# All files / src/agent/credentials default-credential-manager.ts

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     /**
     * Default Account Credential Manager
     *
     * File-based adapter implementing AccountCredentialManager port.
     * Reads/writes credentials from ~/.cw/accounts/<uuid>/.credentials.json
     * and emits events on credential state changes.
     */

    import { readFileSync, existsSync, writeFileSync, mkdirSync } from 'node:fs';
    import { join, dirname } from 'node:path';
    import type { EventBus } from '../../events/index.js';
    import type {
      AccountCredentialManager,
      OAuthCredentials,
      RefreshResult,
      CredentialValidationResult,
    } from './types.js';
    import type {
      AccountCredentialsRefreshedEvent,
      AccountCredentialsExpiredEvent,
      AccountCredentialsValidatedEvent,
    } from '../../events/types.js';
    import { createModuleLogger } from '../../logger/index.js';

    const log = createModuleLogger('credential-manager');

    /** Anthropic OAuth token refresh endpoint */
    const TOKEN_REFRESH_URL = 'https://console.anthropic.com/v1/oauth/token';

    /** OAuth client ID for Claude CLI */
    const OAUTH_CLIENT_ID = '9d1c250a-e61b-44d9-88ed-5944d1962f5e';

    /** Buffer before expiry to trigger refresh (5 minutes) */
    const TOKEN_REFRESH_BUFFER_MS = 300_000;

    /**
     * DefaultAccountCredentialManager - File-based credential management with event emission.
     *
     * Implements the AccountCredentialManager port for managing OAuth credentials
     * stored in account config directories.
     */
    export class DefaultAccountCredentialManager implements AccountCredentialManager {
      constructor(private eventBus?: EventBus) {}

      /**
       * Read credentials from a config directory.
       */
      read(configDir: string): OAuthCredentials | null {
        try {
          const credPath = join(configDir, '.credentials.json');
          if (!existsSync(credPath)) return null;

          const raw = readFileSync(credPath, 'utf-8');
          const parsed = JSON.parse(raw);
          const oauth = parsed.claudeAiOauth;

          if (!oauth || !oauth.accessToken) return null;

          return {
            accessToken: oauth.accessToken,
            refreshToken: oauth.refreshToken ?? null,
            expiresAt: oauth.expiresAt ?? null,
            subscriptionType: oauth.subscriptionType ?? null,
            rateLimitTier: oauth.rateLimitTier ?? null,
          };
        } catch {
          return null;
        }
      }

      /**
       * Check if credentials are expired or about to expire.
       */
      isExpired(credentials: OAuthCredentials): boolean {
        if (!credentials.expiresAt) return false; // Setup tokens without expiry are treated as non-expired
        return credentials.expiresAt < Date.now() + TOKEN_REFRESH_BUFFER_MS;
      }

      /**
       * Refresh an access token using the refresh token.
       */
      async refresh(configDir: string, refreshToken: string): Promise<RefreshResult | null> {
        try {
          const response = await fetch(TOKEN_REFRESH_URL, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
              grant_type: 'refresh_token',
              refresh_token: refreshToken,
              client_id: OAUTH_CLIENT_ID,
              scope: 'user:inference user:profile',
            }),
          });

          if (!response.ok) {
            log.warn({ configDir, status: response.status }, 'token refresh failed');
            return null;
          }

          const data = await response.json();
          return {
            accessToken: data.access_token,
            refreshToken: data.refresh_token,
            expiresIn: data.expires_in,
          };
        } catch (err) {
          log.error({ configDir, err: err instanceof Error ? err.message : String(err) }, 'token refresh error');
          return null;
        }
      }

      /**
       * Write updated credentials to the config directory.
       */
      write(
        configDir: string,
        accessToken: string,
        refreshToken: string,
        expiresIn: number,
      ): void {
        const credPath = join(configDir, '.credentials.json');

        // Read existing credentials to preserve other fields
        let existing: Record<string, unknown> = {};
        try {
          if (existsSync(credPath)) {
            existing = JSON.parse(readFileSync(credPath, 'utf-8'));
          }
        } catch {
          // Start fresh if can't read
        }

        // Calculate expiry in milliseconds
        const nowMs = Date.now();
        const expiresAt = nowMs + expiresIn * 1000;

        // Update claudeAiOauth section
        const claudeAiOauth = (existing.claudeAiOauth as Record<string, unknown>) ?? {};
        claudeAiOauth.accessToken = accessToken;
        claudeAiOauth.refreshToken = refreshToken;
        claudeAiOauth.expiresAt = expiresAt;
        existing.claudeAiOauth = claudeAiOauth;

        // Ensure directory exists
        mkdirSync(dirname(credPath), { recursive: true });

        // Write back (compact JSON for consistency)
        writeFileSync(credPath, JSON.stringify(existing));
        log.debug({ configDir }, 'credentials written after token refresh');
      }

