init claude-code

2026-04-01 17:32:37 +02:00
commit 73b208c009
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+/**
+ * Remote Managed Settings Service
+ *
+ * Manages fetching, caching, and validation of remote-managed settings
+ * for enterprise customers. Uses checksum-based validation to minimize
+ * network traffic and provides graceful degradation on failures.
+ *
+ * Eligibility:
+ * - Console users (API key): All eligible
+ * - OAuth users (Claude.ai): Only Enterprise/C4E and Team subscribers are eligible
+ * - API fails open (non-blocking) - if fetch fails, continues without remote settings
+ * - API returns empty settings for users without managed settings
+ */
+
+import axios from 'axios'
+import { createHash } from 'crypto'
+import { open, unlink } from 'fs/promises'
+import { getOauthConfig, OAUTH_BETA_HEADER } from '../../constants/oauth.js'
+import {
+  checkAndRefreshOAuthTokenIfNeeded,
+  getAnthropicApiKeyWithSource,
+  getClaudeAIOAuthTokens,
+} from '../../utils/auth.js'
+import { registerCleanup } from '../../utils/cleanupRegistry.js'
+import { logForDebugging } from '../../utils/debug.js'
+import { classifyAxiosError, getErrnoCode } from '../../utils/errors.js'
+import { settingsChangeDetector } from '../../utils/settings/changeDetector.js'
+import {
+  type SettingsJson,
+  SettingsSchema,
+} from '../../utils/settings/types.js'
+import { sleep } from '../../utils/sleep.js'
+import { jsonStringify } from '../../utils/slowOperations.js'
+import { getClaudeCodeUserAgent } from '../../utils/userAgent.js'
+import { getRetryDelay } from '../api/withRetry.js'
+import {
+  checkManagedSettingsSecurity,
+  handleSecurityCheckResult,
+} from './securityCheck.jsx'
+import { isRemoteManagedSettingsEligible, resetSyncCache } from './syncCache.js'
+import {
+  getRemoteManagedSettingsSyncFromCache,
+  getSettingsPath,
+  setSessionCache,
+} from './syncCacheState.js'
+import {
+  type RemoteManagedSettingsFetchResult,
+  RemoteManagedSettingsResponseSchema,
+} from './types.js'
+
+// Constants
+const SETTINGS_TIMEOUT_MS = 10000 // 10 seconds for settings fetch
+const DEFAULT_MAX_RETRIES = 5
+const POLLING_INTERVAL_MS = 60 * 60 * 1000 // 1 hour
+
+// Background polling state
+let pollingIntervalId: ReturnType<typeof setInterval> | null = null
+
+// Promise that resolves when initial remote settings loading completes
+// This allows other systems to wait for remote settings before initializing
+let loadingCompletePromise: Promise<void> | null = null
+let loadingCompleteResolve: (() => void) | null = null
+
+// Timeout for the loading promise to prevent deadlocks if loadRemoteManagedSettings() is never called
+// (e.g., in Agent SDK tests that don't go through main.tsx)
+const LOADING_PROMISE_TIMEOUT_MS = 30000 // 30 seconds
+
+/**
+ * Initialize the loading promise for remote managed settings
+ * This should be called early (e.g., in init.ts) to allow other systems
+ * to await remote settings loading even if loadRemoteManagedSettings()
+ * hasn't been called yet.
+ *
+ * Only creates the promise if the user is eligible for remote settings.
+ * Includes a timeout to prevent deadlocks if loadRemoteManagedSettings() is never called.
