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package main
import (
"flag"
"fmt"
"io/ioutil"
"log"
"net/http"
"strings"
"github.com/gorilla/mux"
)
var (
port *int // port the http server listens on
usernames []string // list of usernames
// map usernames to their companion containers
// the companion containers get assigned a random string used to identify itself
companion map[string]string
)
func registerHTTPFlags() {
port = flag.Int("port", 8081, "The port the http server should listen on")
}
func setupHTTPServer() http.Server {
r := mux.NewRouter()
r.HandleFunc("/", indexHandler)
r.HandleFunc("/register", registerGetHandler).Methods("GET")
r.HandleFunc("/register", registerPostHandler).Methods("POST")
return http.Server{
Addr: fmt.Sprintf("0.0.0.0:%d", *port),
Handler: r,
}
}
// Host of the index file
func indexHandler(w http.ResponseWriter, r *http.Request) {
readFileToReponse(w, "/index.html")
}
// Read register page
func registerGetHandler(w http.ResponseWriter, r *http.Request) {
readFileToReponse(w, "/register.html")
}
// Process a registration
func registerPostHandler(w http.ResponseWriter, r *http.Request) {
r.ParseForm()
username := r.Form.Get("username")
// test if the username has already been chosen
if !isUniq(username) {
log.Println("redirecting to usernameTaken")
usernameTakenGetHandler(w, r)
return
}
// add the new username to the list of usernames
usernames = append(usernames, username)
// generate a new accesscode
accesscode := newAccessCode()
log.Printf("Generated a new AccessCode for user %s: %s", username, accesscode)
// generate a new companion
spawnCompanion(username, accesscode)
// redirect the user to the front page
http.Redirect(w, r, "/", http.StatusTemporaryRedirect)
}
func usernameTakenGetHandler(w http.ResponseWriter, r *http.Request) {
log.Println("[usernameTaken]")
readFileToReponse(w, "/usernameTaken.html")
}
func isUniq(username string) bool {
for _, user := range usernames {
if username == user {
return false
}
}
return true
}
func readFileToReponse(w http.ResponseWriter, path string) {
requestedFile := strings.Replace(path, "..", "", -1)
contents, readError := ioutil.ReadFile(fmt.Sprintf("hosted/%s", requestedFile))
if readError != nil {
w.Write([]byte(fmt.Sprintf("unable to read %s", requestedFile)))
} else {
w.Write([]byte(contents))
}
}
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