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api/contacts.js

@@ -0,0 +1,50 @@
+import { sql, ok, fail, auth, clean, ONLINE_SECS, PREVIEW_LEN } from '../lib/db.js';
+
+export default async function handler(req, res) {
+  try {
+    const me = await auth(req, res);
+    if (!me) return;
+
+    const now = Math.floor(Date.now() / 1000);
+
+    // Alles in EINER Abfrage – auf Serverless zählt jede Round-Trip-Zeit.
+    const rows = await sql`
+      SELECT u.name, u.last_seen,
+             COALESCE(lm.ts, 0)  AS last_ts,
+             lm.text             AS last_text,
+             lm.sender           AS last_sender,
+             COALESCE(un.cnt, 0) AS unread
+      FROM users u
+      LEFT JOIN LATERAL (
+        SELECT m.ts, m.text, m.sender FROM messages m
+        WHERE (m.sender = ${me.id} AND m.recipient = u.id)
+           OR (m.sender = u.id     AND m.recipient = ${me.id})
+        ORDER BY m.id DESC LIMIT 1
+      ) lm ON TRUE
+      LEFT JOIN LATERAL (
+        SELECT COUNT(*) AS cnt FROM messages m
+        WHERE m.sender = u.id AND m.recipient = ${me.id}
+          AND m.id > COALESCE(
+            (SELECT last_id FROM reads WHERE user_id = ${me.id} AND peer_id = u.id), 0)
+      ) un ON TRUE
+      WHERE u.id <> ${me.id}
+      ORDER BY last_ts DESC, LOWER(u.name) ASC`;
+
+    const body = rows.map(r => {
+      const online = (now - Number(r.last_seen) < ONLINE_SECS) ? 1 : 0;
+
+      let preview = '';
+      if (r.last_text) {
+        let txt = r.last_text.slice(0, PREVIEW_LEN);
+        if (r.last_text.length > PREVIEW_LEN) txt += '…';
+        preview = (r.last_sender === me.id ? 'Du: ' : '') + txt;
+      }
+
+      return `USER|${clean(r.name)}|${online}|${r.unread}|${r.last_ts}|${clean(preview)}`;
+    }).join('\n');
+
+    ok(res, body ? body + '\n' : '');
+  } catch (e) {
+    fail(res, 'Serverfehler: ' + e.message);
+  }
+}