BirdsiteLive/src/BirdsiteLive.Domain/ActivityPubService.cs

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using System;
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using System.Linq;
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using System.Net;
using System.Net.Http;
using System.Text;
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using System.Threading.Tasks;
using BirdsiteLive.ActivityPub;
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using BirdsiteLive.ActivityPub.Models;
using BirdsiteLive.Common.Settings;
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using Newtonsoft.Json;
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using Org.BouncyCastle.Bcpg;
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namespace BirdsiteLive.Domain
{
public interface IActivityPubService
{
Task<Actor> GetUser(string objectId);
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Task<HttpStatusCode> PostDataAsync<T>(T data, string targetHost, string actorUrl, string inbox = null);
Task<HttpStatusCode> PostNewNoteActivity(Note note, string username, string noteId, string targetHost,
string targetInbox);
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}
public class ActivityPubService : IActivityPubService
{
private readonly InstanceSettings _instanceSettings;
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private readonly ICryptoService _cryptoService;
#region Ctor
public ActivityPubService(ICryptoService cryptoService, InstanceSettings instanceSettings)
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{
_cryptoService = cryptoService;
_instanceSettings = instanceSettings;
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}
#endregion
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public async Task<Actor> GetUser(string objectId)
{
using (var httpClient = new HttpClient())
{
httpClient.DefaultRequestHeaders.Add("Accept", "application/json");
var result = await httpClient.GetAsync(objectId);
var content = await result.Content.ReadAsStringAsync();
return JsonConvert.DeserializeObject<Actor>(content);
}
}
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public async Task<HttpStatusCode> PostNewNoteActivity(Note note, string username, string noteId, string targetHost, string targetInbox)
{
//var username = "gra";
var actor = $"https://{_instanceSettings.Domain}/users/{username}";
//var targetHost = "mastodon.technology";
//var target = $"{targetHost}/users/testtest";
//var inbox = $"/users/testtest/inbox";
//var noteGuid = Guid.NewGuid();
var noteUri = $"https://{_instanceSettings.Domain}/users/{username}/statuses/{noteId}";
//var noteUrl = $"https://{_instanceSettings.Domain}/@{username}/{noteId}";
//var to = $"{actor}/followers";
//var apPublic = "https://www.w3.org/ns/activitystreams#Public";
var now = DateTime.UtcNow;
var nowString = now.ToString("s") + "Z";
var noteActivity = new ActivityCreateNote()
{
context = "https://www.w3.org/ns/activitystreams",
id = $"{noteUri}/activity",
type = "Create",
actor = actor,
published = nowString,
to = note.to,
cc = note.cc,
apObject = note
};
return await PostDataAsync(noteActivity, targetHost, actor, targetInbox);
}
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public async Task<HttpStatusCode> PostDataAsync<T>(T data, string targetHost, string actorUrl, string inbox = null)
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{
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var usedInbox = $"/inbox";
if (!string.IsNullOrWhiteSpace(inbox))
usedInbox = inbox;
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var json = JsonConvert.SerializeObject(data);
var date = DateTime.UtcNow.ToUniversalTime();
var httpDate = date.ToString("r");
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var signature = _cryptoService.SignAndGetSignatureHeader(date, actorUrl, targetHost, usedInbox);
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var client = new HttpClient();
var httpRequestMessage = new HttpRequestMessage
{
Method = HttpMethod.Post,
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RequestUri = new Uri($"https://{targetHost}/{usedInbox}"),
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Headers =
{
{"Host", targetHost},
{"Date", httpDate},
{"Signature", signature}
},
Content = new StringContent(json, Encoding.UTF8, "application/ld+json")
};
var response = await client.SendAsync(httpRequestMessage);
return response.StatusCode;
}
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}
}