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import { APObject, APOrderedCollection } from "activitypub-types";
import { Request } from "express";
interface ActivityPubable {
toAP(): APObject;
}
export const makeOrderedCollection = async <T extends ActivityPubable>(
req: Request,
id: string,
getTotalElements: () => Promise<number>,
getElements: (before?: string, after?: string) => Promise<T[]>,
): Promise<APOrderedCollection> => {
const { page, min_id, max_id } = req.query;
if (!page)
return {
"@context": "https://www.w3.org/ns/activitystreams",
id: id,
type: "OrderedCollection",
first: `${id}?page=true`,
last: `${id}?page=true&min_id=0`,
};
const after = min_id ? `${min_id}` : undefined;
const before = max_id ? `${max_id}` : undefined;
const elems = await getElements(before, after);
const items = elems.map((elem) => elem.toAP());
return {
"@context": "https://www.w3.org/ns/activitystreams",
id: `${id}?page=true`,
type: "OrderedCollection",
first: `${id}?page=true`,
last: `${id}?page=true&min_id=0`,
totalItems: await getTotalElements(),
items: items,
};
};
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