Myrient-Search-Engine/server.js

import getAllFiles from "./lib/dircrawl.js";
import FileHandler from "./lib/filehandler.js";
import Searcher from "./lib/search.js";
import cron from "node-cron";
import "dotenv/config";
import express from "express";
import http from "http";
import sanitize from "sanitize";
import debugPrint from "./lib/debugprint.js";
import compression from "compression";
import { generateAsciiArt } from './lib/asciiart.js';
import { getEmulatorConfig, isEmulatorCompatible, isNonGameContent } from './lib/emulatorConfig.js';
import fetch from 'node-fetch';
import { initDB, File, QueryCount } from './lib/database.js';
import { initElasticsearch } from './lib/services/elasticsearch.js';

let categoryListPath = "./lib/categories.json"
let searchAlikesPath = './lib/searchalikes.json'
let nonGameTermsPath = './lib/nonGameTerms.json'
let emulatorsPath = './lib/emulators.json'
let categoryList = await FileHandler.parseJsonFile(categoryListPath);
global.searchAlikes = await FileHandler.parseJsonFile(searchAlikesPath)
let nonGameTerms = await FileHandler.parseJsonFile(nonGameTermsPath);
let emulatorsData = await FileHandler.parseJsonFile(emulatorsPath);
let crawlTime = 0;
let queryCount = 0;
let fileCount = 0;
let indexPage = "pages/index";

// Initialize databases
await initDB();
await initElasticsearch();

// Get initial counts
fileCount = await File.count();
crawlTime = (await File.max('updatedAt'))?.getTime() || 0;
queryCount = (await QueryCount.findOne())?.count || 0;

let searchFields = ["filename", "category", "type", "region"];

let defaultSettings = {
  boost: {},
  combineWith: "AND",
  fields: searchFields,
  fuzzy: 0,
  prefix: true,
};

//programmatically set the default boosts while reducing overhead when adding another search field
for (let field in searchFields) {
  let fieldName = searchFields[field];
  if (searchFields[field] == "filename") {
    defaultSettings.boost[fieldName] = 2;
  } else {
    defaultSettings.boost[fieldName] = 1;
  }
}

let search = new Searcher(searchFields);

async function getFilesJob() {
  console.log("Updating the file list.");
  fileCount = await getAllFiles(categoryList);
  if(!fileCount) {
    console.log("File update failed");
    return;
  }
  crawlTime = Date.now();
  console.log(`Finished updating file list. ${fileCount} found.`);
}

function buildOptions(page, options) {
  return { page: page, ...options, ...defaultOptions };
}

let defaultOptions = {
  crawlTime: crawlTime,
  queryCount: queryCount,
  fileCount: fileCount,
  termCount: 0,
  generateAsciiArt: generateAsciiArt,
  isEmulatorCompatible: isEmulatorCompatible
};

function updateDefaults(){
  defaultOptions.crawlTime = crawlTime;
  defaultOptions.queryCount = queryCount;
  defaultOptions.fileCount = fileCount;
}

let app = express();
let server = http.createServer(app);
app.use(sanitize.middleware);
app.use(compression())
app.use(express.json())
app.set("view engine", "ejs");

app.get("/", function (req, res) {
  let page = "search";
  res.render(indexPage, buildOptions(page));
});

app.get("/search", async function (req, res) {
  let query = req.query.q ? req.query.q : "";
  let pageNum = parseInt(req.query.p)
  let urlPrefix = encodeURI(`/search?s=${req.query.s}&q=${req.query.q}&p=`)
  pageNum = pageNum ? pageNum : 1
  let settings = {};
  try {
    settings = req.query.s ? JSON.parse(atob(req.query.s)) : defaultSettings;
  } catch {
    debugPrint("Search settings corrupt, forcing default.");
    settings = defaultSettings;
  }
  for (let key in defaultSettings) {
    let failed = false;
    if (typeof settings[key] != "undefined") {
      if (typeof settings[key] != typeof defaultSettings[key]) {
        debugPrint("Search settings corrupt, forcing default.");
        failed = true;
        break;
      }
    }
    if (failed) {
      settings = defaultSettings;
    }
  }
  if (settings.combineWith != "AND") {
    delete settings.combineWith;
  }
  let results = await search.findAllMatches(query, settings);
  debugPrint(results);
  if(results.items.length && pageNum == 1){
    queryCount += 1;
    await QueryCount.update(
      { count: queryCount },
      { where: { id: 1 } }
    );
    updateDefaults()
  }
  let options = {
    query: query,
    results: results,
    pageNum: pageNum,
    indexing: search.indexing,
    urlPrefix: urlPrefix
  };
  let page = "results";
  options = buildOptions(page, options);
  res.render(indexPage, options);
});

