func getRouter()

in main.go [358:403]
44 lines of code
6 McCabe index (conditional complexity)

func getRouter(logger *zap.Logger, config *Config, indexer Indexer) (*mux.Router, error) {
	if featureProxyMode {
		logger.Info("Technical preview: Proxy mode is an experimental feature and it may be unstable.")
	}
	proxyMode, err := proxymode.NewProxyMode(logger, proxymode.ProxyOptions{
		Enabled: featureProxyMode,
		ProxyTo: proxyTo,
	})
	if err != nil {
		return nil, fmt.Errorf("can't create proxy mode: %w", err)
	}
	artifactsHandler := artifactsHandlerWithProxyMode(logger, indexer, proxyMode, config.CacheTimeCatchAll)
	signaturesHandler := signaturesHandlerWithProxyMode(logger, indexer, proxyMode, config.CacheTimeCatchAll)
	faviconHandleFunc, err := faviconHandler(config.CacheTimeCatchAll)
	if err != nil {
		return nil, err
	}
	indexHandlerFunc, err := indexHandler(config.CacheTimeIndex)
	if err != nil {
		return nil, err
	}

	categoriesHandler := categoriesHandlerWithProxyMode(logger, indexer, proxyMode, config.CacheTimeCategories)
	packageIndexHandler := packageIndexHandlerWithProxyMode(logger, indexer, proxyMode, config.CacheTimeCatchAll)
	searchHandler := searchHandlerWithProxyMode(logger, indexer, proxyMode, config.CacheTimeSearch)
	staticHandler := staticHandlerWithProxyMode(logger, indexer, proxyMode, config.CacheTimeCatchAll)

	router := mux.NewRouter().StrictSlash(true)
	router.HandleFunc("/", indexHandlerFunc)
	router.HandleFunc("/index.json", indexHandlerFunc)
	router.HandleFunc("/search", searchHandler)
	router.HandleFunc("/categories", categoriesHandler)
	router.HandleFunc("/health", healthHandler)
	router.HandleFunc("/favicon.ico", faviconHandleFunc)
	router.HandleFunc(artifactsRouterPath, artifactsHandler)
	router.HandleFunc(signaturesRouterPath, signaturesHandler)
	router.HandleFunc(packageIndexRouterPath, packageIndexHandler)
	router.HandleFunc(staticRouterPath, staticHandler)
	router.Use(util.LoggingMiddleware(logger))
	router.Use(util.CORSMiddleware())
	if metricsAddress != "" {
		router.Use(metrics.MetricsMiddleware())
	}
	router.NotFoundHandler = notFoundHandler(fmt.Errorf("404 page not found"))
	return router, nil
}