424 lines
16 KiB
TypeScript
424 lines
16 KiB
TypeScript
import { serveStatic } from "./static.ts";
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import { assertConfig, config } from "./config.ts";
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import {
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clearAttempts,
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extractBearer,
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hashSecret,
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isRateLimited,
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issueToken,
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login,
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newAccessKey,
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recordAttempt,
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revokeToken,
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verifyToken,
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type PublicUser,
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} from "./auth.ts";
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import {
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addMessage,
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createConversation,
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createUser,
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deleteConversation,
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deleteShare,
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deleteUser,
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deleteUserSessions,
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ensureShare,
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getConversation,
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getMessages,
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getShareByConv,
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getShareByPublic,
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getUserById,
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getUserByUsername,
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listConversations,
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listUsers,
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toPublicUser,
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touchConversation,
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updateConversation,
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updateUser,
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} from "./db.ts";
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import type { ChatMessage } from "./drivers/types.ts";
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import { DriverRegistry } from "./drivers/registry.ts";
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assertConfig();
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const registry = new DriverRegistry();
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function json(data: unknown, status = 200): Response {
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return new Response(JSON.stringify(data), {
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status,
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headers: { "Content-Type": "application/json", "Cache-Control": "no-store" },
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});
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}
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function clientIp(req: Request, server: { requestIP?: (r: Request) => { address: string } | null }): string {
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try {
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const info = server.requestIP?.(req);
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if (info?.address) return info.address;
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} catch {
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// ignore
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}
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return req.headers.get("x-forwarded-for")?.split(",")[0]?.trim() ?? "unknown";
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}
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function requireAuth(req: Request): PublicUser | null {
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const token = extractBearer(req);
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if (!token) return null;
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return verifyToken(token);
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}
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function validMessages(v: unknown): v is ChatMessage[] {
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if (!Array.isArray(v) || v.length === 0 || v.length > 200) return false;
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return v.every(
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(m) =>
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m &&
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typeof m === "object" &&
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(m.role === "user" || m.role === "assistant" || m.role === "system") &&
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typeof m.content === "string" &&
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m.content.length <= 100_000,
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);
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}
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function cleanStr(v: unknown, max: number): string | null {
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if (typeof v !== "string") return null;
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const t = v.trim();
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if (t.length === 0 || t.length > max) return null;
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return t;
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}
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function validTheme(v: unknown): v is string {
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return v === "auto" || v === "light" || v === "dark";
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}
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function validAvatar(v: unknown): string | null {
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if (v === "" || v === undefined || v === null) return "";
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if (typeof v !== "string") return null;
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const t = v.trim();
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if (t.length > 2048) return null;
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if (!/^https?:\/\//i.test(t)) return null;
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return t;
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}
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function validUsername(v: unknown): string | null {
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if (typeof v !== "string") return null;
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const t = v.trim().toLowerCase();
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if (!/^[a-z0-9._-]{2,32}$/.test(t) || t === "admin") return null;
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return t;
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}
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async function readJson(req: Request): Promise<{ ok: boolean; body: Record<string, unknown> }> {
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try {
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return { ok: true, body: (await req.json()) as Record<string, unknown> };
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} catch {
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return { ok: false, body: {} };
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}
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}
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const server = Bun.serve({
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port: config.port,
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hostname: config.host,
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async fetch(req, server) {
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const url = new URL(req.url);
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const path = url.pathname;
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// --- public: shared chat page data (no auth) ---
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const shareMatch = path.match(/^\/api\/share\/([A-Za-z0-9_-]{6,64})$/);
