feat: fallback metadata injection (#7070)

* feat: fallback metadata

* fix lint

* Update tsconfig.json

* feedback

* fix: cloudfunctions

* update test

functions/[[index]].ts

+/* eslint-disable import/no-unused-modules */
+import { MetaTagInjector } from './components/metaTagInjector'
+
+export const onRequest: PagesFunction = async ({ request, next }) => {
+  const imageUri = new URL(request.url).origin + '/images/1200x630_Rich_Link_Preview_Image.png'
+  const data = {
+    title: 'Uniswap Interface',
+    image: imageUri,
+    url: request.url,
+  }
+  const res = next()
+  try {
+    return new HTMLRewriter().on('head', new MetaTagInjector(data)).transform(await res)
+  } catch (e) {
+    return res
+  }
+}

functions/default.test.ts

+const defaultUrls = ['http://127.0.0.1:3000/', 'http://127.0.0.1:3000/swap', 'http://127.0.0.1:3000/pools']
+
+test.each(defaultUrls)('should inject metadata for valid collections', async (defaultUrl) => {
+  const body = await fetch(new Request(defaultUrl)).then((res) => res.text())
+  expect(body).toMatchSnapshot()
+  expect(body).toContain(`<meta property="og:title" content="Uniswap Interface"/>`)
+  expect(body).toContain(
+    `<meta property="og:image" content="http://127.0.0.1:3000/images/1200x630_Rich_Link_Preview_Image.png"/>`
+  )
+  expect(body).toContain(`<meta property="og:image:width" content="1200"/>`)
+  expect(body).toContain(`<meta property="og:image:height" content="630"/>`)
+  expect(body).toContain(`<meta property="og:type" content="website"/>`)
+  expect(body).toContain(`<meta property="og:url" content="${defaultUrl}"/>`)
+  expect(body).toContain(`<meta property="og:image:alt" content="Uniswap Interface"/>`)
+  expect(body).toContain(`<meta property="twitter:card" content="summary_large_image"/>`)
+  expect(body).toContain(`<meta property="twitter:title" content="Uniswap Interface"/>`)
+  expect(body).toContain(
+    `<meta property="twitter:image" content="http://127.0.0.1:3000/images/1200x630_Rich_Link_Preview_Image.png"/>`
+  )
+  expect(body).toContain(`<meta property="twitter:image:alt" content="Uniswap Interface"/>`)
+})

functions/nfts/collection/collection.test.ts

@@ -38,9 +38,7 @@ test.each(collections)('should inject metadata for valid collections', async (co
 
 const invalidCollections = [
   'http://127.0.0.1:3000/nfts/collection/0xed5af388653567af2f388e6224dc7c4b3241c545',
-  'http://127.0.0.1:3000/nfts/collection/0xed5af388653567af2f388e6224dc7c4b3241c545/10',
   'http://127.0.0.1:3000/nfts/collection/0xed5af388653567af2f388e6224dc7c4b3241c545//',
-  'http://127.0.0.1:3000/nfts/collection',
 ]
 
 test.each(invalidCollections)(