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gor-auth.go
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gor-auth.go
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// Package providing oauth2 authentication
// for go-oneroster-api service
package gorauth
import (
"database/sql"
sq "github.com/Masterminds/squirrel"
jwt "github.com/dgrijalva/jwt-go"
"github.com/go-chi/jwtauth"
_ "github.com/mattn/go-sqlite3"
log "github.com/sirupsen/logrus"
"golang.org/x/crypto/bcrypt"
errors "golang.org/x/xerrors"
"os"
"time"
)
type conf struct {
DBDriver string
DBName string
Key string
KeyAlg string
}
var c conf
func init() {
err := c.envs()
if err != nil {
log.Error(err)
}
}
func Login(u, p string) (string, error) {
db := c.database()
defer db.Close()
err := validateSecret(u, p, db)
if err != nil {
log.Infof("Bad login: %v", u)
log.Error(err)
//TODO: 401
return "", err
}
t, err := c.createToken(u)
if err != nil {
// review
log.Error(err)
return "", err
}
return t, nil
}
func (c *conf) envs() error {
var ok bool
c.DBDriver, ok = os.LookupEnv("GOR_AUTH_DBDRIVER")
if c.DBDriver == "" || !ok {
return errors.New("Unknown Database Driver, set GOR_AUTH_DBDRIVER")
}
c.DBName, ok = os.LookupEnv("GOR_AUTH_DBNAME")
if !ok {
return errors.New("No Database, set GOR_AUTH_DBNAME")
}
if c.DBName == "" {
c.DBName = ":memory:"
}
c.Key, ok = os.LookupEnv("GOR_AUTH_KEY")
if !ok {
return errors.New("No key, set GOR_AUTH_KEY")
}
c.KeyAlg, ok = os.LookupEnv("GOR_AUTH_KEYALG")
if !ok {
return errors.New("No encrypt algorithm, set GOR_AUTH_KEYALG=HS256")
}
return nil
}
func (conf *conf) database() *sql.DB {
var c *sql.DB
c, err := sql.Open(conf.DBDriver, conf.DBName)
if err != nil {
log.Error(err)
return c
}
return c
}
func getSecret(id string, db *sql.DB) (string, error) {
var s string
rows, err := sq.
Select("client_secret_hash").
From("creds").
Where("client_id = ?", id).
RunWith(db).
Query()
if err != nil {
// todo: placeholder
return "", err
}
for rows.Next() {
err = rows.Scan(&s)
if err != nil {
log.Error(err)
}
}
return s, nil
}
func validateSecret(u, p string, db *sql.DB) error {
hash, err := getSecret(u, db)
if err != nil {
return err
}
h := []byte(hash)
b := []byte(p)
err = bcrypt.CompareHashAndPassword(h, b)
if err != nil {
return err
}
return nil
}
func (c *conf) createToken(u string) (string, error) {
tokenAuth := jwtauth.New(c.KeyAlg, []byte(c.Key), nil)
t := jwt.MapClaims{"aud": u}
jwtauth.SetIssuedNow(t)
jwtauth.SetExpiryIn(t, (time.Duration(30 * time.Minute)))
_, tokenString, err := tokenAuth.Encode(t)
if err != nil {
return "", err
}
return tokenString, nil
}