bliss/index.js

const fs = require("fs");
const util = require("util");
const vm = require("node:vm");
const path = require("path");
require('dotenv').config()
const express = require("express");
const session = require("express-session");
const fileUpload = require("express-fileupload");
const SQLiteStore = require("better-sqlite3-session-store")(session);
const { Eta } = require("eta");
const { match } = require("path-to-regexp");
const bcrypt = require("bcrypt");
const cheerio = require("cheerio");
const webPush = require("web-push");
const app = express();
const _expressWs = require("express-ws")(app);
const bodyParser = require("body-parser");
const model = require("./db");
const PORT = 3000;

const db = model.db;
const wsRouter = express.Router()

let viewpath = path.join(__dirname, "views");
let eta = new Eta({ views: viewpath, cache: false, autoEscape: true });

let routes = { GET: [], POST: [], PUT: [], DELETE: [] };
const wsRoutes = {}
const wsConnections = {}

const INSPECT_OPTS = { showHidden: false, depth: null, colors: false, compact: false };
function inspectArgs(args) {
  return args.map((v) => util.inspect(v, INSPECT_OPTS)).join(" ");
}

function formatError(e) {
  return e.stack ? `${e}\n\n${e.stack}` : `${e}`;
}

// Record a handler error in the structure's logs table.
function logError(structureId, routeId, e) {
  model.createLog(structureId, routeId, formatError(e), true);
}

app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
app.use(express.static("public"));
app.use(fileUpload());
app.use(
  session({
    store: new SQLiteStore({ client: db, expired: { clear: true } }),
    secret: "your secret key",
    resave: false,
    saveUninitialized: true,
    cookie: { secure: false },
  }),
);

app.use("/", wsRouter);

const vapidPublicKey = process.env.VAPID_PUBLIC_KEY
const vapidPrivateKey = process.env.VAPID_PRIVATE_KEY

// Configure web-push with your VAPID details
webPush.setVapidDetails(
  "mailto:signups@sheepmail.net", // a mailto URL or URL
  vapidPublicKey,
  vapidPrivateKey,
);

async function saveFile(structureId, req, uploadedFile, asset=false) {
  const name = uploadedFile.name;
  const [mime_type, mime_subtype] = uploadedFile.mimetype.split("/");
  const uploadPath = path.join(__dirname, "public", structureId);
  const storedPath = path.join(structureId, uploadedFile.name);

  fs.mkdirSync(uploadPath, { recursive: true });

  await uploadedFile.mv(path.join(uploadPath, name));
  let id = model.createFile(
    structureId,
    name,
    storedPath,
    mime_type,
    mime_subtype,
    asset,
  );

  let file = model.getFile(id);
  file.url = prefixUrlWithHost(req, file.path);

  return file
}

// A console whose log() mirrors to stdout and to the structure's logs table.
function makeConsole(structureId, routeId) {
  return {
    log: function (...content) {
      content.forEach((c) => console.log(c));
      model.createLog(structureId, routeId, inspectArgs(content));
    },
  };
}

// Evaluate a db's "library" script with `sql` and `console` bound, returning
// its exports. Each library runs in its own context so nothing leaks between dbs.
function runLibrary(sql, librarySource, console) {
  const libContext = vm.createContext({ sql, console, module: { exports: null } });
  vm.runInContext(librarySource, libContext);
  return libContext.module.exports;
}

// The `require(name)` targets available to a user handler.
function makeLibs(structureId, console) {
  const dbs = {};
  for (let appDb of model.getDbsForStructure(structureId)) {
    const sql = model.getDbInstance(appDb.id);
    dbs[appDb.alias] = { library: runLibrary(sql, appDb.library, console), sql };
  }
  return {
    eta: model.getTemplater(structureId),
    db: (alias) => dbs[alias],
    push: webPush,
    files: { saveFile: (...args) => saveFile(structureId, ...args) },
  };
}

function bootstrapContext(structureId, routeId, initContext) {
  const structure = model.getStructure(structureId);
  const console = makeConsole(structureId, routeId);
  const libs = makeLibs(structureId, console);

  return vm.createContext({
    ...initContext,
    require: (name) => libs[name],
    module: { exports: null },
    console,
    vapidPublicKey: vapidPublicKey,
    fetch: fetch,
    clearTimeout: clearTimeout,
    setTimeout: setTimeout,
    route: makeRoute(structure),
  });
}

function withPrefix(prefix, url) {
  return prefix ? path.join(prefix, url) : url;
}

