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`copilot.ts`

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3cbe3d6Claude	1	/**
	2	* Block D9 — Copilot-style completion HTTP surface.
	3	*
	4	* POST /api/copilot/completions (authed — PAT / OAuth / session)
	5	* Body: { prefix, suffix?, language?, repo? }
	6	* Returns: { completion, model, cached }
	7	*
	8	* GET /api/copilot/ping (unauthed)
	9	* Returns: { ok: true, aiAvailable: boolean }
	10	*
	11	* Keep per-user limits tight: IDE plugins call this on every keystroke, so a
	12	* misbehaving client can otherwise exhaust the shared Anthropic quota fast.
	13	*/
	14
0410f22Claude	15	// For proactive, context-aware suggestions see POST /api/pair/suggest (src/routes/pair-programmer.ts)
	16
3cbe3d6Claude	17	import { Hono } from "hono";
	18	import { requireAuth } from "../middleware/auth";
	19	import type { AuthEnv } from "../middleware/auth";
	20	import { rateLimit } from "../middleware/rate-limit";
	21	import { completeCode } from "../lib/ai-completion";
	22	import { isAiAvailable } from "../lib/ai-client";
	23
	24	const copilot = new Hono<AuthEnv>();
	25
	26	// Tight per-caller limit: 60/min. NOTE: `rateLimit` keys by bearer-token
	27	// prefix when Authorization is present, otherwise by IP — so session-cookie
	28	// callers share a single IP bucket. That's acceptable for an IDE endpoint
	29	// where the expected caller is almost always a PAT/OAuth token.
0316dbbClaude	30	const completionLimit = rateLimit(60, 60_000, "copilot");
3cbe3d6Claude	31
	32	copilot.get("/api/copilot/ping", (c) => {
	33	return c.json({ ok: true, aiAvailable: isAiAvailable() });
	34	});
	35
	36	copilot.post(
	37	"/api/copilot/completions",
	38	completionLimit,
	39	requireAuth,
	40	async (c) => {
	41	let body: any;
	42	try {
	43	body = await c.req.json();
	44	} catch {
	45	return c.json({ error: "invalid JSON body" }, 400);
	46	}
	47	if (!body \|\| typeof body !== "object") {
	48	return c.json({ error: "body must be a JSON object" }, 400);
	49	}
	50
	51	const { prefix, suffix, language, repo } = body as {
	52	prefix?: unknown;
	53	suffix?: unknown;
	54	language?: unknown;
	55	repo?: unknown;
	56	};
	57
	58	if (typeof prefix !== "string" \|\| prefix.length === 0) {
	59	return c.json({ error: "prefix (non-empty string) is required" }, 400);
	60	}
	61
	62	const result = await completeCode({
	63	prefix,
	64	suffix: typeof suffix === "string" ? suffix : undefined,
	65	language: typeof language === "string" ? language : undefined,
	66	repoHint: typeof repo === "string" ? repo : undefined,
	67	});
	68
	69	return c.json(result);
	70	}
	71	);
	72
	73	export default copilot;