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package main
import (
"crypto/subtle"
"flag"
"fmt"
"html/template"
"log"
"net/http"
"os"
"path/filepath"
"strconv"
"time"
)
type App struct {
Store
Template *template.Template
Domain string
Header string
}
func logMux(handler http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
t := time.Now()
handler.ServeHTTP(w, r)
log.Println(r.Method, r.URL.Path, time.Since(t))
})
}
func (app *App) validate(r *http.Request) (*Session, bool) {
c, err := r.Cookie("id")
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(app.Header, 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 {
http.Redirect(w, r, "/login", http.StatusSeeOther)
}
}
func (app *App) loginHandler(w http.ResponseWriter, r *http.Request) {
if _, ok := app.validate(r); ok {
http.Redirect(w, r, "/", http.StatusSeeOther)
return
} else if r.Method == http.MethodPost {
username := r.FormValue("username")
hash := md5hex([]byte(r.FormValue("password")))
next := r.FormValue("next")
u, ok := app.GetUser(username)
if ok && subtle.ConstantTimeCompare(u.Password, hash) == 1 {
s := app.NewSession(u.Id)
c := http.Cookie{
Name: "id",
Value: s.Id,
Domain: "." + app.Domain,
}
http.SetCookie(w, &c)
http.Redirect(w, r, next, http.StatusSeeOther)
} else {
app.Template.ExecuteTemplate(w, "login.tmpl", struct {
Next string
}{next})
}
} else if r.Method == http.MethodGet {
next := r.FormValue("next")
app.Template.ExecuteTemplate(w, "login.tmpl", struct {
Next string
}{next})
}
}
func (app *App) logoutHandler(w http.ResponseWriter, r *http.Request) {
if s, ok := app.validate(r); ok {
// should we save old sessions in another table?
app.DeleteSession(s.Id)
c := http.Cookie{
Name: "id",
Value: "",
Domain: "." + app.Domain,
MaxAge: -1,
}
http.SetCookie(w, &c)
}
http.Redirect(w, r, "/login", http.StatusSeeOther)
}
func main() {
flag.Usage = func() {
fmt.Fprintf(
flag.CommandLine.Output(),
"Usage: %s [OPTIONS] [DATABASE] [DOMAIN]\n",
os.Args[0],
)
flag.PrintDefaults()
}
address := flag.String("a", ":8080", "bind the server to `address`")
templateDir := flag.String("t", "templates", "template `directory`")
header := flag.String(
"header",
"X-Remote-User",
"http `header` containing the user id",
)
flag.Parse()
if flag.NArg() < 2 {
fmt.Print("Argument missing. ")
flag.Usage()
os.Exit(1)
}
store := NewPgStore(flag.Args()[0])
template := template.Must(
template.New("").ParseGlob(filepath.Join(*templateDir, "*.tmpl")),
)
app := &App{store, template, flag.Args()[1], *header}
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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