      /**
       * Ensure credentials are valid, refreshing if needed.
       */
      async ensureValid(configDir: string, accountId?: string): Promise<CredentialValidationResult> {
        const credentials = this.read(configDir);

        if (!credentials) {
          log.warn({ configDir, accountId }, 'no credentials found');
          this.emitExpired(accountId, 'credentials_missing', 'Credentials file not found');
          return {
            valid: false,
            credentials: null,
            error: 'Credentials file not found',
            refreshed: false,
          };
        }

        if (!this.isExpired(credentials)) {
          log.debug({ configDir, accountId }, 'credentials valid, no refresh needed');
          this.emitValidated(accountId, true, credentials.expiresAt, false);
          return {
            valid: true,
            credentials,
            error: null,
            refreshed: false,
          };
        }

        // Credentials expired — attempt refresh if we have a refresh token
        if (!credentials.refreshToken) {
          log.warn({ configDir, accountId }, 'setup token expired, no refresh token available');
          this.emitExpired(accountId, 'token_expired', 'Setup token expired, no refresh token available');
          return {
            valid: false,
            credentials: null,
            error: 'Setup token expired, no refresh token available',
            refreshed: false,
          };
        }

        log.info({ configDir, accountId }, 'credentials expired, refreshing');
        const previousExpiresAt = credentials.expiresAt;
        const refreshed = await this.refresh(configDir, credentials.refreshToken);

        if (!refreshed) {
          log.error({ configDir, accountId }, 'failed to refresh credentials');
          this.emitExpired(accountId, 'refresh_failed', 'Token refresh failed');
          return {
            valid: false,
            credentials: null,
            error: 'Token refresh failed',
            refreshed: false,
          };
        }

        // Write refreshed credentials
        const newRefreshToken = refreshed.refreshToken || credentials.refreshToken;
        this.write(configDir, refreshed.accessToken, newRefreshToken, refreshed.expiresIn);

        const newExpiresAt = Date.now() + refreshed.expiresIn * 1000;
        log.info({ configDir, accountId, expiresIn: refreshed.expiresIn }, 'credentials refreshed');

        this.emitRefreshed(accountId, newExpiresAt, previousExpiresAt);
        this.emitValidated(accountId, true, newExpiresAt, true);

        // Read back updated credentials
        const updatedCredentials = this.read(configDir);
        return {
          valid: true,
          credentials: updatedCredentials,
          error: null,
          refreshed: true,
        };
      }

      /**
       * Validate credentials without attempting refresh.
       */
      async validate(configDir: string, accountId?: string): Promise<CredentialValidationResult> {
        const credentials = this.read(configDir);

        if (!credentials) {
          this.emitValidated(accountId, false, null, false);
          return {
            valid: false,
            credentials: null,
            error: 'Credentials file not found',
            refreshed: false,
          };
        }

        const expired = this.isExpired(credentials);
        this.emitValidated(accountId, !expired, credentials.expiresAt, false);

        if (expired) {
          return {
            valid: false,
            credentials,
            error: 'Token expired',
            refreshed: false,
          };
        }

        return {
          valid: true,
          credentials,
          error: null,
          refreshed: false,
        };
      }

      /**
       * Emit credentials refreshed event.
       */
      private emitRefreshed(
        accountId: string | undefined,
        expiresAt: number,
        previousExpiresAt: number | null,
      ): void {
        if (!this.eventBus) return;

        const event: AccountCredentialsRefreshedEvent = {
          type: 'account:credentials_refreshed',
          timestamp: new Date(),
          payload: {
            accountId: accountId ?? null,
            expiresAt,
            previousExpiresAt,
          },
        };
        this.eventBus.emit(event);
      }

      /**
       * Emit credentials expired event.
       */
      private emitExpired(
        accountId: string | undefined,
        reason: 'token_expired' | 'refresh_failed' | 'credentials_missing',
        error: string | null,
      ): void {
        if (!this.eventBus) return;

        const event: AccountCredentialsExpiredEvent = {
          type: 'account:credentials_expired',
          timestamp: new Date(),
          payload: {
            accountId: accountId ?? null,
            reason,
            error,
          },
        };
        this.eventBus.emit(event);
      }

      /**
       * Emit credentials validated event.
       */
      private emitValidated(
        accountId: string | undefined,
        valid: boolean,
        expiresAt: number | null,
        wasRefreshed: boolean,
      ): void {
        if (!this.eventBus) return;

        const event: AccountCredentialsValidatedEvent = {
          type: 'account:credentials_validated',
          timestamp: new Date(),
          payload: {
            accountId: accountId ?? null,
            valid,
            expiresAt,
            wasRefreshed,
          },
        };
        this.eventBus.emit(event);
      }
    }