function routeWithPrefix(route) {
  return withPrefix(route.route_prefix, route.path);
}


function bootstrapWebsocketHandler(route) {
  // todo only expose app when running the handler, should not be available to the handler itself
  // need to move to runscript or whatever...or remove app because we can just call it using the handler?
  try {
    const context = bootstrapContext(route.structure_id, route.id, { app });
    let handler = vm.runInContext(`${route.handler}\n\nhandler;`, context);

    if (!wsRoutes[routeWithPrefix(route)]) {
      wsConnections[routeWithPrefix(route)] = new Set();
      // initialize ws router. future updates will only require updating
      // the wsRoutes dict, not create a whole new route
      wsRouter.ws(routeWithPrefix(route), (ws, req) => {
        const myOn = ws.on.bind(ws)
        ws.on = (thing, cb) => {
          myOn(thing, (...args) => {
            try {
              cb(...args)
            }
            catch (e) {
              logError(route.structure_id, route.id, e);
            }
          })
        }
        ws.render = (template, context = {}) => {
          const structure = model.getStructure(route.structure_id);
          context.route = makeRoute(structure);
          ws.send(
            decorate(renderTemplate(route.structure_id, template, context), {
              headInjection: structure.head_injection,
              source: sourceFor(route, req),
              fragment: true,
            }),
          );
        };

        ws.clients = wsConnections[routeWithPrefix(route)];

        return wsRoutes[routeWithPrefix(route)](ws, req)
      });
    }

    wsRoutes[routeWithPrefix(route)] = (ws, req) => {
      try {
        return handler(ws, req)
      } catch (e) {
         logError(route.structure_id, route.id, e);
      }
    }
    model.updateRoute({ ...route, error: null });
  } catch (e) {
    logError(route.structure_id, route.id, e);
    model.updateRoute({ ...route, error: e.stack });
  }
}

function buildRoutes() {
  let newRoutes = {
    GET: [],
    POST: [],
    PUT: [],
    DELETE: [],
  };

  for (let route of model.getAllRoutes()) {
    const p = routeWithPrefix(route);
    if (route.verb == "WS") {
      bootstrapWebsocketHandler(route);
    } else {
      newRoutes[route.verb].push({
        matcher: match(p, { decode: decodeURIComponent }),
        id: route.id,
        path: route.path,
      });
    }
  }
  routes = newRoutes;
}

model.applyMigrations();
buildRoutes();

// __   __  _______  _______  ______
// |  | |  ||       ||       ||    _ |
// |  | |  ||  _____||    ___||   | ||
// |  |_|  || |_____ |   |___ |   |_||_
// |       ||_____  ||    ___||    __  |
// |       | _____| ||   |___ |   |  | |
// |_______||_______||_______||___|  |_|

app.post("/register", async (req, res) => {
  try {
    const { username, password } = req.body;
    const hashedPassword = await bcrypt.hash(password, 10); // 10 is the saltRounds
    const userId = model.createUser(username, hashedPassword);
    req.session.userId = userId;
    res.redirect("/workshop");
  } catch (e) {
    return res.send(eta.render("auth/register", { error: e }));
  }
});

app.post("/login", async (req, res) => {
  const { username, password } = req.body;
  const user = model.getUser(username);

  if (user && (await bcrypt.compare(password, user.password))) {
    req.session.userId = user.id;
    return res.redirect("/");
  }

  return res.send(
    eta.render("auth/login", {
      error: "are you sure you entered that right?",
    }),
  );
});

app.get("/register", async (req, res) => {
  if (req.session.userId) {
    return res.redirect("/");
  }
  return res.send(eta.render("auth/register", { error: null }));
});

app.get("/login", async (req, res) => {
  if (req.session.userId) {
    return res.redirect("/");
  }
  return res.send(eta.render("auth/login", { error: null }));
});

app.all("/logout", async (req, res) => {
  return req.session.destroy(() => {
    res.redirect("/");
  });
});

