Merge pull request #10788 from wellcomecollection/revert-10740-revert…

…-10739-revert-10721-next-preview

Revert "Trial Prismic's next preview tool, part II"

common/koa-middleware/withCachedValues.ts

@@ -1,8 +1,12 @@
+import compose from 'koa-compose';
+import { withPrismicPreviewStatus } from './withPrismicPreviewStatus';
 import { IncomingMessage, ServerResponse } from 'http';
 import Router from 'koa-router';
 import { NextServer } from 'next/dist/server/next';
 import { parse, UrlWithParsedQuery } from 'url'; // eslint-disable-line n/no-deprecated-api
 
+export const withCachedValues = compose([withPrismicPreviewStatus]);
+
 export async function route(
   path: string,
   page: string,

common/koa-middleware/withPrismicPreviewStatus.ts

@@ -0,0 +1,27 @@
+import Koa from 'koa';
+
+export function withPrismicPreviewStatus(
+  ctx: Koa.DefaultContext,
+  next: Koa.Next
+  /* eslint-disable @typescript-eslint/no-explicit-any */
+): Promise<any> {
+  /* eslint-enable @typescript-eslint/no-explicit-any */
+
+  // for previews on localhost we use /preview to determine whether the 'isPreview' cookie should be set
+  // this kinda works for live too, but not for shared preview links, as they never hit /preview
+  // we therefore look for the subdomain .preview to determine if it's a preview
+  const previewCookieName = 'isPreview';
+  const isPreviewDomain = Boolean(ctx.request.host.startsWith('preview.'));
+  const previewCookieMatch = ctx.headers.cookie
+    ? ctx.headers.cookie.match(`(^|;) ?${previewCookieName}=([^;]*)(;|$)`)
+    : undefined;
+
+  const previewCookie = previewCookieMatch ? previewCookieMatch[2] : undefined;
+
+  if (isPreviewDomain && !previewCookie) {
+    ctx.cookies.set('isPreview', 'true', {
+      httpOnly: false,
+    });
+  }
+  return next();
+}

common/views/components/CivicUK/index.tsx

@@ -65,7 +65,7 @@ const necessaryCookies = () => {
   const wcCookies = Object.values(cookies).map(c => c);
 
   // Allows Prismic previews
-  const prismicPreview = ['io.prismic.preview'];
+  const prismicPreview = ['io.prismic.preview', 'isPreview'];
 
   // See @weco/toggles/webapp/toggles for details on each
   const featureFlags = ['toggle_*'];

common/views/pages/_app.tsx

@@ -2,7 +2,6 @@ import { NextPage } from 'next';
 import { AppProps } from 'next/app';
 import React, { useEffect, FunctionComponent, ReactElement } from 'react';
 import { ThemeProvider } from 'styled-components';
-import { PrismicPreview } from '@prismicio/next';
 import theme, { GlobalStyle } from '@weco/common/views/themes/default';
 import LoadingIndicator from '@weco/common/views/components/LoadingIndicator/LoadingIndicator';
 import { AppContextProvider } from '@weco/common/views/components/AppContext/AppContext';
@@ -21,6 +20,7 @@ import { ServerDataContext } from '@weco/common/server-data/Context';
 import UserProvider from '@weco/common/views/components/UserProvider/UserProvider';
 import { ApmContextProvider } from '@weco/common/views/components/ApmContext/ApmContext';
 import { AppErrorProps } from '@weco/common/services/app';
+import usePrismicPreview from '@weco/common/services/app/usePrismicPreview';
 import useMaintainPageHeight from '@weco/common/services/app/useMaintainPageHeight';
 import { GaDimensions } from '@weco/common/services/app/google-analytics';
 import { deserialiseProps } from '@weco/common/utils/json';
@@ -129,6 +129,8 @@ const WecoApp: FunctionComponent<WecoAppProps> = ({
   // or when requested client-side through next/link or next/router
   // i.e. everything that we consider to be a page view
 
+  usePrismicPreview(() => Boolean(document.cookie.match('isPreview=true')));
+
   const getLayout = Component.getLayout || (page => <>{page}</>);
 
   return (
@@ -158,8 +160,6 @@ const WecoApp: FunctionComponent<WecoAppProps> = ({
                       title={pageProps.err.message}
                     />
                   )}
-
-                  <PrismicPreview repositoryName="wellcomecollection" />
                 </ThemeProvider>
               </SearchContextProvider>
             </AppContextProvider>

content/webapp/app.ts

@@ -6,7 +6,10 @@ import Router from 'koa-router';
 import next from 'next';
 import { apmErrorMiddleware } from '@weco/common/services/apm/errorMiddleware';
 import { init as initServerData } from '@weco/common/server-data';
-import { handleAllRoute } from '@weco/common/koa-middleware/withCachedValues';
+import {
+  withCachedValues,
+  handleAllRoute,
+} from '@weco/common/koa-middleware/withCachedValues';
 import linkResolver from '@weco/common/services/prismic/link-resolver';
 import { createClient as createPrismicClient } from '@weco/common/services/prismic/fetch';
 import * as prismic from '@prismicio/client';
@@ -41,6 +44,7 @@ const appPromise = nextApp
     });
 
     koaApp.use(apmErrorMiddleware);
+    koaApp.use(withCachedValues);
 
     // Add a naive healthcheck endpoint for the load balancer
     router.get('/management/healthcheck', async ctx => {
@@ -68,6 +72,10 @@ const appPromise = nextApp
         defaultURL: '/',
       });
 
+      ctx.cookies.set('isPreview', 'true', {
+        httpOnly: false,
+      });
+
       ctx.redirect(url);
     });