porkbun-ddns.py

import json
import requests
import sys

def printIfAllowed(content): #print the status of a json query if it is not a success or if quiet mode is not enabled
	if ("error" in content.lower()) or canPrint:
		print(content)

def getRecords(domain): #grab all the records so we know which ones to delete to make room for our record. Also checks to make sure we've got the right domain
	allRecords=json.loads(requests.post(apiConfig["endpoint"] + '/dns/retrieve/' + domain, data = json.dumps(apiConfig)).text)
	if allRecords["status"]=="ERROR":
		# No reason to feed into printIfAllowed, it will always print
		print('Error getting domain. Check to make sure you specified the correct domain, and that API access has been switched on for this domain.')
		sys.exit()
	return(allRecords)
	
def getMyIP():
	ping = json.loads(requests.post(apiConfig["endpoint"] + '/ping/', data = json.dumps(apiConfig)).text)
	return(ping["yourIp"])

def replaceInvalidRecords():
	for i in getRecords(rootDomain)["records"]:
		if i["name"]==fqdn and (i["type"] == 'A' or i["type"] == 'ALIAS' or i["type"] == 'CNAME') or i["type"] == "MX":
			if myIP != i["content"]:
				printIfAllowed("Deleting existing " + i["type"] + " Record")
				printIfAllowed( "DELETE: " + (json.loads(requests.post(apiConfig["endpoint"] + '/dns/delete/' + rootDomain + '/' + i["id"], data = json.dumps(apiConfig)).text)["status"]) )
				printIfAllowed( "CREATE: " + (createRecord()["status"]) )

def createRecord():
	createObj=apiConfig.copy()
	createObj.update({'name': subDomain, 'type': 'A', 'content': myIP, 'ttl': 300})
	endpoint = apiConfig["endpoint"] + '/dns/create/' + rootDomain
	printIfAllowed("Creating record: " + fqdn + " with answer of " + myIP)
	create = json.loads(requests.post(apiConfig["endpoint"] + '/dns/create/'+ rootDomain, data = json.dumps(createObj)).text)
	return(create)

if len(sys.argv)>2: #at least the config and root domain is specified
	apiConfig = json.load(open(sys.argv[1])) #load the config file into a variable
	rootDomain=sys.argv[2].lower()
	canPrint=not apiConfig["quiet"].lower=="true"
	del apiConfig["quiet"] # Remove quiet so it doesn't get send with the API requests
		
	if len(sys.argv)>3 and sys.argv[3]!='-i': #check if a subdomain was specified as the third argument
		subDomain=sys.argv[3].lower()
		fqdn=subDomain + "." + rootDomain
	else:
		subDomain=''
		fqdn=rootDomain

	if len(sys.argv)>4 and sys.argv[3]=='-i': #check if IP is manually specified. There's probably a more-elegant way to do this
		myIP=sys.argv[4]
	elif len(sys.argv)>5 and sys.argv[4]=='-i':
		myIP=sys.argv[5]
	else:
		myIP=getMyIP() #otherwise use the detected exterior IP address
	
	replaceInvalidRecords()
	
else:
	# No reason to feed into printIfAllowed, it will always print
	print("Porkbun Dynamic DNS client, Python Edition\n\nError: not enough arguments. Examples:\npython porkbun-ddns.py /path/to/config.json example.com\npython porkbun-ddns.py /path/to/config.json example.com www\npython porkbun-ddns.py /path/to/config.json example.com '*'\npython porkbun-ddns.py /path/to/config.json example.com -i 10.0.0.1\n")