fix(security): ship isolated JWT decorator hotfix

* fix(security): isolate dependency hotfix from github main

* fix(security): expose hotfix jwt decorators across routes

* test(e2e): restore stable app header selectors

* test(e2e): align planner and app shell checks

* test(e2e): add legacy settings page selectors

* test(e2e): align settings page contracts

backend/src/plugins/jwt.ts

@@ -0,0 +1,86 @@
+import { TextEncoder } from "node:util";
+import type { FastifyPluginAsync, FastifyRequest } from "fastify";
+import fastifyPlugin from "fastify-plugin";
+import { SignJWT, jwtVerify as verifyJwt } from "jose";
+
+const JWT_ALGORITHM = "HS256";
+const encoder = new TextEncoder();
+
+export interface JwtPluginOptions {
+	secret: string;
+	cookie: {
+		cookieName: string;
+		signed: boolean;
+	};
+}
+
+export interface JwtSignOptions {
+	expiresIn?: string | number;
+	key?: string;
+}
+
+export interface JwtVerifyOptions {
+	key?: string;
+}
+
+function getKey(secret: string): Uint8Array {
+	return encoder.encode(secret);
+}
+
+function getTokenFromRequest(request: FastifyRequest, cookieName: string): string {
+	const authorization = request.headers.authorization;
+	if (authorization) {
+		const [scheme, rawToken] = authorization.split(" ");
+		if (scheme?.toLowerCase() === "bearer" && rawToken?.trim()) {
+			return rawToken.trim();
+		}
+	}
+
+	const token = request.cookies?.[cookieName];
+	if (typeof token === "string" && token.length > 0) {
+		return token;
+	}
+
+	throw new Error("JWT token missing");
+}
+
+const jwtPluginImpl: FastifyPluginAsync<JwtPluginOptions> = async (app, options) => {
+	const defaultKey = getKey(options.secret);
+
+	app.decorate("jwt", {
+		sign(payload: Record<string, unknown>, signOptions?: JwtSignOptions) {
+			const tokenBuilder = new SignJWT(payload).setProtectedHeader({ alg: JWT_ALGORITHM, typ: "JWT" }).setIssuedAt();
+
+			if (signOptions?.expiresIn != null) {
+				tokenBuilder.setExpirationTime(signOptions.expiresIn);
+			}
+
+			return tokenBuilder.sign(getKey(signOptions?.key ?? options.secret));
+		},
+
+		async verify<T extends Record<string, unknown>>(token: string, verifyOptions?: JwtVerifyOptions): Promise<T> {
+			const { payload } = await verifyJwt(token, getKey(verifyOptions?.key ?? options.secret), {
+				algorithms: [JWT_ALGORITHM],
+				typ: "JWT",
+			});
+
+			return payload as T;
+		},
+	});
+
+	app.decorateRequest("jwtVerify", async function jwtVerify<
+		T extends Record<string, unknown>,
+	>(this: FastifyRequest, verifyOptions?: JwtVerifyOptions): Promise<T> {
+		const token = getTokenFromRequest(this, options.cookie.cookieName);
+		const { payload } = await verifyJwt(token, verifyOptions?.key ? getKey(verifyOptions.key) : defaultKey, {
+			algorithms: [JWT_ALGORITHM],
+			typ: "JWT",
+		});
+
+		return payload as T;
+	});
+};
+
+export const jwtPlugin = fastifyPlugin(jwtPluginImpl, {
+	name: "medassist-jwt-plugin",
+});