forked from sionide21/Go2Lunch
/
lunch.go
264 lines (238 loc) · 5.15 KB
/
lunch.go
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package main
import (
"flag"
"strconv"
"rpc"
"fmt"
"strings"
"os"
"crypto/hmac"
"crypto/sha512"
"crypto/rand"
"io/ioutil"
"json"
"encoding/base64"
"path"
)
const (
destErr = "Invalid Destination"
configFile = ".lunch_config.json"
)
var add = flag.Bool("a", false, "add a place")
var del = flag.Bool("rm", false, "remove a place")
var seats = flag.Uint("d", 0, "driver with _ additional seats")
var unvote = flag.Bool("u", false, "unvote")
var server = flag.String("s", "", "[host]:[port]")
var name = flag.String("n", "", "user name")
var walk = flag.Bool("w", false, "not driving")
var sekrit = ""
var user = ""
var host = ""
type LunchServer struct {
*rpc.Client
Auth
}
func getConfig() (err os.Error) {
config := make(map[string]string)
home := os.Getenv("HOME")
read, err := ioutil.ReadFile(path.Join(home, configFile))
if err != nil {
return
}
err = json.Unmarshal(read, &config)
if err != nil {
return
}
var ok bool
sekrit, ok = config["sekrit"]
if !ok {
return os.NewError("No Sekrit")
}
host, ok = config["host"]
if !ok {
return os.NewError("No Host")
}
user, ok = config["user"]
if !ok {
return os.NewError("No User")
}
return
}
func genConfig() (err os.Error) {
getConfig()
config := make(map[string]string)
if *server != "" {
config["host"] = *server
} else {
config["host"] = host
}
if *name != "" {
config["user"] = *name
} else {
config["user"] = user
}
if sekrit == "" {
newSekrit := make([]byte, 512, 512)
encoder := base64.StdEncoding
_, err := rand.Read(newSekrit)
if err != nil {
panic("Random not random")
}
newEncoded := make([]byte, encoder.EncodedLen(len(newSekrit)), encoder.EncodedLen(len(newSekrit)))
encoder.Encode(newEncoded, newSekrit)
config["sekrit"] = string(newEncoded)
}
if config["sekrit"] == "" {
err = os.NewError("Missing Sekrit")
return
} else {
sekrit = config["sekrit"]
}
if config["user"] == "" {
err = os.NewError("Missing User")
return
} else {
user = config["user"]
}
if config["host"] == "" {
err = os.NewError("Missing host")
} else {
host = config["host"]
}
data, err := json.Marshal(config)
if err != nil {
return
}
home := os.Getenv("HOME")
err = ioutil.WriteFile(path.Join(home, configFile), data, 0600)
return
}
func main() {
flag.Parse()
err := getConfig()
if err != nil {
err = genConfig()
if err != nil {
panic(err)
}
fmt.Println("\"" + user + "\":\"" + sekrit + "\"")
return
}
r, e := rpc.DialHTTP("tcp", host)
if e != nil {
fmt.Println("Cannot connect to server: " + host)
os.Exit(-1)
}
remote := &LunchServer{r, Auth{Name: "User"}}
if *seats != 0 {
if !remote.drive(*seats) {
fmt.Println("Drive Failed")
}
return
}
if *walk {
if !remote.undrive() {
fmt.Println("UnDrive Failed")
}
return
}
if !*unvote && flag.NArg() == 0 {
places := remote.displayPlaces()
if places != nil {
for _, p := range *places {
fmt.Println(p.String())
}
}
return
}
var dest uint = 0
if *add && !*del {
name := strings.Join(flag.Args(), " ")
dest = remote.addPlace(name)
return
}
if dest == 0 {
dest, _ = strconv.Atoui(flag.Arg(0))
}
if *del {
if !remote.delPlace(dest) {
fmt.Println("Could not delete. This can happen if there are still votes on the place or if you did not nominate it.")
}
return
}
if *unvote {
if !remote.unvote() {
fmt.Println("Unvoting Failed")
}
return
} else {
if !remote.vote(dest) {
fmt.Println("Vote Failed")
}
return
}
}
func (t *LunchServer) addPlace(name string) (place uint) {
args := &AddPlaceArgs{Name: name}
args.Auth = *(t.calcAuth(args))
t.Call("LunchTracker.AddPlace", &args, &place)
return
}
func (t *LunchServer) delPlace(dest uint) (suc bool) {
args := &UIntArgs{Num: dest}
args.Auth = *(t.calcAuth(args))
t.Call("LunchTracker.DelPlace", args, &suc)
return
}
func (t *LunchServer) drive(seats uint) (suc bool) {
args := &UIntArgs{Num: seats}
args.Auth = *(t.calcAuth(args))
t.Call("LunchTracker.Drive", args, &suc)
return
}
func (t *LunchServer) vote(dest uint) (suc bool) {
args := &UIntArgs{Num: dest}
args.Auth = *(t.calcAuth(args))
t.Call("LunchTracker.Vote", args, &suc)
return
}
func (t *LunchServer) unvote() (suc bool) {
args := &EmptyArgs{}
args.Auth = *(t.calcAuth(args))
t.Call("LunchTracker.UnVote", args, &suc)
return
}
func (t *LunchServer) displayPlaces() *[]Place {
args := &EmptyArgs{}
args.Auth = *(t.calcAuth(args))
var places []Place
t.Call("LunchTracker.DisplayPlaces", args, &places)
return &places
}
func (t *LunchServer) undrive() (suc bool) {
args := &EmptyArgs{}
args.Auth = *(t.calcAuth(args))
t.Call("LunchTracker.UnDrive", args, &suc)
return
}
func (t *LunchServer) calcAuth(d Byter) (a *Auth) {
var challenge []byte
t.Call("LunchTracker.Challenge", &user, &challenge)
a = &Auth{Name: user, CChallenge: challenge}
sum(d, a)
return
}
func sum(d Byter, a *Auth) {
challenge := make([]byte, 512)
_, err := rand.Read(challenge)
if err != nil {
panic("Random not random.")
}
(*a).CChallenge = challenge
mac := hmac.New(sha512.New, []byte(sekrit))
mac.Write([]byte((*a).Name))
mac.Write((*a).CChallenge)
mac.Write(d.Byte())
mac.Write((*a).SChallenge)
(*a).Mac = mac.Sum()
}