badge: add Mastodon/Pleroma support (#396)

* badge: add mastodon/pleroma support

* badge(mastodon): avoid description overflow

api/mastodon.ts

@@ -0,0 +1,26 @@
+import got from '../libs/got'
+import { millify } from '../libs/utils'
+import { createBadgenHandler, PathArgs } from '../libs/create-badgen-handler'
+
+export default createBadgenHandler({
+  title: 'Mastodon/Pleroma',
+  examples: {
+    '/mastodon/follow/1': 'followers (mastodon.social)',
+    '/mastodon/follow/1/mas.to': 'followers (other Mastodon instance)',
+    '/mastodon/follow/1/pleroma.site': 'followers (Pleroma instance)',
+  },
+  handlers: {
+    '/mastodon/follow/:userId/:instance?': handler
+  }
+})
+
+async function handler ({ userId, instance = 'mastodon.social' }: PathArgs) {
+  const prefixUrl = `https://${instance}/api/v1/`
+  const info = await got(`accounts/${userId}`, { prefixUrl }).json<any>()
+
+  return {
+    subject: `follow @${info.username}@${instance}`,
+    status: millify(info.followers_count),
+    color: '3487CE'
+  }
+}

libs/badge-list.ts

@@ -52,6 +52,7 @@ export const liveBadgeList = [
   'opencollective',
   'keybase',
   'twitter',
+  'mastodon',
   'tidelift',
   'runkit',
   'https',