nostr-hooks/dist/nip29/queries/use-group-roles/index.js

React hooks for developing Nostr clients

import { useEffect, useMemo } from 'react';
import { useSubscription } from '../../../hooks';
import { useNip29Store } from '../../../nip29/store';
const updateGroupRoles = useNip29Store.getState().updateGroupRoles;
export const useGroupRoles = (relay, groupId) => {
    const subId = relay && groupId ? `${relay}-${groupId}-roles` : undefined;
    const roles = useNip29Store((state) => subId && groupId ? state.groups[subId]?.[groupId]?.roles : undefined);
    const { events, eose, createSubscription } = useSubscription(subId);
    useEffect(() => {
        if (!relay || !groupId || !subId)
            return;
        const filters = [{ kinds: [39003], '#d': [groupId], limit: 1 }];
        const relayUrls = [relay];
        const onEvent = (event) => {
            const roles = event
                .getMatchingTags('role')
                .filter((t) => t.length > 1)
                .map((t) => {
                let r = { name: t[1] || '' };
                if (t.length > 2)
                    r.description = t[2] || '';
                return r;
            });
            updateGroupRoles(subId, groupId, roles);
        };
        createSubscription({ filters, relayUrls, onEvent });
    }, [subId, relay, groupId, createSubscription]);
    const isLoading = useMemo(() => (!events || events.length == 0) && !eose, [events, eose]);
    return {
        roles,
        isLoadingRoles: isLoading,
        rolesEvents: events,
    };
};
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