mirror of https://github.com/morpheus65535/bazarr
76 lines
2.5 KiB
Python
76 lines
2.5 KiB
Python
"""
|
|
This contains a bunch of RFC7230 definitions and regular expressions that are
|
|
needed to properly parse HTTP messages.
|
|
"""
|
|
|
|
import re
|
|
|
|
HEXDIG = "[0-9a-fA-F]"
|
|
DIGIT = "[0-9]"
|
|
|
|
WS = "[ \t]"
|
|
OWS = WS + "{0,}?"
|
|
RWS = WS + "{1,}?"
|
|
BWS = OWS
|
|
|
|
# RFC 7230 Section 3.2.6 "Field Value Components":
|
|
# tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*"
|
|
# / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
|
|
# / DIGIT / ALPHA
|
|
# obs-text = %x80-FF
|
|
TCHAR = r"[!#$%&'*+\-.^_`|~0-9A-Za-z]"
|
|
OBS_TEXT = r"\x80-\xff"
|
|
|
|
TOKEN = TCHAR + "{1,}"
|
|
|
|
# RFC 5234 Appendix B.1 "Core Rules":
|
|
# VCHAR = %x21-7E
|
|
# ; visible (printing) characters
|
|
VCHAR = r"\x21-\x7e"
|
|
|
|
# The '\\' between \x5b and \x5d is needed to escape \x5d (']')
|
|
QDTEXT = "[\t \x21\x23-\x5b\\\x5d-\x7e" + OBS_TEXT + "]"
|
|
|
|
QUOTED_PAIR = r"\\" + "([\t " + VCHAR + OBS_TEXT + "])"
|
|
QUOTED_STRING = '"(?:(?:' + QDTEXT + ")|(?:" + QUOTED_PAIR + '))*"'
|
|
|
|
# header-field = field-name ":" OWS field-value OWS
|
|
# field-name = token
|
|
# field-value = *( field-content / obs-fold )
|
|
# field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
|
|
# field-vchar = VCHAR / obs-text
|
|
|
|
# Errata from: https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4189
|
|
# changes field-content to:
|
|
#
|
|
# field-content = field-vchar [ 1*( SP / HTAB / field-vchar )
|
|
# field-vchar ]
|
|
|
|
FIELD_VCHAR = "[" + VCHAR + OBS_TEXT + "]"
|
|
# Field content is more greedy than the ABNF, in that it will match the whole value
|
|
FIELD_CONTENT = FIELD_VCHAR + "+(?:[ \t]+" + FIELD_VCHAR + "+)*"
|
|
# Which allows the field value here to just see if there is even a value in the first place
|
|
FIELD_VALUE = "(?:" + FIELD_CONTENT + ")?"
|
|
|
|
# chunk-ext = *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
|
|
# chunk-ext-name = token
|
|
# chunk-ext-val = token / quoted-string
|
|
|
|
CHUNK_EXT_NAME = TOKEN
|
|
CHUNK_EXT_VAL = "(?:" + TOKEN + ")|(?:" + QUOTED_STRING + ")"
|
|
CHUNK_EXT = (
|
|
"(?:;(?P<extension>" + CHUNK_EXT_NAME + ")(?:=(?P<value>" + CHUNK_EXT_VAL + "))?)*"
|
|
)
|
|
|
|
# Pre-compiled regular expressions for use elsewhere
|
|
ONLY_HEXDIG_RE = re.compile(("^" + HEXDIG + "+$").encode("latin-1"))
|
|
ONLY_DIGIT_RE = re.compile(("^" + DIGIT + "+$").encode("latin-1"))
|
|
HEADER_FIELD_RE = re.compile(
|
|
(
|
|
"^(?P<name>" + TOKEN + "):" + OWS + "(?P<value>" + FIELD_VALUE + ")" + OWS + "$"
|
|
).encode("latin-1")
|
|
)
|
|
QUOTED_PAIR_RE = re.compile(QUOTED_PAIR)
|
|
QUOTED_STRING_RE = re.compile(QUOTED_STRING)
|
|
CHUNK_EXT_RE = re.compile(("^" + CHUNK_EXT + "$").encode("latin-1"))
|