Function uuidV5

apps/sim/lib/workspaces/fork/remap/block-identity.ts:19–28

* Deterministic UUIDv5 (SHA-1) of `name` within `namespace`. The same inputs * always yield the same UUID, which is how fork block identity stays stable.

(name: string, namespace: string)

 * always yield the same UUID, which is how fork block identity stays stable.
 */
function uuidV5(name: string, namespace: string): string {
  const hash = createHash('sha1')
  hash.update(uuidToBytes(namespace))
  hash.update(Buffer.from(name, 'utf8'))
  const bytes = hash.digest().subarray(0, 16)
  bytes[6] = (bytes[6] & 0x0f) | 0x50
  bytes[8] = (bytes[8] & 0x3f) | 0x80
  const hex = bytes.toString('hex')
  return `${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20)}`
}

/**
 * Derive the target block id for a source block copied into a target workflow.