Preview: Dev-Modus nur mit dev-Skript waehlbar

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/services/previewDevScript.js

@@ -0,0 +1,35 @@
+// Prueft, ob ein Repo-Branch ein dev-Skript in package.json hat (Dev-Modus nur dann sinnvoll).
+import { giteaFetch, splitRepo } from './giteaClient.js'
+
+export const cacheTtlMs = 60 * 1000
+const cache = new Map()
+
+export function clearDevScriptCache() { cache.clear() }
+
+/** true = dev-Skript vorhanden, false = kein package.json oder kein dev-Skript, null = unbekannt (Gitea-Fehler). */
+export async function repoHasDevScript(repoFullName, branch) {
+  const key = `${repoFullName}@${branch}`
+  const hit = cache.get(key)
+  if (hit && Date.now() - hit.at < cacheTtlMs) return hit.value
+  const value = await lookup(repoFullName, branch)
+  cache.set(key, { at: Date.now(), value })
+  return value
+}
+
+async function lookup(repoFullName, branch) {
+  const [owner, repo] = splitRepo(repoFullName)
+  if (!owner || !repo) return null
+  let data
+  try {
+    data = await giteaFetch(`/repos/${owner}/${repo}/contents/package.json?ref=${encodeURIComponent(branch)}`)
+  } catch (err) {
+    return err?.status === 404 ? false : null
+  }
+  try {
+    const pkg = JSON.parse(Buffer.from(data?.content || '', 'base64').toString('utf8'))
+    const dev = pkg?.scripts?.dev
+    return typeof dev === 'string' && dev.trim() !== ''
+  } catch {
+    return null
+  }
+}