gatsby/dist/utils/express-middlewares.js

Blazing fast modern site generator for React

"use strict";

exports.__esModule = true;
exports.configureTrailingSlash = void 0;
var _findPageByPath = require("./find-page-by-path");
const configureTrailingSlash = (getState, option) => (req, res, next) => {
  var _req$path$split, _req$path$split$pop;
  const method = req.method.toLocaleLowerCase();
  if (![`get`, `head`].includes(method)) {
    next();
    return;
  }
  if (req !== null && req !== void 0 && (_req$path$split = req.path.split(`/`)) !== null && _req$path$split !== void 0 && (_req$path$split$pop = _req$path$split.pop()) !== null && _req$path$split$pop !== void 0 && _req$path$split$pop.includes(`.`)) {
    // Path has an extension. Do not add slash.
    next();
    return;
  }
  if (req.path.length <= 1) {
    next();
    return;
  }

  // check if it's Gatsby Page
  const page = (0, _findPageByPath.findPageByPath)(getState(), req.path);
  if (page) {
    if (option === `never`) {
      if (req.path.slice(-1) === `/` && page.path !== req.path) {
        // Remove trailing slash
        const query = req.url.slice(req.path.length);
        res.redirect(301, req.path.slice(0, -1) + query);
        return;
      } else {
        // express.static really doesn't like paths without trailing slashes
        // so we "rewrite" request to look like request with trailing slash
        // otherwise we'll have an infinite redirect loop. We did this because
        // express.static automatically adds the redirect trailing slash then
        const BASE = `http://localhost`;
        const urlToMessWith = new URL(req.url, BASE);
        urlToMessWith.pathname += `/`;

        // The incoming req.url is relative, so we remove the base again
        // we use new URL so that queries/hashes are handled automatically
        req.url = urlToMessWith.toString().replace(BASE, ``);
      }
    } else if (option === `always`) {
      if (req.path.slice(-1) !== `/` && page.path !== req.path) {
        // Add trailing slash
        const query = req.url.slice(req.path.length);
        res.redirect(301, `${req.path}/${query}`);
        return;
      }
    }
  }
  next();
};
exports.configureTrailingSlash = configureTrailingSlash;
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