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51 lines
1.5 KiB
51 lines
1.5 KiB
3 years ago
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"""
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This contains a bunch of RFC7230 definitions and regular expressions that are
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needed to properly parse HTTP messages.
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"""
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import re
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WS = "[ \t]"
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OWS = WS + "{0,}?"
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RWS = WS + "{1,}?"
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BWS = OWS
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# RFC 7230 Section 3.2.6 "Field Value Components":
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# tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*"
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# / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
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# / DIGIT / ALPHA
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# obs-text = %x80-FF
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TCHAR = r"[!#$%&'*+\-.^_`|~0-9A-Za-z]"
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OBS_TEXT = r"\x80-\xff"
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TOKEN = TCHAR + "{1,}"
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# RFC 5234 Appendix B.1 "Core Rules":
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# VCHAR = %x21-7E
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# ; visible (printing) characters
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VCHAR = r"\x21-\x7e"
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# header-field = field-name ":" OWS field-value OWS
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# field-name = token
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# field-value = *( field-content / obs-fold )
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# field-content = field-vchar [ 1*( SP / HTAB ) field-vchar ]
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# field-vchar = VCHAR / obs-text
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# Errata from: https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4189
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# changes field-content to:
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#
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# field-content = field-vchar [ 1*( SP / HTAB / field-vchar )
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# field-vchar ]
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FIELD_VCHAR = "[" + VCHAR + OBS_TEXT + "]"
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# Field content is more greedy than the ABNF, in that it will match the whole value
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FIELD_CONTENT = FIELD_VCHAR + "+(?:[ \t]+" + FIELD_VCHAR + "+)*"
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# Which allows the field value here to just see if there is even a value in the first place
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FIELD_VALUE = "(?:" + FIELD_CONTENT + ")?"
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HEADER_FIELD = re.compile(
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(
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"^(?P<name>" + TOKEN + "):" + OWS + "(?P<value>" + FIELD_VALUE + ")" + OWS + "$"
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).encode("latin-1")
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)
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