From c987364ce795c7f4fe837ad8c2a685558c25b0b5 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 4 Feb 2021 22:03:08 +0800
Subject: ...

---
 BackEnd/Timeline/Services/TimelinePostService.cs | 30 ++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

(limited to 'BackEnd/Timeline/Services/TimelinePostService.cs')

diff --git a/BackEnd/Timeline/Services/TimelinePostService.cs b/BackEnd/Timeline/Services/TimelinePostService.cs
index c2b773ff..cf5f4e55 100644
--- a/BackEnd/Timeline/Services/TimelinePostService.cs
+++ b/BackEnd/Timeline/Services/TimelinePostService.cs
@@ -44,6 +44,17 @@ namespace Timeline.Services
         /// <exception cref="TimelineNotExistException">Thrown when timeline does not exist.</exception>
         Task<List<TimelinePostEntity>> GetPosts(long timelineId, DateTime? modifiedSince = null, bool includeDeleted = false);
 
+        /// <summary>
+        /// Get a post of a timeline.
+        /// </summary>
+        /// <param name="timelineId">The id of the timeline of the post.</param>
+        /// <param name="postId">The id of the post.</param>
+        /// <param name="includeDelete">If true, return the entity even if it is deleted.</param>
+        /// <returns>The post.</returns>
+        /// <exception cref="TimelineNotExistException">Thrown when timeline does not exist.</exception>
+        /// <exception cref="TimelinePostNotExistException">Thrown when post of <paramref name="postId"/> does not exist or has been deleted.</exception>
+        Task<TimelinePostEntity> GetPost(long timelineId, long postId, bool includeDelete = false);
+
         /// <summary>
         /// Get the etag of data of a post.
         /// </summary>
@@ -189,6 +200,25 @@ namespace Timeline.Services
             return await query.ToListAsync();
         }
 
+        public async Task<TimelinePostEntity> GetPost(long timelineId, long postId, bool includeDelete = false)
+        {
+            await CheckTimelineExistence(timelineId);
+
+            var post = await _database.TimelinePosts.Where(p => p.TimelineId == timelineId && p.LocalId == postId).SingleOrDefaultAsync();
+
+            if (post is null)
+            {
+                throw new TimelinePostNotExistException(timelineId, postId, false);
+            }
+
+            if (!includeDelete && post.Content is null)
+            {
+                throw new TimelinePostNotExistException(timelineId, postId, true);
+            }
+
+            return post;
+        }
+
         public async Task<string> GetPostDataETag(long timelineId, long postId)
         {
             await CheckTimelineExistence(timelineId);
-- 
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