initial

1 files changed, 112 insertions, 0 deletions

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..d8e7015
--- /dev/null
+++ b/main.go
@@ -0,0 +1,112 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"html/template"
+	"log"
+	"net/http"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"strings"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+)
+
+var (
+	templates = template.Must(template.ParseGlob("./tpl/*.gohtml"))
+	packages  = Packages{}
+)
+
+func main() {
+	addr := os.Getenv("ADDR")
+	if addr == "" {
+		addr = ":8080"
+	}
+	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, os.Kill)
+	defer cancel()
+
+	cfg := &Config{}
+
+	fp, err := os.Open("./config.json")
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := json.NewDecoder(fp).Decode(cfg); err != nil {
+		log.Fatal(err)
+	}
+
+	r := chi.NewRouter()
+
+	r.Use(middleware.RequestID)
+	r.Use(middleware.StripSlashes)
+	r.Use(middleware.RealIP)
+	r.Use(middleware.Logger)
+	r.Use(middleware.Recoverer)
+
+	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		templates.ExecuteTemplate(w, "index.gohtml", indexRenderContext{
+			Title:    cfg.Title,
+			Packages: cfg.Packages,
+			Host:     cfg.Host,
+			Doc:      "//pkg.go.dev/",
+		})
+	})
+
+	r.Get("/{pkg}", func(w http.ResponseWriter, r *http.Request) {
+		pkgID := chi.URLParam(r, "pkg")
+		pkg, ok := (*cfg.Packages)[pkgID]
+		if !ok {
+			w.WriteHeader(http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusOK)
+		templates.ExecuteTemplate(w, "package.gohtml", pageRenderContext{
+			Title:   cfg.Title,
+			Package: &pkg,
+			Host:    cfg.Host,
+			Doc:     "//pkg.go.dev/",
+		})
+	})
+
+	workDir, _ := os.Getwd()
+	filesDir := http.Dir(filepath.Join(workDir, "static"))
+	FileServer(r, "/static", filesDir)
+
+	srv := &http.Server{
+		Handler: r,
+		Addr:    addr,
+	}
+	go func() {
+		<-ctx.Done()
+		srv.Shutdown(context.Background())
+	}()
+	log.Println("Start at", addr)
+	if err := srv.ListenAndServe(); err != http.ErrServerClosed {
+		log.Fatal(err)
+	}
+}
+
+// FileServer conveniently sets up a http.FileServer handler to serve
+// static files from a http.FileSystem.
+func FileServer(r chi.Router, path string, root http.FileSystem) {
+	if strings.ContainsAny(path, "{}*") {
+		panic("FileServer does not permit any URL parameters.")
+	}
+
+	if path != "/" && path[len(path)-1] != '/' {
+		r.Get(path, http.RedirectHandler(path+"/", 301).ServeHTTP)
+		path += "/"
+	}
+	path += "*"
+
+	r.Get(path, func(w http.ResponseWriter, r *http.Request) {
+		rctx := chi.RouteContext(r.Context())
+		pathPrefix := strings.TrimSuffix(rctx.RoutePattern(), "/*")
+		fs := http.StripPrefix(pathPrefix, http.FileServer(root))
+		fs.ServeHTTP(w, r)
+	})
+}