support attachments

src/BirdsiteLive.Domain/StatusService.cs

@@ -0,0 +1,119 @@
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using BirdsiteLive.ActivityPub;
+using BirdsiteLive.Common.Settings;
+using Tweetinvi.Models;
+using Tweetinvi.Models.Entities;
+
+namespace BirdsiteLive.Domain
+{
+    public interface IStatusService
+    {
+        Note GetStatus(string username, ITweet tweet);
+    }
+
+    public class StatusService : IStatusService
+    {
+        private readonly InstanceSettings _instanceSettings;
+
+        #region Ctor
+        public StatusService(InstanceSettings instanceSettings)
+        {
+            _instanceSettings = instanceSettings;
+        }
+        #endregion
+
+        public Note GetStatus(string username, ITweet tweet)
+        {
+            var actorUrl = $"https://{_instanceSettings.Domain}/users/{username}";
+            var noteId = $"https://{_instanceSettings.Domain}/users/{username}/statuses/{tweet.Id}";
+            var noteUrl = $"https://{_instanceSettings.Domain}/@{username}/{tweet.Id}";
+
+            var to = $"{actorUrl}/followers";
+            var apPublic = "https://www.w3.org/ns/activitystreams#Public";
+
+            var note = new Note
+            {
+                id = $"{noteId}/activity",
+
+                published = tweet.CreatedAt.ToString("s") + "Z",
+                url = noteUrl,
+                attributedTo = actorUrl,
+
+                //to = new [] {to},
+                //cc = new [] { apPublic },
+
+                to = new[] { to },
+                cc = new[] { apPublic },
+                //cc = new string[0],
+
+                sensitive = false,
+                content = $"<p>{tweet.Text}</p>",
+                attachment = GetAttachments(tweet.Media),
+                tag = new string[0]
+            };
+          
+
+            return note;
+        }
+
+        private Attachment[] GetAttachments(List<IMediaEntity> media)
+        {
+            var result = new List<Attachment>();
+
+            foreach (var m in media)
+            {
+                var mediaUrl = GetMediaUrl(m);
+                var mediaType = GetMediaType(m.MediaType, mediaUrl);
+                if (mediaType == null) continue;
+
+                var att = new Attachment
+                {
+                    type = "Document",
+                    mediaType = mediaType,
+                    url = mediaUrl
+                };
+                result.Add(att);
+            }
+
+            return result.ToArray();
+        }
+
+        private string GetMediaUrl(IMediaEntity media)
+        {
+            switch (media.MediaType)
+            {
+                case "photo": return media.MediaURLHttps;
+                case "animated_gif": return media.VideoDetails.Variants[0].URL;
+                case "video": return media.VideoDetails.Variants.OrderByDescending(x => x.Bitrate).First().URL;
+                default: return null;
+            }
+        }
+
+        private string GetMediaType(string mediaType, string mediaUrl)
+        {
+            switch (mediaType)
+            {
+                case "photo":
+                    var ext = Path.GetExtension(mediaUrl);
+                    switch (ext)
+                    {
+                        case ".jpg":
+                        case ".jpeg":
+                            return "image/jpeg";
+                        case ".png":
+                            return "image/png";
+                    }
+                    return null;
+
+                case "animated_gif":
+                    return "image/gif";
+
+                case "video":
+                    return "video/mp4";
+            }
+            return null;
+        }
+    }
+}