(C# UWP/WinRT) Get an Azure AD Access Token

Demonstrates how to obtain an Azure AD access token for authentication using a client ID, client secret, and tenant ID.

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Socket socket = new Chilkat.Socket();

// Make a TLS connection to login.microsoftonline.com, waiting at most 5000 milliseconds.
bool success = await socket.ConnectAsync("login.microsoftonline.com",443,true,5000);
if (success != true) {
    Debug.WriteLine(socket.LastErrorText);
    return;
}

// Create an Azure AD auth object, and provide the required information for authorization.
Chilkat.AuthAzureAD azureAD = new Chilkat.AuthAzureAD();
azureAD.ClientId = "AZURE_AD_CLIENT_ID";
azureAD.ClientSecret = "AZURE_AD_CLIENT_SECRET";
azureAD.TenantId = "AZURE_TENANT_ID";

azureAD.Resource = "https://outlook.office365.com/";

// Retrieve the access token using the TLS connection to login.microsoftonline.com
success = await azureAD.ObtainAccessTokenAsync(socket);
if (success != true) {
    Debug.WriteLine(socket.LastErrorText);
    return;
}

// Show the access token, and then save it to a JSON file
// for future use (such as with a REST method call).
Debug.WriteLine("Azure AD Access Token = " + azureAD.AccessToken);

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.AppendString("accessToken",azureAD.AccessToken);

// Save our access token to a file.  It will be used in subsequent REST API calls.
Chilkat.FileAccess fac = new Chilkat.FileAccess();
fac.WriteEntireTextFile("qa_data/tokens/azureAD_office365.json",json.Emit(),"utf-8",false);

// Let's get the id information out of the access token.
// Our JSON looks like this:
// {"accessToken":"eyJ0eXAiO---TdjT3RjIn0.eyJhdWQiOiJo---jEuMCJ9.CIx0sUT8s---KvzKKUw"}

// I used "---" instead of "..." to indicate a large quantity of omitted chars.
// The accessToken is a long string composed of 3 base64 strings concatenated with "." chars.
// The 1st part is the JOSE header.  If you decode from base64, you'll get the JSON JOSE header.
// The 2nd part is the id token.  When decoded this is the JSON that contains information about the authenticated application.
// The 3rd part is binary and does not decode to JSON.

// Let's get the information from the 2nd part (the id token)
Chilkat.StringArray sa = new Chilkat.StringArray();
sa.SplitAndAppend(json.StringOf("accessToken"),".");

Chilkat.StringBuilder sbIdToken = new Chilkat.StringBuilder();
// The 2nd string is at index 1.
sbIdToken.Append(sa.GetString(1));
sbIdToken.Decode("base64","utf-8");

Chilkat.JsonObject jsonIdToken = new Chilkat.JsonObject();
jsonIdToken.LoadSb(sbIdToken);
jsonIdToken.EmitCompact = false;
Debug.WriteLine(jsonIdToken.Emit());

// We have something like this:
// {
//   "aud": "https://outlook.office365.com/",
//   "iss": "https://sts.windows.net/6e8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/",
//   "iat": 1586350465,
//   "nbf": 1586350465,
//   "exp": 1586354365,
//   "aio": "42dgYNjyOtX8ZZB7JLfMFJGeKUmvAA==",
//   "app_displayname": "ChilkatTest",
//   "appid": "f125d695-c50e-456e-a578-a486f06d1213",
//   "appidacr": "1",
//   "idp": "https://sts.windows.net/6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd/",
//   "oid": "7545a2fd-3f0d-48a4-9c58-a1a5700a24b1",
//   "sid": "ab981252-9378-4d0c-964b-eb2e1451138f",
//   "sub": "7546a2fc-3f0d-48a4-9c58-a1a5700a24b1",
//   "tid": "6d8ddd66-68d1-43b0-af5c-e31b4b7dd5cd",
//   "uti": "huIJBAa1tvGpczwV5S1BAA",
//   "ver": "1.0"
// }

// Get the desired information from the JSON:
string aud = jsonIdToken.StringOf("aud");
string iss = jsonIdToken.StringOf("iss");
int iat = jsonIdToken.IntOf("iat");
int nbf = jsonIdToken.IntOf("nbf");
int exp = jsonIdToken.IntOf("exp");
string aio = jsonIdToken.StringOf("aio");
string app_displayname = jsonIdToken.StringOf("app_displayname");
string appid = jsonIdToken.StringOf("appid");
string appidacr = jsonIdToken.StringOf("appidacr");
string idp = jsonIdToken.StringOf("idp");
string oid = jsonIdToken.StringOf("oid");
string sid = jsonIdToken.StringOf("sid");
string sub = jsonIdToken.StringOf("sub");
string tid = jsonIdToken.StringOf("tid");
string uti = jsonIdToken.StringOf("uti");
string ver = jsonIdToken.StringOf("ver");