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if (shareMatch && req.method === "GET") {
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const s = getShareByPublic(shareMatch[1]!);
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if (!s) return json({ error: "share not found" }, 404);
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return json({
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title: s.conv.title,
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topic: s.conv.topic,
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model: s.conv.model,
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authorName: s.authorName,
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sharedAt: s.sharedAt,
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messages: s.messages.map((m) => ({ role: m.role, content: m.content })),
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});
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}
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// --- auth: login (rate limited) ---
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if (path === "/api/auth/login" && req.method === "POST") {
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const ip = clientIp(req, server);
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if (isRateLimited(ip)) return json({ error: "too many attempts, try again later" }, 429);
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const { ok, body } = await readJson(req);
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if (!ok || typeof body.username !== "string" || typeof body.key !== "string") {
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recordAttempt(ip);
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return json({ error: 'expected { username, key }' }, 400);
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}
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const user = login(body.username.trim().toLowerCase(), body.key);
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if (!user) {
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recordAttempt(ip);
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await Bun.sleep(400);
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return json({ error: "invalid credentials" }, 401);
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}
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clearAttempts(ip);
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const { token, expiresAt } = issueToken(user);
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return json({ token, expiresAt, user });
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}
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if (path === "/api/auth/verify" && req.method === "GET") {
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const user = requireAuth(req);
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return user ? json({ ok: true, user }) : json({ error: "unauthorized" }, 401);
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}
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if (path === "/api/auth/logout" && req.method === "POST") {
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const token = extractBearer(req);
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if (token) revokeToken(token);
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return json({ ok: true });
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}
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// --- everything below requires auth ---
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if (path.startsWith("/api/")) {
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const user = requireAuth(req);
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if (!user) return json({ error: "unauthorized" }, 401);
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const admin = user.isAdmin;
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// --- self profile ---
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if (path === "/api/me" && req.method === "GET") return json({ user });
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if (path === "/api/me" && req.method === "PATCH") {
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const { ok, body } = await readJson(req);
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if (!ok) return json({ error: "invalid JSON" }, 400);
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const patch: { displayName?: string; avatarUrl?: string; theme?: string } = {};
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if (body.displayName !== undefined) {
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const d = cleanStr(body.displayName, 60);
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if (d === null) return json({ error: "displayName: 1-60 chars" }, 400);
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patch.displayName = d;
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}
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if (body.avatarUrl !== undefined) {
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const a = validAvatar(body.avatarUrl);
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if (a === null) return json({ error: "avatarUrl must be an http(s) URL or empty (e.g. catbox.moe link)" }, 400);
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patch.avatarUrl = a;
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}
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if (body.theme !== undefined) {
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if (!validTheme(body.theme)) return json({ error: "theme must be auto|light|dark" }, 400);
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patch.theme = body.theme;
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}
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const updated = updateUser(user.id, patch);
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if (!updated) return json({ error: "user not found" }, 404);
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return json({ user: toPublicUser(updated) });
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}
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// --- admin: user management (No-KYC accounts, keys issued by admin) ---
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if (path === "/api/admin/users" && req.method === "GET") {
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if (!admin) return json({ error: "forbidden" }, 403);
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return json({ users: listUsers().map(toPublicUser) });
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}
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if (path === "/api/admin/users" && req.method === "POST") {
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if (!admin) return json({ error: "forbidden" }, 403);
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const { ok, body } = await readJson(req);
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if (!ok) return json({ error: "invalid JSON" }, 400);
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const username = validUsername(body.username);
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if (!username) return json({ error: "username: 2-32 chars [a-z0-9._-], 'admin' reserved" }, 400);
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if (getUserByUsername(username)) return json({ error: "username taken" }, 409);
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const displayName = body.displayName === undefined ? username : cleanStr(body.displayName, 60);
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if (displayName === null) return json({ error: "displayName: 1-60 chars" }, 400);
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const avatarUrl = body.avatarUrl === undefined ? "" : validAvatar(body.avatarUrl);
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if (avatarUrl === null) return json({ error: "avatarUrl must be an http(s) URL or empty" }, 400);
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const theme = body.theme === undefined ? "auto" : body.theme;
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if (!validTheme(theme)) return json({ error: "theme must be auto|light|dark" }, 400);
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const key = newAccessKey();
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const created = createUser({ username, displayName, avatarUrl, theme, keyHash: hashSecret(key) });
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// Show the raw key exactly once.
