Files
coder/coderd/audit/diff.go
T
Mathias FredrikssonandMichael Suchacz d3f08b1983 feat: audit chat system instructions changes (#27668)
Adds an audit record for administrative events on the deployment-wide
chat instruction settings (system prompt, the include-default toggle,
and the plan-mode instructions), per CODAGT-719 and operator decision
D5. Each endpoint records under a stable identity: resource type
`chat_instruction_settings`, a fixed resource ID and a human-readable
target ("System prompt", "Plan mode instructions"), so two changes to
one setting share an ID and history-by-setting works. A real change
exports a Write entry with the old-to-new text visible; a
value-identical PUT still upserts and still returns 204 but records
nothing.

Attempts are recorded, not only transitions. Identity is assigned before
the authorization check, so a denied PUT exports a 403 row with an empty
diff (no request content reaches it), a validation failure exports a 400
row, and a write failure exports a 500 row, each with an empty diff; an
operator can tell "nothing changed" from "something changed and capture
degraded" by the status code.

The write path stays authoritative. The advisory lock and, on plan-mode,
the transaction exist only to serve change-detection; if any of that
machinery fails (lock, begin, commit, rollback), the handler runs main's
idempotent write path directly and derives the response from it, so a
member-visible failure of audit-only infrastructure can never replace
main's successful response. Accepted consequence: when the lock cannot
be taken, two concurrent identical writes can produce two rows instead
of one. That is audit degradation, which is allowed; changing a member's
response is not. Write failures keep the exact response the endpoint
produced before this wiring (transaction error for the system prompt,
which was always transactional; the raw write error for plan mode, which
was not), and the full transaction error is logged so rollback failures
cannot vanish.

<details>
<summary>CODAGT-66 plan entry: S1 (verbatim)</summary>

**S1 `feat: audit chat system instructions changes`** (CODAGT-719; base:
main)

- Struct: `database.ChatSystemPromptSettings{ID uuid.UUID; SystemPrompt
string; IncludeDefaultSystemPrompt bool; PlanModeInstructions string}`
in `coderd/database/types.go` (ticket-sketched shape; one struct, both
endpoints).
- Registration: union entry (diff.go), table.go entry (`id`
ActionIgnore, other three ActionTrack), `AuditActionMap` Write-only;
four request.go cases (`ResourceTarget` "", `ResourceID` from struct,
`ResourceType` new enum value `chat_system_prompt_settings`,
`ResourceRequiresOrgID` false with the "Artificial ID / deployment
singleton" comment convention).
- Migration: `ALTER TYPE resource_type ADD VALUE IF NOT EXISTS
'chat_system_prompt_settings';` comment-only no-op down (000558 shape);
number picked at push per the numbering constraint.
- codersdk: constant + prose `FriendlyString` ("chat system prompt
settings"); `TestAuditDBEnumsCovered` forces both. `coderd/audit.go`
presentation switches: rely on safe defaults (no link, generic
description); no FE changes (filter label falls back to capitalized
value; acceptable per precedent).
- Wiring `putChatSystemPrompt` and `putChatPlanModeInstructions`:
InitRequest with Action Write; artificial `ID: uuid.New()` on `New` only
when a change is detected; no-op suppression by leaving both aReq sides
unset (nil resource IDs skip the log, request.go skip rule); the write
path itself stays byte-identical (upserts still run unconditionally).
- `putChatSystemPrompt` (writes two keys conditionally in one existing
tx): inside that tx, read the pair via `GetChatSystemPromptConfig` for
`Old`, perform the conditional writes exactly as today, then RE-READ the
pair for `New`. The re-read is load-bearing:
`include_default_system_prompt` is computed from the toggle row AND the
prompt, so a prompt-only write can flip the effective value without the
request carrying the pointer. `PlanModeInstructions` stays zero on both
sides.
- `putChatPlanModeInstructions` (no tx exists today): wrap its
read-upsert in `InTx` (behavior-preserving: same single write);
`Old`/`New` populate only `PlanModeInstructions`; the two system-prompt
fields stay zero on both sides; no cross-key reads.
- Change detection compares the populated payload fields only (never the
artificial ID).
- Tests: handler-level coderdtest with `audit.NewMock()` asserting Write
entry on change and NO entry on a value-identical PUT, for both
endpoints (this also exercises `ResourceRequiresOrgID` end to end); the
fallback-flip case (no explicit include-default row, nonempty prompt set
to empty, effective boolean flips: entry emitted with the boolean diff);
diff assertions (old->new prompt text tracked, not secret) in
`enterprise/audit/diff_internal_test.go`; `TestAuditableResources`
passes by construction.
- Bookkeeping at PR open: correct CODAGT-719's no-op premise ("matches
the existing 204-on-unchanged behavior" does not exist on main;
suppression is new, write path unchanged).
- Review focus: Old capture and the New re-read inside the tx (three of
four existing singletons never set Old; do not copy them; and the
computed include-default value makes a naive New construction wrong);
the skip-on-no-op mechanism; prompt text deliberately visible in diffs.