// _     _  _______  ______    ___   _  _______  __   __  _______  _______
// | | _ | ||       ||    _ |  |   | | ||       ||  | |  ||       ||       |
// | || || ||   _   ||   | ||  |   |_| ||  _____||  |_|  ||   _   ||    _  |
// |       ||  | |  ||   |_||_ |      _|| |_____ |       ||  | |  ||   |_| |
// |       ||  |_|  ||    __  ||     |_ |_____  ||       ||  |_|  ||    ___|
// |   _   ||       ||   |  | ||    _  | _____| ||   _   ||       ||   |
// |__| |__||_______||___|  |_||___| |_||_______||__| |__||_______||___|
//
// The chrome injected into the <head> of every rendered page: the client-side
// stack (htmx/hyperscript/tailwind) plus the in-page editor overlay.
function headChrome(headInjection) {
  return `
        <script src="/js/hyperscript.js"></script>
        <script src="/js/tailwind.js"></script>
        <script src="/js/htmx.js"></script>
        <script src="https://unpkg.com/htmx.org@1.9.12/dist/ext/ws.js"></script>
        <script src="/js/bliss_inspector.js"></script>
        <script>
          tailwind.config = {
              corePlugins: {
              preflight: false
            }
          }
        </script>
        <style> body { margin: 0; }</style>
        ${headInjection || ""}
    `;
}

// A `source` is the provenance of a rendered fragment: which structure/route
// produced it, and (for GET routes) the snippet that re-embeds it. It becomes
// the data-bliss-* attributes the inspector reads.
function blissAttrs(source) {
  if (!source) return null;
  const attrs = {
    "data-bliss-route": `/workshop/${source.structureId}/route/${source.routeId}`,
    "data-bliss-clone": `/workshop/${source.structureId}/clone_modal/`,
  };
  if (source.copyUrl) attrs["data-bliss-copy"] = source.copyUrl;
  return attrs;
}

// Full HTML document: inject the head chrome and stamp provenance on <body>.
function decoratePage(html, { headInjection, source } = {}) {
  const $ = cheerio.load(html);
  let head = $("head");
  if (head.length === 0) {
    $("html").prepend("<head></head>");
    head = $("head");
  }
  head.attr("id", "head");
  head.append(headChrome(headInjection));

  const attrs = blissAttrs(source);
  if (attrs) {
    for (const [k, v] of Object.entries(attrs)) $("body").attr(k, v);
  }
  return $.html();
}

// HTMX partial: stamp provenance on the swapped-in elements (an oob swap loses
// its own attrs, so we descend into its children) and append an out-of-band
// <head> so head injection still reaches the page.
function decorateFragment(html, { headInjection, source } = {}) {
  const $ = cheerio.load(html, null, false);
  const attrs = blissAttrs(source);
  if (attrs) {
    const targets = [];
    for (const child of $.root().children()) {
      if (child.attribs && child.attribs["hx-swap-oob"]) {
        for (const grandchild of child.children) {
          if (grandchild.attribs) targets.push(grandchild);
        }
      } else {
        targets.push(child);
      }
    }
    for (const target of targets) Object.assign(target.attribs, attrs);
  }
  return (
    $.html() +
    `<head id="head" hx-oob-swap="beforeend">${headInjection || ""}</head>`
  );
}

// Single entry point for turning rendered HTML into a response body. A full
// document (or any non-htmx request) becomes a decorated page; an htmx partial
// carrying provenance becomes a decorated fragment; anything else passes through.
function decorate(html, { headInjection, source, fragment } = {}) {
  const lower = html.toLowerCase();
  const isFullDoc =
    lower.startsWith("<html>") || lower.startsWith("<!doctype");
  if (isFullDoc || !fragment) {
    return decoratePage(html, { headInjection, source });
  }
  if (source) return decorateFragment(html, { headInjection, source });
  return html;
}

// One prefix-bound route() helper per structure, shared by every render site.
function makeRoute(structure) {
  return (url) => withPrefix(structure.route_prefix, url);
}

function renderTemplate(structureId, templateName, context) {
  return model.getTemplater(structureId).render(templateName, context);
}

// Provenance for a rendered response: GET routes are re-embeddable, so they
// carry the copy-embed snippet; other verbs don't.
function sourceFor(route, req) {
  return {
    structureId: route.structure_id,
    routeId: route.id,
    copyUrl: route.verb === "GET" ? embedHTML(req.originalUrl) : null,
  };
}

app.post("/workshop", (req, res) => {
  let structId = model.createStructure(req.body.name);
  return res.redirect("/workshop/" + structId);
});

app.get("/workshop", (req, res) => {
  return renderWorkshop(res, "workshop/index", {
    structures: model.getStructures(),
  });
});

function renderWorkshop(res, template, context) {
  res.send(decorate(eta.render(template, context)));
}

