95 lines
2.0 KiB
Go
95 lines
2.0 KiB
Go
package main
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import (
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"context"
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"errors"
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"log"
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"mime"
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"net"
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"net/http"
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"os"
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"os/signal"
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"path"
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"path/filepath"
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"time"
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)
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var baseDirectory string
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func handler(w http.ResponseWriter, r *http.Request) {
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filePath := path.Join(baseDirectory, r.URL.Path)
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file, err := os.Stat(filePath)
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if err == nil && !file.IsDir() {
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// file exists
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gz := filePath + ".gz"
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file, err := os.Stat(gz)
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t := mime.TypeByExtension(filepath.Ext(filePath))
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if err == nil && !file.IsDir() && t != "" {
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w.Header().Add("Content-Encoding", "gzip")
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w.Header().Add("Content-Type", t)
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http.ServeFile(w, r, gz)
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} else {
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http.ServeFile(w, r, filePath)
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}
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} else {
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// file does not exist
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index := path.Join(baseDirectory, "index.html")
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file, err := os.Stat(index)
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if err == nil && !file.IsDir() {
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// index.html exists
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http.ServeFile(w, r, index)
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} else {
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// index.html does not exist
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http.NotFound(w, r)
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}
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}
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}
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func main() {
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listeningPort, ok := os.LookupEnv("PORT")
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if !ok {
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listeningPort = "5050"
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}
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listeningHost, ok := os.LookupEnv("HOST")
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if !ok {
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listeningHost = "127.0.0.1"
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}
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baseDirectory, ok = os.LookupEnv("BASE_DIRECTORY")
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if !ok {
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baseDirectory = "."
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}
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router := http.NewServeMux()
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router.HandleFunc("/", handler)
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server := &http.Server{
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Addr: net.JoinHostPort(listeningHost, listeningPort),
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Handler: router,
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}
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exitSignal := make(chan os.Signal, 1)
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signal.Notify(exitSignal, os.Interrupt)
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go func() {
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<-exitSignal
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log.Println("Received shutdown signal, shutting down")
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ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
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defer cancel()
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err := server.Shutdown(ctx)
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if err != nil {
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log.Printf("Error occured during shutting down HTTP server: %s", err.Error())
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}
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}()
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log.Printf("HTTP server listening on %s", server.Addr)
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err := server.ListenAndServe()
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if err != nil && !errors.Is(err, http.ErrServerClosed) {
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log.Fatalf("Error occured during listening to HTTP server: %s", err.Error())
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}
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}
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