refactoring

Resolve #7779

packages/backend/src/server/api/endpoints/users/groups/show.ts

@@ -0,0 +1,55 @@
+import $ from 'cafy';
+import { ID } from '@/misc/cafy-id';
+import define from '../../../define';
+import { ApiError } from '../../../error';
+import { UserGroups, UserGroupJoinings } from '@/models/index';
+
+export const meta = {
+	tags: ['groups', 'account'],
+
+	requireCredential: true as const,
+
+	kind: 'read:user-groups',
+
+	params: {
+		groupId: {
+			validator: $.type(ID),
+		},
+	},
+
+	res: {
+		type: 'object' as const,
+		optional: false as const, nullable: false as const,
+		ref: 'UserGroup',
+	},
+
+	errors: {
+		noSuchGroup: {
+			message: 'No such group.',
+			code: 'NO_SUCH_GROUP',
+			id: 'ea04751e-9b7e-487b-a509-330fb6bd6b9b'
+		},
+	}
+};
+
+export default define(meta, async (ps, me) => {
+	// Fetch the group
+	const userGroup = await UserGroups.findOne({
+		id: ps.groupId,
+	});
+
+	if (userGroup == null) {
+		throw new ApiError(meta.errors.noSuchGroup);
+	}
+
+	const joining = await UserGroupJoinings.findOne({
+		userId: me.id,
+		userGroupId: userGroup.id
+	});
+
+	if (joining == null && userGroup.userId !== me.id) {
+		throw new ApiError(meta.errors.noSuchGroup);
+	}
+
+	return await UserGroups.pack(userGroup);
+});