+ */
+export function initializeRemoteManagedSettingsLoadingPromise(): void {
+  if (loadingCompletePromise) {
+    return
+  }
+
+  if (isRemoteManagedSettingsEligible()) {
+    loadingCompletePromise = new Promise(resolve => {
+      loadingCompleteResolve = resolve
+
+      // Set a timeout to resolve the promise even if loadRemoteManagedSettings() is never called
+      // This prevents deadlocks in Agent SDK tests and other non-CLI contexts
+      setTimeout(() => {
+        if (loadingCompleteResolve) {
+          logForDebugging(
+            'Remote settings: Loading promise timed out, resolving anyway',
+          )
+          loadingCompleteResolve()
+          loadingCompleteResolve = null
+        }
+      }, LOADING_PROMISE_TIMEOUT_MS)
+    })
+  }
+}
+
+/**
+ * Get the remote settings API endpoint
+ * Uses the OAuth config base API URL
+ */
+function getRemoteManagedSettingsEndpoint() {
+  return `${getOauthConfig().BASE_API_URL}/api/claude_code/settings`
+}
+
+/**
+ * Recursively sort all keys in an object to match Python's json.dumps(sort_keys=True)
+ */
+function sortKeysDeep(obj: unknown): unknown {
+  if (Array.isArray(obj)) {
+    return obj.map(sortKeysDeep)
+  }
+  if (obj !== null && typeof obj === 'object') {
+    const sorted: Record<string, unknown> = {}
+    for (const key of Object.keys(obj).sort()) {
+      sorted[key] = sortKeysDeep((obj as Record<string, unknown>)[key])
+    }
+    return sorted
+  }
+  return obj
+}
+
+/**
+ * Compute checksum from settings content for HTTP caching
+ * Must match server's Python: json.dumps(settings, sort_keys=True, separators=(",", ":"))
+ * Exported for testing to verify compatibility with server-side implementation
+ */
+export function computeChecksumFromSettings(settings: SettingsJson): string {
+  const sorted = sortKeysDeep(settings)
+  // No spaces after separators to match Python's separators=(",", ":")
+  const normalized = jsonStringify(sorted)
+  const hash = createHash('sha256').update(normalized).digest('hex')
+  return `sha256:${hash}`
+}
+
+/**
+ * Check if the current user is eligible for remote managed settings
+ * This is the public API for other systems to check eligibility
+ * Used to determine if they should wait for remote settings to load
+ */
+export function isEligibleForRemoteManagedSettings(): boolean {
+  return isRemoteManagedSettingsEligible()
+}
+
+/**
+ * Wait for the initial remote settings loading to complete
+ * Returns immediately if:
+ * - User is not eligible for remote settings
+ * - Loading has already completed
+ * - Loading was never started
+ */
+export async function waitForRemoteManagedSettingsToLoad(): Promise<void> {
+  if (loadingCompletePromise) {
+    await loadingCompletePromise
+  }
+}
+
+/**
+ * Get auth headers for remote settings without calling getSettings()
+ * This avoids circular dependencies during settings loading
+ * Supports both API key and OAuth authentication
+ */
+function getRemoteSettingsAuthHeaders(): {
+  headers: Record<string, string>
+  error?: string
+} {
+  // Try API key first (for Console users)
+  // Skip apiKeyHelper to avoid circular dependency with getSettings()
+  // Wrap in try-catch because getAnthropicApiKeyWithSource throws in CI/test environments
+  try {
+    const { key: apiKey } = getAnthropicApiKeyWithSource({
+      skipRetrievingKeyFromApiKeyHelper: true,
+    })
+    if (apiKey) {
+      return {
+        headers: {
+          'x-api-key': apiKey,
+        },
+      }
+    }
+  } catch {
+    // No API key available - continue to check OAuth
+  }
+
+  // Fall back to OAuth tokens (for Claude.ai users)
+  const oauthTokens = getClaudeAIOAuthTokens()
+  if (oauthTokens?.accessToken) {
+    return {
+      headers: {
+        Authorization: `Bearer ${oauthTokens.accessToken}`,
+        'anthropic-beta': OAUTH_BETA_HEADER,
+      },
+    }
+  }
+
+  return {
+    headers: {},
+    error: 'No authentication available',
+  }
+}
+
+/**
+ * Fetch remote settings with retry logic and exponential backoff
+ * Uses existing codebase retry utilities for consistency
+ */
+async function fetchWithRetry(
+  cachedChecksum?: string,
+): Promise<RemoteManagedSettingsFetchResult> {
+  let lastResult: RemoteManagedSettingsFetchResult | null = null
+
+  for (let attempt = 1; attempt <= DEFAULT_MAX_RETRIES + 1; attempt++) {
+    lastResult = await fetchRemoteManagedSettings(cachedChecksum)
+
+    // Return immediately on success
+    if (lastResult.success) {
+      return lastResult
+    }
+
+    // Don't retry if the error is not retryable (e.g., auth errors)
+    if (lastResult.skipRetry) {
+      return lastResult
+    }
+
+    // If we've exhausted retries, return the last error
+    if (attempt > DEFAULT_MAX_RETRIES) {
+      return lastResult
+    }
+
+    // Calculate delay and wait before next retry
+    const delayMs = getRetryDelay(attempt)
+    logForDebugging(
+      `Remote settings: Retry ${attempt}/${DEFAULT_MAX_RETRIES} after ${delayMs}ms`,
+    )
+    await sleep(delayMs)
+  }
+
+  // Should never reach here, but TypeScript needs it
+  return lastResult!
