// Package util provides utility functions for the CLI Proxy API server.// It includes helper functions for proxy configuration, HTTP client setup,// log level management, and other common operations used across the application.package util import (	"context"	"net"	"net/http"	"net/url" 	"github.com/luispater/CLIProxyAPI/internal/config"	log "github.com/sirupsen/logrus"	"golang.org/x/net/proxy") // SetProxy configures the provided HTTP client with proxy settings from the configuration.// It supports SOCKS5, HTTP, and HTTPS proxies. The function modifies the client's transport// to route requests through the configured proxy server.func SetProxy(cfg *config.Config, httpClient *http.Client) *http.Client {	var transport *http.Transport	// Attempt to parse the proxy URL from the configuration.	proxyURL, errParse := url.Parse(cfg.ProxyURL)	if errParse == nil {		// Handle different proxy schemes.		if proxyURL.Scheme == "socks5" {			// Configure SOCKS5 proxy with optional authentication.			username := proxyURL.User.Username()			password, _ := proxyURL.User.Password()			proxyAuth := &proxy.Auth{User: username, Password: password}			dialer, errSOCKS5 := proxy.SOCKS5("tcp", proxyURL.Host, proxyAuth, proxy.Direct)			if errSOCKS5 != nil {				log.Errorf("create SOCKS5 dialer failed: %v", errSOCKS5)				return httpClient			}			// Set up a custom transport using the SOCKS5 dialer.			transport = &http.Transport{				DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {					return dialer.Dial(network, addr)				},			}		} else if proxyURL.Scheme == "http" || proxyURL.Scheme == "https" {			// Configure HTTP or HTTPS proxy.			transport = &http.Transport{Proxy: http.ProxyURL(proxyURL)}		}	}	// If a new transport was created, apply it to the HTTP client.	if transport != nil {		httpClient.Transport = transport	}	return httpClient}