feat(ext/sw): router/content-callable handlers with origin derivation

extension/src/service-worker/router/content-callable.ts

@@ -0,0 +1,116 @@
+/// Content-script-callable message handlers.
+///
+/// Origin is always derived from sender.tab.url — never trust fields on msg.
+/// Router has already verified sender.frameId === 0 (top-frame only) and
+/// sender.tab !== undefined.
+
+import type { ContentMessage, Response } from '../../shared/messages';
+import type { Manifest } from '../../shared/types';
+import type { GitHost } from '../git-host';
+import * as vault from '../vault';
+import * as session from '../session';
+
+export interface ContentState {
+  manifest: Manifest | null;
+  gitHost: GitHost | null;
+}
+
+export async function handle(
+  msg: ContentMessage,
+  state: ContentState,
+  sender: chrome.runtime.MessageSender,
+): Promise<Response> {
+  const senderHost = safeHostname(sender.tab?.url ?? '');
+  if (!senderHost) return { ok: false, error: 'invalid_sender_url' };
+
+  switch (msg.type) {
+    case 'get_autofill_candidates': {
+      if (!state.manifest) return { ok: false, error: 'vault_locked' };
+      return {
+        ok: true,
+        data: { candidates: vault.findByHostname(state.manifest, senderHost) },
+      };
+    }
+
+    case 'get_credentials': {
+      const handle = session.getCurrent();
+      if (!handle || !state.gitHost || !state.manifest) return { ok: false, error: 'vault_locked' };
+
+      const item = await vault.fetchAndDecryptItem(state.gitHost, handle, msg.id);
+      if (item.core.type !== 'login') return { ok: false, error: 'not_a_login' };
+      const itemHost = safeHostname(item.core.url ?? '');
+      if (!itemHost || itemHost !== senderHost) return { ok: false, error: 'origin_mismatch' };
+
+      // TOFU origin-ack check (VaultSettings.autofill_origin_acks):
+      const settings = await vault.fetchAndDecryptSettings(state.gitHost, handle);
+      const acks = settings.autofill_origin_acks ?? {};
+      if (!(senderHost in acks)) {
+        return { ok: true, data: { requires_ack: true, hostname: senderHost } };
+      }
+
+      return {
+        ok: true,
+        data: {
+          username: item.core.username ?? '',
+          password: item.core.password ?? '',
+        },
+      };
+    }
+
+    case 'check_credential': {
+      const handle = session.getCurrent();
+      if (!handle || !state.gitHost || !state.manifest) {
+        return { ok: true, data: { action: 'skip' } };
+      }
+
+      // Settings-gating: capture off or site blacklisted → skip.
+      const captureSettings = await loadDeviceSettings();
+      if (!captureSettings.captureEnabled) return { ok: true, data: { action: 'skip' } };
+
+      const blacklist = await loadBlacklist();
+      if (blacklist.includes(senderHost)) return { ok: true, data: { action: 'skip' } };
+
+      const candidates = vault.findByHostname(state.manifest, senderHost);
+      if (candidates.length === 0) return { ok: true, data: { action: 'save' } };
+
+      for (const [itemId, entry] of candidates) {
+        if (entry.type !== 'login') continue;
+        const full = await vault.fetchAndDecryptItem(state.gitHost, handle, itemId);
+        if (full.core.type !== 'login') continue;
+        if (full.core.username === msg.username) {
+          if (full.core.password === msg.password) return { ok: true, data: { action: 'skip' } };
+          return { ok: true, data: { action: 'update', entryId: itemId, entryName: entry.title } };
+        }
+      }
+      return { ok: true, data: { action: 'save' } };
+    }
+
+    case 'blacklist_site': {
+      const bl = await loadBlacklist();
+      if (!bl.includes(senderHost)) {
+        bl.push(senderHost);
+        await saveBlacklist(bl);
+      }
+      return { ok: true };
+    }
+  }
+}
+
+async function loadDeviceSettings(): Promise<{ captureEnabled: boolean; captureStyle: 'bar' | 'toast' }> {
+  const r = await chrome.storage.local.get('relicarioSettings');
+  return (r.relicarioSettings as { captureEnabled: boolean; captureStyle: 'bar' | 'toast' })
+      ?? { captureEnabled: false, captureStyle: 'bar' };
+}
+
+async function loadBlacklist(): Promise<string[]> {
+  const r = await chrome.storage.local.get('captureBlacklist');
+  return (r.captureBlacklist as string[]) ?? [];
+}
+
+async function saveBlacklist(list: string[]): Promise<void> {
+  await chrome.storage.local.set({ captureBlacklist: list });
+}
+
+function safeHostname(url: string): string | undefined {
+  try { return new URL(url).hostname; } catch { return undefined; }
+}