public static async Task <ActiveDirectoryClient> GetGraphClientAsync()
{
//Check to see if this client has already been created. If so, return it. Otherwise, create a new one.
if (_graphClient != null)
{
Debug.WriteLine("Got a Graph client for Users and Groups.");
return(_graphClient);
}
else
{
// Active Directory service endpoints
const string AadServiceResourceId = "https://graph.windows.net/";
Uri AadServiceEndpointUri = new Uri("https://graph.windows.net/");
try
{
//First, look for the authority used during the last authentication.
//If that value is not populated, use _commonAuthority.
string authority = null;
if (String.IsNullOrEmpty(AuthenticationHelper.LastAuthority))
{
authority = AuthenticationHelper.CommonAuthority;
}
else
{
authority = AuthenticationHelper.LastAuthority;
}
// Create an AuthenticationContext using this authority.
AuthenticationHelper._authenticationContext = new AuthenticationContext(authority);
var token = await AuthenticationHelper.GetTokenHelperAsync(AuthenticationHelper._authenticationContext, AadServiceResourceId);
// Check the token
if (String.IsNullOrEmpty(token))
{
// User cancelled sign-in
return(null);
}
else
{
// Create our ActiveDirectory client.
_graphClient = new ActiveDirectoryClient(
new Uri(AadServiceEndpointUri, AuthenticationHelper.TenantId),
async() => await AuthenticationHelper.GetTokenHelperAsync(AuthenticationHelper._authenticationContext, AadServiceResourceId));
Debug.WriteLine("Got a Graph client for Users and Groups.");
return(_graphClient);
}
}
catch (Exception)
{
// Argument exception
}
AuthenticationHelper._authenticationContext.TokenCache.Clear();
return(null);
}
}
/// <summary>
/// Checks that an OutlookServicesClient object is available.
/// </summary>
/// <returns>The OutlookServicesClient object. </returns>
public static async Task <OutlookServicesClient> GetOutlookClientAsync()
{
if (_outlookClient != null && !String.IsNullOrEmpty(AuthenticationHelper.LastAuthority))
{
Debug.WriteLine("Got an Outlook client for Mail.");
return(_outlookClient);
}
else
{
try
{
//First, look for the authority used during the last authentication.
//If that value is not populated, use CommonAuthority.
string authority = null;
if (String.IsNullOrEmpty(AuthenticationHelper.LastAuthority))
{
authority = AuthenticationHelper.CommonAuthority;
}
else
{
authority = AuthenticationHelper.LastAuthority;
}
// Create an AuthenticationContext using this authority.
AuthenticationHelper._authenticationContext = new AuthenticationContext(authority);
// Set the value of _authenticationContext.UseCorporateNetwork to true so that you
// can use this app inside a corporate intranet. If the value of UseCorporateNetwork
// is true, you also need to add the Enterprise Authentication, Private Networks, and
// Shared User Certificates capabilities in the Package.appxmanifest file.
AuthenticationHelper._authenticationContext.UseCorporateNetwork = true;
//See the Discovery Service Sample (https://github.com/OfficeDev/Office365-Discovery-Service-Sample)
//for an approach that improves performance by storing the discovery service information in a cache.
DiscoveryClient discoveryClient = new DiscoveryClient(
async() => await AuthenticationHelper.GetTokenHelperAsync(AuthenticationHelper._authenticationContext, AuthenticationHelper.DiscoveryResourceId));
// Get the specified capability ("Calendar").
CapabilityDiscoveryResult result =
await discoveryClient.DiscoverCapabilityAsync("Mail");
var token = await AuthenticationHelper.GetTokenHelperAsync(AuthenticationHelper._authenticationContext, result.ServiceResourceId);
// Check the token
if (String.IsNullOrEmpty(token))
{
// User cancelled sign-in
return(null);
}
else
{
_outlookClient = new OutlookServicesClient(
result.ServiceEndpointUri,
async() => await AuthenticationHelper.GetTokenHelperAsync(AuthenticationHelper._authenticationContext, result.ServiceResourceId));
Debug.WriteLine("Got an Outlook client for Mail.");
return(_outlookClient);
}
}
// The following is a list of exceptions you should consider handling in your app.
// In the case of this sample, the exceptions are handled by returning null upstream.
catch (DiscoveryFailedException dfe)
{
Debug.WriteLine(dfe.Message);
}
catch (ArgumentException ae)
{
Debug.WriteLine(ae.Message);
}
AuthenticationHelper._authenticationContext.TokenCache.Clear();
return(null);
}
}
