badge: add tidelift subscription badge (#391)

api/tidelift.ts

@@ -0,0 +1,36 @@
+import got from '../libs/got'
+import { basename, extname } from 'path'
+import { createBadgenHandler, PathArgs } from '../libs/create-badgen-handler'
+
+const TIDELIFT_BADGE_URL = 'https://tidelift.com/badges/package/'
+
+const client = got.extend({ prefixUrl: TIDELIFT_BADGE_URL })
+
+export default createBadgenHandler({
+  title: 'Tidelift',
+  examples: {
+    '/tidelift/npm/minimist': 'subscription',
+    '/tidelift/npm/got': 'subscription'
+  },
+  handlers: {
+    '/tidelift/:platform/:name': handler
+  }
+})
+
+async function handler ({ platform, name }: PathArgs) {
+  const resp = await client.get(`${platform}/${name}`, { followRedirect: false })
+  // this shouldn't happen, but in case it happens
+  if (!resp.headers.location) {
+    throw new Error(`Unknown Tidelift status: ${platform}/${name}`)
+  }
+  const { pathname } = new URL(resp.headers.location)
+  const [status, color] = decodeURIComponent(basename(pathname, extname(pathname)))
+    .split('-')
+    .filter(Boolean)
+
+  return {
+    subject: 'tidelift',
+    status,
+    color
+  }
+}

libs/badge-list.ts

@@ -50,6 +50,7 @@ export const liveBadgeList = [
   'opencollective',
   'keybase',
   'twitter',
+  'tidelift',
   'runkit',
   'https',
 ]