feat: add WIP Cloudflare handler

nyacme/handlers/__init__.py

@@ -1,7 +1,9 @@
+from .cloudflare import CloudflareHandler
 from .hetzner import HetznerHandler
 from .http import HTTPHandler
 
 __all__ = [
+    'CloudflareHandler',
     'HetznerHandler',
     'HTTPHandler'
 ]

nyacme/handlers/cloudflare.py

@@ -0,0 +1,50 @@
+import json
+import os
+import subprocess
+from typing import Any
+
+import dns.resolver
+
+from ..config import Config
+from .base import Handler
+
+
+class CloudflareHandler(Handler):
+    nameservers: list[str]
+
+    def __init__(self, zone_name: str, config: Config, token: str) -> None:
+        super().__init__(zone_name, config, token)
+        self.secret = config.get_secret('cloudflare')
+
+        servers = dns.resolver.resolve(zone_name, 'NS')
+        self.nameservers = list(map(lambda rdata: str(rdata.target).strip('.'), servers))
+
+    def run(self, args: list[str]) -> Any:
+        env = os.environ.copy()
+        env['CF_API_TOKEN'] = self.secret
+        res = subprocess.run(['flarectl', '--json'] + args, check=True, stdout=subprocess.PIPE)
+        return json.loads(res.stdout)
+
+    def create(self, record_name: str, record_value: str) -> None:
+        full_record_name = record_name + '.' + self.zone
+        self.remove(record_name)
+        self.log.info('creating %s with value %s', full_record_name, record_value)
+        self.run([
+            'dns', 'create',
+            '--zone', self.zone,
+            '--type', 'TXT',
+            '--name', full_record_name,
+            '--content', record_value,
+        ])
+
+    def remove(self, record_name: str) -> None:
+        records = self.run(['dns', 'list', '--zone', self.zone])
+        full_record_name = record_name + '.' + self.zone
+        for record in records:
+            if record['Name'] == full_record_name:
+                self.log.info('removing %s', full_record_name)
+                self.run([
+                    'dns', 'delete',
+                    '--zone', self.zone,
+                    '--id', record['ID']
+                ])

nyacme/hook.py

@@ -7,13 +7,14 @@ from itertools import chain
 import dns.resolver
 
 from .config import read_config
-from .handlers import HetznerHandler, HTTPHandler
+from .handlers import CloudflareHandler, HetznerHandler, HTTPHandler
 
 logging.basicConfig(level=logging.INFO, format='> [%(levelname)s] %(name)s: %(message)s')
 log = logging.getLogger('nyacme_hook')
 
 
 handlers = {
+    'cloudflare': CloudflareHandler,
     'hetzner': HetznerHandler,
     'http': HTTPHandler,
 }