Add OG image endpoint and default meta tags for social thumbnails

Makefile

@@ -0,0 +1,8 @@
+build:
+	@yarn build
+dev:
+	@yarn dev
+format:
+	@yarn format
+lint:
+	@yarn lint

src/lib/images/pl-logo-white-svg.ts

@@ -0,0 +1,3 @@
+// Exported as a string for use in the OG image edge endpoint, which can't
+// use fs or standard Next.js image imports.
+export const plLogoWhiteSvg = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 479.42 100.57"><polygon fill="#fff" stroke="#fff" stroke-miterlimit="10" points="292.64 34.59 279.55 34.59 279.55 84.83 313.78 84.83 314.16 75.45 292.64 75.45 292.64 34.59"/><path fill="#fff" stroke="#fff" stroke-miterlimit="10" d="M348.78,48.88c-2.79-1.94-6.34-2.92-10.57-2.92-3.93,0-7.39,.85-10.3,2.53-2.93,1.69-5.2,4.09-6.75,7.12-1.54,3.01-2.32,6.5-2.32,10.37,0,3.64,.76,6.98,2.25,9.92,1.51,2.97,3.88,5.37,7.05,7.13,3.13,1.75,7.09,2.63,11.76,2.63,2.56,0,4.95-.18,7.12-.53,2.17-.35,4.45-.96,6.78-1.8l.6-.21,.63-9.97-1.39,.58c-2.13,.89-4.05,1.52-5.73,1.88-1.66,.35-3.62,.53-5.84,.53-3.15,0-5.72-.74-7.65-2.19-1.62-1.22-2.58-2.85-2.92-4.97h25.46v-1c0-4.16-.66-7.92-1.97-11.18-1.33-3.32-3.42-5.98-6.2-7.92Zm-17.3,11.48c.37-1.8,1.03-3.19,1.98-4.12,1.14-1.12,2.58-1.66,4.4-1.66,2.05,0,3.62,.57,4.78,1.75,.97,.99,1.52,2.31,1.66,4.03h-12.82Z"/><path fill="#fff" stroke="#fff" stroke-miterlimit="10" 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fill="#fff" stroke="#fff" stroke-miterlimit="10" d="M30.62,5.14c.1-.09,2.56-2.12,6.56,.28,.08,.05,.17,.07,.26,.07,.17,0,.34-.09,.43-.24,.14-.24,.06-.54-.17-.69-4.64-2.78-7.6-.28-7.73-.17-.21,.18-.23,.49-.05,.7,.18,.21,.5,.23,.7,.05Z"/></svg>`;

src/pages/_document.tsx

@@ -23,6 +23,18 @@ class MyDocument extends Document {
             integrity="sha384-AfEj0r4/OFrOo5t7NnNe46zW/tFgW6x/bCJG8FqQCEo3+Aro6EYUG4+cU+KJWu/X"
             crossOrigin="anonymous"
           />
+          <meta
+            name="description"
+            content="PrairieLearn is an online assessment and learning system that empowers instructors to create robust educational resources for students."
+          />
+          <meta property="og:type" content="website" />
+          <meta property="og:site_name" content="PrairieLearn" />
+          <meta property="og:image" content="/api/og" />
+          <meta
+            property="og:description"
+            content="PrairieLearn is an online assessment and learning system that empowers instructors to create robust educational resources for students."
+          />
+          <meta name="twitter:card" content="summary_large_image" />
         </Head>
         <body>
           <Main />

src/pages/api/og.tsx

@@ -0,0 +1,51 @@
+import { ImageResponse } from "next/og";
+import type { NextRequest } from "next/server";
+import { plLogoWhiteSvg } from "../../lib/images/pl-logo-white-svg";
+
+export const config = {
+  runtime: "edge",
+};
+
+export default function handler(req: NextRequest) {
+  const { searchParams } = new URL(req.url);
+  const title = searchParams.get("title");
+
+  return new ImageResponse(
+    <div
+      style={{
+        display: "flex",
+        flexDirection: "column",
+        alignItems: "center",
+        justifyContent: "center",
+        width: "100%",
+        height: "100%",
+        backgroundColor: "#084298",
+        padding: "60px",
+      }}
+    >
+      {/* eslint-disable-next-line @next/next/no-img-element, jsx-a11y/alt-text */}
+      <img
+        src={`data:image/svg+xml,${encodeURIComponent(plLogoWhiteSvg)}`}
+        width={500}
+        height={105}
+      />
+      <div
+        style={{
+          color: "white",
+          fontSize: 48,
+          textAlign: "center",
+          marginTop: 40,
+          maxWidth: 900,
+          lineHeight: 1.3,
+          whiteSpace: "pre-wrap",
+        }}
+      >
+        {title || "The most comprehensive\nassessment platform"}
+      </div>
+    </div>,
+    {
+      width: 1200,
+      height: 630,
+    },
+  );
+}

src/pages/index.tsx

@@ -89,6 +89,11 @@ const Home: React.FC<HomeProps> = ({ seed }) => {
     <React.Fragment>
       <Head>
         <title>PrairieLearn</title>
+        <meta property="og:title" content="PrairieLearn" />
+        <meta
+          property="og:description"
+          content="The most comprehensive assessment platform"
+        />
       </Head>
 
       <div className={classnames("container-fluid py-4", styles.banner)}>
@@ -101,7 +106,7 @@ const Home: React.FC<HomeProps> = ({ seed }) => {
                   styles["text-wrap-balance"],
                 )}
               >
-                Empowering learners with equitable and authentic assessments
+                The most comprehensive assessment platform
               </h1>
               <div className="d-flex flex-row justify-content-center flex-wrap">
                 <div className="d-inline-flex flex-column">