Root Cause Description
The root cause is an invalid OAuth access token being used by the graph.facebook.com service, leading to authentication failures. This malfunction caused a high rate of errors across multiple services, including NextGenSocialApiServer and PublisherSocialApiServer, which rely on graph.facebook.com for social media operations. Specifically, logs indicate that tokens were either invalid or expired, preventing successful API calls and resulting in downstream service failures. Remediation should focus on ensuring the validity and proper refresh of OAuth tokens used by graph.facebook.com.
Context
Invalid OAuth Access Token for graph.facebook.com
The graph.facebook.com service is encountering authentication errors due to invalid or expired OAuth access tokens. This is causing downstream services like NextGenSocialApiServer and PublisherSocialApiServer to fail their social sync and publish operations. Remediation should focus on implementing a robust token validation and proactive refresh mechanism.
Key Evidence:
-
[Log | Error] Facebook API authentication error | First seen: 2025-12-15 23:21:28 | Count: 1
Facebook API authentication error {"request_id":"oauth-req-2","error":"OAuthException","code":190,"message":"Invalid OAuth access token","upstream":"[graph.facebook.com](/observe/topology/a4ee2711-cd71-5430-af22-64de89d358d9)","endpoint":"https://[graph.facebook.com](/observe/topology/a4ee2711-cd71-5430-af22-64de89d358d9)/v18.0/me/accounts"} -
[Log | Warning] Unable to fetch page access tokens | First seen: 2025-12-15 23:21:33 | Count: 1
Unable to fetch page access tokens {"request_id":"oauth-req-2","error":"authentication_failed","upstream":"[graph.facebook.com](/observe/topology/a4ee2711-cd71-5430-af22-64de89d358d9)","status_code":401} -
[Log | Error] OAuth token validation failed | First seen: 2025-12-15 23:21:23 | Count: 1
OAuth token validation failed in Facebook client (code-level remediation: validate token decode/format before request) {"request_id":"oauth-req-1","caller":"facebook/client.go:234","func":"ValidateToken","handler":"HandleFacebookOAuthError","token_source":"redis","token_key":"fb:user:123:access_token","token_decode":"base64","token_parse":"opaque","error":"OAuthException","code":190,"fb_error_subcode":190,"message":"Invalid OAuth access token - Cannot parse access token","retryable":false,"action":"invalidate_cached_token_and_trigger_reauth","upstream":"[graph.facebook.com](/observe/topology/a4ee2711-cd71-5430-af22-64de89d358d9)","endpoint":"https://[graph.facebook.com](/observe/topology/a4ee2711-cd71-5430-af22-64de89d358d9)/v18.0/me"} -
[Log | Error] Token refresh failed - session expired | First seen: 2025-12-15 23:21:33 | Count: 1
Token refresh failed - session expired (code-level remediation: handle 190/460 with re-auth flow) {"request_id":"oauth-req-1","caller":"oauth/token_manager.go:171","func":"RefreshToken","handler":"HandleFacebookOAuthError","error":"OAuthException","code":190,"fb_error_subcode":460,"message":"Error validating access token: Session has expired","retryable":false,"action":"start_reauth_flow","upstream":"[graph.facebook.com](/observe/topology/a4ee2711-cd71-5430-af22-64de89d358d9)"}
Enhance OAuth Token Management and Error Handling for Facebook API
The application's integration with graph.facebook.com requires enhancements to its OAuth token management and error handling logic. The current system is experiencing failures due to invalid or expired tokens, and is not effectively refreshing them proactively or initiating re-authentication when necessary.
You might adjust the oauth/token_manager to implement a proactive token refresh mechanism. This involves checking token expiration well in advance (e.g., 24-48 hours before expiry) and attempting to refresh the token using the Facebook API. This prevents tokens from expiring during active use, which is currently indicated by the "Token refresh scheduled too late" warning.
Additionally, the facebook/client should implement more robust internal validation of OAuth tokens before making requests. The log "Invalid OAuth access token - Cannot parse access token" suggests issues with token format or integrity. You could add checks to ensure the token is valid before use. Crucially, implement specific error handling for OAuthException with code 190. For subcode 460 ("Session has expired"), the system should trigger a user re-authentication flow. For other code 190 errors, the cached token should be invalidated, and a re-authentication flow initiated to obtain a fresh token.
// Example pseudo-code for enhanced token management and error handling
// In oauth/token_manager.go
func (tm *TokenManager) ProactivelyRefresh(token *OAuthToken) error {
// Check if token expires within tm.RefreshLeadTime (e.g., 48 hours)
if time.Until(token.Expiry) < tm.RefreshLeadTime {
// Call Facebook API to refresh token
newToken, err := tm.facebookClient.Refresh(token.RefreshToken)
if err != nil { return fmt.Errorf("failed refresh: %w", err) }
tm.redisClient.Set(token.Key, newToken) // Update cached token
}
return nil
}
// In facebook/client.go
func (fc *FacebookClient) HandleOAuthError(err error, tokenKey string) error {
if fbErr, ok := err.(*OAuthException); ok && fbErr.Code == 190 {
if fbErr.Subcode == 460 { // Session has expired
// Trigger user re-authentication flow
return fmt.Errorf("session expired, re-auth needed")
}
// Invalidate cached token and trigger re-auth for other 190 errors
fc.tokenManager.InvalidateCachedToken(tokenKey)
return fmt.Errorf("invalid token, re-auth needed")
}
return err
}