mirror of
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111 lines
2.9 KiB
Python
111 lines
2.9 KiB
Python
import six
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from six.moves import urllib
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from netlib import utils
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# PY2 workaround
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def decode_parse_result(result, enc):
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if hasattr(result, "decode"):
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return result.decode(enc)
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else:
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return urllib.parse.ParseResult(*[x.decode(enc) for x in result])
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# PY2 workaround
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def encode_parse_result(result, enc):
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if hasattr(result, "encode"):
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return result.encode(enc)
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else:
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return urllib.parse.ParseResult(*[x.encode(enc) for x in result])
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def parse(url):
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"""
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URL-parsing function that checks that
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- port is an integer 0-65535
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- host is a valid IDNA-encoded hostname with no null-bytes
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- path is valid ASCII
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Args:
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A URL (as bytes or as unicode)
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Returns:
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A (scheme, host, port, path) tuple
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Raises:
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ValueError, if the URL is not properly formatted.
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"""
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parsed = urllib.parse.urlparse(url)
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if not parsed.hostname:
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raise ValueError("No hostname given")
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if isinstance(url, six.binary_type):
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host = parsed.hostname
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# this should not raise a ValueError,
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# but we try to be very forgiving here and accept just everything.
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# decode_parse_result(parsed, "ascii")
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else:
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host = parsed.hostname.encode("idna")
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parsed = encode_parse_result(parsed, "ascii")
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port = parsed.port
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if not port:
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port = 443 if parsed.scheme == b"https" else 80
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full_path = urllib.parse.urlunparse(
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(b"", b"", parsed.path, parsed.params, parsed.query, parsed.fragment)
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)
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if not full_path.startswith(b"/"):
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full_path = b"/" + full_path
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if not utils.is_valid_host(host):
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raise ValueError("Invalid Host")
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if not utils.is_valid_port(port):
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raise ValueError("Invalid Port")
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return parsed.scheme, host, port, full_path
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def unparse(scheme, host, port, path=""):
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"""
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Returns a URL string, constructed from the specified components.
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Args:
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All args must be str.
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"""
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if path == "*":
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path = ""
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return "%s://%s%s" % (scheme, hostport(scheme, host, port), path)
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def encode(s):
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# type: (six.text_type, bytes) -> str
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"""
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Takes a list of (key, value) tuples and returns a urlencoded string.
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"""
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s = [tuple(i) for i in s]
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return urllib.parse.urlencode(s, False)
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def decode(s):
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"""
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Takes a urlencoded string and returns a list of (key, value) tuples.
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"""
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return urllib.parse.parse_qsl(s, keep_blank_values=True)
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def hostport(scheme, host, port):
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"""
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Returns the host component, with a port specifcation if needed.
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"""
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if (port, scheme) in [(80, "http"), (443, "https"), (80, b"http"), (443, b"https")]:
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return host
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else:
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if isinstance(host, six.binary_type):
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return b"%s:%d" % (host, port)
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else:
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return "%s:%d" % (host, port)
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