actor ap retrieval functionnal

src/BirdsiteLive.Domain/UserService.cs

@@ -0,0 +1,57 @@
+using System;
+using BirdsiteLive.ActivityPub;
+using BirdsiteLive.Common.Settings;
+using BirdsiteLive.Twitter.Models;
+
+namespace BirdsiteLive.Domain
+{
+    public interface IUserService
+    {
+        Actor GetUser(TwitterUser twitterUser);
+    }
+
+    public class UserService : IUserService
+    {
+        private readonly ICryptoService _cryptoService;
+        private readonly string _host;
+
+        #region Ctor
+        public UserService(InstanceSettings instanceSettings, ICryptoService cryptoService)
+        {
+            _cryptoService = cryptoService;
+            _host = $"https://{instanceSettings.Domain.Replace("https://",string.Empty).Replace("http://", string.Empty).TrimEnd('/')}";
+        }
+        #endregion
+
+        public Actor GetUser(TwitterUser twitterUser)
+        {
+            var user = new Actor
+            {
+                id = $"{_host}/users/{twitterUser.Acct}",
+                type = "Person",
+                preferredUsername = twitterUser.Acct,
+                name = twitterUser.Name,
+                inbox = $"{_host}/users/{twitterUser.Acct}/inbox",
+                summary = twitterUser.Description,
+                url = $"{_host}/@{twitterUser.Acct}",
+                publicKey = new PublicKey()
+                {
+                    id = $"{_host}/users/{twitterUser.Acct}#main-key",
+                    owner = $"{_host}/users/{twitterUser.Acct}",
+                    publicKeyPem = _cryptoService.GetUserPem(twitterUser.Acct)
+                },
+                icon = new Image
+                {
+                    mediaType = "image/jpeg",
+                    url = twitterUser.ProfileImageUrl
+                },
+                image = new Image
+                {
+                    mediaType = "image/jpeg",
+                    url = twitterUser.ProfileBannerURL
+                }
+            };
+            return user;
+        }
+    }
+}