initial commit

fluxer_app/src/utils/ExpressionPermissionUtils.tsx

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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 type {I18n} from '@lingui/core';
+import {msg} from '@lingui/core/macro';
+import {Permissions} from '~/Constants';
+import type {ChannelRecord} from '~/records/ChannelRecord';
+import type {GuildStickerRecord} from '~/records/GuildStickerRecord';
+import type {Emoji} from '~/stores/EmojiStore';
+import PermissionStore from '~/stores/PermissionStore';
+import UserStore from '~/stores/UserStore';
+
+export interface AvailabilityCheck {
+	canUse: boolean;
+	isLockedByPremium: boolean;
+	isLockedByPermission: boolean;
+	lockReason?: string;
+}
+
+export function checkEmojiAvailability(i18n: I18n, emoji: Emoji, channel: ChannelRecord | null): AvailabilityCheck {
+	if (!emoji.guildId) {
+		return {
+			canUse: true,
+			isLockedByPremium: false,
+			isLockedByPermission: false,
+		};
+	}
+
+	const currentUser = UserStore.getCurrentUser();
+	const hasPremium = currentUser?.isPremium() ?? false;
+
+	if (!channel?.guildId) {
+		if (!hasPremium) {
+			return {
+				canUse: false,
+				isLockedByPremium: true,
+				isLockedByPermission: false,
+				lockReason: i18n._(msg`Unlock custom emojis in DMs with Plutonium`),
+			};
+		}
+		return {
+			canUse: true,
+			isLockedByPremium: false,
+			isLockedByPermission: false,
+		};
+	}
+
+	const isExternalEmoji = emoji.guildId !== channel.guildId;
+
+	if (!isExternalEmoji) {
+		return {
+			canUse: true,
+			isLockedByPremium: false,
+			isLockedByPermission: false,
+		};
+	}
+
+	const hasPermission = PermissionStore.can(Permissions.USE_EXTERNAL_EMOJIS, {
+		guildId: channel.guildId,
+		channelId: channel.id,
+	});
+
+	if (!hasPermission) {
+		if (!hasPremium) {
+			return {
+				canUse: false,
+				isLockedByPremium: false,
+				isLockedByPermission: true,
+				lockReason: i18n._(msg`You lack permission to use external emojis in this channel`),
+			};
+		}
+		return {
+			canUse: false,
+			isLockedByPremium: false,
+			isLockedByPermission: true,
+			lockReason: i18n._(msg`You lack permission to use external emojis in this channel`),
+		};
+	}
+
+	if (!hasPremium) {
+		return {
+			canUse: false,
+			isLockedByPremium: true,
+			isLockedByPermission: false,
+			lockReason: i18n._(msg`Unlock external custom emojis with Plutonium`),
+		};
+	}
+
+	return {
+		canUse: true,
+		isLockedByPremium: false,
+		isLockedByPermission: false,
+	};
+}
+
+export function checkStickerAvailability(
+	i18n: I18n,
+	sticker: GuildStickerRecord,
+	channel: ChannelRecord | null,
+): AvailabilityCheck {
+	if (!sticker.guildId) {
+		return {
+			canUse: true,
+			isLockedByPremium: false,
+			isLockedByPermission: false,
+		};
+	}
+
+	const currentUser = UserStore.getCurrentUser();
+	const hasPremium = currentUser?.isPremium() ?? false;
+
+	if (!channel?.guildId) {
+		if (!hasPremium) {
+			return {
+				canUse: false,
+				isLockedByPremium: true,
+				isLockedByPermission: false,
+				lockReason: i18n._(msg`Unlock stickers in DMs with Plutonium`),
+			};
+		}
+		return {
+			canUse: true,
+			isLockedByPremium: false,
+			isLockedByPermission: false,
+		};
+	}
+
+	const isExternalSticker = sticker.guildId !== channel.guildId;
+
+	if (!isExternalSticker) {
+		return {
+			canUse: true,
+			isLockedByPremium: false,
+			isLockedByPermission: false,
+		};
+	}
+
+	const hasPermission = PermissionStore.can(Permissions.USE_EXTERNAL_STICKERS, {
+		guildId: channel.guildId,
+		channelId: channel.id,
+	});
+
+	if (!hasPermission) {
+		if (!hasPremium) {
+			return {
+				canUse: false,
+				isLockedByPremium: false,
+				isLockedByPermission: true,
+				lockReason: i18n._(msg`You lack permission to use external stickers in this channel`),
+			};
+		}
+		return {
+			canUse: false,
+			isLockedByPremium: false,
+			isLockedByPermission: true,
+			lockReason: i18n._(msg`You lack permission to use external stickers in this channel`),
+		};
+	}
+
+	if (!hasPremium) {
+		return {
+			canUse: false,
+			isLockedByPremium: true,
+			isLockedByPermission: false,
+			lockReason: i18n._(msg`Unlock external stickers with Plutonium`),
+		};
+	}
+
+	return {
+		canUse: true,
+		isLockedByPremium: false,
+		isLockedByPermission: false,
+	};
+}
+
+export function filterEmojisForAutocomplete(
+	i18n: I18n,
+	emojis: ReadonlyArray<Emoji>,
+	channel: ChannelRecord | null,
+): ReadonlyArray<Emoji> {
+	return emojis.filter((emoji) => {
+		const check = checkEmojiAvailability(i18n, emoji, channel);
+		return check.canUse;
+	});
+}
+
+export function filterStickersForAutocomplete(
+	i18n: I18n,
+	stickers: ReadonlyArray<GuildStickerRecord>,
+	channel: ChannelRecord | null,
+): ReadonlyArray<GuildStickerRecord> {
+	return stickers.filter((sticker) => {
+		const check = checkStickerAvailability(i18n, sticker, channel);
+		return check.canUse;
+	});
+}
+
+export function shouldShowEmojiPremiumUpsell(channel: ChannelRecord | null): boolean {
+	const currentUser = UserStore.getCurrentUser();
+	const hasPremium = currentUser?.isPremium() ?? false;
+
+	if (hasPremium) {
+		return false;
+	}
+
+	if (!channel?.guildId) {
+		return true;
+	}
+
+	const hasPermission = PermissionStore.can(Permissions.USE_EXTERNAL_EMOJIS, {
+		guildId: channel.guildId,
+		channelId: channel.id,
+	});
+
+	return hasPermission;
+}
+
+export function shouldShowStickerPremiumUpsell(channel: ChannelRecord | null): boolean {
+	const currentUser = UserStore.getCurrentUser();
+	const hasPremium = currentUser?.isPremium() ?? false;
+
+	if (hasPremium) {
+		return false;
+	}
+
+	if (!channel?.guildId) {
+		return true;
+	}
+
+	const hasPermission = PermissionStore.can(Permissions.USE_EXTERNAL_STICKERS, {
+		guildId: channel.guildId,
+		channelId: channel.id,
+	});
+
+	return hasPermission;
+}