function smartRedirect(req, res, redirectUrl) {
  if (req.headers["hx-request"]) {
    res.set("HX-Redirect", redirectUrl);
    res.send();
  } else {
    res.redirect(redirectUrl);
  }
}

function sidebarStuff(structId) {
  return {
    structure: model.getStructure(structId),
    routes: model.getRoutes(structId),
    templates: model.getTemplates(structId),
    dbs: model.getDbsForStructure(structId),
  };
}

app.get("/workshop/:structure_id", (req, res) => {
  return renderWorkshop(res, "workshop/editor", sidebarStuff(req.params.structure_id));
});

app.post("/workshop/:structure_id/clone", (req, res) => {
  let routePrefix = req.body.route_prefix;
  routePrefix = routePrefix[0] == "/" ? routePrefix : "/" + routePrefix;
  let newStructureId;
  try {
    newStructureId = model.cloneStructure(
      req.params.structure_id,
      req.body.name,
      1,
      // req.session.userId,
      routePrefix,
      req.body.clone_dbs,
    );
    buildRoutes();
  } catch (e) {
    return res.send(e.stack);
  }
  return smartRedirect(req, res, `/workshop/${newStructureId}`);
});

app.post("/workshop/:structure_id/db", (req, res) => {
  const dbId = model.createDb(req.params.structure_id, req.body.name);
  const redirectUrl = `/workshop/${req.params.structure_id}/db/${dbId}`;
  return smartRedirect(req, res, redirectUrl);
});

app.post("/workshop/:structure_id/db/attach", (req, res) => {
  model.attachDb(req.params.structure_id, req.body.db_id, req.body.alias);
  const redirectUrl = `/workshop/${req.params.structure_id}/db/${req.body.db_id}`;
  return smartRedirect(req, res, redirectUrl);
});

app.get("/workshop/:structure_id/db/:db_id", (req, res) => {
  const structdb = model.getDbForStructure(
    req.params.structure_id,
    req.params.db_id,
  );
  if (!structdb) {
    return res.send("uh oh");
  }
  return renderWorkshop(res, "workshop/db_garden", {
    db: structdb,
    ...sidebarStuff(req.params.structure_id),
  });
});

app.post("/workshop/:structure_id/route", (req, res) => {
  let p = req.body.path;

  let dummyHandler =
    "// put your handler code here\n\nfunction handler(req, res) {\n  res.send('henlo world') \n}";

  if (req.body.verb == "WS") {
    dummyHandler = `// put your websocket handler code here\n\nfunction handler(ws, req) {\n  ws.on('message', function(msg) {\n    ws.send(msg);\n  })\n}`;
  }

  if (p[0] == "/") {
    p = p.substring(1);
  }
  if (p[p.length - 1] == "/") {
    p = p.substring(0, p.length - 1);
  }
  const route = model.createRoute(
    req.body.verb,
    p[0] == "/" ? p.substring(1) : "/" + p,
    req.params.structure_id,
    dummyHandler,
  );
  // todo optimize by only adding new, don't just rebuild all
  buildRoutes();
  return smartRedirect(
    req,
    res,
    `/workshop/${req.params.structure_id}/route/${route}`,
  );
});

app.put("/workshop/:structure_id/route/:route_id", (req, res) => {
  const route = model.getRoute(req.params.route_id);
  model.updateRoute({ ...route, ...req.body });
  if (req.body.scaffold_page) {
    // TODO: make this send over scaffold page id too someday
    const latestPage = model.getLatestScaffoldPage(req.params.route_id)
    model.updateScaffoldPage({ ...latestPage, content: req.body.scaffold_page })
  }
  if (route.verb == "WS") {
    bootstrapWebsocketHandler({ ...route, ...req.body })
  }
  return res.send("good");
});

app.put("/workshop/:structure_id/db/:db_id/library", (req, res) => {
  try {
    let dbId = req.params.db_id;
    let appDb = model.getDb(dbId);
    model.updateDb({ ...appDb, library: req.body.library });
    appDb = model.getDb(dbId);

    let dbInstance = model.getDbInstance(dbId);
    let capturedOutput = [];
    let context = vm.createContext({
      module: { exports: null },
      sql: dbInstance,
      console: {
        log: (...args) => capturedOutput.push(inspectArgs(args)),
      },
    });
    let evaledCode = vm.runInContext(appDb.library, context);
    let stdout = capturedOutput.join("\n");
    return res.send(`${stdout}\n\n> ${evaledCode}`.trim());
  } catch (e) {
    return res.send(`${e}\n\n${e.stack}`);
  }
});

