/
token.go
198 lines (170 loc) · 5.34 KB
/
token.go
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package main
import (
"database/sql"
"fmt"
"github.com/gorilla/mux"
"github.com/go-sql-driver/mysql"
"golang.org/x/crypto/bcrypt"
"log"
"net/http"
"strings"
"time"
"crypto/rand"
"github.com/jmoiron/sqlx"
)
type UserToken struct {
Token string
UserId int64
LoginTime mysql.NullTime
LastSeenTime mysql.NullTime
}
func PostTokenHandler(rw http.ResponseWriter, r *http.Request) {
r.ParseForm()
handleOrEmail := r.PostFormValue("handleOrEmail")
if len(handleOrEmail) == 0 {
fmt.Println("Missing handle or email.")
sendError(rw, http.StatusBadRequest, "Missing handle or email.")
return
}
password := r.PostFormValue("password")
if len(password) == 0 {
fmt.Println("Missing password.")
sendError(rw, http.StatusBadRequest, "Missing password.")
return
}
ip := getIP(r)
// fmt.Println("client ip is", ip)
// rate limit by ip
ipLimit, err := FetchIPLimit(db, ip)
if err != nil {
fmt.Println(err)
sendError(rw, http.StatusInternalServerError, err.Error())
return
}
if ipLimit.LastLoginAttemptDate.Valid && time.Now().Before(ipLimit.LastLoginAttemptDate.Time.Add(time.Duration(SecondsBetweenLoginAttemptsPerIP) * time.Second)) {
fmt.Println("Too many login attempts from this address.", ipLimit)
sendError(rw, 429, "Too many login attempts from this address.")
return
}
// rate limit by handle even if it's not a real handle, because otherwise we would reveal its existence
limit, err := FetchHandleLimit(db, handleOrEmail)
if err != nil {
fmt.Println(err)
sendError(rw, http.StatusInternalServerError, err.Error())
return
}
if limit.LoginAttemptCount > 0 && time.Now().Before(limit.LastAttemptDate.Time.Add(time.Duration(limit.NextLoginDelay) * time.Second)) {
fmt.Println("Too many login attempts.", limit)
sendError(rw, 429, "Too many login attempts.")
return
}
var u User
err = db.Get(&u, "SELECT `UserId`, `Handle`, `Status`, `Biography`, `PasswordHash`, `JoinedDate` FROM `User` " +
"WHERE Handle LIKE ? OR Email LIKE ? LIMIT 1", handleOrEmail, handleOrEmail)
if err == sql.ErrNoRows {
// in order to prevent not found user failing more quickly than bad password
// proceed with checking password against dummy hash
// dummy, _ := bcrypt.GenerateFromPassword([]byte(RandomString(50)), bcrypt.DefaultCost)
// fmt.Println("dummy hash: ", string(dummy))
u.PasswordHash = "$2a$10$tg.SM/VMqShumLh/uhB1BOCFcQyCIBu4XvBf7lszBw2lMew1ubNWq"
u.UserId = -1
} else if err != nil {
fmt.Println(err)
sendError(rw, http.StatusInternalServerError, err.Error())
return
}
err = bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(password))
if err != nil || u.UserId <= 0 {
err = limit.Bump(db)
if err != nil {
fmt.Println(err)
}
err = ipLimit.LogAttempt(db)
if err != nil {
fmt.Println(err)
}
fmt.Println("Bad credentials.")
sendError(rw, http.StatusUnauthorized, "No user was found that matched the handle or email and password given.")
return
}
limit.Clear(db)
t, err := MakeToken(db, &u)
if err != nil {
sendError(rw, http.StatusInternalServerError, err.Error())
return
}
resp := map[string]interface{}{
"user": &u,
"token": t.Token,
}
sendData(rw, http.StatusCreated, resp)
}
func DeleteTokenHandler(rw http.ResponseWriter, r *http.Request) {
err := DeleteToken(db, mux.Vars(r)["token"])
if err != nil {
fmt.Println(err)
sendError(rw, http.StatusInternalServerError, err.Error())
return
}
// TODO: is it silly to send "No Content" along with an evelope?
sendData(rw, http.StatusNoContent, "")
}
func FetchToken(db *sqlx.DB, r *http.Request) (*UserToken, error) {
auth := r.Header.Get("Authorization")
userPrefix := "IMP user="
guestPrefix := "IMP guest="
if strings.HasPrefix(auth, userPrefix) {
token := auth[len(userPrefix):]
t := new(UserToken)
err := db.Get(t, "SELECT `Token`, `UserId`, `LoginTime`, `LastSeenTime` FROM `UserToken` WHERE Token LIKE ? LIMIT 1", token)
if err == sql.ErrNoRows {
return nil, nil
} else if err != nil {
log.Println(err)
return nil, err
}
return t, nil
}
if strings.HasPrefix(auth, guestPrefix) {
// token := auth[len(guestPrefix):]
// TODO: guest auth
// t := new(UserToken)
// err := db.Get(t, "SELECT `Token`, `UserId`, `LoginTime`, `LastSeenTime` FROM `UserToken` WHERE Token LIKE ? LIMIT 1", token)
// if err == sql.ErrNoRows {
// return nil, nil
// } else if err != nil {
// log.Println(err)
// return nil, err
// }
// return t, nil
}
return nil, nil
}
func MakeToken(db *sqlx.DB, user *User) (*UserToken, error) {
t := new(UserToken)
t.Token = RandomString(50)
t.UserId = user.UserId
t.LoginTime.Time = time.Now()
t.LoginTime.Valid = true
t.LastSeenTime.Time = time.Now()
t.LastSeenTime.Valid = true
_, err := db.NamedExec("INSERT INTO `UserToken` (`Token`, `UserId`, `LoginTime`, `LastSeenTime`) " +
"VALUES (:Token, :UserId, :LoginTime, :LastSeenTime)", t)
if err != nil {
return nil, err
}
return t, nil
}
func DeleteToken(db *sqlx.DB, token string) (err error) {
_, err = db.Exec("DELETE FROM `UserToken` WHERE Token LIKE ?", token)
return
}
func RandomString(strSize int) string {
dictionary := "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
var bytes = make([]byte, strSize)
rand.Read(bytes)
for k, v := range bytes {
bytes[k] = dictionary[v % byte(len(dictionary))]
}
return string(bytes)
}