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return json({ user: toPublicUser(created), key }, 201);
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}
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const adminUserMatch = path.match(/^\/api\/admin\/users\/([0-9a-f-]{10,50})(\/regenerate)?$/);
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if (adminUserMatch) {
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if (!admin) return json({ error: "forbidden" }, 403);
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const target = getUserById(adminUserMatch[1]!);
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if (!target || target.username === "admin") return json({ error: "user not found" }, 404);
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if (req.method === "DELETE" && !adminUserMatch[2]) {
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deleteUser(target.id);
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return json({ ok: true });
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}
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if (req.method === "POST" && adminUserMatch[2] === "/regenerate") {
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const key = newAccessKey();
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updateUser(target.id, { keyHash: hashSecret(key) });
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deleteUserSessions(target.id);
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return json({ key });
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}
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if (req.method === "PATCH" && !adminUserMatch[2]) {
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const { ok, body } = await readJson(req);
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if (!ok) return json({ error: "invalid JSON" }, 400);
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const patch: { displayName?: string; avatarUrl?: string; theme?: string } = {};
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if (body.displayName !== undefined) {
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const d = cleanStr(body.displayName, 60);
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if (d === null) return json({ error: "displayName: 1-60 chars" }, 400);
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patch.displayName = d;
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}
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if (body.avatarUrl !== undefined) {
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const a = validAvatar(body.avatarUrl);
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if (a === null) return json({ error: "avatarUrl must be an http(s) URL or empty" }, 400);
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patch.avatarUrl = a;
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}
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if (body.theme !== undefined) {
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if (!validTheme(body.theme)) return json({ error: "theme must be auto|light|dark" }, 400);
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patch.theme = body.theme;
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}
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const updated = updateUser(target.id, patch);
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return json({ user: toPublicUser(updated!) });
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}
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return json({ error: "not found" }, 404);
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}
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// --- conversations (server-persisted, per account) ---
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if (path === "/api/conversations" && req.method === "GET") {
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return json({ conversations: listConversations(user.id) });
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}
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if (path === "/api/conversations" && req.method === "POST") {
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const { ok, body } = await readJson(req);
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if (!ok) return json({ error: "invalid JSON" }, 400);
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const conv = createConversation(user.id, {
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title: typeof body.title === "string" ? body.title : undefined,
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topic: typeof body.topic === "string" ? body.topic : undefined,
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model: typeof body.model === "string" ? body.model : undefined,
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});
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return json({ conversation: conv }, 201);
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}
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const convMatch = path.match(/^\/api\/conversations\/([0-9a-f-]{10,50})(\/(share))?$/);
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if (convMatch) {
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const conv = getConversation(convMatch[1]!);
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if (!conv || conv.user_id !== user.id) return json({ error: "conversation not found" }, 404);
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const isShare = convMatch[3] === "share";
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if (isShare) {
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if (req.method === "POST") {
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const publicId = ensureShare(conv.id);
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return json({ publicId, url: `/share/${publicId}` }, 201);
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}
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if (req.method === "GET") {
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const publicId = getShareByConv(conv.id);
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return publicId ? json({ publicId, url: `/share/${publicId}` }) : json({ shared: false });
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}
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if (req.method === "DELETE") {
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deleteShare(conv.id);
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return json({ ok: true });
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}
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return json({ error: "not found" }, 404);
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}
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if (req.method === "GET") {
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return json({ conversation: conv, messages: getMessages(conv.id) });
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}
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if (req.method === "PATCH") {
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const { ok, body } = await readJson(req);
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if (!ok) return json({ error: "invalid JSON" }, 400);
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const patch: { title?: string; topic?: string; model?: string } = {};
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if (body.title !== undefined) {
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if (typeof body.title !== "string" || body.title.length > 120) return json({ error: "title too long" }, 400);
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patch.title = body.title.trim();
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}
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if (body.topic !== undefined) {
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if (typeof body.topic !== "string" || body.topic.length > 120) return json({ error: "topic too long" }, 400);
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patch.topic = body.topic.trim();
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}
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if (body.model !== undefined) {
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if (typeof body.model !== "string" || body.model.length > 160) return json({ error: "model too long" }, 400);
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patch.model = body.model;
