v3/packages/api/handlers/get-picker-data.ts

import { DiscordUser, GuildSlug, PresentableGuild, SessionData } from '@roleypoly/types';
import { respond, withSession } from '../utils/api-tools';
import { getGuild, getGuildData, getGuildMemberRoles } from '../utils/guild';

const fail = () => respond({ error: 'guild not found' }, { status: 404 });

export const GetPickerData = withSession(
    (session: SessionData) => async (request: Request): Promise<Response> => {
        const url = new URL(request.url);
        const [, , guildID] = url.pathname.split('/');

        if (!guildID) {
            return respond({ error: 'missing guild id' }, { status: 400 });
        }

        const { id: userID } = session.user as DiscordUser;
        const guilds = session.guilds as GuildSlug[];

        // Save a Discord API request by checking if this user is a member by session first
        const checkGuild = guilds.find((guild) => guild.id === guildID);
        if (!checkGuild) {
            return fail();
        }

        const guild = await getGuild(guildID, {
            skipCachePull: url.searchParams.has('__no_cache'),
        });
        if (!guild) {
            return fail();
        }

        const memberRolesP = getGuildMemberRoles({
            serverID: guildID,
            userID,
        });

        const guildDataP = getGuildData(guildID);

        const [guildData, memberRoles] = await Promise.all([guildDataP, memberRolesP]);
        if (!memberRoles) {
            return fail();
        }

        const presentableGuild: PresentableGuild = {
            id: guildID,
            guild: checkGuild,
            roles: guild.roles,
            member: {
                roles: memberRoles,
            },
            data: guildData,
        };

        return respond(presentableGuild);
    }
);