77022b8a56
* fix: redirect correctly in development * fix: prevent // appearing in path * refactor: remove old comments * fix: remove trailing slash for redirection
84 lines
2.9 KiB
JavaScript
84 lines
2.9 KiB
JavaScript
const jwt = require('jsonwebtoken');
|
|
const { availableLangs } = require('../../../client/i18n/allLangs');
|
|
const { allowedOrigins } = require('../../../config/cors-settings');
|
|
// homeLocation is being used as a fallback here. If the one provided by the
|
|
// client is invalid we default to this.
|
|
const { homeLocation } = require('../../../config/env.json');
|
|
|
|
function getReturnTo(encryptedParams, secret, _homeLocation = homeLocation) {
|
|
let params;
|
|
try {
|
|
params = jwt.verify(encryptedParams, secret);
|
|
} catch (e) {
|
|
// TODO: report to Sentry? Probably not. Remove entirely?
|
|
console.log(e);
|
|
// something went wrong, use default params
|
|
params = {
|
|
returnTo: `${_homeLocation}/learn`,
|
|
origin: _homeLocation,
|
|
pathPrefix: ''
|
|
};
|
|
}
|
|
|
|
return normalizeParams(params, _homeLocation);
|
|
}
|
|
|
|
function normalizeParams(
|
|
{ returnTo, origin, pathPrefix },
|
|
_homeLocation = homeLocation
|
|
) {
|
|
// coerce to strings, just in case something weird and nefarious is happening
|
|
returnTo = '' + returnTo;
|
|
origin = '' + origin;
|
|
pathPrefix = '' + pathPrefix;
|
|
// we add the '/' to prevent returns to
|
|
// www.freecodecamp.org.somewhere.else.com
|
|
if (
|
|
!returnTo ||
|
|
!allowedOrigins.some(allowed => returnTo.startsWith(allowed + '/'))
|
|
) {
|
|
returnTo = `${_homeLocation}/learn`;
|
|
origin = _homeLocation;
|
|
pathPrefix = '';
|
|
}
|
|
if (!origin || !allowedOrigins.includes(origin)) {
|
|
returnTo = `${_homeLocation}/learn`;
|
|
origin = _homeLocation;
|
|
pathPrefix = '';
|
|
}
|
|
pathPrefix = availableLangs.client.includes(pathPrefix) ? pathPrefix : '';
|
|
return { returnTo, origin, pathPrefix };
|
|
}
|
|
|
|
// TODO: tests!
|
|
// TODO: ensure origin and pathPrefix validation happens first
|
|
// (it needs a dedicated function that can be called from here and getReturnTo)
|
|
function getRedirectBase(origin, pathPrefix) {
|
|
const redirectPathSegment = pathPrefix ? `/${pathPrefix}` : '';
|
|
return `${origin}${redirectPathSegment}`;
|
|
}
|
|
|
|
function getRedirectParams(req, _normalizeParams = normalizeParams) {
|
|
const url = req.header('Referer');
|
|
// since we do not always redirect the user back to the page they were on
|
|
// we need client locale and origin to construct the redirect url.
|
|
const returnUrl = new URL(url ? url : homeLocation);
|
|
const origin = returnUrl.origin;
|
|
// if this is not one of the client languages, validation will convert
|
|
// this to '' before it is used.
|
|
const pathPrefix = returnUrl.pathname.split('/')[0];
|
|
return _normalizeParams({ returnTo: returnUrl.href, origin, pathPrefix });
|
|
}
|
|
|
|
function isRootPath(redirectBase, returnUrl) {
|
|
const base = new URL(redirectBase);
|
|
const url = new URL(returnUrl);
|
|
return base.pathname === url.pathname;
|
|
}
|
|
|
|
module.exports.getReturnTo = getReturnTo;
|
|
module.exports.getRedirectBase = getRedirectBase;
|
|
module.exports.normalizeParams = normalizeParams;
|
|
module.exports.getRedirectParams = getRedirectParams;
|
|
module.exports.isRootPath = isRootPath;
|