implement feedback

packages/artifact/src/internal/upload/retention.ts

@@ -0,0 +1,34 @@
+import {Timestamp} from '../../generated'
+import * as core from '@actions/core'
+
+export function getExpiration(retentionDays?: number): Timestamp | undefined {
+  if (!retentionDays) {
+    return undefined
+  }
+
+  const maxRetentionDays = getRetentionDays()
+  if (maxRetentionDays && maxRetentionDays < retentionDays) {
+    core.warning(
+      `Retention days cannot be greater than the maximum allowed retention set within the repository. Using ${maxRetentionDays} instead.`
+    )
+    retentionDays = maxRetentionDays
+  }
+
+  const expirationDate = new Date()
+  expirationDate.setDate(expirationDate.getDate() + retentionDays)
+
+  return Timestamp.fromDate(expirationDate)
+}
+
+function getRetentionDays(): number | undefined {
+  const retentionDays = process.env['GITHUB_RETENTION_DAYS']
+  if (!retentionDays) {
+    return undefined
+  }
+  const days = parseInt(retentionDays)
+  if (isNaN(days)) {
+    return undefined
+  }
+
+  return days
+}