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learnharness/app/api/settings/prompts/[...segment]/route.ts
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/**
* PUT/DELETE /api/settings/prompts/[...segment] — the override TEXT for
* one prompt segment (settings-storage wave, 2026-09-19).
*
* PUT body {text} → writes data/prompts/<segment path mirror>. 200.
* The segment must be a CURRENT source segment (allSegmentPaths
* — derived from src/agent/prompts at runtime): overriding a
* segment that doesn't compose is a typo or a vanished fragment,
* a 400, never a silent orphan.
* DELETE → removes the override file (idempotent). Switches are NOT
* touched — an on-switch with no file composes the source
* default (inert by design), so the user's switch state survives
* a delete/re-write cycle.
*
* The ON/OFF switch itself lives in the record's agent.prompts map
* (PUT /api/settings/agent) — file presence alone is never the override.
*/
import { allSegmentPaths, isValidSegmentPath, promptOverrides } from "@/src/server";
export const dynamic = "force-dynamic";
/** Re-join the catch-all segments into the mirror-layout path; null when
* the shape is invalid (traversal, wrong layout — the store re-guards). */
function segmentPathFrom(segments: string[]): string | null {
const joined = segments.map(decodeURIComponent).join("/");
return isValidSegmentPath(joined) ? joined : null;
}
export async function PUT(request: Request, ctx: { params: Promise<{ segment: string[] }> }) {
const { segment } = await ctx.params;
const path = segmentPathFrom(segment);
if (!path) return Response.json({ error: "invalid segment path" }, { status: 400 });
const body = (await request.json().catch(() => null)) as { text?: unknown } | null;
if (!body || typeof body.text !== "string") {
return Response.json({ error: "body must be {text: string}" }, { status: 400 });
}
if (!new Set(allSegmentPaths()).has(path)) {
return Response.json(
{ error: `"${path}" is not a current source segment`, supported: allSegmentPaths() },
{ status: 400 },
);
}
promptOverrides.writeOverride(path, body.text);
return Response.json({ path, text: body.text });
}
export async function DELETE(_request: Request, ctx: { params: Promise<{ segment: string[] }> }) {
const { segment } = await ctx.params;
const path = segmentPathFrom(segment);
if (!path) return Response.json({ error: "invalid segment path" }, { status: 400 });
promptOverrides.deleteOverride(path);
return Response.json({ path, deleted: true });
}