+}
+
+/**
+ * Fetch the full remote settings (single attempt, no retries)
+ * Optionally pass a cached checksum for ETag-based caching
+ */
+async function fetchRemoteManagedSettings(
+  cachedChecksum?: string,
+): Promise<RemoteManagedSettingsFetchResult> {
+  try {
+    // Ensure OAuth token is fresh before fetching settings
+    // This prevents 401 errors from stale cached tokens
+    await checkAndRefreshOAuthTokenIfNeeded()
+
+    // Use local auth header getter to avoid circular dependency with getSettings()
+    const authHeaders = getRemoteSettingsAuthHeaders()
+    if (authHeaders.error) {
+      // Auth errors should not be retried - return a special flag to skip retries
+      return {
+        success: false,
+        error: `Authentication required for remote settings`,
+        skipRetry: true,
+      }
+    }
+
+    const endpoint = getRemoteManagedSettingsEndpoint()
+    const headers: Record<string, string> = {
+      ...authHeaders.headers,
+      'User-Agent': getClaudeCodeUserAgent(),
+    }
+
+    // Add If-None-Match header for ETag-based caching
+    if (cachedChecksum) {
+      headers['If-None-Match'] = `"${cachedChecksum}"`
+    }
+
+    const response = await axios.get(endpoint, {
+      headers,
+      timeout: SETTINGS_TIMEOUT_MS,
+      // Allow 204, 304, and 404 responses without treating them as errors.
+      // 204/404 are returned when no settings exist for the user or the feature flag is off.
+      validateStatus: status =>
+        status === 200 || status === 204 || status === 304 || status === 404,
+    })
+
+    // Handle 304 Not Modified - cached version is still valid
+    if (response.status === 304) {
+      logForDebugging('Remote settings: Using cached settings (304)')
+      return {
+        success: true,
+        settings: null, // Signal that cache is valid
+        checksum: cachedChecksum,
+      }
+    }
+
+    // Handle 204 No Content / 404 Not Found - no settings exist or feature flag is off.
+    // Return empty object (not null) so callers don't fall back to cached settings.
+    if (response.status === 204 || response.status === 404) {
+      logForDebugging(`Remote settings: No settings found (${response.status})`)
+      return {
+        success: true,
+        settings: {},
+        checksum: undefined,
+      }
+    }
+
+    const parsed = RemoteManagedSettingsResponseSchema().safeParse(
+      response.data,
+    )
+    if (!parsed.success) {
+      logForDebugging(
+        `Remote settings: Invalid response format - ${parsed.error.message}`,
+      )
+      return {
+        success: false,
+        error: 'Invalid remote settings format',
+      }
+    }
+
+    // Full validation of settings structure
+    const settingsValidation = SettingsSchema().safeParse(parsed.data.settings)
+    if (!settingsValidation.success) {
+      logForDebugging(
+        `Remote settings: Settings validation failed - ${settingsValidation.error.message}`,
+      )
+      return {
+        success: false,
+        error: 'Invalid settings structure',
+      }
+    }
+
+    logForDebugging('Remote settings: Fetched successfully')
+    return {
+      success: true,
+      settings: settingsValidation.data,
+      checksum: parsed.data.checksum,
+    }
+  } catch (error) {
+    const { kind, status, message } = classifyAxiosError(error)
+    if (status === 404) {
+      // 404 means no remote settings configured
+      return { success: true, settings: {}, checksum: '' }
+    }
+    switch (kind) {
+      case 'auth':
+        // Auth errors (401, 403) should not be retried - the API key doesn't have access
+        return {
+          success: false,
+          error: 'Not authorized for remote settings',
+          skipRetry: true,
+        }
+      case 'timeout':
+        return { success: false, error: 'Remote settings request timeout' }
+      case 'network':
+        return { success: false, error: 'Cannot connect to server' }
+      default:
+        return { success: false, error: message }
+    }
+  }
+}
+
+/**
+ * Save remote settings to file
+ * Stores raw settings JSON (checksum is computed on-demand when needed)
+ */
+async function saveSettings(settings: SettingsJson): Promise<void> {
+  try {
+    const path = getSettingsPath()
+    const handle = await open(path, 'w', 0o600)
+    try {
+      await handle.writeFile(jsonStringify(settings, null, 2), {
+        encoding: 'utf-8',
+      })
+      await handle.datasync()
+    } finally {
+      await handle.close()
