qinglong/back/loaders/express.ts

import express, { Request, Response, NextFunction, Application } from 'express';
import bodyParser from 'body-parser';
import cors from 'cors';
import routes from '../api';
import config from '../config';
import { UnauthorizedError, expressjwt } from 'express-jwt';
import { getPlatform, getToken } from '../config/util';
import rewrite from 'express-urlrewrite';
import validationErrors from '../middlewares/validationErrors';
import { serveEnv } from '../config/serverEnv';
import { shareStore } from '../shared/store';
import { isValidToken, isDefaultAuthInfo } from '../shared/auth';
import { AuthInfo } from '../data/system';
import path from 'path';
import { t } from '../shared/i18n';
import { AppScope } from '../data/open';
import uniqueConstraintError from '../middlewares/uniqueConstraintError';
import protectedPathCase from '../middlewares/protectedPathCase';

function resolveTrustProxy(value = process.env.QL_TRUST_PROXY) {
  const setting = value?.trim();
  if (!setting) {
    return 'loopback';
  }
  if (setting === 'true' || setting === 'false') {
    return setting === 'true';
  }
  if (/^\d+$/.test(setting)) {
    return Number(setting);
  }
  return setting;
}

export default ({ app }: { app: Application }) => {
  // Security: Enable strict routing to prevent case-insensitive path bypass
  app.set('case sensitive routing', true);
  app.set('strict routing', true);
  app.set('trust proxy', resolveTrustProxy());
  app.use(cors());

  // Security: Reject case variations under protected API namespaces before
  // authentication checks can interpret the request differently from routing.
  app.use(protectedPathCase);

  // Rewrite URLs to strip baseUrl prefix if configured
  // This allows the rest of the app to work without baseUrl awareness
  if (config.baseUrl) {
    app.use(rewrite(`${config.baseUrl}/*`, '/$1'));
  }

  app.get(`${config.api.prefix}/env.js`, serveEnv);
  app.use(
    `${config.api.prefix}/static`,
    express.static(config.uploadPath, {
      setHeaders: (res) => {
        res.setHeader('X-Content-Type-Options', 'nosniff');
        res.setHeader('Content-Security-Policy', "sandbox; default-src 'none'");
      },
    }),
  );

  const credentialPaths = ['/api', '/open'].flatMap((prefix) =>
    ['/user/login', '/user/init', '/user/two-factor/login'].map(
      (route) => `${prefix}${route}`,
    ),
  );
  app.use(
    credentialPaths,
    bodyParser.json({ limit: '16kb' }),
    bodyParser.urlencoded({ limit: '16kb', extended: false }),
  );

  app.use(bodyParser.json({ limit: '50mb' }));
  app.use(bodyParser.urlencoded({ limit: '50mb', extended: true }));

  const frontendPath = path.join(config.rootPath, 'static/dist');
  app.use(express.static(frontendPath));

  app.use(
    expressjwt({
      secret: config.jwt.secret,
      algorithms: ['HS384'],
    }).unless({
      path: [...config.apiWhiteList, /^(\/(?!api\/).*)$/i],
    }),
  );

  app.use((req: Request, res, next) => {
    if (!req.headers) {
      req.platform = 'desktop';
    } else {
      const platform = getPlatform(req.headers['user-agent'] || '');
      req.platform = platform;
    }
    return next();
  });

  app.use(async (req: Request, res, next) => {
    const pathLower = req.path.toLowerCase();
    if (!['/open/', '/api/'].some((x) => pathLower.startsWith(x))) {
      return next();
    }

    const headerToken = getToken(req);
    if (pathLower.startsWith('/open/')) {
      const apps = await shareStore.getApps();
      const doc = apps?.filter((x) =>
        x.tokens?.find((y) => y.value === headerToken),
      )?.[0];
      if (doc && doc.tokens && doc.tokens.length > 0) {
        const currentToken = doc.tokens.find((x) => x.value === headerToken);
        const keyMatch = pathLower.match(/\/open\/([a-z]+)\/*/);
        const key = keyMatch && keyMatch[1];

        if (!doc.scopes.includes(key as AppScope)) {
          const err = new UnauthorizedError('credentials_bad_scheme', {
            message: t('暂无权限'),
          });
          return next(err);
        }

        if (
          !currentToken ||
          currentToken.expiration < Math.round(Date.now() / 1000)
        ) {
          const err = new UnauthorizedError('invalid_token', {
            message: t('Token 已失效'),
          });
          return next(err);
        }

        return next();
      }
    }

    const originPath = `${req.baseUrl}${pathLower === '/' ? '' : pathLower}`;
    if (
      !headerToken &&
      originPath &&
      config.apiWhiteList.includes(originPath)
    ) {
      return next();
    }

    const authInfo = await shareStore.getAuthInfo();
    if (isValidToken(authInfo, headerToken, req.platform, config.jwt.secret)) {
      return next();
    }

    const errorCode = headerToken ? 'invalid_token' : 'credentials_required';
    const errorMessage = headerToken ? t('Token 已失效') : t('请先登录');
    const err = new UnauthorizedError(errorCode, { message: errorMessage });
    next(err);
  });

  app.use(async (req, res, next) => {
    const pathLower = req.path.toLowerCase();
    if (
      ![
        '/api/user/init',
        '/api/user/notification/init',
        '/open/user/init',
        '/open/user/notification/init',
      ].includes(pathLower)
    ) {
      return next();
    }
    const authInfo = (await shareStore.getAuthInfo()) || ({} as AuthInfo);

    let isInitialized = !isDefaultAuthInfo(authInfo);

    if (isInitialized) {
      return res.send({ code: 450, message: t('未知错误') });
    } else {
      return next();
    }
  });

  app.use(rewrite('/open/*', '/api/$1'));
  app.use(config.api.prefix, routes());

  app.get('*', (req, res, next) => {
    // Don't serve index.html for API routes
    if (
      req.path === config.api.prefix ||
      req.path.startsWith(`${config.api.prefix}/`)
    ) {
      return res.status(404).json({ code: 404, message: 'Not Found' });
    }
    const indexPath = path.join(frontendPath, 'index.html');
    res.sendFile(indexPath, (err) => {
      if (err) {
        const err: any = new Error('Not Found');
        err['status'] = 404;
        next(err);
      }
    });
  });

  app.use(validationErrors);
  app.use(uniqueConstraintError);

  app.use(
    (
      err: Error & { status: number },
      req: Request,
      res: Response,
      next: NextFunction,
    ) => {
      if (err.name === 'UnauthorizedError') {
        return res
          .status(err.status)
          .send({ code: 401, message: err.message })
          .end();
      }
      return next(err);
    },
  );

  app.use(
    (
      err: Error & { errors: any[] },
      req: Request,
      res: Response,
      next: NextFunction,
    ) => {
      if (err.name.includes('Sequelize')) {
        return res
          .status(500)
          .send({
            code: 400,
            message: `${err.message}`,
            errors: err.errors,
          })
          .end();
      }
      return next(err);
    },
  );

  app.use(
    (
      err: Error & { status: number },
      req: Request,
      res: Response,
      next: NextFunction,
    ) => {
      res.status(err.status || 500);
      res.json({
        code: err.status || 500,
        message: err.message,
      });
    },
  );
};