add new role conditions for local/remote followers/followees

packages/backend/src/core/CacheService.ts

@@ -15,6 +15,13 @@ import { bindThis } from '@/decorators.js';
 import type { GlobalEvents } from '@/core/GlobalEventService.js';
 import type { OnApplicationShutdown } from '@nestjs/common';
 
+export interface FollowStats {
+	localFollowing: number;
+	localFollowers: number;
+	remoteFollowing: number;
+	remoteFollowers: number;
+}
+
 @Injectable()
 export class CacheService implements OnApplicationShutdown {
 	public userByIdCache: MemoryKVCache<MiUser>;
@@ -27,6 +34,7 @@ export class CacheService implements OnApplicationShutdown {
 	public userBlockedCache: RedisKVCache<Set<string>>; // NOTE: 「被」Blockキャッシュ
 	public renoteMutingsCache: RedisKVCache<Set<string>>;
 	public userFollowingsCache: RedisKVCache<Record<string, Pick<MiFollowing, 'withReplies'> | undefined>>;
+	private readonly userFollowStatsCache = new MemoryKVCache<FollowStats>(1000 * 60 * 10); // 10 minutes
 
 	constructor(
 		@Inject(DI.redis)
@@ -167,6 +175,18 @@ export class CacheService implements OnApplicationShutdown {
 					const followee = this.userByIdCache.get(body.followeeId);
 					if (followee) followee.followersCount++;
 					this.userFollowingsCache.delete(body.followerId);
+					this.userFollowStatsCache.delete(body.followerId);
+					this.userFollowStatsCache.delete(body.followeeId);
+					break;
+				}
+				case 'unfollow': {
+					const follower = this.userByIdCache.get(body.followerId);
+					if (follower) follower.followingCount--;
+					const followee = this.userByIdCache.get(body.followeeId);
+					if (followee) followee.followersCount--;
+					this.userFollowingsCache.delete(body.followerId);
+					this.userFollowStatsCache.delete(body.followerId);
+					this.userFollowStatsCache.delete(body.followeeId);
 					break;
 				}
 				default:
@@ -187,6 +207,52 @@ export class CacheService implements OnApplicationShutdown {
 		}) ?? null;
 	}
 
+	@bindThis
+	public async getFollowStats(userId: MiUser['id']): Promise<FollowStats> {
+		return await this.userFollowStatsCache.fetch(userId, async () => {
+			const stats = {
+				localFollowing: 0,
+				localFollowers: 0,
+				remoteFollowing: 0,
+				remoteFollowers: 0,
+			};
+
+			const followings = await this.followingsRepository.findBy([
+				{ followerId: userId },
+				{ followeeId: userId },
+			]);
+
+			for (const following of followings) {
+				if (following.followerId === userId) {
+					// increment following; user is a follower of someone else
+					if (following.followeeHost == null) {
+						stats.localFollowing++;
+					} else {
+						stats.remoteFollowing++;
+					}
+				} else if (following.followeeId === userId) {
+					// increment followers; user is followed by someone else
+					if (following.followerHost == null) {
+						stats.localFollowers++;
+					} else {
+						stats.remoteFollowers++;
+					}
+				} else {
+					// Should never happen
+				}
+			}
+
+			// Infer remote-remote followers heuristically, since we don't track that info directly.
+			const user = await this.findUserById(userId);
+			if (user.host !== null) {
+				stats.remoteFollowing = Math.max(0, user.followingCount - stats.localFollowing);
+				stats.remoteFollowers = Math.max(0, user.followersCount - stats.localFollowers);
+			}
+
+			return stats;
+		});
+	}
+
 	@bindThis
 	public dispose(): void {
 		this.redisForSub.off('message', this.onMessage);

packages/backend/src/core/RoleService.ts

@@ -20,6 +20,7 @@ import type { MiUser } from '@/models/User.js';
 import { DI } from '@/di-symbols.js';
 import { bindThis } from '@/decorators.js';
 import { CacheService } from '@/core/CacheService.js';
+import type { FollowStats } from '@/core/CacheService.js';
 import type { RoleCondFormulaValue } from '@/models/Role.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import type { GlobalEvents } from '@/core/GlobalEventService.js';
@@ -221,20 +222,20 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 	}
 
