Added the possibility to set TTL

gandyndns.py

@@ -2,8 +2,8 @@
 # -*- coding: utf-8 -*-
 # @author: polarolouis
 
-import requests
 import argparse
+import requests
 
 parser = argparse.ArgumentParser(
     description="A script which connect to Gandi.net API to change IP associated to a DNS record")
@@ -18,6 +18,8 @@ parser.add_argument("--destination", metavar="DESTINATION", default="public_ip",
                     help="The destination to point the subdomain to. Might be an IP, for instance 10.0.0.1, might be a subdomain, for instance @. Default: public_ip, which retrieves the machine public ip")
 parser.add_argument("--type", metavar="TYPE", default='A',
                     help="The type of DNS record to create. Default: A", choices=['A', 'CNAME'])
+parser.add_argument("--ttl", metavar="TTL", default=10800,
+                    help="The Time To Live in seconds. This is the number of seconds the record must be stored in cache. Default value is 10800s (3hrs).", type=int)
 args = parser.parse_args()
 print(args)
 
@@ -25,20 +27,21 @@ verbose = args.verbose
 domain = args.domain
 apikey = args.apikey
 subdomain = args.subdomain
-type = args.type
+record_type = args.type
+ttl = args.ttl
 destination = args.destination
 
-domain_record_string = f"DNS {type} record for {subdomain}.{domain}"
+domain_record_string = f"DNS {record_type} record for {subdomain}.{domain}"
 
 domain_record_string_lenght = len(domain_record_string)
 
-apiUrl = f"https://api.gandi.net/v5/livedns/domains/{domain}/records/{subdomain}/{type}"
+api_url = f"https://api.gandi.net/v5/livedns/domains/{domain}/records/{subdomain}/{record_type}"
 
 headers = {"Authorization": f"Apikey {apikey}",
            'User-Agent': 'Mozilla/5.0', "Content-Type": "application/json"}
 
 
-def retrieve_public_IP():
+def retrieve_public_ip():
     """Retrieves the public IP by connecting to ipinfo.io API
 
     Returns:
@@ -50,54 +53,67 @@ def retrieve_public_IP():
     return data['ip']
 
 
-def retrieve_dns_IP(apiUrl, headers):
+def retrieve_dns_ip(api_url, headers):
     """Retrieves the IP in the DNS record using the domain, rrset_name (for instance subdomain like www etc) and rrset_type (the DNS record type A, CNAME ...).
 
     The function uses requests library and connect to Gandi.net API
 
     Returns:
-            retrievedDnsIp (str): string of the IP address in the DNS record"""
+            retrieved_dns_ip (str): string of the IP address in the DNS record"""
     if verbose:
         print("Retrieving the DNS IP")
-    response = requests.get(apiUrl, headers=headers)
+    response = requests.get(api_url, headers=headers)
 
-    responseJson = response.json()  # IPs are stored in a list as string
+    response_json = response.json()  # IPs are stored in a list as string
     try:
-        retrievedDnsIp = responseJson['rrset_values'][0]
+        retrieved_dns_ip = response_json['rrset_values'][0]
+        retrieved_ttl = response_json['rrset_ttl']
     except KeyError as key_error:
         print(
             f"{key_error} means the record doesn't exist, we'll return an empty string instead")
-        retrievedDnsIp = ""
-    return retrievedDnsIp
+        retrieved_dns_ip = ""
+    return retrieved_dns_ip, retrieved_ttl
 
 
-def update_dns_IP(apiUrl, headers):
-    """Updates the IP in the DNS record using the IP provided (acquired by retrieve_public_IP) if it is different from the DNS IP"""
+def update_dns_ip(api_url, headers):
+    """Updates the IP in the DNS record using the IP provided (acquired by retrieve_public_ip) if it is different from the DNS IP"""
     if destination == "public_ip":
-        publicIP = retrieve_public_IP()
+        publicIP = retrieve_public_ip()
     else:
         publicIP = destination
-    dnsIP = retrieve_dns_IP(apiUrl, headers)
+    dnsIP, dns_ttl = retrieve_dns_ip(api_url, headers)
     if verbose:
         print(f"Public IP is : {publicIP}")
         if dnsIP:
             print(f"DNS IP is : {dnsIP}")
         else:
             print("The subdomain doesn't exist, no DNS IP associated")
-    if not publicIP == dnsIP:
-        if verbose:
-            print("IPs do not match, setting DNS IP")
-        data = {
-            "rrset_values": [publicIP]
-        }
+        print(f"DNS TTL is {dns_ttl}")
+    if publicIP != dnsIP or dns_ttl != ttl:
+
+        data = dict()
+
+        data["rrset_values"] = [publicIP]
         print(f"{domain_record_string : <{domain_record_string_lenght}} | Old IP : {dnsIP} replaced -> by New IP : {publicIP}")
-        response = requests.put(url=apiUrl, headers=headers, json=data)
+
+        if dns_ttl != ttl:
+            data["rrset_ttl"] = ttl
+            if verbose:
+                print(f"TTL are differents. DNS TTL {dns_ttl} where wanted TTL is {ttl}")
+        
+        if verbose:
+            print(f"The data to be sent is : {data}")
+        response = requests.put(url=api_url, headers=headers, json=data)
         if verbose:
             print(f"Request exited with status code : {response.status_code}")
     else:
+        if publicIP == dnsIP:
             print(
                 f"{domain_record_string : <{domain_record_string_lenght}} | {'IPs are the same.':<17}")
+        if dns_ttl == ttl:
+            print(
+                f"{domain_record_string : <{domain_record_string_lenght}} | {'TTL are the same':<17}")
 
 
 if __name__ == '__main__':
-    update_dns_IP(apiUrl, headers)
+    update_dns_ip(api_url, headers)