app.get("/lucky", async function (req, res) {
  let results = { items: [] };
  if (req.query.q) {
    let settings = req.query.s ? JSON.parse(atob(req.query.s)) : defaultSettings;
    results = await search.findAllMatches(req.query.q, settings);
    debugPrint(results);
  }
  if (results?.items?.length) {
    res.redirect(results.items[0].path);
  } else {
    const count = await File.count();
    const randomId = Math.floor(Math.random() * count);
    const luckyFile = await File.findOne({
      offset: randomId
    });
    debugPrint(`${randomId}: ${luckyFile?.path}`);
    res.redirect(luckyFile?.path || '/');
  }
  queryCount += 1;
  await QueryCount.update(
    { count: queryCount },
    { where: { id: 1 } }
  );
  updateDefaults()
});

app.get("/settings", function (req, res) {
  let options = { defaultSettings: defaultSettings };
  let page = "settings";
  options = buildOptions(page, options);
  res.render(indexPage, options);
});

app.post("/suggest", async function(req, res){
  if(!req.body){
    return
  }
  if(typeof req.body.query == 'undefined'){
    return
  }
  let suggestions = await search.getSuggestions(req.body.query, defaultSettings)
  debugPrint(suggestions)
  res.setHeader('Content-Type', 'application/json');
  res.end(JSON.stringify({ suggestions }));
})

app.get("/about", function (req, res) {
  let page = "about";
  res.render(indexPage, buildOptions(page));
});

app.get("/play/:id", async function (req, res) {
  // Block access if emulator is disabled
  if (process.env.EMULATOR_ENABLED !== 'true') {
    res.redirect('/');
    return;
  }

  let fileId = parseInt(req.params.id);
  let romFile = await search.findIndex(fileId);

  if (!romFile) {
    res.redirect('/');
    return;
  }

  let options = {
    romFile: romFile,
    emulatorConfig: getEmulatorConfig(romFile.category),
    isNonGame: isNonGameContent(romFile.filename, nonGameTerms)
  };

  let page = "emulator";
  options = buildOptions(page, options);
  res.render(indexPage, options);
});

app.get("/proxy-rom/:id", async function (req, res) {
  // Block access if emulator is disabled
  if (process.env.EMULATOR_ENABLED !== 'true') {
    res.status(403).send('Emulator feature is disabled');
    return;
  }

  let fileId = parseInt(req.params.id);
  let romFile = await search.findIndex(fileId);

  if (!romFile) {
    res.status(404).send('ROM not found');
    return;
  }

  try {
    const response = await fetch(romFile.path);
    const contentLength = response.headers.get('content-length');

    res.setHeader('Content-Type', 'application/zip');
    res.setHeader('Content-Length', contentLength);
    res.setHeader('Content-Disposition', `attachment; filename="${romFile.filename}"`);

    response.body.pipe(res);
  } catch (error) {
    console.error('Error proxying ROM:', error);
    res.status(500).send('Error fetching ROM');
  }
});

app.get("/proxy-bios", async function (req, res) {
  // Block access if emulator is disabled
  if (process.env.EMULATOR_ENABLED !== 'true') {
    res.status(403).send('Emulator feature is disabled');
    return;
  }

  const biosUrl = req.query.url;

  // Validate that URL is from GitHub
  if (!biosUrl || !biosUrl.startsWith('https://github.com')) {
    res.status(403).send('Invalid BIOS URL - only GitHub URLs are allowed');
    return;
  }

  try {
    const response = await fetch(biosUrl);

    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }

    const contentLength = response.headers.get('content-length');
    const contentType = response.headers.get('content-type');

    res.setHeader('Content-Type', contentType || 'application/octet-stream');
    res.setHeader('Content-Length', contentLength);

    response.body.pipe(res);
  } catch (error) {
    console.error('Error proxying BIOS:', error);
    res.status(500).send('Error fetching BIOS file');
  }
});

app.get("/emulators", function (req, res) {
  let page = "emulators";
  let options = { emulators: emulatorsData };
  res.render(indexPage, buildOptions(page, options));
});

app.get("/api/emulators", function (req, res) {
  res.json(emulatorsData);
});

server.listen(process.env.PORT, process.env.BIND_ADDRESS);
server.on("listening", function () {
  console.log(
    "Server started on %s:%s.",
    server.address().address,
    server.address().port
  );
});
console.log(`Loaded ${fileCount} known files.`);

// Run file update job if needed
if (
  process.env.FORCE_FILE_REBUILD == "1" ||
  !fileCount ||
  (crawlTime && Date.now() - crawlTime > 7 * 24 * 60 * 60 * 1000) // 1 week
) {
  await getFilesJob();
}

cron.schedule("0 30 2 * * *", getFilesJob);