Microsoft access tokens have a ~1 hour TTL. The launcher cached the
MSession once at sign-in and re-used it on every Play click, so leaving
the launcher open for >1 hour and then hitting Play sent stale
credentials to MC -- Mojang's session check on the server then rejected
the join with "Invalid session".
Fix: in DoLaunchAsync, before assembling the MC launch command, call
_auth.TryAuthenticateSilentlyAsync(). XboxAuthNet's silent flow uses
the cached refresh token (~14 day TTL) to mint a fresh access token
transparently. On success ApplySession swaps in the new MSession and
we launch with valid credentials. On failure (refresh token also
stale) the launcher prompts the player to sign in again -- they keep
the launcher open, hit Sign In, no MC restart needed.
No new dependencies, no UI change beyond the brief "Refreshing
session..." status line, no perf cost beyond the ~500ms HTTP roundtrip
to Microsoft each launch.
Bump the launcher version in launcher/ModpackLauncher.csproj before
publishing so old launcher installs see the upgrade banner.
Adds Services/SelfUpdateService.cs implementing the Chrome-style pattern:
1. Download new exe to "<current>.new"
2. Rename running exe to "<current>.old" (NTFS allows MoveFile on a
running exe -- it resolves processes by handle, not by path)
3. Rename ".new" to canonical path
4. Spawn the new exe with our argv
5. Environment.Exit(0)
6. Next start of the new exe runs CleanupAfterUpdate() in App.OFIC()
which deletes the leftover ".old"
UI: the existing "Download" banner button is now "Install update". Click
runs the self-update flow with a percent/MB progress label; any failure
(network, AV write-block, dir not writable) falls back to opening the
URL in the browser so users always have a path forward.
Bumps to 0.4.7. Also fixes a stale fallback URL that pointed at
sijbers.uk/pack/... -- now correctly points at bns.sijbers.uk/launcher/.
Matt
Matt Sijbers