Add avatar-bubbles endpoint to bskyogcard (#10327)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: rafaeleyng <rafaeleyng@gmail.com>

bskyogcard/src/routes/avatar-bubbles.tsx

@@ -0,0 +1,70 @@
+import resvg from '@resvg/resvg-js'
+import {type Express} from 'express'
+import satori from 'satori'
+
+import {
+  AVATAR_BUBBLES_SIZE,
+  AvatarBubbles,
+} from '../components/AvatarBubbles.js'
+import {type AppContext} from '../context.js'
+import {httpLogger} from '../logger.js'
+import {
+  getImage,
+  handler,
+  hideAvatarLabels,
+  originVerifyMiddleware,
+} from './util.js'
+
+export default function (ctx: AppContext, app: Express) {
+  return app.get(
+    '/avatar-bubbles',
+    originVerifyMiddleware(ctx),
+    handler(async (req, res) => {
+      const didsParam = req.query.dids
+      if (typeof didsParam !== 'string') {
+        return res.status(400).end('missing dids parameter')
+      }
+      const dids = didsParam.split(',').filter(Boolean)
+      if (dids.length < 1 || dids.length > 4) {
+        return res.status(400).end('dids must contain 1-4 DIDs')
+      }
+
+      let profiles
+      try {
+        const result = await ctx.appviewAgent.api.app.bsky.actor.getProfiles({
+          actors: dids,
+        })
+        profiles = result.data.profiles
+      } catch (err) {
+        httpLogger.warn({err, dids}, 'could not fetch profiles')
+        return res.status(502).end('could not fetch profiles')
+      }
+
+      const images = await Promise.all(
+        dids.map(async did => {
+          const profile = profiles.find(p => p.did === did)
+          if (!profile?.avatar) return null
+          if (profile.labels?.some(l => hideAvatarLabels.has(l.val)))
+            return null
+          try {
+            return await getImage(profile.avatar)
+          } catch (err) {
+            httpLogger.warn({err, did}, 'could not fetch avatar image')
+            return null
+          }
+        }),
+      )
+
+      const svg = await satori(<AvatarBubbles images={images} />, {
+        fonts: ctx.fonts,
+        height: AVATAR_BUBBLES_SIZE,
+        width: AVATAR_BUBBLES_SIZE,
+      })
+      const output = await resvg.renderAsync(svg)
+      res.statusCode = 200
+      res.setHeader('content-type', 'image/png')
+      res.setHeader('cdn-tag', dids.join(','))
+      return res.end(output.asPng())
+    }),
+  )
+}