2 authorization was denied.");
        System.out.println(oauth2.accessTokenResponse());
        return;
        }

    if (oauth2.get_AuthFlowState() != 3) {
        System.out.println("Unexpected AuthFlowState:" + oauth2.get_AuthFlowState());
        return;
        }

    System.out.println("OAuth2 authorization granted!");
    System.out.println("Access Token = " + oauth2.accessToken());

    // Get the full JSON response:
    CkJsonObject json = new CkJsonObject();
    json.Load(oauth2.accessTokenResponse());
    json.put_EmitCompact(false);

    // The JSON response looks like this:

    // {
    //   "token_type": "Bearer",
    //   "scope": "user_impersonation",
    //   "expires_in": "3599",
    //   "ext_expires_in": "0",
    //   "expires_on": "1524783438",
    //   "not_before": "1524779538",
    //   "resource": "https://mydomain.api.crm.dynamics.com",
    //   "access_token": "...",
    //   "refresh_token": "...",
    //   "id_token": "..."
    // }

    // If an "expires_on" member does not exist, then add the JSON member by
    // getting the current system date/time and adding the "expires_in" seconds.
    // This way we'll know when the token expires.
    if (json.HasMember("expires_on") != true) {
        CkDateTime dtExpire = new CkDateTime();
        dtExpire.SetFromCurrentSystemTime();
        dtExpire.AddSeconds(json.IntOf("expires_in"));
        json.AppendString("expires_on",dtExpire.getAsUnixTimeStr(false));
        }

    System.out.println(json.emit());

    // Save the JSON to a file for future requests.
    CkFileAccess fac = new CkFileAccess();
    fac.WriteEntireTextFile("qa_data/tokens/dynamicsCrm.json",json.emit(),"utf-8",false);
  }
}