Make sure to handle paths with dot in name for SPR (#9227)

packages/next/export/worker.js

@@ -93,7 +93,7 @@ export default async function ({
     }
 
     const baseDir = join(outDir, dirname(htmlFilename))
-    const htmlFilepath = join(outDir, htmlFilename)
+    let htmlFilepath = join(outDir, htmlFilename)
 
     await mkdirp(baseDir)
     let html
@@ -117,6 +117,12 @@ export default async function ({
       // prerendered the file
       if (renderedDuringBuild(mod.unstable_getStaticProps)) return results
 
+      if (mod.unstable_getStaticProps && !htmlFilepath.endsWith('.html')) {
+        // make sure it ends with .html if the name contains a dot
+        htmlFilename += '.html'
+        htmlFilepath += '.html'
+      }
+
       renderMethod = mod.renderReqToHTML
       const result = await renderMethod(req, res, true)
       curRenderOpts = result.renderOpts || {}
@@ -139,6 +145,16 @@ export default async function ({
         return results
       }
 
+      // TODO: de-dupe the logic here between serverless and server mode
+      if (
+        components.unstable_getStaticProps &&
+        !htmlFilepath.endsWith('.html')
+      ) {
+        // make sure it ends with .html if the name contains a dot
+        htmlFilepath += '.html'
+        htmlFilename += '.html'
+      }
+
       if (typeof components.Component === 'string') {
         html = components.Component
       } else {

test/integration/prerender/pages/blog/[post]/index.js

@@ -3,7 +3,12 @@ import Link from 'next/link'
 
 // eslint-disable-next-line camelcase
 export async function unstable_getStaticParams () {
-  return ['/blog/post-1', { post: 'post-2' }, '/blog/[post3]']
+  return [
+    '/blog/post-1',
+    { post: 'post-2' },
+    '/blog/[post3]',
+    '/blog/post.1'
+  ]
 }
 
 // eslint-disable-next-line camelcase

test/integration/prerender/test/index.test.js

@@ -75,6 +75,11 @@ const expectedManifestRoutes = () => ({
     initialRevalidateSeconds: 2,
     srcRoute: '/blog/[post]/[comment]'
   },
+  '/blog/post.1': {
+    dataRoute: `/_next/data/${buildId}/blog/post.1.json`,
+    initialRevalidateSeconds: 10,
+    srcRoute: '/blog/[post]'
+  },
   '/another': {
     dataRoute: `/_next/data/${buildId}/another.json`,
     initialRevalidateSeconds: 0,