feat: list logged-in accounts, storage quota and auth method in account settings

src/api/quota.ts

@@ -0,0 +1,55 @@
+import { jmapClient } from './jmap-client';
+import { CAPABILITIES } from './types';
+
+// RFC 9425 Quota object (Stalwart reports storage as resourceType "octets"
+// with scope "account"); older servers used a pre-RFC "mail" shape.
+interface JMAPQuota {
+  id: string;
+  resourceType?: string;
+  used?: number;
+  hardLimit?: number;
+  warnLimit?: number;
+  softLimit?: number;
+  // pre-RFC shape
+  limit?: number;
+  scope?: string;
+  types?: string[];
+  name?: string;
+}
+
+export interface MailQuota {
+  used: number;
+  total: number;
+}
+
+export function serverSupportsQuota(): boolean {
+  return Boolean(jmapClient.currentSession?.capabilities?.[CAPABILITIES.QUOTA]);
+}
+
+/**
+ * Storage usage for the primary account, or null when the server does not
+ * advertise urn:ietf:params:jmap:quota or reports no mail storage quota.
+ * Mirrors the webmail's client.getQuota().
+ */
+export async function fetchMailQuota(): Promise<MailQuota | null> {
+  if (!serverSupportsQuota()) return null;
+  try {
+    const res = await jmapClient.request(
+      [['Quota/get', { accountId: jmapClient.accountId }, '0']],
+      [CAPABILITIES.CORE, CAPABILITIES.QUOTA],
+    );
+    const [name, body] = res.methodResponses[0] ?? [];
+    if (name !== 'Quota/get') return null;
+    const quotas = (body?.list ?? []) as JMAPQuota[];
+    const coversMail = (q: JMAPQuota) =>
+      !q.types?.length || q.types.some((t) => t === 'Email' || t === 'Mail');
+    const mailQuota =
+      quotas.find((q) => q.resourceType === 'octets' && coversMail(q))
+      || quotas.find((q) => q.resourceType === 'mail' || q.scope === 'mail');
+    if (!mailQuota) return null;
+    const total = mailQuota.hardLimit ?? mailQuota.limit ?? 0;
+    return { used: mailQuota.used ?? 0, total };
+  } catch {
+    return null;
+  }
+}