feat(docs): add opengraph to docs for dynamic link preview

apps/docs/app/[lang]/[[...slug]]/page.tsx

@@ -243,6 +243,8 @@ export async function generateMetadata(props: {
   const baseUrl = 'https://docs.sim.ai'
   const fullUrl = `${baseUrl}${page.url}`
 
+  const ogImageUrl = `${baseUrl}/api/og?title=${encodeURIComponent(page.data.title)}&category=DOCUMENTATION`
+
   return {
     title: page.data.title,
     description:
@@ -272,12 +274,23 @@ export async function generateMetadata(props: {
       alternateLocale: ['en', 'es', 'fr', 'de', 'ja', 'zh']
         .filter((lang) => lang !== params.lang)
         .map((lang) => (lang === 'en' ? 'en_US' : `${lang}_${lang.toUpperCase()}`)),
+      images: [
+        {
+          url: ogImageUrl,
+          width: 1200,
+          height: 630,
+          alt: page.data.title,
+        },
+      ],
     },
     twitter: {
-      card: 'summary',
+      card: 'summary_large_image',
       title: page.data.title,
       description:
         page.data.description || 'Sim visual workflow builder for AI applications documentation',
+      images: [ogImageUrl],
+      creator: '@simdotai',
+      site: '@simdotai',
     },
     robots: {
       index: true,

apps/docs/app/api/og/route.tsx

@@ -0,0 +1,146 @@
+import { ImageResponse } from 'next/og'
+import type { NextRequest } from 'next/server'
+
+export const runtime = 'edge'
+
+const TITLE_FONT_SIZE = {
+  large: 64,
+  medium: 56,
+  small: 48,
+} as const
+
+function getTitleFontSize(title: string): number {
+  if (title.length > 45) return TITLE_FONT_SIZE.small
+  if (title.length > 30) return TITLE_FONT_SIZE.medium
+  return TITLE_FONT_SIZE.large
+}
+
+/**
+ * Loads a Google Font dynamically by fetching the CSS and extracting the font URL.
+ */
+async function loadGoogleFont(font: string, text: string): Promise<ArrayBuffer> {
+  const url = `https://fonts.googleapis.com/css2?family=${font}:wght@500;600&text=${encodeURIComponent(text)}`
+  const css = await (await fetch(url)).text()
+  const resource = css.match(/src: url\((.+)\) format\('(opentype|truetype)'\)/)
+
+  if (resource) {
+    const response = await fetch(resource[1])
+    if (response.status === 200) {
+      return await response.arrayBuffer()
+    }
+  }
+
+  throw new Error('Failed to load font data')
+}
+
+/**
+ * Generates dynamic Open Graph images for documentation pages.
+ */
+export async function GET(request: NextRequest) {
+  const { searchParams } = new URL(request.url)
+  const title = searchParams.get('title') || 'Documentation'
+  const category = searchParams.get('category') || 'DOCUMENTATION'
+
+  const baseUrl = new URL(request.url).origin
+  const backgroundImageUrl = `${baseUrl}/static/og-background.png`
+
+  // Load Inter font dynamically from Google Fonts
+  const allText = `${title}${category}docs.sim.ai`
+  const fontData = await loadGoogleFont('Inter', allText)
+
+  return new ImageResponse(
+    <div
+      style={{
+        height: '100%',
+        width: '100%',
+        display: 'flex',
+        flexDirection: 'column',
+        backgroundColor: '#121212',
+        position: 'relative',
+        fontFamily: 'Inter',
+      }}
+    >
+      {/* Background texture */}
+      <img
+        src={backgroundImageUrl}
+        alt=''
+        style={{
+          position: 'absolute',
+          top: 0,
+          left: 0,
+          width: '100%',
+          height: '100%',
+          objectFit: 'cover',
+          opacity: 0.06,
+        }}
+      />
+
+      {/* Content */}
+      <div
+        style={{
+          display: 'flex',
+          flexDirection: 'column',
+          padding: '60px 72px',
+          height: '100%',
+          justifyContent: 'space-between',
+        }}
+      >
+        {/* Logo */}
+        <img src={`${baseUrl}/static/logo.png`} alt='sim' height={36} />
+
+        {/* Category + Title */}
+        <div
+          style={{
+            display: 'flex',
+            flexDirection: 'column',
+            gap: 16,
+          }}
+        >
+          <span
+            style={{
+              fontSize: 14,
+              fontWeight: 500,
+              color: '#737373',
+              letterSpacing: '0.08em',
+            }}
+          >
+            {category}
+          </span>
+          <span
+            style={{
+              fontSize: getTitleFontSize(title),
+              fontWeight: 600,
+              color: '#ffffff',
+              lineHeight: 1.15,
+              letterSpacing: '-0.02em',
+            }}
+          >
+            {title}
+          </span>
+        </div>
+
+        {/* Footer */}
+        <span
+          style={{
+            fontSize: 16,
+            fontWeight: 400,
+            color: '#525252',
+          }}
+        >
+          docs.sim.ai
+        </span>
+      </div>
+    </div>,
+    {
+      width: 1200,
+      height: 630,
+      fonts: [
+        {
+          name: 'Inter',
+          data: fontData,
+          style: 'normal',
+        },
+      ],
+    }
+  )
+}

apps/docs/app/layout.tsx

@@ -56,6 +56,14 @@ export const metadata = {
     title: 'Sim Documentation - Visual Workflow Builder for AI Applications',
     description:
       'Comprehensive documentation for Sim - the visual workflow builder for AI applications. Create powerful AI agents, automation workflows, and data processing pipelines.',
+    images: [
+      {
+        url: 'https://docs.sim.ai/api/og?title=Sim%20Documentation&category=DOCUMENTATION',
+        width: 1200,
+        height: 630,
+        alt: 'Sim Documentation',
+      },
+    ],
   },
   twitter: {
     card: 'summary_large_image',
@@ -64,7 +72,7 @@ export const metadata = {
       'Comprehensive documentation for Sim - the visual workflow builder for AI applications.',
     creator: '@simdotai',
     site: '@simdotai',
-    images: ['/og-image.png'],
+    images: ['https://docs.sim.ai/api/og?title=Sim%20Documentation&category=DOCUMENTATION'],
   },
   robots: {
     index: true,