fix: ActivityPubのidが重複した際の処理を修正

src/main/kotlin/dev/usbharu/hideout/repository/IPostRepository.kt

@@ -20,4 +20,5 @@ interface IPostRepository {
                                         userId: Long?): List<Post>
 
     suspend fun findByUserId(idOrNull: Long, since: Instant?, until: Instant?, minId: Long?, maxId: Long?, limit: Int?, userId: Long?): List<Post>
+    suspend fun findByApId(id: String): Post?
 }

src/main/kotlin/dev/usbharu/hideout/repository/PostRepositoryImpl.kt

@@ -89,6 +89,12 @@ class PostRepositoryImpl(database: Database, private val idGenerateService: IdGe
     override suspend fun findByUserId(idOrNull: Long, since: Instant?, until: Instant?, minId: Long?, maxId: Long?, limit: Int?, userId: Long?): List<Post> {
         TODO("Not yet implemented")
     }
+
+    override suspend fun findByApId(id: String): Post? {
+        return query {
+            Posts.select { Posts.apId eq id }.singleOrNull()?.toPost()
+        }
+    }
 }
 
 object Posts : Table() {

src/main/kotlin/dev/usbharu/hideout/service/activitypub/ActivityPubNoteServiceImpl.kt

@@ -72,6 +72,17 @@ class ActivityPubNoteServiceImpl(
     override suspend fun fetchNote(url: String, targetActor: String?): Note {
         val post = postRepository.findByUrl(url)
         if (post != null) {
+            return postToNote(post)
+        }
+        val response = httpClient.getAp(
+                url,
+                "$targetActor#pubkey"
+        )
+        val note = response.body<Note>()
+        return note(note, targetActor, url)
+    }
+
+    private suspend fun postToNote(post: Post): Note {
         val user = userService.findById(post.userId)
         val reply = post.replyId?.let { postRepository.findOneById(it) }
         return Note(
@@ -86,19 +97,16 @@ class ActivityPubNoteServiceImpl(
                 inReplyTo = reply?.url
         )
     }
-        val response = httpClient.getAp(
-            url,
-            "$targetActor#pubkey"
-        )
-        val note = response.body<Note>()
-        return note(note, targetActor, url)
-    }
 
     private suspend fun ActivityPubNoteServiceImpl.note(
             note: Note,
             targetActor: String?,
             url: String
     ): Note {
+        val findByApId = postRepository.findByApId(url)
+        if (findByApId != null) {
+            return postToNote(findByApId)
+        }
         val person = activityPubUserService.fetchPerson(
                 note.attributedTo ?: throw IllegalActivityPubObjectException("note.attributedTo is null"),
                 targetActor