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305 lines
11 KiB
305 lines
11 KiB
1 week ago
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# Copyright Joyent, Inc. and other Node contributors.
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#
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# Permission is hereby granted, free of charge, to any person obtaining a
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# copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to permit
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# persons to whom the Software is furnished to do so, subject to the
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# following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
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# NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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# USE OR OTHER DEALINGS IN THE SOFTWARE.
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# Changes from joyent/node:
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#
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# 1. No leading slash in paths,
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# e.g. in `url.parse('http://foo?bar')` pathname is ``, not `/`
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#
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# 2. Backslashes are not replaced with slashes,
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# so `http:\\example.org\` is treated like a relative path
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#
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# 3. Trailing colon is treated like a part of the path,
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# i.e. in `http://example.org:foo` pathname is `:foo`
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#
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# 4. Nothing is URL-encoded in the resulting object,
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# (in joyent/node some chars in auth and paths are encoded)
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#
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# 5. `url.parse()` does not have `parseQueryString` argument
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#
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# 6. Removed extraneous result properties: `host`, `path`, `query`, etc.,
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# which can be constructed using other parts of the url.
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from __future__ import annotations
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from collections import defaultdict
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import re
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from mdurl._url import URL
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# Reference: RFC 3986, RFC 1808, RFC 2396
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# define these here so at least they only have to be
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# compiled once on the first module load.
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PROTOCOL_PATTERN = re.compile(r"^([a-z0-9.+-]+:)", flags=re.IGNORECASE)
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PORT_PATTERN = re.compile(r":[0-9]*$")
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# Special case for a simple path URL
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SIMPLE_PATH_PATTERN = re.compile(r"^(//?(?!/)[^?\s]*)(\?[^\s]*)?$")
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# RFC 2396: characters reserved for delimiting URLs.
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# We actually just auto-escape these.
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DELIMS = ("<", ">", '"', "`", " ", "\r", "\n", "\t")
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# RFC 2396: characters not allowed for various reasons.
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UNWISE = ("{", "}", "|", "\\", "^", "`") + DELIMS
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# Allowed by RFCs, but cause of XSS attacks. Always escape these.
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AUTO_ESCAPE = ("'",) + UNWISE
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# Characters that are never ever allowed in a hostname.
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# Note that any invalid chars are also handled, but these
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# are the ones that are *expected* to be seen, so we fast-path
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# them.
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NON_HOST_CHARS = ("%", "/", "?", ";", "#") + AUTO_ESCAPE
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HOST_ENDING_CHARS = ("/", "?", "#")
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HOSTNAME_MAX_LEN = 255
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HOSTNAME_PART_PATTERN = re.compile(r"^[+a-z0-9A-Z_-]{0,63}$")
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HOSTNAME_PART_START = re.compile(r"^([+a-z0-9A-Z_-]{0,63})(.*)$")
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# protocols that can allow "unsafe" and "unwise" chars.
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# protocols that never have a hostname.
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HOSTLESS_PROTOCOL = defaultdict(
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bool,
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{
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"javascript": True,
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"javascript:": True,
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},
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)
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# protocols that always contain a // bit.
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SLASHED_PROTOCOL = defaultdict(
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bool,
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{
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"http": True,
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"https": True,
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"ftp": True,
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"gopher": True,
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"file": True,
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"http:": True,
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"https:": True,
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"ftp:": True,
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"gopher:": True,
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"file:": True,
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},
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)
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class MutableURL:
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def __init__(self) -> None:
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self.protocol: str | None = None
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self.slashes: bool = False
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self.auth: str | None = None
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self.port: str | None = None
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self.hostname: str | None = None
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self.hash: str | None = None
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self.search: str | None = None
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self.pathname: str | None = None
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def parse(self, url: str, slashes_denote_host: bool) -> "MutableURL":
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lower_proto = ""
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slashes = False
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rest = url
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# trim before proceeding.
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# This is to support parse stuff like " http://foo.com \n"
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rest = rest.strip()
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if not slashes_denote_host and len(url.split("#")) == 1:
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# Try fast path regexp
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simple_path = SIMPLE_PATH_PATTERN.match(rest)
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if simple_path:
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self.pathname = simple_path.group(1)
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if simple_path.group(2):
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self.search = simple_path.group(2)
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return self
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proto = ""
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proto_match = PROTOCOL_PATTERN.match(rest)
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if proto_match:
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proto = proto_match.group()
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lower_proto = proto.lower()
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self.protocol = proto
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rest = rest[len(proto) :]
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# figure out if it's got a host
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# user@server is *always* interpreted as a hostname, and url
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# resolution will treat //foo/bar as host=foo,path=bar because that's
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# how the browser resolves relative URLs.
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if slashes_denote_host or proto or re.search(r"^//[^@/]+@[^@/]+", rest):
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slashes = rest.startswith("//")
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if slashes and not (proto and HOSTLESS_PROTOCOL[proto]):
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rest = rest[2:]
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self.slashes = True
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if not HOSTLESS_PROTOCOL[proto] and (
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slashes or (proto and not SLASHED_PROTOCOL[proto])
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):
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# there's a hostname.
