Füge myTischtennis-Verbindung hinzu: Implementiere Authentifizierung, Import von TTR-Werten und speichere Verbindungsdaten sicher

server/utils/mytischtennis-connection.js

@@ -0,0 +1,44 @@
+import { promises as fs } from 'fs'
+import { encryptObject, decryptObject } from './encryption.js'
+import { getServerDataPath } from './paths.js'
+
+const FILE = getServerDataPath('mytischtennis-connection.json')
+
+function encryptionKey() {
+  const key = process.env.ENCRYPTION_KEY
+  if (!key) throw new Error('ENCRYPTION_KEY ist für die myTischtennis-Verbindung erforderlich.')
+  return key
+}
+
+export async function readMyTischtennisConnection() {
+  try {
+    const stored = JSON.parse(await fs.readFile(FILE, 'utf8'))
+    return decryptObject(stored.encrypted, encryptionKey())
+  } catch (error) {
+    if (error?.code === 'ENOENT') return null
+    throw error
+  }
+}
+
+export async function saveMyTischtennisConnection(connection) {
+  const payload = {
+    version: 1,
+    encrypted: encryptObject(connection, encryptionKey())
+  }
+  await fs.mkdir(getServerDataPath(), { recursive: true })
+  await fs.writeFile(FILE, `${JSON.stringify(payload)}\n`, { encoding: 'utf8', mode: 0o600 })
+}
+
+export function publicConnectionStatus(connection) {
+  if (!connection) return { configured: false }
+  const email = String(connection.email || '')
+  const [name, domain] = email.split('@')
+  return {
+    configured: true,
+    email: name ? `${name.slice(0, 2)}${'•'.repeat(Math.max(1, name.length - 2))}${domain ? `@${domain}` : ''}` : null,
+    association: connection.association || null,
+    clubId: connection.clubId || null,
+    lastSuccessfulImportAt: connection.lastSuccessfulImportAt || null,
+    lastImportError: connection.lastImportError || null
+  }
+}