From 1ed8283df70c5c2f597821fd318cbda89d2eb7ea Mon Sep 17 00:00:00 2001
From: Thibaut Horel <thibaut.horel@gmail.com>
Date: Sat, 29 Dec 2018 19:33:16 -0500
Subject: Add basic user page

---
 main.go | 64 ++++++++++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 42 insertions(+), 22 deletions(-)

(limited to 'main.go')

diff --git a/main.go b/main.go
index e7718a3..a5de4dc 100644
--- a/main.go
+++ b/main.go
@@ -1,9 +1,7 @@
 package main
 
 import (
-	"crypto/md5"
 	"crypto/subtle"
-	"encoding/hex"
 	"flag"
 	"fmt"
 	"html/template"
@@ -29,35 +27,50 @@ func logMux(handler http.Handler) http.Handler {
 	})
 }
 
-func (app *App) validateHandler(w http.ResponseWriter, r *http.Request) {
+func (app *App) validate(r *http.Request) (*Session, bool) {
 	c, err := r.Cookie("id")
-	//log.Println(r.Header.Get("X-Original-URI"))
-	//log.Println(r.Host)
 	if err != nil {
+		return nil, false
+	} else if s, ok := app.GetSession(c.Value); ok {
+		return s, true
+	} else {
+		return nil, false
+	}
+}
+
+func (app *App) validateHandler(w http.ResponseWriter, r *http.Request) {
+	if s, ok := app.validate(r); ok {
+		w.Header().Set("X-Remote-User", strconv.FormatInt(s.UserId, 10))
+		w.WriteHeader(http.StatusOK)
+	} else {
 		w.WriteHeader(http.StatusUnauthorized)
+	}
+}
+
+func (app *App) rootHandler(w http.ResponseWriter, r *http.Request) {
+	if s, ok := app.validate(r); ok {
+		app.Template.ExecuteTemplate(w, "index.tmpl", s)
 	} else {
-		if s, ok := app.GetSession(c.Value); ok {
-			w.Header().Set("X-Remote-User", strconv.FormatInt(s.UserId, 10))
-			w.WriteHeader(http.StatusOK)
-		} else {
-			log.Println("Session does not exist:", c.Value)
-			w.WriteHeader(http.StatusUnauthorized)
-		}
+		http.Redirect(w, r, "/login", http.StatusSeeOther)
 	}
 }
 
 func (app *App) loginHandler(w http.ResponseWriter, r *http.Request) {
-	if r.Method == http.MethodPost {
+	if _, ok := app.validate(r); ok {
+		http.Redirect(w, r, "/", http.StatusSeeOther)
+		return
+	} else if r.Method == http.MethodPost {
 		username := r.FormValue("username")
-		password := r.FormValue("password")
+		hash := md5hex([]byte(r.FormValue("password")))
 		next := r.FormValue("next")
-		hash := md5.Sum([]byte(password))
-		dst := make([]byte, hex.EncodedLen(md5.Size))
-		hex.Encode(dst, hash[:])
 		u, ok := app.GetUser(username)
-		if ok && subtle.ConstantTimeCompare(u.Password, dst) == 1 {
+		if ok && subtle.ConstantTimeCompare(u.Password, hash) == 1 {
 			s := app.NewSession(u.Id)
-			c := http.Cookie{Name: "id", Value: s.Id, Domain: "." + app.Domain}
+			c := http.Cookie{
+				Name:   "id",
+				Value:  s.Id,
+				Domain: "." + app.Domain,
+			}
 			http.SetCookie(w, &c)
 			http.Redirect(w, r, next, http.StatusSeeOther)
 		} else {
@@ -74,13 +87,17 @@ func (app *App) loginHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func (app *App) logoutHandler(w http.ResponseWriter, r *http.Request) {
-	c := http.Cookie{Name: "id", Value: "", Domain: "." + app.Domain, MaxAge: 0}
+	c := http.Cookie{
+		Name:   "id",
+		Value:  "",
+		Domain: "." + app.Domain,
+		MaxAge: 0,
+	}
 	http.SetCookie(w, &c)
 	http.Redirect(w, r, "/login", http.StatusSeeOther)
 }
 
 func main() {
-
 	flag.Usage = func() {
 		fmt.Fprintf(
 			flag.CommandLine.Output(),
@@ -99,11 +116,14 @@ func main() {
 	}
 
 	store := NewPgStore(flag.Args()[0])
-	template := template.Must(template.New("").ParseGlob(filepath.Join(*templateDir, "*.tmpl")))
+	template := template.Must(
+		template.New("").ParseGlob(filepath.Join(*templateDir, "*.tmpl")),
+	)
 	app := &App{store, template, flag.Args()[1]}
 	http.HandleFunc("/validate", app.validateHandler)
 	http.HandleFunc("/login", app.loginHandler)
 	http.HandleFunc("/logout", app.logoutHandler)
+	http.HandleFunc("/", app.rootHandler)
 	if err := http.ListenAndServe(*address, logMux(http.DefaultServeMux)); err != nil {
 		panic(err)
 	}
-- 
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