</details>

Note: the plan excerpt above predates operator decision D5 (2026-07-30),
which this PR implements: the resource type is
`chat_instruction_settings` (not `chat_system_prompt_settings`), each
setting carries a stable ID and a display-name target (not a per-write
artificial ID and an empty target), no-op suppression runs through
`InitRequestWithCancel` (not the nil-ID skip), and attempts (denied,
failed, capture-degraded) record rows with real statuses and empty
diffs. Ticket bookkeeping for CODAGT-719 was corrected on Linear at
kickoff: the ticket's "matches the existing 204-on-unchanged behavior"
premise does not exist on main; suppression is new, and the write path
is unchanged.

> 🤖 This PR was created with the help of Coder Agents, and _will be_
reviewed by a human. 🏂🏻

---------

Co-authored-by: Michael Suchacz <203725896+ibetitsmike@users.noreply.github.com>
2026-08-18 20:03:06 +02:00

81 lines
2.2 KiB
Go

package audit
import (
"github.com/coder/coder/v2/coderd/database"
"github.com/coder/coder/v2/coderd/idpsync"
)
// Auditable is mostly a marker interface. It contains a definitive list of all
// auditable types. If you want to audit a new type, first define it in
// AuditableResources, then add it to this interface.
type Auditable interface {
database.APIKey |
database.Template |
database.TemplateVersion |
database.User |
database.WorkspaceTable |
database.GitSSHKey |
database.WorkspaceBuild |
database.AuditableGroup |
database.License |
database.WorkspaceProxy |
database.AuditOAuthConvertState |
database.HealthSettings |
database.NotificationsSettings |
database.OAuth2ProviderApp |
database.OAuth2ProviderAppSecret |
database.PrebuildsSettings |
database.OAuth2ProviderSettings |
database.CustomRole |
database.AuditableOrganizationMember |
database.Organization |
database.NotificationTemplate |
idpsync.OrganizationSyncSettings |
idpsync.GroupSyncSettings |
idpsync.RoleSyncSettings |
database.TaskTable |
database.AISeatState |
database.AIProvider |
database.AIProviderKey |
database.AIGatewayKey |
database.Chat |
database.AuditableGroupAIBudget |
database.AuditableUserAIBudgetOverride |
database.UserSecret |
database.UserSkill |
database.ChatInstructionSettings
}
// Map is a map of changed fields in an audited resource. It maps field names to
// the old and new value for that field.
type Map map[string]OldNew
// OldNew is a pair of values representing the old value and the new value.
type OldNew struct {
Old any
New any
Secret bool
}
// Empty returns a default value of type T.
func Empty[T Auditable]() T {
var t T
return t
}
// Diff compares two auditable resources and produces a Map of the changed
// values.
func Diff[T Auditable](a Auditor, left, right T) Map { return a.diff(left, right) }
// Differ is used so the enterprise version can implement the diff function in
// the Auditor feature interface. Only types in the same package as the
// interface can implement unexported methods.
type Differ struct {
DiffFn func(old, newVal any) Map
}
//nolint:unused
func (d Differ) diff(old, newVal any) Map {
return d.DiffFn(old, newVal)
}