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auth.go
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auth.go
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package auth
import (
"context"
"fmt"
"net/http"
"time"
"github.com/freonservice/freon/internal/app"
"github.com/freonservice/freon/internal/auth/cache"
"github.com/freonservice/freon/internal/auth/cache/memory"
api "github.com/freonservice/freon/pkg/freonApi"
"github.com/dgrijalva/jwt-go"
openapierrors "github.com/go-openapi/errors"
"github.com/google/uuid"
"github.com/pkg/errors"
"github.com/powerman/structlog"
)
const (
audienceToken = "freon"
issuerToken = "auth-freon" //nolint:gosec // this is not secret
cacheTTL = 10 * time.Second
)
var (
ErrTokenInvalid = openapierrors.New(http.StatusUnauthorized, "Token is invalid")
)
type (
auth struct {
storage cache.Storage
repo app.Repo
secretKey []byte
expTime time.Duration
logger *structlog.Logger
}
session struct {
UserID int64
Status int64
}
)
func NewAuth(secret string, repo app.Repo, expTime time.Duration, logger *structlog.Logger) app.Auth {
return &auth{
secretKey: []byte(secret),
repo: repo,
storage: memory.NewStorage(),
expTime: expTime,
logger: logger,
}
}
func (a *auth) IsAuthorized(accessToken string) (*app.UserSession, error) {
token, err := jwt.ParseWithClaims(accessToken, &jwt.StandardClaims{}, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("jwt: unexpected signing method %s %s", "alt", token.Header["alg"])
}
return a.secretKey, nil
})
if err != nil || !token.Valid {
return nil, ErrTokenInvalid
}
claims := token.Claims.(*jwt.StandardClaims)
if !claims.VerifyExpiresAt(time.Now().UTC().Unix(), true) {
return nil, ErrTokenInvalid
}
if claims.Audience != audienceToken || claims.Issuer != issuerToken {
a.logger.PrintErr("jwt: invalid claims", "aud", claims.Audience, "iss", claims.Issuer)
return nil, ErrTokenInvalid
}
uID, err := uuid.Parse(claims.Id)
if err != nil {
a.logger.PrintErr(errors.WithStack(err))
return nil, ErrTokenInvalid
}
sess, err := a.session(uID.String(), accessToken)
if err != nil {
a.logger.PrintErr(errors.WithStack(err))
return nil, ErrTokenInvalid
}
switch sess.Status {
case int64(api.UserStatus_USER_IS_BANNED):
return nil, app.ErrUserIsBanned
case int64(api.UserStatus_USER_NOT_ACTIVE):
return nil, app.ErrUserNotActive
default:
}
return &app.UserSession{
UserID: sess.UserID,
UserUUID: uID.String(),
}, nil
}
func (a *auth) GenerateAuthToken(uID uuid.UUID) (string, error) {
claims := jwt.StandardClaims{
Id: uID.String(),
Audience: audienceToken,
ExpiresAt: time.Now().UTC().Add(a.expTime).Unix(),
IssuedAt: time.Now().UTC().Unix(),
Issuer: issuerToken,
}
return jwt.NewWithClaims(jwt.SigningMethodHS256, &claims).SignedString(a.secretKey)
}
func (a *auth) session(userUUID, token string) (*session, error) {
item := a.storage.Get(userUUID)
if item != nil {
return &session{
UserID: item.UserID,
Status: item.Status,
}, nil
}
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) //nolint:gomnd
defer cancel()
sess, err := a.repo.SessionByAccessToken(ctx, token)
if err != nil {
a.logger.Println(errors.WithStack(err))
return nil, ErrTokenInvalid
}
a.storage.Set(userUUID, memory.Item{
UserID: sess.UserID,
Status: sess.User.Status,
Expiration: time.Now().UTC().Add(cacheTTL).Unix(),
})
return &session{
UserID: sess.UserID,
Status: sess.User.Status,
}, nil
}