@rr0/cms/dist/time/datasource/ArchiveHttpFetcher.js

RR0 Content Management System (CMS)

import { MimeType } from "./HttpSource.js";
import { FetchHttpFetcher } from "./FetchHttpFetcher.js";
export class ArchiveHttpFetcher {
    constructor() {
        this.fetcher = new FetchHttpFetcher();
    }
    async fetch(url, init, resOut, error) {
        const archiveUrl = new URL("http://archive.org/wayback/available?url=" + url);
        const archiveInit = { headers: { "content-type": MimeType.json } };
        const archiveJson = await this.fetcher.fetch(archiveUrl, archiveInit, resOut);
        const closest = archiveJson.archived_snapshots["closest"];
        if (!closest) {
            throw error;
        }
        const archivedUrl = new URL(closest.url);
        const result = await this.fetcher.fetch(archivedUrl, init, resOut);
        const timestamp = closest.timestamp;
        const archiveDate = new Date(timestamp.substring(0, 4) + "-" + timestamp.substring(4, 6) + "-" + timestamp.substring(6, 8) + " "
            + timestamp.substring(8, 10) + ":" + timestamp.substring(10, 12) + ":" + timestamp.substring(12, 14));
        const headers = new Headers(resOut.headers);
        headers.set("last-modified", archiveDate.toString());
        headers.set("host", url.hostname);
        Object.assign(resOut, { url: archivedUrl, headers });
        return result;
    }
}