Merge pull request #3959 from overleaf/jpa-take-note-of-past-url

[UnsupportedBrowserMiddleware] take note of the past URL in redirect

GitOrigin-RevId: d80ed876f87e54c181f00669a11795a2ce44e5a5

services/web/app/src/infrastructure/UnsupportedBrowserMiddleware.js

@@ -1,5 +1,7 @@
 const Bowser = require('bowser')
 const Settings = require('settings-sharelatex')
+const Url = require('url')
+const { getSafeRedirectPath } = require('../Features/Helpers/UrlHelper')
 
 function unsupportedBrowserMiddleware(req, res, next) {
   if (!Settings.unsupportedBrowsers) return next()
@@ -16,10 +18,28 @@ function unsupportedBrowserMiddleware(req, res, next) {
 
   const isUnsupported = parser.satisfies(Settings.unsupportedBrowsers)
   if (isUnsupported) {
-    return res.redirect('/unsupported-browser')
+    return res.redirect(
+      Url.format({
+        pathname: '/unsupported-browser',
+        query: { fromURL: req.originalUrl },
+      })
+    )
   }
 
   next()
 }
 
-module.exports = { unsupportedBrowserMiddleware }
+function renderUnsupportedBrowserPage(req, res) {
+  let fromURL
+  if (typeof req.query.fromURL === 'string') {
+    try {
+      fromURL = Settings.siteUrl + getSafeRedirectPath(req.query.fromURL)
+    } catch (e) {}
+  }
+  res.render('general/unsupported-browser', { fromURL })
+}
+
+module.exports = {
+  renderUnsupportedBrowserPage,
+  unsupportedBrowserMiddleware,
+}

services/web/app/src/router.js

@@ -50,6 +50,7 @@ const UserMembershipRouter = require('./Features/UserMembership/UserMembershipRo
 const SystemMessageController = require('./Features/SystemMessages/SystemMessageController')
 const { Joi, validate } = require('./infrastructure/Validation')
 const {
+  renderUnsupportedBrowserPage,
   unsupportedBrowserMiddleware,
 } = require('./infrastructure/UnsupportedBrowserMiddleware')
 
@@ -1143,9 +1144,7 @@ function initialize(webRouter, privateApiRouter, publicApiRouter) {
     TokenAccessController.grantTokenAccessReadOnly
   )
 
-  webRouter.get('/unsupported-browser', (req, res) => {
-    res.render('general/unsupported-browser')
-  })
+  webRouter.get('/unsupported-browser', renderUnsupportedBrowserPage)
 
   webRouter.get('*', ErrorController.notFound)
 }

services/web/app/views/general/unsupported-browser.pug

@@ -14,3 +14,9 @@ block body
 							| Sorry, we don't support your browser anymore. Find out more about #[a(href="https://www.overleaf.com/learn/how-to/What_browsers_do_you_support") what browsers we support].
 							br
 							| If you think you're seeing this message in error, please #[a(href="/contact") let us know].
+
+						if fromURL
+							p
+								| URL:
+								|
+								a(href=fromURL) #{fromURL}

services/web/test/acceptance/src/UnsupportedBrowserTests.js

@@ -44,9 +44,10 @@ describe('UnsupportedBrowsers', function () {
   })
 
   it('redirects unsupported browsers to unsupported page', function (done) {
+    const url = '/project'
     this.user.request(
       {
-        url: '/project',
+        url,
         headers: {
           // IE11 user agent
           'user-agent':
@@ -56,7 +57,52 @@ describe('UnsupportedBrowsers', function () {
       (error, response) => {
         expect(error).to.not.exist
         expect(response.statusCode).to.equal(302)
-        expect(response.headers.location).to.equal('/unsupported-browser')
+        expect(response.headers.location).to.equal(
+          '/unsupported-browser?fromURL=' + encodeURIComponent(url)
+        )
+        done()
+      }
+    )
+  })
+
+  it('shows the previous URL', function (done) {
+    const url = '/project/60867f47174dfd13f1e00000'
+    this.user.request(
+      {
+        url: '/unsupported-browser?fromURL=' + encodeURIComponent(url),
+        headers: {
+          // IE11 user agent
+          'user-agent':
+            'Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko',
+        },
+      },
+      (error, response, body) => {
+        expect(error).to.not.exist
+        expect(response.statusCode).to.equal(200)
+        expect(body).to.include('URL:')
+        expect(body).to.include(url)
+        done()
+      }
+    )
+  })
+
+  it('shows a sanitized URL', function (done) {
+    const url = 'https://evil.com/the/pathname'
+    this.user.request(
+      {
+        url: '/unsupported-browser?fromURL=' + encodeURIComponent(url),
+        headers: {
+          // IE11 user agent
+          'user-agent':
+            'Mozilla/5.0 (Windows NT 10.0; Trident/7.0; rv:11.0) like Gecko',
+        },
+      },
+      (error, response, body) => {
+        expect(error).to.not.exist
+        expect(response.statusCode).to.equal(200)
+        expect(body).to.include('URL:')
+        expect(body).to.not.include('evil.com')
+        expect(body).to.include('/the/pathname')
         done()
       }
     )