edit-acme-dns-accounts.py
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	#!/usr/bin/env python3
	# -- coding: utf-8 --

	# -------------------------------------------------------------
	# Let's encrypt — ACME DNS server accounts editor
	# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	# Project: Nasqueron
	# Created: 2020-02-22
	# Description: Edit /srv/letsencrypt/etc/acmedns.json to import
	# credentials for a specific subdomain to verify.
	# License: BSD-2-Clause
	# -------------------------------------------------------------


	import json
	import os
	import sys


	def get_acme_accounts_path():
	try:
	return os.environ["ACME_ACCOUNTS"]
	except KeyError:
	return "/srv/letsencrypt/etc/acmedns.json"


	ACME_ACCOUNTS_PATH = get_acme_accounts_path()


	class AcmeAccounts:
	def __init__(self, path):
	self.path = path
	self.accounts = {}

	def read_from_file(self):
	with open(self.path) as fd:
	self.accounts = json.load(fd)

	return self

	def write_to_file(self):
	with open(self.path, "w") as fd:
	json.dump(self.accounts, fd)

	return self

	def add(self, domain, account_parameters):
	self.accounts[domain] = account_parameters

	return self

	def remove(self, domain):
	try:
	del self.accounts[domain]
	return True
	except KeyError:
	return False

	def merge_with(self, other_accounts: "AcmeAccounts"):
	self.accounts.update(other_accounts.accounts)

	return self


	def usage():
	print(f"Usage: {sys.argv[0]} <command> [parameters]", file=sys.stderr)
	exit(1)


	def import_other_file(file_to_import):
	if file_to_import == ACME_ACCOUNTS_PATH:
	print(f"You're trying to import {ACME_ACCOUNTS_PATH} to itself")
	exit(2)

	accounts_to_import = AcmeAccounts(file_to_import).read_from_file()

	AcmeAccounts(ACME_ACCOUNTS_PATH).read_from_file().merge_with(
	accounts_to_import
	).write_to_file()


	commands = {
	"import": {
	"required_argc": 3,
	"command_usage": "import <file>",
	"callable": import_other_file,
	},
	}


	if __name__ == "__main__":
	argc = len(sys.argv)

	if argc < 2 or sys.argv[1] in ["-h", "--help", "/?", "/help"]:
	usage()

	command = sys.argv[1]

	if command not in commands:
	print(f"Unknown command: {command}", file=sys.stderr)
	usage()

	command = commands[command]

	if argc < command["required_argc"]:
	print(f"Usage: {sys.argv[0]} {command['command_usage']}", file=sys.stderr)
	exit(1)

	# We're good, time to invoke our command
	command["callable"](*sys.argv[2:])

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