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import { APOrderedCollection, AnyAPObject } from "activitypub-types";
import { ACTIVITYSTREAMS_CONTEXT } from "./utils";
export const makeOrderedCollection = async <T extends AnyAPObject>(opts: {
page: boolean;
min_id?: string;
max_id?: string;
id: string;
getTotalElements: () => Promise<number>;
getElements: (before?: string, after?: string) => Promise<T[]>;
}): Promise<APOrderedCollection> => {
const { page, min_id, max_id, id, getTotalElements, getElements } = opts;
if (!page)
return {
"@context": ACTIVITYSTREAMS_CONTEXT,
id: id,
type: "OrderedCollection",
totalItems: await getTotalElements(),
first: new URL(`${id}?page=true`),
last: new URL(`${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);
// TODO: we need to specify next/prev props
// and should probably let the caller of this function specify what they are
// along with first/last
return {
"@context": ACTIVITYSTREAMS_CONTEXT,
id: `${id}?page=true`,
type: "OrderedCollection",
first: new URL(`${id}?page=true`),
last: new URL(`${id}?page=true&min_id=0`),
totalItems: await getTotalElements(),
orderedItems: elems,
};
};
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