app.post("/workshop/:structure_id/db/:db_id/repl", (req, res) => {
  try {
    let dbId = req.params.db_id;
    let appDb = model.getDb(dbId);
    let dbInstance = model.getDbInstance(dbId);
    let capturedOutput = [];
    let context = vm.createContext({
      module: { exports: null },
      sql: dbInstance,
      console: {
        log: (...args) => capturedOutput.push(inspectArgs(args)),
      },
    });
    const libraryScript = new vm.Script(appDb.library);
    libraryScript.runInContext(context);
    context.library = context.module.exports;
    const replScript = new vm.Script(req.body.code);
    let evaledCode = JSON.stringify(replScript.runInContext(context));
    let stdout = capturedOutput.join("\n");
    return res.send(`${stdout}\n\n> ${evaledCode}`.trim());
  } catch (e) {
    return res.send(`${e}\n\n${e.stack}`);
  }
});

app.post("/workshop/:structure_id/template", (req, res) => {
  let name = req.body.name;

  const template = model.createTemplate(
    req.params.structure_id,
    name,
    "<div>henlo <%= it.name %></div>",
    "it = { name: 'templates!' };",
  );

  return smartRedirect(
    req,
    res,
    `/workshop/${req.params.structure_id}/template/${template}`,
  );
});

app.put("/workshop/:structure_id/template/:template_id", (req, res) => {
  let id = req.params.template_id;
  let content = req.body.content;
  let test_object = req.body.test_object;

  model.updateTemplate({
    ...model.getTemplate(id),
    content,
    test_object,
  });

  return res.send("good");
});

app.get("/workshop/:structure_id/template/:template_id", (req, res) => {
  const template = model.getTemplate(req.params.template_id);

  return renderWorkshop(res, "workshop/template", {
    template: template,
    ...sidebarStuff(req.params.structure_id),
  });
});

app.get("/workshop/:structure_id/template/:template_id/preview", (req, res) => {
  const template = model.getTemplate(req.params.template_id);
  const struct = model.getStructure(req.params.structure_id);

  const context = vm.createContext({ it: null });
  vm.runInContext(template.test_object, context);

  context.it.route = makeRoute(struct);

  return res.send(
    decorate(renderTemplate(req.params.structure_id, template.name, context.it), {
      headInjection: struct.head_injection,
    }),
  );
});

app.get("/workshop/:structure_id/route/:id", (req, res) => {
  const route = model.getRoute(req.params.id);
  let routePrefix = model.getStructure(req.params.structure_id).route_prefix;
  let previewUrl = null;

  if (route["verb"] == "GET" ) {
    previewUrl = routePrefix
      ? path.join(routePrefix || "", route.path)
      : route.path;
  }
  else {
    previewUrl = `/workshop/${req.params.structure_id}/route/${req.params.id}/preview`;
  }

  const template = route["verb"] == "GET" ? "workshop/route" : "workshop/cud_route";

  return renderWorkshop(res, template, {
    route: route,
    previewUrl: previewUrl,
    ...sidebarStuff(req.params.structure_id),
  });
});

app.get("/workshop/:structure_id/route/:route_id/preview", (req, res) => {
  const route = model.getRoute(req.params.route_id);
  const struct = model.getStructure(req.params.structure_id);

  const it = { route: makeRoute(struct) };

  return res.send(
    decorate(eta.renderString(route.scaffold_page_content, it), {
      headInjection: struct.head_injection,
    }),
  );
});

app.get("/workshop/:structure_id/route/:route_id/logs", (req, res) => {
  const since = req.query.since;
  let logs = [];
  if (since != undefined) {
    logs = model.getNewLogsByRoute(req.params.route_id, since);
  } else {
    logs = model.getLogsByRoute(req.params.route_id);
  }

  const lastId = model.getMostRecentLogIdByRoute(req.params.route_id);

  return renderWorkshop(res, "workshop/logs", {
    logs: logs,
    structId: req.params.structure_id,
    routeId: req.params.route_id,
    since: lastId,
  });
});

// POST route to handle file upload
app.post("/workshop/:structure_id/files", async (req, res) => {
  if (!req.files || Object.keys(req.files).length === 0) {
    return res.status(400).send("failed to upload that file");
  }

  const { structure_id } = req.params;
  const targetFile = req.files.file;

  try {
    const uploadedFile = await saveFile(structure_id, req, targetFile)
    return res.send(eta.render("workshop/file_detail", { file: uploadedFile }));
  }
  catch (e) {
    console.log(e)
      res.status(500);
      return res.send(e);
  }