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}
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return json({ conversation: updateConversation(conv.id, patch) });
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}
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if (req.method === "DELETE") {
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deleteConversation(conv.id);
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return json({ ok: true });
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}
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return json({ error: "not found" }, 404);
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}
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if (path === "/api/models" && req.method === "GET") {
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const models = await registry.listAllModels();
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return json({ models });
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}
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if (path === "/api/chat" && req.method === "POST") {
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const { ok, body } = await readJson(req);
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if (!ok) return json({ error: "invalid JSON" }, 400);
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if (typeof body.model !== "string" || !validMessages(body.messages)) {
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return json({ error: 'expected { model: "driver:model", messages: [{role, content}] }' }, 400);
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}
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let driver, model: string;
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try {
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({ driver, model } = registry.splitId(body.model));
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} catch (e) {
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return json({ error: (e as Error).message }, 400);
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}
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const messages = body.messages as ChatMessage[];
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// Optional persistence into a server-side conversation (must belong to the user).
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let conv = null;
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if (body.conversationId !== undefined) {
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if (typeof body.conversationId !== "string") return json({ error: "bad conversationId" }, 400);
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conv = getConversation(body.conversationId);
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if (!conv || conv.user_id !== user.id) return json({ error: "conversation not found" }, 404);
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// Persist the new user message (dedupe against last stored one).
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const lastUser = [...messages].reverse().find((m) => m.role === "user");
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const stored = getMessages(conv.id);
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const lastStored = stored[stored.length - 1];
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if (lastUser && (!lastStored || lastStored.content !== lastUser.content || lastStored.role !== "user")) {
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addMessage(conv.id, "user", lastUser.content);
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if (conv.title === "New chat") {
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updateConversation(conv.id, { title: lastUser.content.slice(0, 50) || "New chat" });
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}
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}
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}
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const wantStream = body.stream === true || req.headers.get("accept") === "text/event-stream";
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const persistReply = (text: string) => {
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if (conv && text) {
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addMessage(conv.id, "assistant", text);
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touchConversation(conv.id, body.model as string);
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}
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};
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if (!wantStream) {
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try {
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const text = await driver.chat(messages, { model });
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persistReply(text);
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return json({ model: body.model, message: { role: "assistant", content: text } });
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} catch (e) {
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return json({ error: (e as Error).message }, 502);
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}
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}
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const stream = new ReadableStream({
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async start(controller) {
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const enc = new TextEncoder();
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const send = (event: string, data: string) =>
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controller.enqueue(enc.encode(`event: ${event}\ndata: ${data}\n\n`));
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let full = "";
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try {
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for await (const token of driver.chatStream(messages, { model })) {
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full += token;
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send("token", JSON.stringify({ token }));
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}
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persistReply(full);
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send("done", "{}");
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} catch (e) {
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if (full) persistReply(full + "\n\n[interrupted: " + (e as Error).message + "]");
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send("error", JSON.stringify({ error: (e as Error).message }));
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} finally {
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controller.close();
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}
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},
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});
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return new Response(stream, {
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headers: {
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"Content-Type": "text/event-stream",
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"Cache-Control": "no-cache",
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Connection: "keep-alive",
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},
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});
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}
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return json({ error: "not found" }, 404);
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}
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// --- static frontend (SPA fallback covers /share/:id) ---
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return serveStatic(req, url);
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},
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});
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console.log(`KisAssistant listening on http://${config.host}:${config.port}`);
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console.log(`Drivers (priority order): ${registry.ordered().map((d) => `${d.name}${d.enabled ? "" : " [disabled]"}`).join(" -> ")}`);
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void server;
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