feat: add agent query API

apps/freya-backend/src/agent/http.ts

@@ -0,0 +1,124 @@
+import type { Context, Hono } from "hono"
+
+import { type } from "arktype"
+import { createMiddleware } from "hono/factory"
+
+import type { AuthSessionMiddleware } from "../auth/session-middleware.ts"
+import type { QueryDebugTools } from "./debug-tools.ts"
+import type { QueryAgent } from "./query-agent.ts"
+
+import { collectQueryAgentResponse, QueryAgentError } from "./query-agent.ts"
+
+type Env = {
+	Variables: {
+		queryAgent: QueryAgent
+	}
+}
+
+type DebugEnv = {
+	Variables: {
+		debugTools: QueryDebugTools
+	}
+}
+
+interface AgentHttpHandlersDeps {
+	queryAgent: QueryAgent
+	authSessionMiddleware: AuthSessionMiddleware
+}
+
+interface AgentDebugHttpHandlersDeps {
+	authSessionMiddleware: AuthSessionMiddleware
+	debugTools: QueryDebugTools
+	debug?: boolean
+}
+
+const AgentAskRequestBody = type({
+	"+": "reject",
+	message: "string",
+})
+
+export function registerAgentHttpHandlers(
+	app: Hono,
+	{ queryAgent, authSessionMiddleware }: AgentHttpHandlersDeps,
+) {
+	const inject = createMiddleware<Env>(async (c, next) => {
+		c.set("queryAgent", queryAgent)
+		await next()
+	})
+
+	app.post("/api/agent", inject, authSessionMiddleware, handleAgentAsk)
+}
+
+export function registerDebugAgentHttpHandlers(app: Hono, deps: AgentDebugHttpHandlersDeps) {
+	const { authSessionMiddleware, debugTools, debug = process.env.NODE_ENV !== "production" } = deps
+	if (process.env.NODE_ENV === "production" || !debug) return
+
+	const inject = createMiddleware<DebugEnv>(async (c, next) => {
+		c.set("debugTools", debugTools)
+		await next()
+	})
+
+	app.get("/api/agent/tools", inject, authSessionMiddleware, handleListTools)
+	app.post("/api/agent/tools/:toolName", inject, authSessionMiddleware, handleExecuteTool)
+}
+
+async function handleAgentAsk(c: Context<Env>) {
+	let body: unknown
+	try {
+		body = await c.req.json()
+	} catch {
+		return c.json({ error: "Invalid JSON" }, 400)
+	}
+
+	const parsed = AgentAskRequestBody(body)
+	if (parsed instanceof type.errors) {
+		return c.json({ error: parsed.summary }, 400)
+	}
+
+	const user = c.get("user")!
+	const queryAgent = c.get("queryAgent")
+
+	try {
+		const response = await collectQueryAgentResponse(queryAgent, {
+			userId: user.id,
+			message: parsed.message,
+		})
+		return c.json(response)
+	} catch (err) {
+		if (err instanceof QueryAgentError) {
+			console.error("[query] Query agent failed:", err)
+			return c.json({ error: err.message }, 500)
+		}
+		throw err
+	}
+}
+
+async function handleListTools(c: Context<DebugEnv>) {
+	const debugTools = c.get("debugTools")
+
+	return c.json({ tools: debugTools.list() })
+}
+
+async function handleExecuteTool(c: Context<DebugEnv>) {
+	const debugTools = c.get("debugTools")
+
+	const toolName = c.req.param("toolName")
+	if (!toolName) {
+		return c.body(null, 404)
+	}
+
+	let params: unknown
+	try {
+		params = await c.req.json()
+	} catch {
+		return c.json({ error: "Invalid JSON" }, 400)
+	}
+
+	const user = c.get("user")!
+	try {
+		const result = await debugTools.execute(user.id, toolName, params)
+		return c.json({ result })
+	} catch (err) {
+		return c.json({ error: err instanceof Error ? err.message : String(err) }, 400)
+	}
+}