47 lines
1.1 KiB
Python
47 lines
1.1 KiB
Python
import logging
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import os
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import socket
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import ipaddress
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from urllib.parse import urlparse
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from . import strtobool
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from .errors import Error
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logger = logging.getLogger(__name__)
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class InvalidURLError(Error):
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pass
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def is_url_valid(url: str) -> bool:
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parsed = urlparse(url)
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if parsed.scheme not in ['http', 'https']:
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return False
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# XXX in debug mode, we want to allow requests to localhost to test the federation with local instances
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debug_mode = strtobool(os.getenv('MICROBLOGPUB_DEBUG', 'false'))
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if debug_mode:
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return True
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if parsed.hostname in ['localhost']:
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return False
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try:
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ip_address = socket.getaddrinfo(parsed.hostname, parsed.port or 80)[0][4][0]
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except socket.gaierror:
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logger.exception(f'failed to lookup url {url}')
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return False
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if ipaddress.ip_address(ip_address).is_private:
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logger.info(f'rejecting private URL {url}')
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return False
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return True
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def check_url(url: str) -> None:
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if not is_url_valid(url):
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raise InvalidURLError(f'"{url}" is invalid')
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return None
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