rtdb.mjs

// Adapter for Realtime Database
export const installRtdbRedirect = (app) => app.all("/.lp", async (req, res, next) => {
    // Parse ns param
    // https://webcode.run/.lp?start=t&ser=88616779&cb=1&v=5&ns=tomlarkworthy|notebook-name;ep
    const decoded = parseNS(req.query.ns);
    if (decoded) {
        req.url = `/observablehq.com/${decoded.namespace ? `@${decoded.namespace}/`: ''}${decoded.notebook};${decoded.deploy}`;
        app.handle(req, res);
    } else {
        next()
    }
});

export const parseNS = (ns) => {
    const match = /([^|]*)\|([^;]*)(?:;(.*))?$/.exec(ns)
    if (!match) return undefined
    if (match[1] === 'd') {
        return {
            notebook: 'd/' + match[2],
            deploy: match[3] || "default"
        }
    } else {
        return {
            namespace: match[1],
            notebook: match[2],
            deploy: match[3] || "default"
        }
    }
}