Hi all,
I've joined virtually the Opportunity Open Source conference at IIT
Mandi, India, where we as OpenPrinting held track about the recent
events in our group.
Brief summary:
- current CUPS 2.4.x works with classic drivers and printer
applications, as whole 2.x series will
- Till works on finishing common-print-dialog-backends into Ubuntu, so
GTK4 applications can use unified print dialog with the latest features
- CUPS 2.5 is held until we have OAuth support (aimed at the end of this
year)
- I will be releasing 2.4.x until CUPS 2.5 gold release - soon there
will be 2.4.7 with several bug fixes.
- looking for help with desktop integration and feature implementation
Complete notes are attached.
Zdenek
--
Zdenek Dohnal
Senior Software Engineer
Red Hat, BRQ-TPBC
Opportunity open source
========================
- now we work with printer apps and classic drivers - classic drivers will be
removed in CUPS 3
- 2.4 Zdenek Dohnal released manager, 2.5 Till Kamppeter - delayed for OAuth
- 2.5:
- getting rid of some deprecated functions (windows sspi tls implementation
switched for LibreSSL)
- new requirements - C99 standrad, DNS-SD (Avahi/mDNSResponder), TLS (Gnutls,
LibreSSL), ZLIB, POSIX/Win threading
- for discovery:
- wide-area DNS-SD for Avahi needs to implemented
- config profiles needs to be implemented
- localization improvements
- OAuth/OpenID - lot of desktop work - API, UI
- job-sheets-col - (I want to print certain banner onto specific media -
classified banner on blue paper)
- backporting CUPS 3 things:
- better media-col suppport - cups_media_t
- HTML/Rest/JSON/JWT apis
- IPP file API (file of IPP attributes which you can use for printer
configuration)
- profiles - directory with file with plain text files of printers which want
to see (~/.cups, ~/.config, /etc/cups/profiles)
- directives - Server/ServerName/Printer, filtering options (by location
name, geo location, type)
- OAuth/OpenID - replacement for kerberos, because it does not uphold
security standards and win moves away from it
- OAuth does not need root to access the ticket or user changing
- 2.5 with OAuth and Kerberos, CUPS 3.0 removes Kerberos
- OpenID needed JSON and JWT
- basically adding support for RFC 8414/OpenID
- we need to cache bearer and refresh tokens per user/auth-server in cupsd
once this is implemented
- once we have this we need Authorization UI and CLI tool for authentication
- CUPS 3.0
- Mike Sweet release manager
- libcups is now in the first beta, cups-sharing, cups-local in next year
- cups-commands will be split into cups-local and cups-sharing
- modular CUPS - library and two type of daemons - sharing, local
- modules:
- libcups:
- ippeverinter, ippevepcl, ippeveps, ippfind, ipptool, ipptransform (for
transformations, use in ippeveprinter), libcups (see changes in MIGRATING.md)
- removed deprecated APIs - bumped SONAME
- local:
- cancel, lp, lpq, lpr, lpstat, cups-locald
- temporary queues+profiles
- runs as user
- CUPS 2.x UNIX domain socket, DBUS API, XPC API
- barely started
- handling auth and notif UI
- no web interface
- job history for current login
- convertion to/grom PDF/raster as printer wants
- sharing:
- cupsaccept, cupsdisable, cupsenable, cupsreject, lpadmin, cups-sharingd
- for SecurePrint, load balancing, OAuth, ACLs, print accounting
- config similar to current cupsd
- only network sockets
- web interface, printers, jobs
- challenges - broader scope - lot of work on UI - uplifting GNOME/KDE/XFCE for
new D-BUS API for printing auth, consent UI - common-print-dialog-backends
- hopefully we can reuse some of PAPPL, reuse of authorization/notification
UI from somewhere
- bad Ghostscript license complicates PDF conversions with using its API (so
we still need call it as binary) - maybe PDFium from Chrome can fix this
Desktop integration of the new architecture
===========================================
- common print dialog backends now have support in GTK4, working on QT, Firefox
- for non-gnome desktop - update system-config-printer or get printer module
from gnome-control-center and make it generic for all desktops (from current
Gnome Control Center, GNOME is going to move to a new
library which is not compatible with non-Gnome desktops)
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