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-#+title: Dynamic DNS with Njalla API
-#+date:  2022-06-04
-
-** Njalla's API
-:PROPERTIES:
-:CUSTOM_ID: njallas-api
-:END:
-As noted in my recent post about [[/blog/ditching-cloudflare/][switching
-to Njalla from Cloudflare]], I was searching for a way to replace my
-very easy-to-use bash script to [[/blog/cloudflare-dns-api/][update
-Cloudflare's DNS via their API]].
-
-To reiterate what I said in those posts, this is a common necessity for
-those of us who have non-static IP addresses that can change at any
-moment due to ISP policy.
-
-In order to keep a home server running smoothly, the server admin needs
-to have a process to constantly monitor their public IP address and
-update their domain's DNS records if it changes.
-
-This post explains how to use Python to update Njalla's DNS records
-whenever a machine's public IP address changes.
-
-*** Creating a Token
-:PROPERTIES:
-:CUSTOM_ID: creating-a-token
-:END:
-To use Njalla's API, you will first need to create a token that will be
-used to authenticate you every time you call the API. Luckily, this is
-very easy to do if you have an account with Njalla.
-
-Simply go the [[https://njal.la/settings/api/][API Settings]] page and
-click the =Add Token= button. Next, enter a name for the token and click
-=Add=.
-
-Finally, click the =Manage= button next to your newly created token and
-copy the =API Token= field.
-
-*** Finding the Correct API Request
-:PROPERTIES:
-:CUSTOM_ID: finding-the-correct-api-request
-:END:
-Once you have a token, you're ready to call the Njalla API for any
-number of requests. For a full listing of available requests, see the
-[[https://njal.la/api/][Njalla API Documentation]].
-
-For this demo, we are using the =list-records= and =edit-record=
-requests.
-
-The =list-records= request requires the following payload to be sent
-when calling the API:
-
-#+begin_src txt
-params: {
-    domain: string
-}
-#+end_src
-
-The =edit-record= request requires the following payload to be sent when
-calling the API:
-
-#+begin_src txt
-params: {
-    domain: string
-    id: int
-    content: string
-}
-#+end_src
-
-** Server Set-Up
-:PROPERTIES:
-:CUSTOM_ID: server-set-up
-:END:
-To create this script, we will be using Python. By default, I use Python
-3 on my servers, so please note that I did not test this in Python 2,
-and I do not know if Python 2 will work for this.
-
-*** Creating the Script
-:PROPERTIES:
-:CUSTOM_ID: creating-the-script
-:END:
-First, find a suitable place to create your script. Personally, I just
-create a directory called =ddns= in my home directory:
-
-#+begin_src sh
-mkdir ~/ddns
-#+end_src
-
-Next, create a Python script file:
-
-#+begin_src sh
-nano ~/ddns/ddns.py
-#+end_src
-
-The following code snippet is quite long, so I won't go into depth on
-each part. However, I suggest you read through the entire script before
-running it; it is quite simple and contains comments to help explain
-each code block.
-
-:warning: *Note*: You will need to update the following variables for
-this to work:
-
-- =token=: This is the Njalla API token you created earlier.
-- =user_domain=: This is the top-level domain you want to modify.
-- =include_subdomains=: Set this to =True= if you also want to modify
-  subdomains found under the TLD.
-- =subdomains=: If =include_subdomains= = =True=, you can include your
-  list of subdomains to be modified here.
-
-#+begin_src python
-#!/usr/bin/python
-# -*- coding: utf-8 -*-
-# Import Python modules
-
-from requests import get
-import requests
-import json
-
-# Set global variables
-
-url = 'https://njal.la/api/1/'
-token = '<your-api-token>'
-user_domain = 'example.com'
-include_subdomains = True
-subdomains = ['one', 'two']
-
-
-# Main API call function
-
-def njalla(method, **params):
-    headers = {'Authorization': 'Njalla ' + token}
-    response = requests.post(url, json={'method': method,
-                             'params': params}, headers=headers).json()
-    if 'result' not in response:
-        raise Exception('API Error', response)
-    return response['result']
-
-
-# Gather all DNS records for a domain
-
-def get_records(domain):
-    return njalla('list-records', domain=user_domain)
-
-
-# Update a DNS record for a domain
-
-def update_record(domain, record_id, record_content):
-    return njalla('edit-record', domain=domain, id=record_id,
-                  content=record_content)
-
-
-# Get public IP addresses
-
-ipv4 = get('https://api.ipify.org').text
-print('IPv4: {}'.format(ipv4))
-ipv6 = get('https://api64.ipify.org').text
-print('IPv6: {}'.format(ipv6))
-
-# Call API to get all DNS records
-
-data = get_records(user_domain)
-
-# Loop through records and check if each one is IPv4 (A) or IPv6 (AAAA)
-# Update only if DNS is different from server IP
-
-for record in data['records']:
-    if record['name'] == '@' or (include_subdomains and record['name'] \
-        in subdomains):
-        if record['type'] == 'A':
-            if record['content'] == ipv4:
-                print(record['type'], 'record for', record['name'],
-                      'already matches public IPv4 address. Skipping...'
-                      )
-            else:
-                print('IPv4 of', ipv4,
-                      'does not match Njalla\'s value of',
-                      record['content'], '. Updating...')
-                update_record(user_domain, record['id'], ipv4)
-        elif record['type'] == 'AAAA':
-            if record['content'] == ipv6:
-                print(record['type'], 'record for', record['name'],
-                      'already matches public IPv6 address. Skipping...'
-                      )
-            else:
-                print('IPv6 of', ipv6,
-                      'does not match Njalla\'s value of',
-                      record['content'], '. Updating...')
-                update_record(user_domain, record['id'], ipv6)
-#+end_src
-
-*** Running the Script
-:PROPERTIES:
-:CUSTOM_ID: running-the-script
-:END:
-Once you've created the script and are ready to test it, run the
-following command:
-
-#+begin_src sh
-python3 ~/ddns/ddns.py
-#+end_src
-
-*** Setting the Script to Run Automatically
-:PROPERTIES:
-:CUSTOM_ID: setting-the-script-to-run-automatically
-:END:
-To make sure the scripts run automatically, add it to the =cron= file so
-that it will run on a schedule. To do this, open the =cron= file:
-
-#+begin_src sh
-crontab -e
-#+end_src
-
-In the cron file, paste the following at the bottom of the editor in
-order to check the IP every five minutes:
-
-#+begin_src sh
-*/5 * * * * python3 /home/<your_username>/ddns/ddns.py
-#+end_src