fix(next): does not format top-level domains within admin.preview or livePreview.url functions (#9831)

Fixes #9830. Continuation of #9755 and #9746. Instead of automatically
appending TLDs to the `admin.preview` and the `livePreview.url` URLs, we
should instead ensure that `req` is passed through these functions, so
that you can have full control over the format of this URL without
Payload imposing any of its own formatting.

docs/admin/collections.mdx

@@ -108,14 +108,20 @@ export const Posts: CollectionConfig = {
 }
 ```
 
-The `preview` property resolves to a string that points to your front-end application with additional URL parameters. This can be an absolute URL or a relative path. If you are using a relative path, Payload will prepend the application's origin onto it, creating a fully qualified URL.
+The `preview` property resolves to a string that points to your front-end application with additional URL parameters. This can be an absolute URL or a relative path.
 
 The preview function receives two arguments:
 
 | Argument | Description |
 | --- | --- |
 | **`doc`** | The Document being edited. |
-| **`ctx`** | An object containing `locale` and `token` properties. The `token` is the currently logged-in user's JWT. |
+| **`ctx`** | An object containing `locale`, `token`, and `req` properties. The `token` is the currently logged-in user's JWT. |
+
+If your application requires a fully qualified URL, such as within deploying to Vercel Preview Deployments, you can use the `req` property to build this URL:
+
+```ts
+preview: (doc, { req }) => `${req.protocol}//${req.host}/${doc.slug}` // highlight-line
+```
 
 <Banner type="success">
   <strong>Note:</strong>

docs/live-preview/overview.mdx

@@ -54,8 +54,6 @@ _\* An asterisk denotes that a property is required._
 
 The `url` property resolves to a string that points to your front-end application. This value is used as the `src` attribute of the iframe rendering your front-end. Once loaded, the Admin Panel will communicate directly with your app through `window.postMessage` events.
 
-This can be an absolute URL or a relative path. If you are using a relative path, Payload will prepend the application's origin onto it, creating a fully qualified URL. This is useful for Vercel preview deployments, for example, where URLs are not known ahead of time.
-
 To set the URL, use the `admin.livePreview.url` property in your [Payload Config](../configuration/overview):
 
 ```ts
@@ -107,8 +105,16 @@ The following arguments are provided to the `url` function:
 | Path               | Description                                                                                                       |
 | ------------------ | ----------------------------------------------------------------------------------------------------------------- |
 | **`data`**         | The data of the Document being edited. This includes changes that have not yet been saved.                        |
-| **`documentInfo`** | Information about the Document being edited like collection slug. [More details](../admin/hooks#usedocumentinfo). |
 | **`locale`**       | The locale currently being edited (if applicable). [More details](../configuration/localization).                 |
+| **`collectionConfig`** | The Collection Admin Config of the Document being edited. [More details](../admin/collections).                 |
+| **`globalConfig`** | The Global Admin Config of the Document being edited. [More details](../admin/globals).                          |
+| **`req`**          | The Payload Request object.  |
+
+If your application requires a fully qualified URL, such as within deploying to Vercel Preview Deployments, you can use the `req` property to build this URL:
+
+```ts
+url: (doc, { req }) => `${req.protocol}//${req.host}/${doc.slug}` // highlight-line
+```
 
 ### Breakpoints
 

packages/next/src/routes/rest/collections/preview.ts

@@ -11,7 +11,7 @@ export const preview: CollectionRouteHandlerWithID = async ({ id, collection, re
   const { searchParams } = req
   const depth = searchParams.get('depth')
 
-  const result = await findByIDOperation({
+  const doc = await findByIDOperation({
     id,
     collection,
     depth: isNumber(depth) ? Number(depth) : undefined,
@@ -29,16 +29,11 @@ export const preview: CollectionRouteHandlerWithID = async ({ id, collection, re
 
   if (typeof generatePreviewURL === 'function') {
     try {
-      previewURL = await generatePreviewURL(result, {
+      previewURL = await generatePreviewURL(doc, {
         locale: req.locale,
         req,
         token,
       })
-
-      // Support relative URLs by prepending the origin, if necessary
-      if (previewURL && previewURL.startsWith('/')) {
-        previewURL = `${req.protocol}//${req.host}${previewURL}`
-      }
     } catch (err) {
       return routeError({
         collection,

packages/next/src/routes/rest/globals/preview.ts

@@ -11,7 +11,7 @@ export const preview: GlobalRouteHandler = async ({ globalConfig, req }) => {
   const { searchParams } = req
   const depth = searchParams.get('depth')
 
