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main.go
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main.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"log"
"net/http"
"strconv"
"strings"
"time"
"github.com/gorilla/mux"
"github.com/spf13/viper"
"github.com/NaySoftware/go-fcm"
"github.com/boltdb/bolt"
"golang.org/x/crypto/bcrypt"
)
var db *bolt.DB
// ChirpAdditionalData provides additional information for the chirp
type ChirpAdditionalData struct {
SrcIp string
Useragent string
Referer string
Location string
}
// Chirp notification struct representing
//the data from the canary token callback
type Chirp struct {
Manage_url string
Memo string
Channel string
Time string
Additional_data ChirpAdditionalData
}
func authedRequestHandler(w http.ResponseWriter, r *http.Request) {
//u, p, ok := r.BasicAuth()
//if !ok {
// w.Header().Set("WWW-Authenticate", `Basic realm="MY REALM"`)
// w.WriteHeader(401)
// w.Write([]byte("401 Unauthorized\n"))
// }
}
// User is used to record the device token for future push notifications
// Pass this to the register function with no token to create a new user.
type User struct {
Username string
Password string
Token string
}
func registerHandler(w http.ResponseWriter, r *http.Request) {
dec := json.NewDecoder(r.Body)
var u User
err := dec.Decode(&u)
if err != nil {
log.Println(err)
}
if validUser(db, u) {
if validUserCredentials(db, u) {
err := updateUserToken(db, u)
if err != nil {
log.Println(err)
http.Error(w, err.Error(), 400)
} else {
log.Println(fmt.Sprintf("%s Updated", u.Username))
}
} else {
log.Println(fmt.Sprintf("Invalid creds"))
http.Error(w, "Invalid creds", 401)
}
} else {
log.Println(fmt.Sprintf("New user found"))
if viper.GetBool("AllowMultiUserRegistration") {
log.Println(fmt.Sprintf("New user being registered"))
setupUser(db, u)
err = updateUserToken(db, u)
if err != nil {
log.Println(err)
http.Error(w, err.Error(), 400)
}
}
}
log.Println("OK")
fmt.Fprintf(w, "OK")
}
func sendNotification(notificationID, message string) {
ids := []string{
notificationID,
}
data := map[string]string{
"msg": message,
"sum": message,
"click_action": "fcm.ACTION.PING",
}
c := fcm.NewFcmClient(viper.GetString("ServerAuthToken"))
c.NewFcmRegIdsMsg(ids, data)
status, err := c.Send()
if err == nil {
status.PrintResults()
} else {
fmt.Println(err)
}
}
func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "OK")
dec := json.NewDecoder(r.Body)
var c Chirp
err := dec.Decode(&c)
if err != nil {
log.Println(err)
return
}
err = recordChirp(db, c)
if err != nil {
log.Println(err)
} else {
vars := mux.Vars(r)
var defaultChirper = viper.GetString("AdminUser")
token := ""
if chirper, ok := vars["chirper"]; ok {
defaultChirper = chirper
token = getUserToken(db, defaultChirper)
if token == "" {
if defaultChirper != chirper {
defaultChirper = viper.GetString("AdminUser")
}
}
}
token = getUserToken(db, defaultChirper)
var message = fmt.Sprintf("Canary Token Triggered : %s", c.Memo)
sendNotification(token, message)
}
log.Println(c)
}
func updateUserToken(db *bolt.DB, u User) error {
return db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("Tokens"))
if b == nil {
b, _ = tx.CreateBucket([]byte("Tokens"))
}
err := b.Put([]byte(fmt.Sprintf("user-%s", strings.ToLower(u.Username))), []byte(u.Token))
return err
})
}
func recordChirp(db *bolt.DB, c Chirp) error {
return db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("Chirps"))
if b == nil {
b, _ = tx.CreateBucket([]byte("Chirps"))
}
t := strconv.FormatInt(time.Now().Unix(), 10)
var test bytes.Buffer
enc := json.NewEncoder(&test)
enc.Encode(&c)
err := b.Put([]byte(t), []byte(test.String()))
return err
})
}
func validUser(db *bolt.DB, user User) bool {
userExists := false
db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("Auth"))
if b == nil {
return nil
}
v := b.Get([]byte(fmt.Sprintf("user-%s", strings.ToLower(user.Username))))
userExists = (v != nil)
return nil
})
return userExists
}
func getUserToken(db *bolt.DB, username string) string {
userToken := ""
db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("Tokens"))
if b == nil {
return nil
}
v := b.Get([]byte(fmt.Sprintf("user-%s", strings.ToLower(username))))
if v != nil {
userToken = string(v)
return nil
}
return errors.New("Token not found")
})
return userToken
}
func validUserCredentials(db *bolt.DB, user User) bool {
err := db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("Auth"))
if b == nil {
return nil
}
v := b.Get([]byte(fmt.Sprintf("user-%s", strings.ToLower(user.Username))))
if v != nil {
err := bcrypt.CompareHashAndPassword(v, []byte(user.Password))
if err != nil {
return errors.New("Invalid pass")
}
}
return nil
})
return err == nil
}
func setupDB() *bolt.DB {
log.Println("Opening DB")
db, err := bolt.Open("echo.db", 0600, nil)
if err != nil {
log.Fatal(err)
}
return db
}
func setupUser(db *bolt.DB, u User) error {
return db.Update(func(tx *bolt.Tx) error {
var b = tx.Bucket([]byte("Auth"))
if b == nil {
b, _ = tx.CreateBucket([]byte("Auth"))
}
bytePass, err := bcrypt.GenerateFromPassword([]byte(u.Password), 14)
if err != nil {
return err
}
err = b.Put([]byte(fmt.Sprintf("user-%s", strings.ToLower(u.Username))), bytePass)
return err
})
}
func main() {
//Default settings to use if a config file is not provided.
viper.SetDefault("AllowMultiUserRegistration", false)
viper.SetDefault("WebPort", "8011")
viper.SetDefault("AdminUser", "Admin")
viper.SetDefault("AdminPass", "AdminPass")
viper.SetDefault("ServerAuthToken", "")
viper.SetConfigType("yaml")
viper.SetConfigName("echo-config")
viper.AddConfigPath(".")
viper.ReadInConfig()
db = setupDB()
defer db.Close()
u := User{Username: viper.GetString("AdminUser"),
Password: viper.GetString("AdminPass")}
if !validUser(db, u) {
setupUser(db, u)
}
log.Println("Starting server")
r := mux.NewRouter()
r.HandleFunc("/", handler)
r.HandleFunc("/register-token/", registerHandler)
r.HandleFunc("/personal/{chirper}/", handler)
http.Handle("/", r)
err := http.ListenAndServe(fmt.Sprintf(":%s", viper.Get("WebPort")), nil)
if err != nil {
fmt.Println(err.Error())
}
}