mirror of
https://github.com/bulwarkmail/webmail.git
synced 2026-11-02 16:15:39 +00:00
Linus Rath
adbec718ef
The push preview route now reads the device policy of the login it serves (its scopes worked out from the login's own JMAP session, every non-personal account counted as a group) and under `pushWithoutContent` asks the mail server for the message's ids only, so sender, subject and text never reach the notification. The service worker shows "New mail" for such an answer. A policy that can't be read counts as on. The three existing push preview route tests now mock the config manager with the default policy: without it the route can't read a policy in the test environment and holds the text back, which those tests didn't mean to cover. No assertion changed.
101 lines
4.1 KiB
TypeScript
101 lines
4.1 KiB
TypeScript
/**
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* The device policies (policy.json `organisation.devices`) as the server
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* applies them itself, where it can: the push notification text
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* (app/api/push/preview) and the office editor (app/api/wopi). The browser
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* talks to the mail server directly for everything else, so those gates
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* are browser-only (lib/device-policy.ts).
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*
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* Who the caller is comes from their own JMAP session, never from the
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* browser. For these gates every non-personal account in the session
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* counts as a group (a mailbox another person shared counts too): more
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* scopes matched means more held back, the safe direction. A session that
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* can't be read counts the login address alone.
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*/
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import { createHash } from 'node:crypto';
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import { configManager } from './config-manager';
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import { DEFAULT_ORGANISATION_POLICY, type OrganisationPolicy } from './organisation-policy';
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import { resolvePolicy, type PolicySubject } from './policy-scopes';
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import { fetchJmapSession } from '@/lib/stalwart/jmap-api';
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export type ServerDevicePolicy = OrganisationPolicy['devices'];
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export interface DeviceCreds {
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serverUrl: string;
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authHeader: string;
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username: string;
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accountName?: string;
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trusted: boolean;
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}
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const TTL_MS = 5 * 60 * 1000;
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const CACHE_KEY = Symbol.for('bulwark.serverDeviceSubjects');
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// One cache per process, not per bundle copy.
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function cache(): Map<string, { at: number; subject: Promise<PolicySubject> }> {
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const g = globalThis as typeof globalThis & { [CACHE_KEY]?: Map<string, { at: number; subject: Promise<PolicySubject> }> };
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g[CACHE_KEY] ??= new Map();
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return g[CACHE_KEY];
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}
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async function readSubject(creds: DeviceCreds): Promise<PolicySubject> {
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const email = (creds.accountName || creds.username || '').trim().toLowerCase();
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const session = await fetchJmapSession(creds.serverUrl, creds.authHeader, { trusted: creds.trusted }).catch(() => null);
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const accounts = (session?.accounts ?? {}) as Record<string, { name?: string; isPersonal?: boolean }>;
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const groups = Object.values(accounts)
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.filter((account) => account?.isPersonal === false && typeof account.name === 'string' && account.name.includes('@'))
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.map((account) => account.name!.trim().toLowerCase())
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.filter((name) => name !== email)
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.sort();
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return { email, groups };
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}
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/** The caller as the device gates see them, kept for a few minutes per credential. Never rejects. */
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export function strictDeviceSubject(creds: DeviceCreds): Promise<PolicySubject> {
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const key = createHash('sha256').update(`${creds.serverUrl}\n${creds.authHeader}`).digest('hex');
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const entries = cache();
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const now = Date.now();
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const hit = entries.get(key);
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if (hit && now - hit.at < TTL_MS) return hit.subject;
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const subject = readSubject(creds);
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entries.set(key, { at: now, subject });
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if (entries.size > 1000) {
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for (const [k, v] of entries) if (now - v.at >= TTL_MS) entries.delete(k);
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}
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return subject;
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}
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/** The device policy that applies to this login. */
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export async function serverDevicePolicy(creds: DeviceCreds): Promise<ServerDevicePolicy> {
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await configManager.ensureLoaded();
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const subject = await strictDeviceSubject(creds);
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const devices = resolvePolicy(configManager.getPolicy(), subject).policy.organisation?.devices;
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return { ...DEFAULT_ORGANISATION_POLICY.devices, ...(devices ?? {}) };
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}
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/**
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* The WOPI CheckFileInfo switches for the office editor (Collabora and
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* ONLYOFFICE read these): no printing, no export or "save a copy" when
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* downloads or export are off, and the watermark.
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*/
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export function wopiDeviceInfo(devices: ServerDevicePolicy, username: string, now: Date = new Date()): Record<string, unknown> {
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const out: Record<string, unknown> = {};
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if (devices.noPrint) {
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out.DisablePrint = true;
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out.HidePrintOption = true;
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}
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if (devices.noDownloads || devices.noExport) {
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out.DisableExport = true;
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out.HideExportOption = true;
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out.HideSaveOption = true;
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out.DisableCopy = true;
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}
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if (devices.watermark) out.WatermarkText = `${username} · ${now.toISOString().slice(0, 10)}`;
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return out;
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}
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/** For tests. */
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export function clearServerDeviceSubjects(): void {
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cache().clear();
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}
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