#!/usr/bin/env python
 # ICANN API for the Centralized Zones Data Service - developed by acidvegas (https://git.acid.vegas/czds)
 # Reference: https://czds.icann.org
 
 import argparse
 import concurrent.futures
 import getpass
 import json
 import logging
 import os
 import time
 import urllib.request
 
 
 # Setting up logging
 logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
 
 
 def authenticate(username: str, password: str) -> str:
 	'''
 	Authenticate with the ICANN API and return the access token.
 
 	:param username: ICANN Username
 	:param password: ICANN Password
 	'''
 
 	data	= json.dumps({'username': username, 'password': password}).encode('utf-8')
 	headers = {'Content-Type': 'application/json'}
 	request = urllib.request.Request('https://account-api.icann.org/api/authenticate', data=data, headers=headers)
 
 	with urllib.request.urlopen(request) as response:
 		response = response.read().decode('utf-8')
 		return json.loads(response)['accessToken']
 
 
 def fetch_zone_links(token: str) -> list:
 	'''
 	Fetch the list of zone files available for download.
 
 	:param token: ICANN access token
 	'''
 
 	headers = {'Authorization': f'Bearer {token}'}
 	request = urllib.request.Request('https://czds-api.icann.org/czds/downloads/links', headers=headers)
 
 	with urllib.request.urlopen(request) as response:
 		if response.status == 200:
 			return json.loads(response.read().decode('utf-8'))
 		else:
 			raise Exception(f'Failed to fetch zone links: {response.status} {response.reason}')
 
 
 def download_report(token: str, output_directory: str, username: str):
 	'''
 	Downloads the zone report stats from the API and scrubs the report for privacy.
 
 	:param token: ICANN access token
 	:param output_directory: Directory to save the scrubbed report
 	:param username: Username to be redacted
 	'''
 
 	filepath = os.path.join(output_directory, '.stats.csv')
 	headers  = {'Authorization': f'Bearer {token}'}
 	request  = urllib.request.Request('https://czds-api.icann.org/czds/requests/report', headers=headers)
 
 	with urllib.request.urlopen(request) as response:
 		if response.status == 200:
 			report_data = response.read().decode('utf-8').replace(username, 'nobody@no.name')
 			with open(filepath, 'w') as file:
 				file.write(report_data)
 		else:
 			raise Exception(f'Failed to download the zone stats report: {response.status} {response.reason}')
 
 
 
 def download_zone(url: str, token: str, output_directory: str):
 	'''
 	Download a single zone file using urllib.request.
 
 	:param url: URL to download
 	:param token: ICANN access token
 	:param output_directory: Directory to save the zone file
 	'''
 
 	headers = {'Authorization': f'Bearer {token}'}
 	request = urllib.request.Request(url, headers=headers)
 
 	with urllib.request.urlopen(request) as response:
 		if response.status == 200:
 			content_disposition = response.getheader('Content-Disposition')
 			if content_disposition:
 				filename = content_disposition.split('filename=')[-1].strip('"')
 			else:
 				raise ValueError(f'Failed to get filename from Content-Disposition header: {content_disposition}')
 
 			filepath = os.path.join(output_directory, filename)
 
 			with open(filepath, 'wb') as file:
 				while True:
 					chunk = response.read(1024)
 					if not chunk:
 						break
 					file.write(chunk)
 
 			return filepath
 		else:
 			raise Exception(f'Failed to download {url}: {response.status} {response.reason}')
 
 
 def main(username: str, password: str, concurrency: int):
 	'''
 	Main function to download all zone files.
 
 	:param username: ICANN Username
 	:param password: ICANN Password
 	:param concurrency: Number of concurrent downloads
 	'''
 
 	now = time.strftime('%Y-%m-%d')
 
 	logging.info(f'Authenticating with ICANN API...')
 	try:
 		token = authenticate(username, password)
 	except Exception as e:
 		raise Exception(f'Failed to authenticate with ICANN API: {e}')
 	#logging.info(f'Authenticated with token: {token}')
 	# The above line is commented out to avoid printing the token to the logs, you can uncomment it for debugging purposes
 
 	output_directory = os.path.join(os.getcwd(), 'zones', now)
 	os.makedirs(output_directory, exist_ok=True)
 
 	logging.info('Fetching zone stats report...')
 	try:
 		download_report(token, output_directory, username)
 	except Exception as e:
 		raise Exception(f'Failed to download zone stats report: {e}')
 
 	logging.info('Fetching zone links...')
 	try:
 		zone_links = fetch_zone_links(token)
 	except Exception as e:
 		raise Exception(f'Failed to fetch zone links: {e}')
 	logging.info(f'Fetched {len(zone_links)} zone links')
 
 	with concurrent.futures.ThreadPoolExecutor(max_workers=concurrency) as executor:
 		future_to_url = {executor.submit(download_zone, url, token, output_directory): url for url in zone_links}
 		for future in concurrent.futures.as_completed(future_to_url):
 			url = future_to_url[future]
 			try:
 				filepath = future.result()
 				logging.info(f'Completed downloading {url} to file {filepath}')
 			except Exception as e:
 				logging.error(f'{url} generated an exception: {e}')
 
 
 
 if __name__ == '__main__':
 	parser = argparse.ArgumentParser(description='ICANN API for the Centralized Zones Data Service')
 	parser.add_argument('-u', '--username', help='ICANN Username')
 	parser.add_argument('-p', '--password', help='ICANN Password')
 	parser.add_argument('-c', '--concurrency', type=int, default=3, help='Number of concurrent downloads')
 	args = parser.parse_args()
 
 	username = args.username or os.getenv('CZDS_USER') or input('ICANN Username: ')
 	password = args.password or os.getenv('CZDS_PASS') or getpass.getpass('ICANN Password: ')
 
 	main(username, password, args.concurrency)

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