Adjust logic for two artifacts

.gitignore

@@ -114,3 +114,5 @@ dist
 .yarn/unplugged
 .yarn/build-state.yml
 .pnp.*
+
+.vercel

api/[arch].ts

@@ -0,0 +1,46 @@
+import {NowRequest, NowResponse} from '@now/node'
+import got from 'got';
+
+type Arch = 'arm64' | 'x64';
+
+interface Asset {
+  name: string
+  browser_download_url: string
+}
+
+export default async (req: NowRequest, res: NowResponse) => {
+  const {arch} = req.query as { arch: Arch };
+
+  if (arch !== 'arm64' && arch !== 'x64') {
+    return res.status(400).send(`Unrecognized arch "${arch}". Expected x64 or arm64.`);
+  }
+
+  const {body} = await got.get<{assets?: Asset[]}>('https://api.github.com/repos/wulkano/kap/releases/latest', {
+    responseType: 'json'
+  });
+
+  const assets = body.assets ?? [];
+
+  const dmgArtifact = arch === 'arm64' ? arm64Asset(assets) : x64Asset(assets);
+  const dmgLink = dmgArtifact?.browser_download_url;
+
+  if (dmgLink) {
+    res.writeHead(302, {
+      Location: dmgLink
+    });
+    res.end();
+  } else {
+    res.status(404);
+    res.send('Artifact not found');
+  }
+}
+
+function arm64Asset(assets: Asset[]) {
+  return assets.find(asset => asset.name.endsWith('arm64.dmg'));
+}
+
+function x64Asset(assets: Asset[]) {
+  return assets.find(asset => asset.name.endsWith('x64.dmg')) ??
+    // Compatibility with odler assets, when x64 was just named `Kap-x.x.x.dmg`
+    assets.find(asset => asset.name.endsWith('.dmg') && !asset.name.endsWith('arm64.dmg'))
+}

api/index.ts

@@ -1,21 +1,6 @@
 import {NowRequest, NowResponse} from '@now/node'
-import got from 'got';
 
-export default async (req: NowRequest, res: NowResponse) => {
-  const {body} = await got.get<any>('https://api.github.com/repos/wulkano/kap/releases/latest', {
-    responseType: 'json'
-  });
-
-  const dmgArtifact = (body.assets || []).find(asset => asset.name.includes('dmg'));
-  const dmgLink = dmgArtifact && dmgArtifact.browser_download_url;
-
-  if (dmgLink) {
-    res.writeHead(302, {
-      Location: dmgLink
-    });
-    res.end();
-  } else {
-    res.status(404);
-    res.send('Artifact not found');
-  }
-}
+export default (req: NowRequest, res: NowResponse) => {
+  res.setHeader('Cache-Control', 'public, max-age=31536000');
+  return res.status(410).send('Use /api/x64 or /api/arm64 instead');
+}

package.json

@@ -7,7 +7,7 @@
     "got": "^11.0.2"
   },
   "devDependencies": {
-    "@now/node": "^1.5.1",
+    "@now/node": "^1.8.5",
     "@types/got": "^9.6.10",
     "@types/node": "^13.13.2",
     "typescript": "^3.8.3"