});

function prefixUrlWithHost(req, path) {
  return req.protocol + "://" + req.get("host") + "/" + path;
}

// POST route to handle file upload
app.get("/workshop/:structure_id/files", (req, res) => {
  const { structure_id } = req.params;

  const files = model.getFilesForStruct(structure_id);
  files.map((it) => {
    it.url = prefixUrlWithHost(req, it.path);
  });

  return renderWorkshop(res, "workshop/files", {
    files,
    ...sidebarStuff(structure_id),
  });
});

app.get("/workshop/:structure_id/settings", (req, res) => {
  return renderWorkshop(res, "workshop/settings", {
    ...sidebarStuff(req.params.structure_id),
  });
});

app.put("/workshop/:structure_id/settings", (req, res) => {
  let structId = req.params.structure_id;
  let struct = model.getStructure(structId);
  let routePrefix = req.body.route_prefix;

  if (routePrefix[0] != "/") {
    routePrefix = "/" + routePrefix;
  }
  if (routePrefix[routePrefix.length - 1] == "/") {
    routePrefix = routePrefix.substring(0, routePrefix.length - 1);
  }

  model.updateStruct({
    ...struct,
    route_prefix: routePrefix,
    head_injection: req.body.head_injection,
  });
  struct = model.getStructure(structId);

  res.send("success!");
});

app.get("/workshop/:structure_id/new_template_modal", (req, res) => {
  return renderWorkshop(res, "workshop/new_template_modal", {
    structure: model.getStructure(req.params.structure_id),
  });
});

app.get("/workshop/:structure_id/new_route_modal", (req, res) => {
  return renderWorkshop(res, "workshop/new_route_modal", {
    structure: model.getStructure(req.params.structure_id),
  });
});

app.get("/workshop/:structure_id/new_db_modal", (req, res) => {
  return renderWorkshop(res, "workshop/new_db_modal", {
    structure: model.getStructure(req.params.structure_id),
  });
});

app.get("/workshop/:structure_id/clone_modal", (req, res) => {
  const structure = model.getStructure(req.params.structure_id);
  const dbs = model.getDbsForStructure(req.params.structure_id);

  return renderWorkshop(res, "workshop/clone_structure_modal", {
    structure,
    dbs,
    defaultRoutePrefix: path.join(structure.route_prefix || "", "clone"),
  });
});

function embedHTML(url) {
  return `<div hx-get="${url}" hx-trigger="load"></div>`;
}

app.all("*", async (req, res) => {
  const req_path = req.path;
  const verb = req.method;

  try {
    let routeMatch = null;

    // routes[verb] is ordered most-recently-updated first (getAllRoutes sorts
    // by updated_at DESC), so the first match is the most recently saved route.
    for (let { matcher, id } of routes[verb]) {
      let matchFromRoute = matcher(req_path);
      if (matchFromRoute) {
        routeMatch = { params: matchFromRoute.params, id: id };
        break;
      }
    }

    if (routeMatch) {
      req.params = routeMatch.params;
      const route = model.getRoute(routeMatch.id);

      const structure = model.getStructure(route.structure_id);

      try {
        // todo: only add req res to contexst when running the handler()
        // which means moving to runscript instead of runincontext for that
        let context = bootstrapContext(route.structure_id, route.id, {
          req,
          res,
          eta,
        });

        res.render = (template, context = {}) => {
          context.route = makeRoute(structure);
          res.send(
            decorate(renderTemplate(route.structure_id, template, context), {
              headInjection: structure.head_injection,
              source: sourceFor(route, req),
              fragment: req.headers["hx-request"],
            }),
          );
        };
        const handlerScript = new vm.Script(route.handler, { filename: `handler_${route.id}.js` });
        // Prepare the execution code that invokes `handler(req, res)` and awaits it
        const executionScript = new vm.Script(`handler(req, res); `, { filename: `execution_${route.id}.js` });
        await handlerScript.runInContext(context);
        const result = await executionScript.runInContext(context);
      } catch (e) {
        logError(structure.id, route.id, e);
        return res.status(500).send(formatError(e));
      }
    } else {
      res.status(404).json({ success: false, message: "Path not found" });
    }
  } catch (error) {
    console.error(error);
    res.status(500).json({ success: false, message: "Internal server error" });
  }
});

app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});