Function extractAPITargetHost

pkg/workflow/engine_api_targets.go:35–72

extractAPITargetHost extracts the hostname from a custom API base URL in engine.env. This supports custom OpenAI-compatible or Anthropic-compatible endpoints (e.g., internal LLM routers, Azure OpenAI) while preserving AWF's credential isolation and firewall features. The function: 1. Checks if the

(workflowData *WorkflowData, envVar string)

//	extractAPITargetHost(workflowData, "OPENAI_BASE_URL")
//	// Returns: "llm-router.internal.example.com"
func extractAPITargetHost(workflowData *WorkflowData, envVar string) string {
	// Check if engine config and env are available
	if workflowData == nil || workflowData.EngineConfig == nil || workflowData.EngineConfig.Env == nil {
		return ""
	}

	// Get the custom base URL from engine.env
	baseURL, exists := workflowData.EngineConfig.Env[envVar]
	if !exists || baseURL == "" {
		return ""
	}

	// Extract hostname from URL
	// URLs can be:
	// - "https://llm-router.internal.example.com/v1" → "llm-router.internal.example.com"
	// - "http://localhost:8080/v1" → "localhost:8080"
	// - "api.openai.com" → "api.openai.com" (treated as hostname)

	// Remove protocol prefix if present
	host := baseURL
	if idx := strings.Index(host, "://"); idx != -1 {
		host = host[idx+3:]
	}

	// Remove path suffix if present (everything after first /)
	if idx := strings.Index(host, "/"); idx != -1 {
		host = host[:idx]
	}

	// Validate that we have a non-empty hostname
	if host == "" {
		awfHelpersLog.Printf("Invalid %s URL (no hostname): %s", envVar, baseURL)
		return ""
	}

	awfHelpersLog.Printf("Extracted API target host from %s: %s", envVar, host)
	return host
}

// extractAPIBasePath extracts the path component from a custom API base URL in engine.env.
// Returns the path prefix (e.g., "/serving-endpoints") or empty string if no path is present.