inventory-plus-plus/internal/server/server.go

package server

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"html/template"
	"log/slog"
	"net/http"
	"path"
	"strconv"

	"github.com/angelbeltran/templater"

	"ruben/inventory2/internal/domains/accounts"
	"ruben/inventory2/internal/domains/authentication"
	etsy_platform "ruben/inventory2/internal/domains/platforms/etsy"
	"ruben/inventory2/internal/domains/raw_events"
	accounts_api "ruben/inventory2/internal/server/api/accounts"
	auth_api "ruben/inventory2/internal/server/api/auth"
	templates_api "ruben/inventory2/internal/server/api/templates"
	"ruben/inventory2/internal/server/middleware"
	"ruben/inventory2/internal/server/response"
	"ruben/inventory2/internal/server/router"
	"ruben/inventory2/internal/server/webhooks"
	etsy_webhooks "ruben/inventory2/internal/server/webhooks/etsy"
)

func NewServer(
	ctx context.Context,
	logger *slog.Logger,
	contentDir string,
	rawEvents *raw_events.Store,
	accts *accounts.Store,
	etsy *etsy_platform.Platform,
	auth *authentication.Authenticator,
) http.Handler {
	mux := router.NewMux(
		logger,
		middleware.LogRequests(ctx, logger.WithGroup("request")),
	)

	// TODO: shouldn't this ACTUALLY be a middleware?
	//		- only try to make this an actual middleware AFTER all the routers are broken out, so that way how the middleware is supposed to work can be known
	authMiddleware := middleware.NewAuth(
		logger.WithGroup("auth-middleware"),
		auth,
		auth_api.NewLoginURL,
		accts,
	)

	// webpage content

	// non-html content: scripts, styles, images, etc

	scfs := http.FileServer(http.Dir(contentDir + "/scripts"))
	mux.Mux.Handle("GET /scripts/", http.StripPrefix("/scripts", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/javascript")
		if path.Ext(r.URL.Path) == ".gz" {
			w.Header().Set("Content-Encoding", "gzip")
		}
		scfs.ServeHTTP(w, r)
	})))
	mux.Mux.Handle("GET /styles/", http.StripPrefix("/styles", http.FileServer(http.Dir(contentDir+"/styles"))))
	mux.Mux.Handle("GET /favicon/", http.StripPrefix("/favicon", http.FileServer(http.Dir(contentDir+"/favicon"))))

	// html (must be before the api endpoints, because the webpage middleware has to be installed beforehand

	// kind of a dumb way to capture routes for webpages
	wpr := templates_api.NewWebpageRouter(
		logger.WithGroup("templates"),
		contentDir,
		templater.NewTemplater(
			contentDir+"/templates",
			func() template.FuncMap {
				return template.FuncMap{
					// params
					"addPathParam": func(k string, v any, args map[string]any) (map[string]any, error) {
						pathParams, ok := args["PathParams"].(map[string]string)
						if !ok {
							return nil, fmt.Errorf("PathParams no set are args: %v", args)
						}

						pathParams[k] = fmt.Sprint(v)

						return args, nil
					},

					// parsing
					"parseInt": func(s string) (int, error) {
						return strconv.Atoi(s)
					},
					"parseInt64": func(s string) (int64, error) {
						return strconv.ParseInt(s, 10, 64)
					},
					"parsePlatform": func(s string) (accounts.Platform, error) {
						return accounts.NewPlatform(s)
					},

					// arithmetic
					"addInt": func(a, b int) int {
						return a + b
					},
					"subInt": func(a, b int) int {
						return a - b
					},
					"multInt": func(a, b int) int {
						return a * b
					},

					// json
					"prettyPrintJSON": func(j json.RawMessage) string {
						b, err := json.MarshalIndent(j, " ", "")
						if err != nil {
							return string(j)
						}
						return string(b)
					},
				}
			},
		),
		rawEvents,
		accts,
		etsy,
		authMiddleware,
	)
	mux.AddMiddleware(
		func(fn response.HandlerFunc) response.HandlerFunc {
			return func(r *http.Request) (response.Response, error) {
				res, err := fn(r)
				if err == nil || !errors.Is(err, router.ErrHandlerNotFound) {
					return res, err
				}

				renderWebPage, pathParams, found := wpr.Handler(r)
				if !found {
					return nil, response.NotFound()
				}

				for k, v := range pathParams {
					r.SetPathValue(k, v)
				}

				return renderWebPage(r)
			}
		},
	)

	mux.Route("/", wpr)

	// api endpoints

	mux.Route("/auth", auth_api.NewLoginSubrouter(logger.WithGroup("/auth"), auth))
	mux.Route("/accounts", accounts_api.NewAccountSubrouter(
		logger.WithGroup("/accounts"),
		accts,
		authMiddleware,
	))

	// api webhooks (TODO: make a router for these)

	webhookHandler := http.StripPrefix("/webhooks", webhooks.New(
		logger.WithGroup("webhooks"),
		rawEvents,
		etsy,
		webhooks.Config{
			Etsy: etsy_webhooks.Config{
				OAuthRedirectURIWithAcctIDParam: "/oauth/account/{acctID}/auth_code",
			},
		},
	))
	mux.Mux.Handle("GET /webhooks/", webhookHandler)
	mux.Mux.Handle("POST /webhooks/", webhookHandler)
	mux.Mux.Handle("PUT /webhooks/", webhookHandler)

	return mux
}