+    }
+    logForDebugging(`Remote settings: Saved to ${path}`)
+  } catch (error) {
+    logForDebugging(
+      `Remote settings: Failed to save - ${error instanceof Error ? error.message : 'unknown error'}`,
+    )
+    // Ignore save errors - we'll refetch on next startup
+  }
+}
+
+/**
+ * Clear all remote settings (session, persistent, and stop polling)
+ */
+export async function clearRemoteManagedSettingsCache(): Promise<void> {
+  // Stop background polling
+  stopBackgroundPolling()
+
+  // Clear session cache
+  resetSyncCache()
+
+  // Clear loading promise state
+  loadingCompletePromise = null
+  loadingCompleteResolve = null
+
+  try {
+    const path = getSettingsPath()
+    await unlink(path)
+  } catch {
+    // Ignore errors when clearing file (ENOENT is expected)
+  }
+}
+
+/**
+ * Fetch and load remote settings with file caching
+ * Internal function that handles the full load/fetch logic
+ * Fails open - returns null if fetch fails and no cache exists
+ */
+async function fetchAndLoadRemoteManagedSettings(): Promise<SettingsJson | null> {
+  if (!isRemoteManagedSettingsEligible()) {
+    return null
+  }
+
+  // Load cached settings from file
+  const cachedSettings = getRemoteManagedSettingsSyncFromCache()
+
+  // Compute checksum locally from cached settings for HTTP caching validation
+  const cachedChecksum = cachedSettings
+    ? computeChecksumFromSettings(cachedSettings)
+    : undefined
+
+  try {
+    // Fetch settings from API with retry logic
+    const result = await fetchWithRetry(cachedChecksum)
+
+    if (!result.success) {
+      // On fetch failure, use stale file if available (graceful degradation)
+      if (cachedSettings) {
+        logForDebugging(
+          'Remote settings: Using stale cache after fetch failure',
+        )
+        setSessionCache(cachedSettings)
+        return cachedSettings
+      }
+      // No cache available - fail open, continue without remote settings
+      return null
+    }
+
+    // Handle 304 Not Modified - cached settings are still valid
+    if (result.settings === null && cachedSettings) {
+      logForDebugging('Remote settings: Cache still valid (304 Not Modified)')
+      setSessionCache(cachedSettings)
+      return cachedSettings
+    }
+
+    // Save new settings to file (only if non-empty)
+    const newSettings = result.settings || {}
+    const hasContent = Object.keys(newSettings).length > 0
+
+    if (hasContent) {
+      // Check for dangerous settings changes before applying
+      const securityResult = await checkManagedSettingsSecurity(
+        cachedSettings,
+        newSettings,
+      )
+      if (!handleSecurityCheckResult(securityResult)) {
+        // User rejected - don't apply settings, return cached or null
+        logForDebugging(
+          'Remote settings: User rejected new settings, using cached settings',
+        )
+        return cachedSettings
+      }
+
+      setSessionCache(newSettings)
+      await saveSettings(newSettings)
+      logForDebugging('Remote settings: Applied new settings successfully')
+      return newSettings
+    }
+
+    // Empty settings (404 response) - delete cached file if it exists
+    // This ensures stale settings don't persist when a user's remote settings are removed
+    setSessionCache(newSettings)
+    try {
+      const path = getSettingsPath()
+      await unlink(path)
+      logForDebugging('Remote settings: Deleted cached file (404 response)')
+    } catch (e) {
+      const code = getErrnoCode(e)
+      if (code !== 'ENOENT') {
+        logForDebugging(
+          `Remote settings: Failed to delete cached file - ${e instanceof Error ? e.message : 'unknown error'}`,
+        )
+      }
+    }
+    return newSettings
+  } catch {
+    // On any error, use stale file if available (graceful degradation)
+    if (cachedSettings) {
+      logForDebugging('Remote settings: Using stale cache after error')
+      setSessionCache(cachedSettings)
+      return cachedSettings
+    }
+
+    // No cache available - fail open, continue without remote settings
+    return null
+  }
+}
+
+/**
+ * Load remote settings during CLI initialization
+ * Fails open - if fetch fails, continues without remote settings
+ * Also starts background polling to pick up settings changes mid-session
+ *
+ * This function sets up a promise that other systems can await via
+ * waitForRemoteManagedSettingsToLoad() to ensure they don't initialize
+ * until remote settings have been fetched.
