Revert "Revert "[mastodon-client] send actual default post privacy instead of fallback value""

This reverts commit a441cc6067.

packages/backend/src/server/api/endpoints/i/registry/get-unsecure.ts

@@ -33,7 +33,7 @@ export const paramDef = {
 } as const;
 
 export default define(meta, paramDef, async (ps, user) => {
-	if (ps.key !== "reactions") return;
+	if (ps.key !== "reactions" && ps.key !== "defaultNoteVisibility") return;
 	const query = RegistryItems.createQueryBuilder("item")
 		.where("item.domain IS NULL")
 		.andWhere("item.userId = :userId", { userId: user.id })

packages/backend/src/server/api/mastodon/endpoints/account.ts

@@ -48,7 +48,7 @@ export function apiAccountMastodon(router: Router): void {
 			acct.source = {
 				note: acct.note,
 				fields: acct.fields,
-				privacy: "public",
+				privacy: await client.getDefaultPostPrivacy(),
 				sensitive: false,
 				language: "",
 			};

packages/megalodon/src/misskey.ts

@@ -1539,6 +1539,23 @@ export default class Misskey implements MegalodonInterface {
         .then(res => res.data[0] ?? '⭐');
   }
 
+	private async getDefaultPostPrivacy(): Promise<string> {
+		// NOTE: get-unsecure is calckey's extension.
+		//       Misskey doesn't have this endpoint and regular `/i/registry/get` won't work
+		//       unless you have a 'nativeToken', which is reserved for the frontend webapp.
+
+		return this.client
+			.post<string>('/api/i/registry/get-unsecure', {
+				key: 'defaultNoteVisibility',
+				scope: ['client', 'base'],
+			})
+			.then(res => {
+				if (!res.data || (res.data != 'public' && res.data != 'home' && res.data != 'followers' && res.data != 'specified'))
+					return 'public';
+				return this.converter.visibility(res.data);
+			});
+	}
+
   public async unfavouriteStatus(id: string): Promise<Response<Entity.Status>> {
     // NOTE: Misskey allows only one reaction per status, so we don't need to care what that emoji was.
     return this.deleteEmojiReaction(id, '');