File size: 1,696 Bytes
1e92f2d |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 |
// @flow
import type { PaginationOptions } from '../../utils/paginate-arrays';
import type { GraphQLContext } from '../../';
import { canViewDMThread } from '../../utils/permissions';
import { encode, decode } from '../../utils/base64';
import { getMessages } from '../../models/message';
export default async (
{ id }: { id: string },
{ first, after }: PaginationOptions,
{ user, loaders }: GraphQLContext
) => {
if (!user || !user.id) return null;
const canViewThread = await canViewDMThread(user.id, id, loaders);
if (!canViewThread) return null;
const cursor = parseInt(decode(after), 10);
const messages = await getMessages(id, {
// NOTE(@mxstbr): We used to use first/after for reverse DM pagination
// so we have to keep it that way for backwards compat, but really this
// should be last/before since it's in the other way of time
last: first || 30,
before: cursor,
});
return {
pageInfo: {
hasNextPage: messages && messages.length >= first,
// NOTE(@mxstbr): For DM threads we just assume there to be a previous page
// if the user provided a cursor and there were at least some messages
// That way they might get a false positive here if they request the messages before the last message
// but since that query returns no messages this will be false and all will be well
// (so it essentially just takes 1 “unnecessary” request to figure out whether or not there is a previous page)
hasPreviousPage: messages && messages.length > 0 && !!cursor,
},
edges: messages.map(message => ({
cursor: encode(message.timestamp.getTime().toString()),
node: message,
})),
};
};
|