Current File : //usr/lib/python3/dist-packages/mdurl/_parse.py
# Copyright Joyent, Inc. and other Node contributors.
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to permit
# persons to whom the Software is furnished to do so, subject to the
# following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
# NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
# USE OR OTHER DEALINGS IN THE SOFTWARE.
# Changes from joyent/node:
#
# 1. No leading slash in paths,
# e.g. in `url.parse('http://foo?bar')` pathname is ``, not `/`
#
# 2. Backslashes are not replaced with slashes,
# so `http:\\example.org\` is treated like a relative path
#
# 3. Trailing colon is treated like a part of the path,
# i.e. in `http://example.org:foo` pathname is `:foo`
#
# 4. Nothing is URL-encoded in the resulting object,
# (in joyent/node some chars in auth and paths are encoded)
#
# 5. `url.parse()` does not have `parseQueryString` argument
#
# 6. Removed extraneous result properties: `host`, `path`, `query`, etc.,
# which can be constructed using other parts of the url.
from __future__ import annotations
from collections import defaultdict
import re
from mdurl._url import URL
# Reference: RFC 3986, RFC 1808, RFC 2396
# define these here so at least they only have to be
# compiled once on the first module load.
PROTOCOL_PATTERN = re.compile(r"^([a-z0-9.+-]+:)", flags=re.IGNORECASE)
PORT_PATTERN = re.compile(r":[0-9]*$")
# Special case for a simple path URL
SIMPLE_PATH_PATTERN = re.compile(r"^(//?(?!/)[^?\s]*)(\?[^\s]*)?$")
# RFC 2396: characters reserved for delimiting URLs.
# We actually just auto-escape these.
DELIMS = ("<", ">", '"', "`", " ", "\r", "\n", "\t")
# RFC 2396: characters not allowed for various reasons.
UNWISE = ("{", "}", "|", "\\", "^", "`") + DELIMS
# Allowed by RFCs, but cause of XSS attacks. Always escape these.
AUTO_ESCAPE = ("'",) + UNWISE
# Characters that are never ever allowed in a hostname.
# Note that any invalid chars are also handled, but these
# are the ones that are *expected* to be seen, so we fast-path
# them.
NON_HOST_CHARS = ("%", "/", "?", ";", "#") + AUTO_ESCAPE
HOST_ENDING_CHARS = ("/", "?", "#")
HOSTNAME_MAX_LEN = 255
HOSTNAME_PART_PATTERN = re.compile(r"^[+a-z0-9A-Z_-]{0,63}$")
HOSTNAME_PART_START = re.compile(r"^([+a-z0-9A-Z_-]{0,63})(.*)$")
# protocols that can allow "unsafe" and "unwise" chars.
# protocols that never have a hostname.
HOSTLESS_PROTOCOL = defaultdict(
bool,
{
"javascript": True,
"javascript:": True,
},
)
# protocols that always contain a // bit.
SLASHED_PROTOCOL = defaultdict(
bool,
{
"http": True,
"https": True,
"ftp": True,
"gopher": True,
"file": True,
"http:": True,
"https:": True,
"ftp:": True,
"gopher:": True,
"file:": True,
},
)
class MutableURL:
def __init__(self) -> None:
self.protocol: str | None = None
self.slashes: bool = False
self.auth: str | None = None
self.port: str | None = None
self.hostname: str | None = None
self.hash: str | None = None
self.search: str | None = None
self.pathname: str | None = None
def parse(self, url: str, slashes_denote_host: bool) -> "MutableURL":
lower_proto = ""
slashes = False
rest = url
# trim before proceeding.
# This is to support parse stuff like " http://foo.com \n"
rest = rest.strip()
if not slashes_denote_host and len(url.split("#")) == 1:
# Try fast path regexp
simple_path = SIMPLE_PATH_PATTERN.match(rest)
if simple_path:
self.pathname = simple_path.group(1)
if simple_path.group(2):
self.search = simple_path.group(2)
return self
proto = ""
proto_match = PROTOCOL_PATTERN.match(rest)
if proto_match:
proto = proto_match.group()
lower_proto = proto.lower()
self.protocol = proto
rest = rest[len(proto) :]
# figure out if it's got a host
# user@server is *always* interpreted as a hostname, and url
# resolution will treat //foo/bar as host=foo,path=bar because that's
# how the browser resolves relative URLs.
if slashes_denote_host or proto or re.search(r"^//[^@/]+@[^@/]+", rest):
slashes = rest.startswith("//")
if slashes and not (proto and HOSTLESS_PROTOCOL[proto]):
rest = rest[2:]
self.slashes = True
if not HOSTLESS_PROTOCOL[proto] and (
slashes or (proto and not SLASHED_PROTOCOL[proto])
):
