** Description changed: Currently, we define the X-Message-ID-Hash as the base32 encoding of the sha1 hash of the Message-ID content (sans angle brackets as defined in RFC 5322). The suggestion is made that List-ID value should be added to this hash so as to be able to distinguish cross-posted messages. This should be fine, and pretty easy. My only concern is that the - header name is now a misnomer. + header name is now a misnomer. I'm suggesting we change this to + Permalink-Hash. - I wonder, is it worth coming up with a better header? Now's the time to - do it since it's likely that there are almost no consumers of this - standard. + Here is the proposed algorithm for calculating the Permalink-Hash - What about `Permalink-Hash` ? + >>> bare_msgid = msg['Message-ID'][1:-1] # remove the angle brackets + >>> h = sha1(bare_msgid) + >>> list_id = msg['List-ID'][1:-1] # remove angle brackets + >>> h.update(list_id) + >>> permalink_hash = b32encode(h.digest()) + >>> msg.add_header('Permalink-Hash', permalink_hash, version='1') + + Notes: + - If the Message-ID or List-ID values do not both start and end with angle brackets, the entire header value should be used (i.e. only strip off bytes 0 and -1 if they are angle brackets) + - The Permalink-Hash header gets a "version=1" parameter to indicate the version of this spec the header conforms to. + - RFC 5064 defines the Archived-At header, which mm3 already supports. It is suggested that this header would use the permalink hash as the URI directly to this message in the specified archive. + - Some people suggest that the List-ID be explicit in the Permalink-Hash value. I would reject this on the grounds that the value should be opaque. If this information is needed, it should be added to the Archived-At header. -- You received this bug notification because you are a member of Mailman Coders, which is subscribed to GNU Mailman. https://bugs.launchpad.net/bugs/985149 Title: Permalink-Hash: header specification To manage notifications about this bug go to: https://bugs.launchpad.net/mailman/+bug/985149/+subscriptions