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Add appservice auth mode behind AUTH_MODE; land device grant

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Two things, entangled in the working tree because 20d1f92 was mislabeled
(its message claimed "device grant" but it only deleted registration.yaml.example
and left the failed appservice+/sync hybrid in client.go):

1. Land the MAS OAuth 2.0 device grant that was running in prod but never
   committed: masauth.go + client.go rewrite. Bot stays a normal user so /sync
   works; refresh token persisted in data/mas_auth.json.

2. Add "appservice" as an alternate transport behind AUTH_MODE (default
   "masdevice" = unchanged device-grant path, instant rollback):
   - internal/bot/session.go: Session abstraction unifying both transports
     (OnEventType/Run/Stop); NewSession dispatches on AuthMode.
   - internal/bot/appservice.go: as_token auth (MAS-durable, no login/MFA/expiry),
     cryptohelper MSC4190 device creation, crypto machine fed from Synapse
     transaction pushes (to-device/device-lists/OTK) instead of /sync, inbound
     decrypt+redispatch, and lazy per-room StateStore backfill (encryption +
     members) so replies in encrypted rooms encrypt to the right recipients.
   - main.go: NewSession/sess.OnEventType/sess.Run in place of the /sync loop.
   - .env.example: AUTH_MODE, AS_REGISTRATION, AS_LISTEN_HOST/PORT, HOMESERVER_DOMAIN.

The appservice path fixes the earlier hybrid's fatal flaw (Synapse forbids AS
users from /sync) by using the transaction/push model. Bot-side only; Synapse
registration + experimental_features (msc2409/msc3202/msc4190) and E2EE cutover
are the next steps. Build + vet green (CGO=1 -tags goolm).
This commit is contained in:
prosolis
2026-07-03 17:11:58 -07:00
parent 20d1f92f97
commit 6387380d0a
9 changed files with 889 additions and 143 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
go.mod
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@@ -11,6 +11,7 @@ require (
github.com/joho/godotenv v1.5.1
github.com/olebedev/when v1.1.0
github.com/robfig/cron/v3 v3.0.1
github.com/rs/zerolog v1.35.1
github.com/skip2/go-qrcode v0.0.0-20200617195104-da1b6568686e
golang.org/x/image v0.40.0
maunium.net/go/mautrix v0.28.1
@@ -21,6 +22,7 @@ require (
filippo.io/edwards25519 v1.2.0 // indirect
github.com/AlekSi/pointer v1.0.0 // indirect
github.com/andybalholm/cascadia v1.3.3 // indirect
github.com/coder/websocket v1.8.15 // indirect
github.com/dustin/go-humanize v1.0.1 // indirect
github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect
github.com/mattn/go-colorable v0.1.14 // indirect
@@ -30,7 +32,6 @@ require (
github.com/petermattis/goid v0.0.0-20260330135022-df67b199bc81 // indirect
github.com/pkg/errors v0.9.1 // indirect
github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
github.com/rs/zerolog v1.35.1 // indirect
github.com/tidwall/gjson v1.19.0 // indirect
github.com/tidwall/match v1.1.1 // indirect
github.com/tidwall/pretty v1.2.1 // indirect
@@ -41,6 +42,7 @@ require (
golang.org/x/net v0.56.0 // indirect
golang.org/x/sys v0.46.0 // indirect
golang.org/x/text v0.38.0 // indirect
gopkg.in/yaml.v3 v3.0.1 // indirect
modernc.org/libc v1.72.3 // indirect
modernc.org/mathutil v1.7.1 // indirect
modernc.org/memory v1.11.0 // indirect