microsoft/healthcare-shared-components
Publicmirrored from https://github.com/microsoft/healthcare-shared-componentsAvailable
src/Microsoft.Health.Client/Authentication/ManagedIdentityCredentialProvider.cs
44lines · modecode
| 1 | // ------------------------------------------------------------------------------------------------- |
| 2 | // Copyright (c) Microsoft Corporation. All rights reserved. |
| 3 | // Licensed under the MIT License (MIT). See LICENSE in the repo root for license information. |
| 4 | // ------------------------------------------------------------------------------------------------- |
| 5 | |
| 6 | using System.Threading; |
| 7 | using System.Threading.Tasks; |
| 8 | using Azure.Core; |
| 9 | using Azure.Identity; |
| 10 | using EnsureThat; |
| 11 | using Microsoft.Extensions.Options; |
| 12 | |
| 13 | namespace Microsoft.Health.Client.Authentication; |
| 14 | |
| 15 | public class ManagedIdentityCredentialProvider : CredentialProvider |
| 16 | { |
| 17 | private readonly IOptionsMonitor<ManagedIdentityCredentialOptions> _managedIdentityCredentialOptionsMonitor; |
| 18 | private readonly string _optionsName; |
| 19 | |
| 20 | /// <summary> |
| 21 | /// Initializes a new instance of the <see cref="ManagedIdentityCredentialProvider"/> class. |
| 22 | /// This class is used to obtain a token for the configured resource via Managed Identity. |
| 23 | /// </summary> |
| 24 | /// <param name="managedIdentityCredentialOptionsMonitor">The configuration of the token to obtain.</param> |
| 25 | /// <param name="optionsName">Optional name to use when retrieving options from the IOptionsMonitor</param> |
| 26 | public ManagedIdentityCredentialProvider(IOptionsMonitor<ManagedIdentityCredentialOptions> managedIdentityCredentialOptionsMonitor, string optionsName = null) |
| 27 | { |
| 28 | EnsureArg.IsNotNull(managedIdentityCredentialOptionsMonitor, nameof(managedIdentityCredentialOptionsMonitor)); |
| 29 | |
| 30 | _managedIdentityCredentialOptionsMonitor = managedIdentityCredentialOptionsMonitor; |
| 31 | _optionsName = optionsName; |
| 32 | } |
| 33 | |
| 34 | protected override async Task<string> BearerTokenFunction(CancellationToken cancellationToken) |
| 35 | { |
| 36 | ManagedIdentityCredentialOptions options = _managedIdentityCredentialOptionsMonitor.Get(_optionsName); |
| 37 | ManagedIdentityId id = string.IsNullOrEmpty(options.ClientId) ? ManagedIdentityId.SystemAssigned : ManagedIdentityId.FromUserAssignedClientId(options.ClientId); |
| 38 | ManagedIdentityCredential credential = new(id); |
| 39 | |
| 40 | TokenRequestContext requestContext = new(scopes: [options.Resource], tenantId: options.TenantId); |
| 41 | AccessToken accessToken = await credential.GetTokenAsync(requestContext, cancellationToken).ConfigureAwait(false); |
| 42 | return accessToken.Token; |
| 43 | } |
| 44 | } |
| 45 | |