dashboard: came back online

dashboard/main.go

@@ -0,0 +1,117 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+	"net/url"
+	"os"
+	"os/signal"
+	"path"
+	"path/filepath"
+	"strings"
+	"syscall"
+
+	"srs.epita.fr/fic-server/dashboard/api"
+	"srs.epita.fr/fic-server/libfic"
+	"srs.epita.fr/fic-server/settings"
+)
+
+var StaticDir string
+var TeamsDir string
+
+type ResponseWriterPrefix struct {
+	real   http.ResponseWriter
+	prefix string
+}
+
+func (r ResponseWriterPrefix) Header() http.Header {
+	return r.real.Header()
+}
+
+func (r ResponseWriterPrefix) WriteHeader(s int) {
+	if v, exists := r.real.Header()["Location"]; exists {
+		r.real.Header().Set("Location", r.prefix+v[0])
+	}
+	r.real.WriteHeader(s)
+}
+
+func (r ResponseWriterPrefix) Write(z []byte) (int, error) {
+	return r.real.Write(z)
+}
+
+func StripPrefix(prefix string, h http.Handler) http.Handler {
+	if prefix == "" {
+		return h
+	}
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if prefix != "/" && r.URL.Path == "/" {
+			http.Redirect(w, r, prefix+"/", http.StatusFound)
+		} else if p := strings.TrimPrefix(r.URL.Path, prefix); len(p) < len(r.URL.Path) {
+			r2 := new(http.Request)
+			*r2 = *r
+			r2.URL = new(url.URL)
+			*r2.URL = *r.URL
+			r2.URL.Path = p
+			h.ServeHTTP(ResponseWriterPrefix{w, prefix}, r2)
+		} else {
+			h.ServeHTTP(w, r)
+		}
+	})
+}
+
+func main() {
+	// Read parameters from command line
+	var bind = flag.String("bind", "127.0.0.1:8082", "Bind port/socket")
+	var baseURL = flag.String("baseurl", "/", "URL prepended to each URL")
+	flag.StringVar(&StaticDir, "static", "./htdocs-dashboard/", "Directory containing static files")
+	flag.StringVar(&TeamsDir, "teams", "./TEAMS", "Base directory where save teams JSON files")
+	flag.StringVar(&settings.SettingsDir, "settings", settings.SettingsDir, "Base directory where load and save settings")
+	flag.Parse()
+
+	log.SetPrefix("[public] ")
+
+	// Sanitize options
+	var err error
+	log.Println("Checking paths...")
+	if StaticDir, err = filepath.Abs(StaticDir); err != nil {
+		log.Fatal(err)
+	}
+	if fic.FilesDir, err = filepath.Abs(fic.FilesDir); err != nil {
+		log.Fatal(err)
+	}
+	if settings.SettingsDir, err = filepath.Abs(settings.SettingsDir); err != nil {
+		log.Fatal(err)
+	}
+	if *baseURL != "/" {
+		tmp := path.Clean(*baseURL)
+		baseURL = &tmp
+	} else {
+		tmp := ""
+		baseURL = &tmp
+	}
+
+	// Prepare graceful shutdown
+	interrupt := make(chan os.Signal, 1)
+	signal.Notify(interrupt, os.Interrupt, syscall.SIGTERM)
+
+	srv := &http.Server{
+		Addr:    *bind,
+		Handler: StripPrefix(*baseURL, api.Router()),
+	}
+
+	// Serve content
+	go func() {
+		log.Fatal(srv.ListenAndServe())
+	}()
+	log.Println(fmt.Sprintf("Ready, listening on %s", *bind))
+
+	// Wait shutdown signal
+	<-interrupt
+
+	log.Print("The service is shutting down...")
+	srv.Shutdown(context.Background())
+	log.Println("done")
+}