forked from sionide21/Go2Lunch
/
server.go
189 lines (160 loc) · 3.44 KB
/
server.go
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package main
import (
"rpc"
"log"
"http"
"net"
"os"
"crypto/hmac"
"crypto/sha512"
"crypto/subtle"
"crypto/rand"
"io/ioutil"
"sync"
"json"
"flag"
"strconv"
)
var port = flag.Uint("p", 1234, "port")
type ServerConfig struct {
Sekritz map[string]string
}
type LunchTracker struct {
*LunchPoll
}
var userMap map[string]*Auth
var config *ServerConfig
var cMutex sync.Mutex
func init() {
userMap = make(map[string]*Auth)
err := loadUsersFromFile()
if err != nil {
panic(err)
}
}
func loadUsersFromFile() (err os.Error) {
tempConfig := &ServerConfig{}
read, err := ioutil.ReadFile("config.json")
if err != nil {
return err
}
err = json.Unmarshal(read, tempConfig)
if err != nil {
return err
}
cMutex.Lock()
config = tempConfig
cMutex.Unlock()
return nil
}
func (t *LunchTracker) AddPlace(args *AddPlaceArgs, place *uint) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*place = t.LunchPoll.addPlace(args.Name, args.Auth.Name)
return nil
}
func (t *LunchTracker) DelPlace(args *UIntArgs, success *bool) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*success = t.LunchPoll.delPlace(args.Num)
return nil
}
func (t *LunchTracker) Drive(args *UIntArgs, success *bool) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*success = t.LunchPoll.drive(args.Auth.Name, args.Num)
return nil
}
func (t *LunchTracker) UnDrive(args *EmptyArgs, success *bool) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*success = t.LunchPoll.unDrive(args.Auth.Name)
return nil
}
func (t *LunchTracker) Vote(args *UIntArgs, success *bool) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*success = t.LunchPoll.vote(args.Auth.Name, args.Num)
return nil
}
func (t *LunchTracker) UnVote(args *EmptyArgs, success *bool) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*success = t.LunchPoll.unVote(args.Auth.Name)
return nil
}
func (t *LunchTracker) DisplayPlaces(args *EmptyArgs, response *[]Place) os.Error {
valid, ive := verify(args.Auth, args)
if !valid {
return ive
}
*response = t.LunchPoll.displayPlaces()
return nil
}
func (t *LunchTracker) Challenge(name *string, challenge *[]byte) os.Error {
_, valid := userMap[(*name)]
if !valid {
valid = checkUser(*name)
if !valid {
return nil
}
}
if challenge == nil {
*challenge = make([]byte, 512)
}
if cap(*challenge) < 512 {
return os.NewError("Challenge too small.")
}
_, err := rand.Read(*challenge)
if err != nil {
panic("Random not random")
}
userMap[*name].SChallenge = *challenge
return nil
}
func checkUser(name string) bool {
loadUsersFromFile()
cMutex.Lock()
_, valid := config.Sekritz[name]
cMutex.Unlock()
if valid {
userMap[name] = &Auth{Name: name, SChallenge: make([]byte, 512)}
}
return valid
}
func verify(a Auth, d Byter) (bool, os.Error) {
cMutex.Lock()
mac := hmac.New(sha512.New, []byte(config.Sekritz[a.Name]))
cMutex.Unlock()
mac.Write([]byte(a.Name))
mac.Write(a.CChallenge)
mac.Write(d.Byte())
mac.Write(a.SChallenge)
if subtle.ConstantTimeCompare(mac.Sum(), a.Mac) == 1 {
return true, os.NewError("Authentication Failed")
}
return false, nil
}
func main() {
flag.Parse()
t := &LunchTracker{NewPoll()}
rpc.Register(t)
rpc.HandleHTTP()
l, e := net.Listen("tcp", ":"+strconv.Uitoa(*port))
if e != nil {
log.Exit("listen error:", e)
}
http.Serve(l, nil)
}