feat: add Bearer token auth to MCP alongside API key auth

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/server/mcp/index.ts

@@ -4,6 +4,7 @@ import { WebStandardStreamableHTTPServerTransport } from "@modelcontextprotocol/
 import { Hono } from "hono";
 import { db as prodDb } from "../../db/index.ts";
 import { getUserCount, verifyApiKey } from "../services/auth.service.ts";
+import { verifyAccessToken } from "../services/oauth.service.ts";
 import { getCollectionSummary } from "./resources/collection.ts";
 import {
 	categoryToolDefinitions,
@@ -88,20 +89,36 @@ export const mcpRoutes = new Hono();
 // Auth middleware for all MCP requests
 mcpRoutes.use("/*", async (c, next) => {
 	const db = c.get("db") ?? prodDb;
-	const apiKey = c.req.header("X-API-Key");
 
-	// Require API key when auth is configured (users exist)
-	if (getUserCount(db) > 0) {
-		if (!apiKey) {
-			return c.json({ error: "API key required" }, 401);
-		}
-		const valid = await verifyApiKey(db, apiKey);
-		if (!valid) {
-			return c.json({ error: "Invalid API key" }, 401);
-		}
+	// Skip auth if no users exist
+	if (getUserCount(db) <= 0) {
+		return next();
 	}
 
-	return next();
+	// Try Bearer token first (OAuth)
+	const authHeader = c.req.header("Authorization");
+	if (authHeader?.startsWith("Bearer ")) {
+		const token = authHeader.slice(7);
+		if (verifyAccessToken(db, token)) {
+			return next();
+		}
+		return c.json({ error: "invalid_token" }, 401);
+	}
+
+	// Try API key (existing flow)
+	const apiKey = c.req.header("X-API-Key");
+	if (apiKey) {
+		const valid = await verifyApiKey(db, apiKey);
+		if (valid) {
+			return next();
+		}
+		return c.json({ error: "Invalid API key" }, 401);
+	}
+
+	// No auth provided — return 401 with WWW-Authenticate to trigger OAuth flow
+	return c.text("Unauthorized", 401, {
+		"WWW-Authenticate": 'Bearer resource_metadata="/.well-known/oauth-authorization-server"',
+	});
 });
 
 mcpRoutes.post("/", async (c) => {