/
main.go
131 lines (118 loc) · 2.47 KB
/
main.go
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package db
import (
"encoding/json"
"encoding/base64"
couch "github.com/fjl/go-couchdb"
"log"
"net/http"
"io/ioutil"
"errors"
"golang.org/x/crypto/scrypt"
"fmt"
)
var client *couch.Client
var db *couch.DB
var userDb *couch.DB
var uuids []string
var Config DBConfig
type DBConfig struct {
Salt string
}
type ViewResponse struct {
TotalRows int `json:"total_rows"`
Offset int `json:"offset"`
Rows []interface{} `json:"rows"`
}
//todo: store password hash instead
type User struct {
Username string
Password string
}
func Connect() error {
var err error
client, err = couch.NewClient("http://localhost:5984", nil)
if err != nil {
return err
}
db, err = client.EnsureDB("budget")
if err != nil {
return err
}
userDb, err = client.EnsureDB("budget_users")
if err != nil {
return err
}
return nil
}
func LoginUser(user string, pass string) (string,error) {
options := make( couch.Options )
options["key"] = user
resp := ViewResponse{}
if err := userDb.View("_design/user","user",&resp, options); err != nil {
return "", err
}
if len(resp.Rows) == 0 {
return "",errors.New("User does not exist")
}
key,err := scrypt.Key( []byte(pass),[]byte(Config.Salt),16384,8,1,32)
if err != nil {
return "", err
}
passAttempt := base64.StdEncoding.EncodeToString(key)
row := resp.Rows[0].(map[string]interface{})
passEncoded := row["value"].(string)
if passEncoded != passAttempt {
return "", errors.New("User does not exist")
}
id, _ := row["id"].(string)
return id,nil
}
func CreateUser(u User) error {
uuid, err := nextUUID()
if err != nil {
return err
}
var pass []byte
pass, err = scrypt.Key( []byte(u.Password), []byte(Config.Salt),16384,8,1,32)
if err != nil {
return err
}
u.Password = base64.StdEncoding.EncodeToString(pass)
_, err = userDb.Put(uuid, u, "")
if err != nil {
return err
}
return nil
}
func nextUUID() (string, error) {
if len(uuids) == 0 {
err := getUUID()
if err != nil {
return "", err
}
}
uuid := uuids[0]
uuids = uuids[1:]
return uuid, nil
}
func getUUID() error {
res, err := http.Get("http://127.0.0.1:5984/_uuids?count=100")
if err != nil {
log.Fatal(err)
return err
}
defer res.Body.Close()
body, err := ioutil.ReadAll(res.Body)
if err != nil {
log.Fatal(err)
return err
}
var result map[string][]string
err = json.Unmarshal(body, &result)
if err != nil {
log.Fatal(err)
return err
}
uuids = result["uuids"]
return nil
}