無駄なAP deliverをしないように (#5589)

* DeliverManager, note/create

* recipe

* followers delivers

* comment

* rename

* fix

* cleanup

src/remote/activitypub/deliver-manager.ts

@@ -0,0 +1,131 @@
+import { Users, Followings } from '../../models';
+import { ILocalUser, IRemoteUser } from '../../models/entities/user';
+import { deliver } from '../../queue';
+
+//#region types
+interface IRecipe {
+	type: string;
+}
+
+interface IFollowersRecipe extends IRecipe {
+	type: 'Followers';
+}
+
+interface IDirectRecipe extends IRecipe {
+	type: 'Direct';
+	to: IRemoteUser;
+}
+
+const isFollowers = (recipe: any): recipe is IFollowersRecipe =>
+	recipe.type === 'Followers';
+
+const isDirect = (recipe: any): recipe is IDirectRecipe =>
+	recipe.type === 'Direct';
+//#endregion
+
+export default class DeliverManager {
+	private actor: ILocalUser;
+	private activity: any;
+	private recipes: IRecipe[] = [];
+
+	/**
+	 * Constructor
+	 * @param actor Actor
+	 * @param activity Activity to deliver
+	 */
+	constructor(actor: ILocalUser, activity: any) {
+		this.actor = actor;
+		this.activity = activity;
+	}
+
+	/**
+	 * Add recipe for followers deliver
+	 */
+	public addFollowersRecipe() {
+		const deliver = {
+			type: 'Followers'
+		} as IFollowersRecipe;
+
+		this.addRecipe(deliver);
+	}
+
+	/**
+	 * Add recipe for direct deliver
+	 * @param to To
+	 */
+	public addDirectRecipe(to: IRemoteUser) {
+		const recipe = {
+			type: 'Direct',
+			to
+		} as IDirectRecipe;
+
+		this.addRecipe(recipe);
+	}
+
+	/**
+	 * Add recipe
+	 * @param recipe Recipe
+	 */
+	public addRecipe(recipe: IRecipe) {
+		this.recipes.push(recipe);
+	}
+
+	/**
+	 * Execute delivers
+	 */
+	public async execute() {
+		if (!Users.isLocalUser(this.actor)) return;
+
+		const inboxes: string[] = [];
+
+		// build inbox list
+		for (const recipe of this.recipes) {
+			if (isFollowers(recipe)) {
+				// followers deliver
+				const followers = await Followings.find({
+					followeeId: this.actor.id
+				});
+
+				for (const following of followers) {
+					if (Followings.isRemoteFollower(following)) {
+						const inbox = following.followerSharedInbox || following.followerInbox;
+						if (!inboxes.includes(inbox)) inboxes.push(inbox);
+					}
+				}
+			} else if (isDirect(recipe)) {
+				// direct deliver
+				const inbox = recipe.to.inbox;
+				if (inbox && !inboxes.includes(inbox)) inboxes.push(inbox);
+			}
+		}
+
+		// deliver
+		for (const inbox of inboxes) {
+			deliver(this.actor, this.activity, inbox);
+		}
+	}
+}
+
+//#region Utilities
+/**
+ * Deliver activity to followers
+ * @param activity Activity
+ * @param from Followee
+ */
+export async function deliverToFollowers(actor: ILocalUser, activity: any) {
+	const manager = new DeliverManager(actor, activity);
+	manager.addFollowersRecipe();
+	await manager.execute();
+}
+
+/**
+ * Deliver activity to user
+ * @param activity Activity
+ * @param to Target user
+ */
+export async function deliverToUser(actor: ILocalUser, activity: any, to: IRemoteUser) {
+	const manager = new DeliverManager(actor, activity);
+	manager.addDirectRecipe(to);
+	await manager.execute();
+}
+//#endregion