+ */
+export async function loadRemoteManagedSettings(): Promise<void> {
+  // Set up the promise for other systems to wait on
+  // Only if the user is eligible for remote settings AND promise not already set up
+  // (initializeRemoteManagedSettingsLoadingPromise may have been called earlier)
+  if (isRemoteManagedSettingsEligible() && !loadingCompletePromise) {
+    loadingCompletePromise = new Promise(resolve => {
+      loadingCompleteResolve = resolve
+    })
+  }
+
+  // Cache-first: if we have cached settings on disk, apply them and unblock
+  // waiters immediately. The fetch still runs below; notifyChange fires once,
+  // after the fetch, as before. Saves the ~77ms fetch-wait on print-mode startup.
+  // getRemoteManagedSettingsSyncFromCache has the eligibility guard and populates
+  // the session cache internally — no need to call setSessionCache here.
+  if (getRemoteManagedSettingsSyncFromCache() && loadingCompleteResolve) {
+    loadingCompleteResolve()
+    loadingCompleteResolve = null
+  }
+
+  try {
+    const settings = await fetchAndLoadRemoteManagedSettings()
+
+    // Start background polling to pick up settings changes mid-session
+    if (isRemoteManagedSettingsEligible()) {
+      startBackgroundPolling()
+    }
+
+    // Trigger hot-reload if settings were loaded (new or from cache).
+    // notifyChange resets the settings cache internally before iterating
+    // listeners — env vars, telemetry, and permissions update on next read.
+    if (settings !== null) {
+      settingsChangeDetector.notifyChange('policySettings')
+    }
+  } finally {
+    // Always resolve the promise, even if fetch failed (fail-open)
+    if (loadingCompleteResolve) {
+      loadingCompleteResolve()
+      loadingCompleteResolve = null
+    }
+  }
+}
+
+/**
+ * Refresh remote settings asynchronously (for auth state changes)
+ * This is used when login/logout occurs
+ * Fails open - if fetch fails, continues without remote settings
+ */
+export async function refreshRemoteManagedSettings(): Promise<void> {
+  // Clear caches first
+  await clearRemoteManagedSettingsCache()
+
+  // If not enabled, notify that policy settings changed (to empty)
+  if (!isRemoteManagedSettingsEligible()) {
+    settingsChangeDetector.notifyChange('policySettings')
+    return
+  }
+
+  // Try to load new settings (fails open if fetch fails)
+  await fetchAndLoadRemoteManagedSettings()
+  logForDebugging('Remote settings: Refreshed after auth change')
+
+  // Notify listeners. notifyChange resets the settings cache internally;
+  // this triggers hot-reload (AppState update, env var application, etc.)
+  settingsChangeDetector.notifyChange('policySettings')
+}
+
+/**
+ * Background polling callback - fetches settings and triggers hot-reload if changed
+ */
+async function pollRemoteSettings(): Promise<void> {
+  if (!isRemoteManagedSettingsEligible()) {
+    return
+  }
+
+  // Get current cached settings for comparison
+  const prevCache = getRemoteManagedSettingsSyncFromCache()
+  const previousSettings = prevCache ? jsonStringify(prevCache) : null
+
+  try {
+    await fetchAndLoadRemoteManagedSettings()
+
+    // Check if settings actually changed
+    const newCache = getRemoteManagedSettingsSyncFromCache()
+    const newSettings = newCache ? jsonStringify(newCache) : null
+    if (newSettings !== previousSettings) {
+      logForDebugging('Remote settings: Changed during background poll')
+      settingsChangeDetector.notifyChange('policySettings')
+    }
+  } catch {
+    // Don't fail closed for background polling - just continue
+  }
+}
+
+/**
+ * Start background polling for remote settings
+ * Polls every hour to pick up settings changes mid-session
+ */
+export function startBackgroundPolling(): void {
+  if (pollingIntervalId !== null) {
+    return
+  }
+
+  if (!isRemoteManagedSettingsEligible()) {
+    return
+  }
+
+  pollingIntervalId = setInterval(() => {
+    void pollRemoteSettings()
+  }, POLLING_INTERVAL_MS)
+  pollingIntervalId.unref()
+
+  // Register cleanup to stop polling on shutdown
+  registerCleanup(async () => stopBackgroundPolling())
+}
+
+/**
+ * Stop background polling for remote settings
+ */
+export function stopBackgroundPolling(): void {
+  if (pollingIntervalId !== null) {
+    clearInterval(pollingIntervalId)
+    pollingIntervalId = null
+  }
+}