⚡ (s3) Improve storage management and type safety

Closes #756

packages/lib/s3/getFolderSize.ts

@@ -0,0 +1,42 @@
+import { env } from '@typebot.io/env'
+import { Client } from 'minio'
+
+type Props = {
+  folderPath: string
+}
+
+export const getFolderSize = async ({ folderPath }: Props) => {
+  if (!env.S3_ENDPOINT || !env.S3_ACCESS_KEY || !env.S3_SECRET_KEY)
+    throw new Error(
+      'S3 not properly configured. Missing one of those variables: S3_ENDPOINT, S3_ACCESS_KEY, S3_SECRET_KEY'
+    )
+
+  const minioClient = new Client({
+    endPoint: env.S3_ENDPOINT,
+    port: env.S3_PORT,
+    useSSL: env.S3_SSL,
+    accessKey: env.S3_ACCESS_KEY,
+    secretKey: env.S3_SECRET_KEY,
+    region: env.S3_REGION,
+  })
+
+  return new Promise<number>((resolve, reject) => {
+    let totalSize = 0
+
+    const stream = minioClient.listObjectsV2(
+      env.S3_BUCKET,
+      'public/' + folderPath,
+      true
+    )
+
+    stream.on('data', function (obj) {
+      totalSize += obj.size
+    })
+    stream.on('error', function (err) {
+      reject(err)
+    })
+    stream.on('end', function () {
+      resolve(totalSize)
+    })
+  })
+}