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// @flow
import type { DBCommunity } from 'shared/types';
import type { GraphQLContext } from '../../';
import { encode, decode } from '../../utils/base64';
import {
getChannelsByUserAndCommunity,
getPublicChannelsByCommunity,
} from '../../models/channel';
import { getThreadsByChannels } from '../../models/thread';
import { canViewCommunity } from '../../utils/permissions';
export type CommunityThreadConnectionPaginationOptions = {
after: string,
first: number,
sort: 'latest' | 'trending',
};
// prettier-ignore
export default async (root: DBCommunity, args: CommunityThreadConnectionPaginationOptions, ctx: GraphQLContext) => {
const { first = 10, after, sort = 'latest' } = args
const { user, loaders } = ctx
const { id } = root
if (!await canViewCommunity(user, id, loaders)) {
return {
pageInfo: {
hasNextPage: false,
},
edges: []
}
}
const cursor = decode(after);
// Get the index from the encoded cursor, asdf234gsdf-2 => ["-2", "2"]
const lastDigits = cursor.match(/-(\d+)$/);
const lastThreadIndex =
lastDigits && lastDigits.length > 0 && parseInt(lastDigits[1], 10) || 0;
const currentUser = user;
// if the user is signed in, only return stories for the channels
// the user is a member of -> this will ensure that they don't see
// stories in private channels that they aren't a member of.
// if the user is *not* signed in or not a member, only get threads
// from public channels within the community
let channels;
let isMember = false;
if (user) {
const permissions = await loaders.userPermissionsInCommunity.load([
user.id,
id,
]);
isMember = permissions && permissions.isMember;
}
if (user && isMember) {
channels = await getChannelsByUserAndCommunity(id, currentUser.id);
} else {
channels = await getPublicChannelsByCommunity(id);
}
const threads = await getThreadsByChannels(channels, {
first,
after: lastThreadIndex,
sort,
});
return {
pageInfo: {
hasNextPage: threads && threads.length >= first,
},
edges: threads.map((thread, index) => ({
cursor: encode(`${thread.id}-${lastThreadIndex + index + 1}`),
node: thread,
})),
};
};
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