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+Date: Wed, 24 Feb 2016 09:15:24 -0800\r
+From: "W. Trevor King" <wking@tremily.us>\r
+To: David Bremner <david@tethera.net>\r
+Cc: Daniel Kahn Gillmor <dkg@fifthhorseman.net>, notmuch@notmuchmail.org\r
+Subject: Re: encoding of message-ids\r
+Message-ID: <20160224171524.GS4265@odin.tremily.us>\r
+References: <87si0svnim.fsf@zancas.localnet>\r
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+\r
+On Wed, Feb 17, 2016 at 09:34:29AM -0400, David Bremner wrote:\r
+> Daniel Kahn Gillmor writes:\r
+> > That said, RFC 2047 suggest that its encodings are only relevant\r
+> > in places where a "text" token would be used. Message-ID (and\r
+> > References and In-Reply-To) are intended to only contain\r
+> > dot-atom-text tokens. So probably it would be more correct to\r
+> > avoid applying to these specific fields.\r
+> >\r
+> > i dunno that it's a big deal though, given the analysis above.\r
+>\r
+> I guess there are two seperate issues. One is the (mildly bogus)\r
+> application of RFC2047 decoding to message-ids. The other other is\r
+> the coercion into utf8 from whatever wacky 8bit encoding some\r
+> creative person might use in a message-id.\r
+\r
+It looks like there's already an =E2=80=9Cimplicit encodings are complicate=\r
+d=E2=80=9D\r
+RFC discussing this issue [1]. RFC 6532 overrides (among other\r
+things) the atext behind message-id [2,3] for message/global messages.\r
+Other related RFCs cover internationalized domain names [4] and\r
+internationalized email addresses [5]. I think we should:\r
+\r
+* Store message IDs as NFKC UTF-8 in notmuch (do we already do this?).\r
+* For message/global messages:\r
+ * Convert headers to Unicode using UTF-8 (per RFC 6532).\r
+* For non-message/global messages:\r
+ * Ignore any RFC 2047 =3D? encoding or RFC 5890 xn-- encoding that may\r
+ be present.\r
+ * Convert to Unicode by percent-encoding [6] (e.g. =E2=80=98=C3=BC%=E2=80=\r
+=99 represented\r
+ as the three UTF-8 bytes =E2=80=98\xc3\xbc\x25=E2=80=99 would be repres=\r
+ented by\r
+ the Unicode =E2=80=98%C3%BC%25=E2=80=99).\r
+\r
+Cheers,\r
+Trevor\r
+\r
+[1]: https://tools.ietf.org/html/rfc6055\r
+[2]: https://tools.ietf.org/html/rfc5322#section-3.6.4\r
+[3]: https://tools.ietf.org/html/rfc5322#section-3.2.3\r
+[4]: https://tools.ietf.org/html/rfc5890\r
+[5]: https://tools.ietf.org/html/rfc6530\r
+[6]: https://tools.ietf.org/html/rfc3986#section-2\r
+[7]: https://tools.ietf.org/html/rfc2606#section-2\r
+\r
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projects / notmuch-archives.git / commitdiff