chore: added zone rebuild using kupo api

README.md

@@ -65,10 +65,16 @@ Using the above example, we can now build a zone file. Using the
 a `.cardano` domain with the data from our example. This is a simple proof of
 concept of transaction parsing using a remote API.
 
+* Using [gomaestro] API:
 ```bash
 export MAESTRO_API_KEY=${MAESTRO_API_KEY}
 python3 dns.py > cardano.zone
 ```
+* Using [kupo] API:
+```bash
+pip install cbor2 uplc
+python3 dns-kupo.py > cardano.zone
+```
 
 The current zone [file](cardano.zone) includes our datum from above.
 
@@ -134,3 +140,6 @@ If these conditions are met, mint a token pair:
 - If I hold a SLD, I can:
     - a. create or edit a DNS record at that SLD, OR
     - b. create 3rdLDs on my SLD
+
+[gomaestro]: https://www.gomaestro.org/
+[kupo]: https://github.com/CardanoSolutions/kupo/

dns-kupo.py

@@ -0,0 +1,46 @@
+#!/usr/bin/env python3
+
+import json
+import os
+import requests
+import time
+import uplc
+import cbor2
+
+ADDRESS = 'addr_test1wqgf0d7rdlamdy46hd5u5wq47ql9chvv8w3k70nyqcfgd2qwpvxpx'
+NETWORK = 'iohk-preprod'
+KUPO_URL = 'https://d.kupo-api.' + NETWORK + '.dandelion.link'
+
+def main():
+    custom_headers = {"Content-Type": "application/json"}
+    utxos = requests.get(f"{KUPO_URL}/matches/{ADDRESS}?unspent", headers=custom_headers, timeout=60)
+    txs = json.loads(utxos.content.decode())
+
+    cardano = dict()
+    now = int(time.time())
+
+    print("$ORIGIN cardano.")
+    print("$TTL 60")
+    print("@ IN SOA ns1.cardano. hostmaster.cardano. "+str(now)+" 21600 3600 604800 60")
+    print("  IN NS ns1.cardano.")
+    print("ns1.cardano. IN A 172.17.0.1")
+
+    for tx in txs:
+        datum_bytes = json.loads(requests.get(f"{KUPO_URL}/datums/{tx['datum_hash']}", headers=custom_headers, timeout=60).content)['datum']
+
+        datum_json = uplc.ast.data_from_cbortag(cbor2.loads(bytes.fromhex(datum_bytes))).to_json()
+
+        name = bytes.fromhex(datum_json['fields'][0]['bytes']).decode()
+        origin = bytes.fromhex(datum_json['fields'][1]['bytes']).decode()
+        soa_raw = datum_json['fields'][2]['fields']
+        ns_list = datum_json['fields'][3]['list']
+
+        if origin.split(".")[-1] == 'cardano':
+            cardano[name] = dict({"origin": origin})
+            for ns in ns_list:
+                print(name + " IN NS " + bytes.fromhex(ns['bytes']).decode() + ".")
+                print(bytes.fromhex(ns['bytes']).decode() + ". IN A 172.17.0.1")
+
+if __name__ == '__main__':
+    main()
+