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.NET: Simplify Anthropic Foundry sample TokenCredential impl, removing unnecessary complexity. #2818

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.NET: Simplify Anthropic Foundry sample TokenCredential impl, removing unnecessary complexity. #2818

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33 changes: 6 additions & 27 deletions dotnet/samples/GettingStarted/AgentProviders/Agent_With_Anthropic/Program.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -36,39 +36,18 @@ namespace Sample
/// <summary>
/// Provides methods for invoking the Azure hosted Anthropic models using <see cref="TokenCredential"/> types.
/// </summary>
public sealed class AnthropicAzureTokenCredential : IAnthropicFoundryCredentials
public sealed class AnthropicAzureTokenCredential(TokenCredential tokenCredential, string resourceName) : IAnthropicFoundryCredentials
{
private readonly TokenCredential _tokenCredential;
private readonly Lock _lock = new();
private AccessToken? _cachedAccessToken;

/// <inheritdoc/>
public string ResourceName { get; }

/// <summary>
/// Creates a new instance of the <see cref="AnthropicAzureTokenCredential"/>.
/// </summary>
/// <param name="tokenCredential">The credential provider. Use any specialization of <see cref="TokenCredential"/> to get your access token in supported environments.</param>
/// <param name="resourceName">The service resource subdomain name to use in the anthropic azure endpoint</param>
internal AnthropicAzureTokenCredential(TokenCredential tokenCredential, string resourceName)
{
this.ResourceName = resourceName ?? throw new ArgumentNullException(nameof(resourceName));
this._tokenCredential = tokenCredential ?? throw new ArgumentNullException(nameof(tokenCredential));
}
public string ResourceName { get; } = resourceName;

/// <inheritdoc/>
public void Apply(HttpRequestMessage requestMessage)
{
lock (this._lock)
{
// Add a 5-minute buffer to avoid using tokens that are about to expire
if (this._cachedAccessToken is null || this._cachedAccessToken.Value.ExpiresOn <= DateTimeOffset.Now.AddMinutes(5))
{
this._cachedAccessToken = this._tokenCredential.GetToken(new TokenRequestContext(scopes: ["https://ai.azure.com/.default"]), CancellationToken.None);
}
}

requestMessage.Headers.Authorization = new AuthenticationHeaderValue("bearer", this._cachedAccessToken.Value.Token);
requestMessage.Headers.Authorization = new AuthenticationHeaderValue(
scheme: "bearer",
parameter: tokenCredential.GetToken(new TokenRequestContext(scopes: ["https://ai.azure.com/.default"]), CancellationToken.None)
.Token);
}
}
}
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