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# the first instance of /, ?, ;, or # ends the host.
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#
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# If there is an @ in the hostname, then non-host chars *are* allowed
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# to the left of the last @ sign, unless some host-ending character
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# comes *before* the @-sign.
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# URLs are obnoxious.
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#
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# ex:
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# http://a@b@c/ => user:a@b host:c
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# http://a@b?@c => user:a host:c path:/?@c
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# v0.12 TODO(isaacs): This is not quite how Chrome does things.
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# Review our test case against browsers more comprehensively.
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# find the first instance of any hostEndingChars
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host_end = -1
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for i in range(len(HOST_ENDING_CHARS)):
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hec = rest.find(HOST_ENDING_CHARS[i])
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if hec != -1 and (host_end == -1 or hec < host_end):
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host_end = hec
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# at this point, either we have an explicit point where the
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# auth portion cannot go past, or the last @ char is the decider.
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if host_end == -1:
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# atSign can be anywhere.
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at_sign = rest.rfind("@")
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else:
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# atSign must be in auth portion.
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# http://a@b/c@d => host:b auth:a path:/c@d
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at_sign = rest.rfind("@", 0, host_end + 1)
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# Now we have a portion which is definitely the auth.
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# Pull that off.
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if at_sign != -1:
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auth = rest[:at_sign]
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rest = rest[at_sign + 1 :]
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self.auth = auth
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# the host is the remaining to the left of the first non-host char
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host_end = -1
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for i in range(len(NON_HOST_CHARS)):
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hec = rest.find(NON_HOST_CHARS[i])
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if hec != -1 and (host_end == -1 or hec < host_end):
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host_end = hec
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# if we still have not hit it, then the entire thing is a host.
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if host_end == -1:
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host_end = len(rest)
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if host_end > 0 and rest[host_end - 1] == ":":
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host_end -= 1
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host = rest[:host_end]
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rest = rest[host_end:]
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# pull out port.
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self.parse_host(host)
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# we've indicated that there is a hostname,
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# so even if it's empty, it has to be present.
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self.hostname = self.hostname or ""
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# if hostname begins with [ and ends with ]
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# assume that it's an IPv6 address.
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ipv6_hostname = self.hostname.startswith("[") and self.hostname.endswith(
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"]"
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)
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# validate a little.
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if not ipv6_hostname:
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hostparts = self.hostname.split(".")
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l = len(hostparts) # noqa: E741
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i = 0
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while i < l:
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part = hostparts[i]
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if not part:
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i += 1 # emulate statement3 in JS for loop
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continue
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if not HOSTNAME_PART_PATTERN.search(part):
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newpart = ""
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k = len(part)
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j = 0
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while j < k:
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if ord(part[j]) > 127:
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# we replace non-ASCII char with a temporary placeholder
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# we need this to make sure size of hostname is not
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# broken by replacing non-ASCII by nothing
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newpart += "x"
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else:
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newpart += part[j]
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j += 1 # emulate statement3 in JS for loop
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# we test again with ASCII char only
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if not HOSTNAME_PART_PATTERN.search(newpart):
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valid_parts = hostparts[:i]
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not_host = hostparts[i + 1 :]
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bit = HOSTNAME_PART_START.search(part)
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if bit:
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valid_parts.append(bit.group(1))
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not_host.insert(0, bit.group(2))
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if not_host:
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rest = ".".join(not_host) + rest
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self.hostname = ".".join(valid_parts)
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break
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i += 1 # emulate statement3 in JS for loop
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if len(self.hostname) > HOSTNAME_MAX_LEN:
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self.hostname = ""
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# strip [ and ] from the hostname
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# the host field still retains them, though
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if ipv6_hostname:
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self.hostname = self.hostname[1:-1]
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# chop off from the tail first.
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hash = rest.find("#") # noqa: A001
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if hash != -1:
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# got a fragment string.
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self.hash = rest[hash:]
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rest = rest[:hash]
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qm = rest.find("?")
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if qm != -1:
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self.search = rest[qm:]
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rest = rest[:qm]
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if rest:
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self.pathname = rest
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if SLASHED_PROTOCOL[lower_proto] and self.hostname and not self.pathname:
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self.pathname = ""
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return self
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def parse_host(self, host: str) -> None:
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port_match = PORT_PATTERN.search(host)
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if port_match:
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port = port_match.group()
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if port != ":":
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self.port = port[1:]
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host = host[: -len(port)]
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if host:
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self.hostname = host
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def url_parse(url: URL | str, *, slashes_denote_host: bool = False) -> URL:
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if isinstance(url, URL):
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return url
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u = MutableURL()
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u.parse(url, slashes_denote_host)
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return URL(
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u.protocol, u.slashes, u.auth, u.port, u.hostname, u.hash, u.search, u.pathname
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)
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