 	@bindThis
-	private evalCond(user: MiUser, roles: MiRole[], value: RoleCondFormulaValue): boolean {
+	private evalCond(user: MiUser, roles: MiRole[], value: RoleCondFormulaValue, followStats: FollowStats): boolean {
 		try {
 			switch (value.type) {
 				// ～かつ～
 				case 'and': {
-					return value.values.every(v => this.evalCond(user, roles, v));
+					return value.values.every(v => this.evalCond(user, roles, v, followStats));
 				}
 				// ～または～
 				case 'or': {
-					return value.values.some(v => this.evalCond(user, roles, v));
+					return value.values.some(v => this.evalCond(user, roles, v, followStats));
 				}
 				// ～ではない
 				case 'not': {
-					return !this.evalCond(user, roles, value.value);
+					return !this.evalCond(user, roles, value.value, followStats);
 				}
 				// マニュアルロールがアサインされている
 				case 'roleAssignedTo': {
@@ -305,6 +306,30 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 				case 'followingMoreThanOrEq': {
 					return user.followingCount >= value.value;
 				}
+				case 'localFollowersLessThanOrEq': {
+					return followStats.localFollowers <= value.value;
+				}
+				case 'localFollowersMoreThanOrEq': {
+					return followStats.localFollowers >= value.value;
+				}
+				case 'localFollowingLessThanOrEq': {
+					return followStats.localFollowing <= value.value;
+				}
+				case 'localFollowingMoreThanOrEq': {
+					return followStats.localFollowing >= value.value;
+				}
+				case 'remoteFollowersLessThanOrEq': {
+					return followStats.remoteFollowers <= value.value;
+				}
+				case 'remoteFollowersMoreThanOrEq': {
+					return followStats.remoteFollowers >= value.value;
+				}
+				case 'remoteFollowingLessThanOrEq': {
+					return followStats.remoteFollowing <= value.value;
+				}
+				case 'remoteFollowingMoreThanOrEq': {
+					return followStats.remoteFollowing >= value.value;
+				}
 				// ノート数が指定値以下
 				case 'notesLessThanOrEq': {
 					return user.notesCount <= value.value;
@@ -340,10 +365,11 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 	@bindThis
 	public async getUserRoles(userId: MiUser['id']) {
 		const roles = await this.rolesCache.fetch(() => this.rolesRepository.findBy({}));
+		const followStats = await this.cacheService.getFollowStats(userId);
 		const assigns = await this.getUserAssigns(userId);
 		const assignedRoles = roles.filter(r => assigns.map(x => x.roleId).includes(r.id));
 		const user = roles.some(r => r.target === 'conditional') ? await this.cacheService.findUserById(userId) : null;
-		const matchedCondRoles = roles.filter(r => r.target === 'conditional' && this.evalCond(user!, assignedRoles, r.condFormula));
+		const matchedCondRoles = roles.filter(r => r.target === 'conditional' && this.evalCond(user!, assignedRoles, r.condFormula, followStats));
 		return [...assignedRoles, ...matchedCondRoles];
 	}
 
@@ -357,12 +383,13 @@ export class RoleService implements OnApplicationShutdown, OnModuleInit {
 		// 期限切れのロールを除外
 		assigns = assigns.filter(a => a.expiresAt == null || (a.expiresAt.getTime() > now));
 		const roles = await this.rolesCache.fetch(() => this.rolesRepository.findBy({}));
+		const followStats = await this.cacheService.getFollowStats(userId);
 		const assignedRoles = roles.filter(r => assigns.map(x => x.roleId).includes(r.id));
 		const assignedBadgeRoles = assignedRoles.filter(r => r.asBadge);
 		const badgeCondRoles = roles.filter(r => r.asBadge && (r.target === 'conditional'));
 		if (badgeCondRoles.length > 0) {
 			const user = roles.some(r => r.target === 'conditional') ? await this.cacheService.findUserById(userId) : null;
-			const matchedBadgeCondRoles = badgeCondRoles.filter(r => this.evalCond(user!, assignedRoles, r.condFormula));
+			const matchedBadgeCondRoles = badgeCondRoles.filter(r => this.evalCond(user!, assignedRoles, r.condFormula, followStats));
 			return [...assignedBadgeRoles, ...matchedBadgeCondRoles];
 		} else {
 			return assignedBadgeRoles;

packages/backend/src/models/Role.ts

@@ -147,6 +147,70 @@ type CondFormulaValueFollowingMoreThanOrEq = {
 	value: number;
 };
 
+/**
+ * Is followed by at most N local users
+ */
+type CondFormulaValueLocalFollowersLessThanOrEq = {
+	type: 'localFollowersLessThanOrEq';
+	value: number;
+};
+
+/**
+ * Is followed by at least N local users
+ */
+type CondFormulaValueLocalFollowersMoreThanOrEq = {
+	type: 'localFollowersMoreThanOrEq';
+	value: number;
+};
+
+/**
+ * Is following at most N local users
+ */
+type CondFormulaValueLocalFollowingLessThanOrEq = {
+	type: 'localFollowingLessThanOrEq';
+	value: number;
+};
+
+/**
+ * Is following at least N local users
+ */
+type CondFormulaValueLocalFollowingMoreThanOrEq = {
+	type: 'localFollowingMoreThanOrEq';
+	value: number;
+};
+
+/**
+ * Is followed by at most N remote users
+ */
+type CondFormulaValueRemoteFollowersLessThanOrEq = {
+	type: 'remoteFollowersLessThanOrEq';
+	value: number;
+};
+
+/**
+ * Is followed by at least N remote users
+ */
+type CondFormulaValueRemoteFollowersMoreThanOrEq = {
+	type: 'remoteFollowersMoreThanOrEq';
+	value: number;
+};
+
+/**
+ * Is following at most N remote users
+ */
+type CondFormulaValueRemoteFollowingLessThanOrEq = {
+	type: 'remoteFollowingLessThanOrEq';
+	value: number;
+};
+
+/**
+ * Is following at least N remote users
+ */
+type CondFormulaValueRemoteFollowingMoreThanOrEq = {
+	type: 'remoteFollowingMoreThanOrEq';
+	value: number;
+};
+
 /**
  * 投稿数が指定値以下の場合のみ成立とする
  */
@@ -182,6 +246,14 @@ export type RoleCondFormulaValue = { id: string } & (
 	CondFormulaValueFollowersMoreThanOrEq |
 	CondFormulaValueFollowingLessThanOrEq |
 	CondFormulaValueFollowingMoreThanOrEq |
+	CondFormulaValueLocalFollowersLessThanOrEq |
+	CondFormulaValueLocalFollowersMoreThanOrEq |
+	CondFormulaValueLocalFollowingLessThanOrEq |
+	CondFormulaValueLocalFollowingMoreThanOrEq |
+	CondFormulaValueRemoteFollowersLessThanOrEq |
+	CondFormulaValueRemoteFollowersMoreThanOrEq |
+	CondFormulaValueRemoteFollowingLessThanOrEq |
+	CondFormulaValueRemoteFollowingMoreThanOrEq |
 	CondFormulaValueNotesLessThanOrEq |
 	CondFormulaValueNotesMoreThanOrEq
 );