Re: Advertising metadata and other fields in overview

Julien ÉLIE wrote:

>
[...]
In case you wish to test a possible use of the Newsgroups field if
present in overview data, I've added it in my news server
(news.trigofacile.com):
 
LIST OVERVIEW.FMT
215 Order of fields in overview database
Subject:
From:
Date:
Message-ID:
References:
:bytes
:lines
Xref:full
Newsgroups:full
Path:full
.
[...]

I have implemented support for LIST OVERVIEW.FMT in the snapshot flnews
1.2.0pre1. According to the comment from Russ, the command is executed
only once per session.

Protocol log:
------------------------------------------------------------------------
[Using NNTP protocol driver]
[=> Connect to news.trigofacile.com:nntps]
[Established encrypted connection using TLSv1.3 protocol with cipher suite TLS_AES_256_GCM_SHA384]
[<= Expect X509 certificate]
Certificate:
[...]
[Server certificate verification successful]
[<=] 200 news.trigofacile.com InterNetNews NNRP server INN 2.8.0 (20220801 prerelease) ready (no posting)
[=>] CAPABILITIES
[<=] 101 Capability list:
[<= Expect multiline data block]
VERSION 2
IMPLEMENTATION INN 2.8.0 (20220801 prerelease)
AUTHINFO USER SASL
COMPRESS DEFLATE
HDR
LIST ACTIVE ACTIVE.TIMES COUNTS DISTRIB.PATS DISTRIBUTIONS HEADERS MODERATORS MOTD NEWSGROUPS OVERVIEW.FMT SUBSCRIPTIONS
OVER
READER
SASL GS2-IAKERB GS2-KRB5 SCRAM-SHA-1 SCRAM-SHA-256 GSS-SPNEGO GSSAPI DIGEST-MD5 OTP NTLM CRAM-MD5 LOGIN PLAIN
XPAT
[Switch to NNTP V2 (RFC 3977) mode]

[Client authentication]
[Compression]

[=>] LIST OVERVIEW.FMT
[<=] 215 Order of fields in overview database
[<= Expect multiline data block]
Subject:
From:
Date:
Message-ID:
References:
:bytes
:lines
Xref:full
Newsgroups:full
Path:full
[Newsgroups header field available from overview]
[...]
------------------------------------------------------------------------

Urs noted that some server implementations are broken.
The mandatory fields are now checked for presence and order.

The Newsgroups header field, if present, is copied from the overview.
Scoring rules of type "group" are applied to all groups in this case.