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fluxer_api/src/user/services/CustomStatusValidator.ts

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {createEmojiID, type EmojiID, type UserID} from '~/BrandedTypes';
+import {InputValidationError} from '~/errors/InputValidationError';
+import type {IGuildRepository} from '~/guild/IGuildRepository';
+import type {PackService} from '~/pack/PackService';
+import type {z} from '~/Schema';
+import type {IUserAccountRepository} from '~/user/repositories/IUserAccountRepository';
+import type {CustomStatusPayload} from '~/user/UserTypes';
+
+export interface ValidatedCustomStatus {
+	text: string | null;
+	expiresAt: Date | null;
+	emojiId: EmojiID | null;
+	emojiName: string | null;
+	emojiAnimated: boolean;
+}
+
+export class CustomStatusValidator {
+	constructor(
+		private readonly userAccountRepository: IUserAccountRepository,
+		private readonly guildRepository: IGuildRepository,
+		private readonly packService: PackService,
+	) {}
+
+	async validate(userId: UserID, payload: z.infer<typeof CustomStatusPayload>): Promise<ValidatedCustomStatus> {
+		const text = payload.text ?? null;
+		const expiresAt = payload.expires_at ?? null;
+		let emojiId: EmojiID | null = null;
+		let emojiName: string | null = null;
+		let emojiAnimated = false;
+
+		if (payload.emoji_id != null) {
+			emojiId = createEmojiID(payload.emoji_id);
+
+			const emoji = await this.guildRepository.getEmojiById(emojiId);
+			if (!emoji) {
+				throw InputValidationError.create('custom_status.emoji_id', 'Custom emoji not found');
+			}
+
+			const user = await this.userAccountRepository.findUnique(userId);
+			if (!user?.canUseGlobalExpressions()) {
+				throw InputValidationError.create('custom_status.emoji_id', 'Premium required to use custom emoji');
+			}
+
+			const guildMember = await this.guildRepository.getMember(emoji.guildId, userId);
+
+			let hasAccess = guildMember !== null;
+			if (!hasAccess) {
+				const resolver = await this.packService.createPackExpressionAccessResolver({
+					userId,
+					type: 'emoji',
+				});
+				const resolution = await resolver.resolve(emoji.guildId);
+				hasAccess = resolution === 'accessible';
+			}
+
+			if (!hasAccess) {
+				throw InputValidationError.create(
+					'custom_status.emoji_id',
+					'Cannot use this emoji without access to its guild or installed pack',
+				);
+			}
+
+			emojiName = emoji.name;
+			emojiAnimated = emoji.isAnimated;
+		} else if (payload.emoji_name != null) {
+			emojiName = payload.emoji_name;
+		}
+
+		return {
+			text,
+			expiresAt,
+			emojiId,
+			emojiName,
+			emojiAnimated,
+		};
+	}
+}