feat: add snjs package

packages/snjs/lib/Hosts.ts

@@ -0,0 +1,40 @@
+export const APPLICATION_DEFAULT_HOSTS = [
+  'api.standardnotes.com',
+  'api-dev.standardnotes.com',
+  'sync.standardnotes.org',
+  'syncing-server-demo.standardnotes.com',
+]
+
+export const FILES_DEFAULT_HOSTS = ['files.standardnotes.com', 'files-dev.standardnotes.com']
+
+export const TRUSTED_FEATURE_HOSTS = [
+  'api-dev.standardnotes.com',
+  'api.standardnotes.com',
+  'extensions.standardnotes.com',
+  'extensions.standardnotes.org',
+  'extensions-server-dev.standardnotes.org',
+  'extensions-server-dev.standardnotes.com',
+  'features.standardnotes.com',
+]
+
+export enum ExtensionsServerURL {
+  Dev = 'https://extensions-server-dev.standardnotes.org',
+  Prod = 'https://extensions.standardnotes.org',
+}
+
+const LocalHost = 'localhost'
+
+export function isUrlFirstParty(url: string): boolean {
+  try {
+    const { host } = new URL(url)
+    return host.startsWith(LocalHost) || APPLICATION_DEFAULT_HOSTS.includes(host) || FILES_DEFAULT_HOSTS.includes(host)
+  } catch (_err) {
+    return false
+  }
+}
+
+export const PROD_OFFLINE_FEATURES_URL = 'https://api.standardnotes.com/v1/offline/features'
+
+export const LEGACY_PROD_EXT_ORIGIN = 'https://extensions.standardnotes.org'
+
+export const TRUSTED_CUSTOM_EXTENSIONS_HOSTS = ['listed.to']