feat: generate og image using templates

src/utils/generateOgImages.tsx

@@ -1,8 +1,8 @@
 import satori, { type SatoriOptions } from "satori";
-import { writeFile } from "node:fs/promises";
 import { Resvg } from "@resvg/resvg-js";
-import { getCollection } from "astro:content";
+import { type CollectionEntry } from "astro:content";
 import postOgImage from "./og-templates/post";
+import siteOgImage from "./og-templates/site";
 
 const fetchFonts = async () => {
   // Regular Font
@@ -42,42 +42,18 @@ const options: SatoriOptions = {
   ],
 };
 
-const generateOgImages = async () => {
-  const postImportResult = await getCollection(
-    "blog",
-    ({ data }) => !data.draft
-  );
-  const posts = Object.values(postImportResult).filter(
-    ({ data }) => !data.ogImage
-  );
-
-  const imageGenerationPromises = posts.map(async post => {
-    const svg = await satori(postOgImage(post.data.title), options);
-
-    // render png in production mode
-    if (import.meta.env.MODE === "production") {
-      const resvg = new Resvg(svg);
-      const pngData = resvg.render();
-      const pngBuffer = pngData.asPng();
-
-      const outputImage = `${post.slug}.png`;
-
-      const LIGHT_BLUE = "\x1b[94m";
-      const DARK_GRAY = "\x1b[30m";
-      const RESET = "\x1b[0m";
-      console.info(
-        `  ${LIGHT_BLUE}└─${RESET} output png image:`,
-        `${DARK_GRAY}/${outputImage}${RESET}`
-      );
-
-      await writeFile(`./dist/${outputImage}`, pngBuffer);
-    }
-  });
-
-  // Wait for all image generation operations to complete
-  await Promise.all(imageGenerationPromises);
-
-  return null;
-};
-
-export default generateOgImages;
+function svgBufferToPngBuffer(svg: string) {
+  const resvg = new Resvg(svg);
+  const pngData = resvg.render();
+  return pngData.asPng();
+}
+
+export async function generateOgImageForPost(post: CollectionEntry<"blog">) {
+  const svg = await satori(postOgImage(post), options);
+  return svgBufferToPngBuffer(svg);
+}
+
+export async function generateOgImageForSite() {
+  const svg = await satori(siteOgImage(), options);
+  return svgBufferToPngBuffer(svg);
+}

src/utils/og-templates/site.tsx

@@ -0,0 +1,87 @@
+import { SITE } from "@config";
+
+export default () => {
+  return (
+    <div
+      style={{
+        background: "#fefbfb",
+        width: "100%",
+        height: "100%",
+        display: "flex",
+        alignItems: "center",
+        justifyContent: "center",
+      }}
+    >
+      <div
+        style={{
+          position: "absolute",
+          top: "-1px",
+          right: "-1px",
+          border: "4px solid #000",
+          background: "#ecebeb",
+          opacity: "0.9",
+          borderRadius: "4px",
+          display: "flex",
+          justifyContent: "center",
+          margin: "2.5rem",
+          width: "88%",
+          height: "80%",
+        }}
+      />
+
+      <div
+        style={{
+          border: "4px solid #000",
+          background: "#fefbfb",
+          borderRadius: "4px",
+          display: "flex",
+          justifyContent: "center",
+          margin: "2rem",
+          width: "88%",
+          height: "80%",
+        }}
+      >
+        <div
+          style={{
+            display: "flex",
+            flexDirection: "column",
+            justifyContent: "space-between",
+            margin: "20px",
+            width: "90%",
+            height: "90%",
+          }}
+        >
+          <div
+            style={{
+              display: "flex",
+              flexDirection: "column",
+              justifyContent: "center",
+              alignItems: "center",
+              height: "90%",
+              maxHeight: "90%",
+              overflow: "hidden",
+              textAlign: "center",
+            }}
+          >
+            <p style={{ fontSize: 72, fontWeight: "bold" }}>{SITE.title}</p>
+            <p style={{ fontSize: 28 }}>{SITE.desc}</p>
+          </div>
+
+          <div
+            style={{
+              display: "flex",
+              justifyContent: "flex-end",
+              width: "100%",
+              marginBottom: "8px",
+              fontSize: 28,
+            }}
+          >
+            <span style={{ overflow: "hidden", fontWeight: "bold" }}>
+              {new URL(SITE.website).hostname}
+            </span>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+};