C#

Get OAuth2 Access Token for Azure Registered App

See more OAuth2 Examples

Demonstrates how to get OAuth2 access token for an Azure Registered App from a desktop application or script. This example demonstrates the OAuth2 authorization flow.

This example requires Chilkat v10.1.2 or greater.

C#

bool success = false;

//  To further clarify, see OAuth 2.0 Authorization Flow

Chilkat.OAuth2 oauth2 = new Chilkat.OAuth2();

//  This should be the port in the localhost callback URL for your app.  
//  The callback URL would look like "http://localhost:3017/" if the port number is 3017.
oauth2.ListenPort = 3017;

//  ----------------------------------------------------------------------------------------------------------
//  The screenshot at the bottom of this page shows how we created the Azure App Registration for this example.
//  ----------------------------------------------------------------------------------------------------------

//  Note: The endpoint depends on the Azure App Registration.
//  See How to Choose the Correct Endpoints for your Azure App Registration
oauth2.AuthorizationEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/authorize";
oauth2.TokenEndpoint = "https://login.microsoftonline.com/common/oauth2/v2.0/token";

//  Replace these with actual values.
oauth2.ClientId = "CLIENT_ID";

//  This is for Require Proof Key for Code Exchange (PKCE)
//  See OAuth2 PKCE Explained
oauth2.CodeChallenge = true;
oauth2.CodeChallengeMethod = "S256";

//  Provide a SPACE separated list of scopes.
//  See https://developer.microsoft.com/en-us/graph/docs/authorization/permission_scopes 

//  Important: To get a refresh token in the final response, ask for "offline_access" scope
oauth2.Scope = "openid profile offline_access user.readwrite mail.readwrite mail.send files.readwrite";

//  Begin the OAuth2 three-legged flow.  This returns a URL that should be loaded in a browser.
string url = oauth2.StartAuth();
if (oauth2.LastMethodSuccess != true) {
    Debug.WriteLine(oauth2.LastErrorText);
    return;
}

//  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) {
    Debug.WriteLine(oauth2.LastErrorText);
    return;
}

//  Wait for the user to approve or deny authorization in the browser.
int numMsWaited = 0;
while ((numMsWaited < 90000) && (oauth2.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.AuthFlowState < 3) {
    oauth2.Cancel();
    Debug.WriteLine("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.AuthFlowState == 5) {
    Debug.WriteLine("OAuth2 failed to complete.");
    Debug.WriteLine(oauth2.FailureInfo);
    return;
}

if (oauth2.AuthFlowState == 4) {
    Debug.WriteLine("OAuth2 authorization was denied.");
    Debug.WriteLine(oauth2.AccessTokenResponse);
    return;
}

if (oauth2.AuthFlowState != 3) {
    Debug.WriteLine("Unexpected AuthFlowState:" + Convert.ToString(oauth2.AuthFlowState));
    return;
}

Debug.WriteLine("OAuth2 authorization granted!");
Debug.WriteLine("Access Token = " + oauth2.AccessToken);

//  When the token is near expiration, your app can refresh as shown here:
//  Refresh Expiring OAuth2 Access Token for Azure Registered App

//  Get the full JSON response:
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(oauth2.AccessTokenResponse);
json.EmitCompact = false;

//  The JSON response looks like this:

//  {
//    "token_type": "Bearer",
//    "scope": "User.Read Mail.ReadWrite Mail.Send",
//    "expires_in": 3600,
//    "ext_expires_in": 0,
//    "access_token": "EwBAA8l6B...",
//    "refresh_token": "MCRMdbe...",
//    "id_token": "eyJ0eXA..."
//  }

//  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) {
    Chilkat.CkDateTime dtExpire = new Chilkat.CkDateTime();
    dtExpire.SetFromCurrentSystemTime();
    dtExpire.AddSeconds(json.IntOf("expires_in"));
    json.AppendString("expires_on",dtExpire.GetAsUnixTimeStr(false));
}

Debug.WriteLine(json.Emit());

//  Save the JSON to a file for future requests.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
fac.WriteEntireTextFile("qa_data/tokens/_myAzureApp.json",json.Emit(),"utf-8",false);

//  This is a screenshot of how we created the Azure App for this example:
//