-  const result = await findOneOperation({
+  const doc = await findOneOperation({
     slug: globalConfig.slug,
     depth: isNumber(depth) ? Number(depth) : undefined,
     draft: searchParams.get('draft') === 'true',
@@ -29,7 +29,7 @@ export const preview: GlobalRouteHandler = async ({ globalConfig, req }) => {
 
   if (typeof generatePreviewURL === 'function') {
     try {
-      previewURL = await generatePreviewURL(result, {
+      previewURL = await generatePreviewURL(doc, {
         locale: req.locale,
         req,
         token,

packages/next/src/views/LivePreview/index.tsx

@@ -36,21 +36,21 @@ export const LivePreviewView: PayloadServerReactComponent<EditViewComponent> = a
     },
   ]
 
-  let url =
+  const url =
     typeof livePreviewConfig?.url === 'function'
       ? await livePreviewConfig.url({
           collectionConfig,
           data: doc,
           globalConfig,
           locale,
+          req,
+          /**
+           * @deprecated
+           * Use `req.payload` instead. This will be removed in the next major version.
+           */
           payload: initPageResult.req.payload,
         })
       : livePreviewConfig?.url
 
-  // Support relative URLs by prepending the origin, if necessary
-  if (url && url.startsWith('/')) {
-    url = `${initPageResult.req.protocol}//${initPageResult.req.host}${url}`
-  }
-
   return <LivePreviewClient breakpoints={breakpoints} initialData={doc} url={url} />
 }

packages/payload/src/config/types.ts

@@ -148,7 +148,12 @@ export type LivePreviewConfig = {
         data: Record<string, any>
         globalConfig?: SanitizedGlobalConfig
         locale: Locale
+        /**
+         * @deprecated
+         * Use `req.payload` instead. This will be removed in the next major version.
+         */
         payload: Payload
+        req: PayloadRequest
       }) => Promise<string> | string)
     | string
 }

templates/website/src/collections/Pages/index.ts

@@ -48,14 +48,12 @@ export const Pages: CollectionConfig<'pages'> = {
         return path
       },
     },
-    preview: (data) => {
+    preview: (data, { req }) =>
-      const path = generatePreviewPath({
+      generatePreviewPath({
         slug: typeof data?.slug === 'string' ? data.slug : '',
         collection: 'pages',
-      })
+        req,
-
+      }),
-      return path
-    },
     useAsTitle: 'title',
   },
   fields: [

templates/website/src/collections/Posts/index.ts

@@ -54,19 +54,18 @@ export const Posts: CollectionConfig<'posts'> = {
         const path = generatePreviewPath({
           slug: typeof data?.slug === 'string' ? data.slug : '',
           collection: 'posts',
+          // req, TODO: thread `req` once 3.5.1 is out, see notes in `generatePreviewPath`
         })
 
         return path
       },
     },
-    preview: (data) => {
+    preview: (data, { req }) =>
-      const path = generatePreviewPath({
+      generatePreviewPath({
         slug: typeof data?.slug === 'string' ? data.slug : '',
         collection: 'posts',
-      })
+        req,
-
+      }),
-      return path
-    },
     useAsTitle: 'title',
   },
   fields: [

templates/website/src/utilities/generatePreviewPath.ts

@@ -1,4 +1,4 @@
-import { CollectionSlug } from 'payload'
+import { PayloadRequest, CollectionSlug } from 'payload'
 
 const collectionPrefixMap: Partial<Record<CollectionSlug, string>> = {
   posts: '/posts',
@@ -8,9 +8,10 @@ const collectionPrefixMap: Partial<Record<CollectionSlug, string>> = {
 type Props = {
   collection: keyof typeof collectionPrefixMap
   slug: string
+  req?: PayloadRequest // TODO: make this required once 3.5.1 is out, it's a new argument in that version
 }
 
