1 files changed, 28 insertions, 8 deletions

diff --git a/packages/backend/src/core/NoteCreateService.ts b/packages/backend/src/core/NoteCreateService.ts
index 631d7074bd..41efa76f3f 100644
--- a/packages/backend/src/core/NoteCreateService.ts
+++ b/packages/backend/src/core/NoteCreateService.ts
@@ -282,7 +282,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 			data.visibility = 'home';
 		}
 
-		if (data.renote) {
+		if (this.isRenote(data)) {
 			switch (data.renote.visibility) {
 				case 'public':
 					// public noteは無条件にrenote可能
@@ -309,7 +309,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 
 		// Check blocking
-		if (data.renote && !this.isQuote(data)) {
+		if (this.isRenote(data) && !this.isQuote(data)) {
 			if (data.renote.userHost === null) {
 				if (data.renote.userId !== user.id) {
 					const blocked = await this.userBlockingService.checkBlocked(data.renote.userId, user.id);
@@ -495,7 +495,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 		}
 
 		// Check blocking
-		if (data.renote && !this.isQuote(data)) {
+		if (this.isRenote(data) && !this.isQuote(data)) {
 			if (data.renote.userHost === null) {
 				if (data.renote.userId !== user.id) {
 					const blocked = await this.userBlockingService.checkBlocked(data.renote.userId, user.id);
@@ -627,6 +627,14 @@ export class NoteCreateService implements OnApplicationShutdown {
 			userHost: user.host,
 		});
 
+		// should really not happen, but better safe than sorry
+		if (data.reply?.id === insert.id) {
+			throw new Error("A note can't reply to itself");
+		}
+		if (data.renote?.id === insert.id) {
+			throw new Error("A note can't renote itself");
+		}
+
 		if (data.uri != null) insert.uri = data.uri;
 		if (data.url != null) insert.url = data.url;
 
@@ -662,6 +670,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 						noteVisibility: insert.visibility,
 						userId: user.id,
 						userHost: user.host,
+						channelId: insert.channelId,
 					});
 
 					await transactionalEntityManager.insert(MiPoll, poll);
@@ -855,7 +864,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 			}
 
 			// If it is renote
-			if (data.renote) {
+			if (this.isRenote(data)) {
 				const type = this.isQuote(data) ? 'quote' : 'renote';
 
 				// Notify
@@ -1055,9 +1064,20 @@ export class NoteCreateService implements OnApplicationShutdown {
 	}
 
 	@bindThis
-	private isQuote(note: Option): note is Option & { renote: MiNote } {
-		// sync with misc/is-quote.ts
-		return !!note.renote && (!!note.text || !!note.cw || (!!note.files && !!note.files.length) || !!note.poll);
+	private isRenote(note: Option): note is Option & { renote: MiNote } {
+		return note.renote != null;
+	}
+
+	@bindThis
+	private isQuote(note: Option & { renote: MiNote }): note is Option & { renote: MiNote } & (
+		{ text: string } | { cw: string } | { reply: MiNote } | { poll: IPoll } | { files: MiDriveFile[] }
+	) {
+		// NOTE: SYNC WITH misc/is-quote.ts
+		return note.text != null ||
+			note.reply != null ||
+			note.cw != null ||
+			note.poll != null ||
+			(note.files != null && note.files.length > 0);
 	}
 
 	@bindThis
@@ -1133,7 +1153,7 @@ export class NoteCreateService implements OnApplicationShutdown {
 	private async renderNoteOrRenoteActivity(data: Option, note: MiNote) {
 		if (data.localOnly) return null;
 
-		const content = data.renote && !this.isQuote(data)
+		const content = this.isRenote(data) && !this.isQuote(data)
 			? this.apRendererService.renderAnnounce(data.renote.uri ? data.renote.uri : `${this.config.url}/notes/${data.renote.id}`, note)
 			: this.apRendererService.renderCreate(await this.apRendererService.renderNote(note, false), note);