function to obtain the access token using delegated access to microsoft graph in javascript

To obtain an access token by using delegated access to Microsoft Graph, you can use the ADAL.js library, which provides a simple way to acquire an access token. Here is an example function that you can use to obtain an access token using delegated access:


index.tsx
// Define the required parameters for the acquireToken function
var config = {
  clientId: '<your_client_id>',
  redirectUri: window.location.origin + '/',
  tenant: '<your_tenant_id>',
  endpoints: {
    graphApiUri: 'https://graph.microsoft.com'
  }
};

// Create a new UserAgentApplication object
var authContext = new window.AuthenticationContext(config);

// Define the function to acquire an access token using delegated access
function getAccessToken(callback) {
  // Use the acquireToken function to obtain an access token
  authContext.acquireToken(
    config.endpoints.graphApiUri,
    function (error, token) {
      if (error || !token) {
        // Handle the error
        console.log('Error acquiring access token:', error);
        callback(null);
      } else {
        // Return the access token
        callback(token);
      }
    }
  );
}

// Call the getAccessToken function to obtain an access token
getAccessToken(function (token) {
  console.log('Access token:', token);
});
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In this example, the config object contains the required parameters for the acquireToken function, including the client ID, redirect URI, tenant ID, and API endpoint URI. Note that the endpoints property specifies the URI for the Microsoft Graph API.

The authContext variable creates a new AuthenticationContext object, which is used to acquire an access token.

The getAccessToken function uses the acquireToken function to obtain an access token for the Graph API endpoint. If an error occurs, the function logs an error message to the console and passes null to the callback function. If no error occurs, the function passes the access token to the callback function.

Finally, the getAccessToken function is called to obtain an access token and log it to the console.

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