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MAS-WP-0005-T02: SCP-1 quoted local-parts equivalent on receipt

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 252470@bnt-lap001
Assistant-Session: ad628c8f-4be2-4979-94c9-76c7ed6f8241
This commit is contained in:
tegwick 2026-10-18 18:16:59 +02:00
parent 5b57a9941e
commit 0a2d811444
9 changed files with 70 additions and 6 deletions
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19
mas_core/parser.py
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@ -141,6 +141,25 @@ def parse_address(value: str) -> ParsedAddress:
return ParsedAddress(local=parse_local_part(local), domain=domain)
def unquote_local_part(local: str) -> str:
"""Drop quotes a receiver cannot distinguish (v0.1.1, SCP-1).
`"ticket=PR42"` is not canonical, but RFC 5321 treats it as equivalent to
`ticket=PR42` and MTAs strip such quotes, so receivers must too. Quoted
content with quoted-pairs or inner quotes is left alone and stays
non-canonical.
"""
if len(local) >= 2 and local[0] == local[-1] == '"' and not any(c in '"\\' for c in local[1:-1]):
return local[1:-1]
return local
def parse_received_address(value: str) -> ParsedAddress:
"""Parse a recipient as a receiver sees it: unnecessary quotes removed."""
local, domain = split_address(value)
return ParsedAddress(local=parse_local_part(unquote_local_part(local)), domain=domain)
@dataclass(frozen=True)
class ValidationResult:
ok: bool