-export const generatePreviewPath = ({ collection, slug }: Props) => {
+export const generatePreviewPath = ({ collection, slug, req }: Props) => {
   const path = `${collectionPrefixMap[collection]}/${slug}`
 
   const params = {
@@ -25,5 +26,12 @@ export const generatePreviewPath = ({ collection, slug }: Props) => {
     encodedParams.append(key, value)
   })
 
-  return `/next/preview?${encodedParams.toString()}`
+  let url = `/next/preview?${encodedParams.toString()}`
+
+  // TODO: remove this check once 3.5.1 is out, see note above
+  if (req) {
+    url = `${req.protocol}//${req.host}${url}`
+  }
+
+  return url
 }

test/live-preview/app/live-preview/(pages)/[slug]/page.client.tsx

@@ -5,7 +5,7 @@ import React from 'react'
 
 import type { Page as PageType } from '../../../../payload-types.js'
 
-import { renderedPageTitleID } from '../../../../shared.js'
+import { localizedPageTitleID, renderedPageTitleID } from '../../../../shared.js'
 import { PAYLOAD_SERVER_URL } from '../../_api/serverURL.js'
 import { Blocks } from '../../_components/Blocks/index.js'
 import { Gutter } from '../../_components/Gutter/index.js'
@@ -38,7 +38,7 @@ export const PageClient: React.FC<{
       />
       <Gutter>
         <div id={renderedPageTitleID}>{`For Testing: ${data.title}`}</div>
-        <div id={renderedPageTitleID}>
+        <div id={localizedPageTitleID}>
           {`For Testing (Localized): ${typeof data.relationToLocalized === 'string' ? data.relationToLocalized : data.relationToLocalized?.localizedTitle}`}
         </div>
       </Gutter>

test/live-preview/app/live-preview/(pages)/ssr-autosave/[slug]/page.tsx

@@ -46,7 +46,7 @@ export async function generateStaticParams() {
   try {
     const ssrPages = await getDocs<Page>(ssrAutosavePagesSlug)
     return ssrPages?.map(({ slug }) => slug)
-  } catch (error) {
+  } catch (_err) {
     return []
   }
 }

test/live-preview/app/live-preview/(pages)/ssr/[slug]/page.tsx

@@ -46,7 +46,7 @@ export async function generateStaticParams() {
   try {
     const ssrPages = await getDocs<Page>(ssrPagesSlug)
     return ssrPages?.map(({ slug }) => slug)
-  } catch (error) {
+  } catch (_err) {
     return []
   }
 }

test/live-preview/prod/app/live-preview/(pages)/ssr-autosave/[slug]/page.tsx

@@ -46,7 +46,7 @@ export async function generateStaticParams() {
   try {
     const ssrPages = await getDocs<Page>(ssrAutosavePagesSlug)
     return ssrPages?.map(({ slug }) => slug)
-  } catch (error) {
+  } catch (_err) {
     return []
   }
 }

test/live-preview/prod/app/live-preview/(pages)/ssr/[slug]/page.tsx

@@ -46,7 +46,7 @@ export async function generateStaticParams() {
   try {
     const ssrPages = await getDocs<Page>(ssrPagesSlug)
     return ssrPages?.map(({ slug }) => slug)
-  } catch (error) {
+  } catch (_err) {
     return []
   }
 }

test/live-preview/shared.ts

@@ -22,3 +22,5 @@ export const desktopBreakpoint = {
 }
 
 export const renderedPageTitleID = 'rendered-page-title'
+
+export const localizedPageTitleID = 'localized-page-title'

test/live-preview/utilities/formatLivePreviewURL.ts

@@ -3,15 +3,15 @@ import type { LivePreviewConfig } from 'payload'
 export const formatLivePreviewURL: LivePreviewConfig['url'] = async ({
   data,
   collectionConfig,
-  payload,
+  req,
 }) => {
-  let baseURL = '/live-preview'
+  let baseURL = `${req.protocol}//${req.host}/live-preview`
 
   // You can run async requests here, if needed
   // For example, multi-tenant apps may need to lookup additional data
   if (data.tenant) {
     try {
-      const fullTenant = await payload
+      const fullTenant = await req.payload
         .find({
           collection: 'tenants',
           where: {