# there's a hostname.
# the first instance of /, ?, ;, or # ends the host.
#
# If there is an @ in the hostname, then non-host chars *are* allowed
# to the left of the last @ sign, unless some host-ending character
# comes *before* the @-sign.
# URLs are obnoxious.
#
# ex:
# http://a@b@c/ => user:a@b host:c
# http://a@b?@c => user:a host:c path:/?@c
# v0.12 TODO(isaacs): This is not quite how Chrome does things.
# Review our test case against browsers more comprehensively.
# find the first instance of any hostEndingChars
host_end = -1
for i in range(len(HOST_ENDING_CHARS)):
hec = rest.find(HOST_ENDING_CHARS[i])
if hec != -1 and (host_end == -1 or hec < host_end):
host_end = hec
# at this point, either we have an explicit point where the
# auth portion cannot go past, or the last @ char is the decider.
if host_end == -1:
# atSign can be anywhere.
at_sign = rest.rfind("@")
else:
# atSign must be in auth portion.
# http://a@b/c@d => host:b auth:a path:/c@d
at_sign = rest.rfind("@", 0, host_end + 1)
# Now we have a portion which is definitely the auth.
# Pull that off.
if at_sign != -1:
auth = rest[:at_sign]
rest = rest[at_sign + 1 :]
self.auth = auth
# the host is the remaining to the left of the first non-host char
host_end = -1
for i in range(len(NON_HOST_CHARS)):
hec = rest.find(NON_HOST_CHARS[i])
if hec != -1 and (host_end == -1 or hec < host_end):
host_end = hec
# if we still have not hit it, then the entire thing is a host.
if host_end == -1:
host_end = len(rest)
if host_end > 0 and rest[host_end - 1] == ":":
host_end -= 1
host = rest[:host_end]
rest = rest[host_end:]
# pull out port.
self.parse_host(host)
# we've indicated that there is a hostname,
# so even if it's empty, it has to be present.
self.hostname = self.hostname or ""
# if hostname begins with [ and ends with ]
# assume that it's an IPv6 address.
ipv6_hostname = self.hostname.startswith("[") and self.hostname.endswith(
"]"
)
# validate a little.
if not ipv6_hostname:
hostparts = self.hostname.split(".")
l = len(hostparts) # noqa: E741
i = 0
while i < l:
part = hostparts[i]
if not part:
i += 1 # emulate statement3 in JS for loop
continue
if not HOSTNAME_PART_PATTERN.search(part):
newpart = ""
k = len(part)
j = 0
while j < k:
if ord(part[j]) > 127:
# we replace non-ASCII char with a temporary placeholder
# we need this to make sure size of hostname is not
# broken by replacing non-ASCII by nothing
newpart += "x"
else:
newpart += part[j]
j += 1 # emulate statement3 in JS for loop
# we test again with ASCII char only
if not HOSTNAME_PART_PATTERN.search(newpart):
valid_parts = hostparts[:i]
not_host = hostparts[i + 1 :]
bit = HOSTNAME_PART_START.search(part)
if bit:
valid_parts.append(bit.group(1))
not_host.insert(0, bit.group(2))
if not_host:
rest = ".".join(not_host) + rest
self.hostname = ".".join(valid_parts)
break
i += 1 # emulate statement3 in JS for loop
if len(self.hostname) > HOSTNAME_MAX_LEN:
self.hostname = ""
# strip [ and ] from the hostname
# the host field still retains them, though
if ipv6_hostname:
self.hostname = self.hostname[1:-1]
# chop off from the tail first.
hash = rest.find("#") # noqa: A001
if hash != -1:
# got a fragment string.
self.hash = rest[hash:]
rest = rest[:hash]
qm = rest.find("?")
if qm != -1:
self.search = rest[qm:]
rest = rest[:qm]
if rest:
self.pathname = rest
if SLASHED_PROTOCOL[lower_proto] and self.hostname and not self.pathname:
self.pathname = ""
return self
def parse_host(self, host: str) -> None:
port_match = PORT_PATTERN.search(host)
if port_match:
port = port_match.group()
if port != ":":
self.port = port[1:]
host = host[: -len(port)]
if host:
self.hostname = host
def url_parse(url: URL | str, *, slashes_denote_host: bool = False) -> URL:
if isinstance(url, URL):
return url
u = MutableURL()
u.parse(url, slashes_denote_host)
return URL(
u.protocol, u.slashes, u.auth, u.port, u.hostname, u.hash, u.search, u.pathname
)
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