From f13eee8eb36d6f7d2f770b4fa1069055caa4b305 Mon Sep 17 00:00:00 2001
From: Alexandre Stahmer <alexandre.stahmer@gmail.com>
Date: Sat, 2 Dec 2023 17:50:16 +0100
Subject: [PATCH] feat: add og.png for posts

---
 src/pages/posts/og.png.ts | 155 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 155 insertions(+)
 create mode 100644 src/pages/posts/og.png.ts

diff --git a/src/pages/posts/og.png.ts b/src/pages/posts/og.png.ts
new file mode 100644
index 0000000..ceb1acc
--- /dev/null
+++ b/src/pages/posts/og.png.ts
@@ -0,0 +1,155 @@
+import { getCollection, type CollectionEntry } from 'astro:content'
+import fs from 'fs'
+import path from 'path'
+import { ImageResponse } from '@vercel/og'
+import { formatDate } from '@/utils/formatDate'
+
+interface Props {
+  params: { slug: string }
+  props: { post: CollectionEntry<'articles'> }
+}
+
+export async function GET({ props }: Props) {
+  const { post } = props
+
+  // using custom font files
+  const fontPath = path.resolve('./assets/Inter-Bold.ttf')
+  const InterBold = fs.readFileSync(fontPath)
+
+  const bgImage = fs.readFileSync(path.resolve('./assets/og-image-background.png'))
+  const profilePic = fs.readFileSync(path.resolve('./assets/alex-profile-pic.png'))
+
+  // Astro doesn't support tsx endpoints so usign React-element objects
+  const html = {
+    type: 'div',
+    props: {
+      tw: 'flex w-full h-full flex relative',
+      style: {
+        fontFamily: 'Inter Bold',
+        alignItems: 'flex-end',
+      },
+      children: [
+        {
+          type: 'div',
+          props: {
+            tw: 'flex w-full h-full top-[-70px] absolute',
+            children: [
+              {
+                type: 'img',
+                tw: 'flex-1 w-full h-full',
+                props: {
+                  styles: {
+                    objectFit: 'cover',
+                    objectPosition: 'center',
+                  },
+                  src: bgImage.buffer,
+                },
+              },
+            ],
+          },
+        },
+        {
+          type: 'div',
+          props: {
+            tw: 'ml-[40px] mb-[180px] flex flex-1 flex-col',
+            children: [
+              {
+                type: 'div',
+                props: {
+                  tw: 'mr-auto flex items-center mb-[40px]',
+                  children: [
+                    {
+                      type: 'div',
+                      props: {
+                        tw: 'flex w-[100px] h-[100px]',
+                        children: [
+                          {
+                            type: 'img',
+                            tw: 'flex-1 w-full h-full',
+                            props: {
+                              styles: {
+                                objectFit: 'cover',
+                                objectPosition: 'center',
+                              },
+                              src: profilePic.buffer,
+                            },
+                          },
+                        ],
+                      },
+                    },
+                    {
+                      type: 'div',
+                      props: {
+                        tw: 'flex mx-[20px]',
+                        children: ['Alexandre Stahmer'],
+                        style: {
+                          fontSize: '32px',
+                          color: '#f0f9ff',
+                        },
+                      },
+                    },
+                  ],
+                },
+              },
+              {
+                type: 'div',
+                props: {
+                  style: {
+                    fontSize: '68px',
+                    color: '#f0f9ff',
+                  },
+                  children: post.data.title,
+                },
+              },
+            ],
+          },
+        },
+        {
+          type: 'div',
+          props: {
+            tw: 'flex w-[35%]',
+          },
+        },
+        {
+          type: 'div',
+          props: {
+            tw: 'absolute left-[40px] bottom-[40px] flex items-center',
+            children: [
+              {
+                type: 'div',
+                props: {
+                  tw: 'text-2xl',
+                  style: {
+                    color: '#fefce8',
+                  },
+                  children: 'astahmer.dev - ' + formatDate(post.data.date),
+                },
+              },
+            ],
+          },
+        },
+      ],
+    },
+  }
+
+  return new ImageResponse(html as any, {
+    width: 1200,
+    height: 600,
+    fonts: [
+      {
+        name: 'Inter Bold',
+        data: InterBold.buffer,
+        style: 'normal',
+      },
+    ],
+  })
+}
+
+// to generate an image for each blog posts in a collection
+export async function getStaticPaths() {
+  const blogPosts = await getCollection('posts')
+  return blogPosts.map((post) => ({
+    params: { slug: post.slug },
+    props: { post },
+  }))
+}