Milstolpe 1: skelett — Fastify-backend med login, Vue-frontend (mörkt Jellyseerr-tema), Dockerfile

- backend: /api/health, /api/login|logout|session, sessionscookie,
  timingSafeEqual-lösenordskoll, allt annat under /api kräver inloggning,
  serverar byggd frontend med SPA-fallback; 4 tester (node:test)
- frontend: Vue 3 + Vite, login-sida, Upptäck-skal, sökfält (stub),
  mörkt tema enligt Jellyseerr-förlagan
- docker: multi-stage arm64-image; config-plumbing för Lidarr/Jellyfin/
  Gemini via env (Jellyfin-historik prioriterad som signal per Björn)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01824ZrvG2mDYYrmwqypLNup

backend/src/app.js

@@ -0,0 +1,80 @@
+import { existsSync } from 'node:fs'
+import { timingSafeEqual } from 'node:crypto'
+import path from 'node:path'
+import { fileURLToPath } from 'node:url'
+import Fastify from 'fastify'
+import fastifyCookie from '@fastify/cookie'
+import fastifySession from '@fastify/session'
+import fastifyStatic from '@fastify/static'
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url))
+
+const OPEN_ROUTES = new Set(['/api/health', '/api/login', '/api/session'])
+
+function passwordOk(given, expected) {
+  if (typeof given !== 'string' || !expected) return false
+  const a = Buffer.from(given)
+  const b = Buffer.from(expected)
+  return a.length === b.length && timingSafeEqual(a, b)
+}
+
+export function buildApp(config) {
+  const app = Fastify({ logger: true, trustProxy: true })
+
+  app.register(fastifyCookie)
+  app.register(fastifySession, {
+    secret: config.sessionSecret,
+    cookie: {
+      secure: 'auto',
+      httpOnly: true,
+      sameSite: 'lax',
+      maxAge: 30 * 24 * 60 * 60 * 1000,
+    },
+  })
+
+  // allt under /api utom OPEN_ROUTES kräver inloggad session
+  app.addHook('preHandler', async (req, reply) => {
+    if (!req.url.startsWith('/api/')) return
+    const route = req.url.split('?')[0]
+    if (OPEN_ROUTES.has(route)) return
+    if (req.session.get('user')) return
+    return reply.code(401).send({ error: 'ej inloggad' })
+  })
+
+  app.get('/api/health', async () => ({ status: 'ok' }))
+
+  app.get('/api/session', async (req) => ({
+    authenticated: Boolean(req.session.get('user')),
+  }))
+
+  app.post('/api/login', async (req, reply) => {
+    if (!config.appPassword) {
+      return reply.code(500).send({ error: 'APP_PASSWORD är inte satt' })
+    }
+    const { password } = req.body ?? {}
+    if (!passwordOk(password, config.appPassword)) {
+      return reply.code(401).send({ error: 'fel lösenord' })
+    }
+    req.session.set('user', 'brasse')
+    return { ok: true }
+  })
+
+  app.post('/api/logout', async (req) => {
+    await req.session.destroy()
+    return { ok: true }
+  })
+
+  // byggd frontend (finns bara i containern / efter npm run build)
+  const publicDir = path.resolve(__dirname, '../public')
+  if (existsSync(publicDir)) {
+    app.register(fastifyStatic, { root: publicDir })
+    app.setNotFoundHandler((req, reply) => {
+      if (req.url.startsWith('/api/')) {
+        return reply.code(404).send({ error: 'finns inte' })
+      }
+      return reply.sendFile('index.html')
+    })
+  }
+
+  return app
+}

backend/src/config.js

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+export function loadConfig(env = process.env) {
+  return {
+    port: Number(env.PORT ?? 3000),
+    host: env.HOST ?? '0.0.0.0',
+    appPassword: env.APP_PASSWORD ?? '',
+    sessionSecret: env.SESSION_SECRET ?? '',
+    dataDir: env.DATA_DIR ?? '/data',
+    lidarr: {
+      url: env.LIDARR_URL ?? 'http://lidarr:8686',
+      apiKey: env.LIDARR_API_KEY ?? '',
+    },
+    jellyfin: {
+      url: env.JELLYFIN_URL ?? 'http://jellyfin:8096',
+      apiKey: env.JELLYFIN_API_KEY ?? '',
+    },
+    gemini: {
+      apiKey: env.GEMINI_API_KEY ?? '',
+      model: env.GEMINI_MODEL ?? 'gemini-2.5-flash',
+    },
+  }
+}

backend/src/server.js

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+import { loadConfig } from './config.js'
+import { buildApp } from './app.js'
+
+const config = loadConfig()
+
+if (!config.sessionSecret || config.sessionSecret.length < 32) {
+  console.error('SESSION_SECRET saknas eller är kortare än 32 tecken')
+  process.exit(1)
+}
+
+const app = buildApp(config)
+
+app.listen({ port: config.port, host: config.host }).catch((err) => {
+  app.log.error(err)
+  process.exit(1)
+})