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imapserver: implement PREVIEW extension (RFC 8970), and store previews in message database

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We were already generating previews of plain text parts for the webmail
interface, but we didn't store them, so were generating the previews each time
messages were listed.

Now we store previews in the database for faster handling. And we also generate
previews for html parts if needed. We use the first part that has textual
content.

For IMAP, the previews can be requested by an IMAP client. When we get the
"LAZY" variant, which doesn't require us to generate a preview, we generate it
anyway, because it should be fast enough. So don't make clients first ask for
"PREVIEW (LAZY)" and then again a request for "PREVIEW".

We now also generate a preview when a message is added to the account. Except
for imports. It would slow us down, the previews aren't urgent, and they will
be generated on-demand at first-request.
This commit is contained in:
Mechiel Lukkien
2025-03-28 16:57:44 +01:00
parent 8b418a9ca2
commit aa631c604c
23 changed files with 735 additions and 187 deletions
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rfc/index.txt
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@ -234,7 +234,7 @@ https://www.iana.org/assignments/message-headers/message-headers.xhtml
8474 Roadmap - IMAP Extension for Object Identifiers
8508 Yes - IMAP REPLACE Extension
8514 Yes - Internet Message Access Protocol (IMAP) - SAVEDATE Extension
8970 Roadmap - IMAP4 Extension: Message Preview Generation
8970 Yes - IMAP4 Extension: Message Preview Generation
9208 Partial - IMAP QUOTA Extension
9394 Roadmap - IMAP PARTIAL Extension for Paged SEARCH and FETCH
9585 ? - IMAP Response Code for Command Progress Notifications