The ST10's /presets response after a factory reset emits self-closing
<preset/> entries with no ContentItem child. cmd/soundtouch-cli's
getPresets() handled the missing ContentItem in GetDisplayName() but
then dereferenced preset.ContentItem.Source on the next line, panicking
with "invalid memory address or nil pointer dereference" the moment the
loop reached the first empty entry.
A second placeholder shape was observed on healthy devices that were
never reset: <preset id="0"><ContentItem source="INVALID_SOURCE"
isPresetable="true"/></preset>. ContentItem is non-nil here, so the
previous "ContentItem != nil" guard at other call sites still let
these placeholders through into listings and into the AfterTouch
datastore.
Fix shape:
pkg/models/presets.go - extend Preset.IsEmpty() to recognise both
shapes (ContentItem == nil, OR Source == "" / "INVALID_SOURCE").
HasPresets, GetEmptyPresetSlots and GetUsedPresetSlots become honest
about which slots actually carry playable content.
cmd/soundtouch-cli/cmd_info.go (the crash site) - filter the slice
via IsEmpty before the print loop, and switch the still-printed
fields to the existing nil-safe Get* helpers.
pkg/service/setup/setup.go - upgrade syncPresets's "ContentItem ==
nil" continue-guard to IsEmpty so Shape B placeholders don't get
persisted in the AfterTouch datastore and then surface as junk
rows in the admin web UI.
cmd/soundtouch-cli/cmd_events.go, cmd/websocket-demo/main.go - same
nil-guard upgrade. These already nil-checked so were crash-safe;
the change is for consistency and to stop printing
"Preset 0: (INVALID_SOURCE)" demo lines.
examples/preset-management/main.go - had the same latent crash as
cmd_info.go; same fix shape.
Regression tests in pkg/models/presets_test.go cover both shapes using
the exact XML observed in the wild: the reporter's three <preset/>
placeholders plus the three INVALID_SOURCE entries from a live device.
The reporter XML test walks every preset through the same accessor
path the CLI used and asserts no panic.
The soundtouch-web Go code does not deref preset.ContentItem.X
anywhere - presets flow through as JSON - so no separate crash trap
exists there. The web frontend will pick up the cleaner data once
syncPresets stops persisting placeholders.
Closes#308
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
- Add comprehensive preset reading functionality with helper methods
- Implement GetNextAvailablePresetSlot() and IsCurrentContentPresetable()
- Add CLI support for viewing presets with -presets flag
- Fix Preset XML tag to use lowercase 'preset' for API compliance
- Update documentation to reflect official API design:
* GET /presets: fully implemented with rich analysis
* POST /presets: officially 'N/A' per Bose documentation (not supported by design)
- Add detailed PRESET-MANAGEMENT.md documentation
- Update API endpoints overview and project status
- All tests passing with real device validation
Preset management is now 100% complete according to official API specification.
Read operations provide comprehensive preset analysis, while creation
is intentionally handled by official app/hardware controls per API design.
Tobias GesellchenandClaude Opus 4.7