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| 1 | +// Copyright � 2025-Present the a2a-net Authors |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"), |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 7 | +// |
| 8 | +// Unless required by applicable law or agreed to in writing, software |
| 9 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 10 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 11 | +// See the License for the specific language governing permissions and |
| 12 | +// limitations under the License. |
| 13 | + |
| 14 | +namespace A2A.Client; |
| 15 | + |
| 16 | +/// <summary> |
| 17 | +/// Defines extensions for <see cref="HttpClient"/>s |
| 18 | +/// </summary> |
| 19 | +public static class HttpClientExtensions |
| 20 | +{ |
| 21 | + |
| 22 | + /// <summary> |
| 23 | + /// Retrieves the A2A discovery document from a remote agent |
| 24 | + /// </summary> |
| 25 | + /// <param name="httpClient">The <see cref="HttpClient"/> to use to perform the request</param> |
| 26 | + /// <param name="request">The discovery request containing the base URI and optional configuration</param> |
| 27 | + /// <param name="cancellationToken">A <see cref="CancellationToken"/></param> |
| 28 | + /// <returns>The retrieved <see cref="A2ADiscoveryDocument"/></returns> |
| 29 | + public static async Task<A2ADiscoveryDocument> GetA2ADiscoveryDocumentAsync(this HttpClient httpClient, A2ADiscoveryDocumentRequest request, CancellationToken cancellationToken = default) |
| 30 | + { |
| 31 | + ArgumentNullException.ThrowIfNull(httpClient); |
| 32 | + ArgumentNullException.ThrowIfNull(request); |
| 33 | + try |
| 34 | + { |
| 35 | + var path = "/.well-known/agent.json"; |
| 36 | + var endpoint = request.Address == null ? new Uri(path, UriKind.Relative) : new Uri(request.Address, path); |
| 37 | + var agentCard = await httpClient.GetFromJsonAsync<AgentCard>(endpoint, cancellationToken).ConfigureAwait(false); |
| 38 | + return new() |
| 39 | + { |
| 40 | + Endpoint = endpoint.IsAbsoluteUri ? endpoint : new(httpClient.BaseAddress!, path), |
| 41 | + Agents = agentCard == null ? [] : [agentCard] |
| 42 | + }; |
| 43 | + } |
| 44 | + catch (HttpRequestException ex) when(ex.StatusCode == HttpStatusCode.NotFound) |
| 45 | + { |
| 46 | + var path = "/.well-known/agents.json"; |
| 47 | + var endpoint = request.Address == null ? new Uri(path, UriKind.Relative) : new Uri(request.Address, path); |
| 48 | + var agentCards = await httpClient.GetFromJsonAsync<List<AgentCard>>(endpoint, cancellationToken).ConfigureAwait(false); |
| 49 | + return new() |
| 50 | + { |
| 51 | + Endpoint = endpoint.IsAbsoluteUri ? endpoint : new(httpClient.BaseAddress!, path), |
| 52 | + Agents = agentCards ?? [] |
| 53 | + }; |
| 54 | + } |
| 55 | + } |
| 56 | + |
| 57 | + /// <summary> |
| 58 | + /// Retrieves the A2A discovery document from a remote agent |
| 59 | + /// </summary> |
| 60 | + /// <param name="httpClient">The <see cref="HttpClient"/> to use to perform the request</param> |
| 61 | + /// <param name="address">The base URI of the remote server to query for discovery metadata</param> |
| 62 | + /// <param name="cancellationToken">A <see cref="CancellationToken"/></param> |
| 63 | + /// <returns>The retrieved <see cref="A2ADiscoveryDocument"/></returns> |
| 64 | + public static Task<A2ADiscoveryDocument> GetA2ADiscoveryDocumentAsync(this HttpClient httpClient, Uri address, CancellationToken cancellationToken = default) |
| 65 | + { |
| 66 | + ArgumentNullException.ThrowIfNull(httpClient); |
| 67 | + ArgumentNullException.ThrowIfNull(address); |
| 68 | + var request = new A2ADiscoveryDocumentRequest() |
| 69 | + { |
| 70 | + Address = address |
| 71 | + }; |
| 72 | + return httpClient.GetA2ADiscoveryDocumentAsync(request, cancellationToken); |
| 73 | + } |
| 74 | + |
| 75 | + /// <summary> |
| 76 | + /// Retrieves the A2A discovery document from a remote agent |
| 77 | + /// </summary> |
| 78 | + /// <param name="httpClient">The <see cref="HttpClient"/> to use to perform the request</param> |
| 79 | + /// <param name="cancellationToken">A <see cref="CancellationToken"/></param> |
| 80 | + /// <returns>The retrieved <see cref="A2ADiscoveryDocument"/></returns> |
| 81 | + public static Task<A2ADiscoveryDocument> GetA2ADiscoveryDocumentAsync(this HttpClient httpClient, CancellationToken cancellationToken = default) |
| 82 | + { |
| 83 | + ArgumentNullException.ThrowIfNull(httpClient); |
| 84 | + var request = new A2ADiscoveryDocumentRequest(); ; |
| 85 | + return httpClient.GetA2ADiscoveryDocumentAsync(request, cancellationToken); |
| 86 | + } |
| 87 | + |
| 88 | +} |
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