add: auth add generate options Expiry for set token expires (#1319)

Co-authored-by: mlboy <ml3@meitu.com>
Co-authored-by: Asim Aslam <asim@aslam.me>

auth/jwt/jwt.go

@@ -3,7 +3,6 @@ package jwt
 import (
 	"encoding/base64"
 	"errors"
-	"time"
 
 	"github.com/dgrijalva/jwt-go"
 	"github.com/micro/go-micro/v2/auth"
@@ -77,7 +76,7 @@ func (s *svc) Generate(id string, ops ...auth.GenerateOption) (*auth.Account, er
 	account := jwt.NewWithClaims(jwt.SigningMethodRS256, AuthClaims{
 		id, options.Roles, options.Metadata, jwt.StandardClaims{
 			Subject:   id,
-			ExpiresAt: time.Now().Add(time.Hour * 24).Unix(),
+			ExpiresAt: options.Expiry.Unix(),
 		},
 	})
 

auth/options.go

@@ -1,6 +1,10 @@
 package auth
 
-import "github.com/micro/go-micro/v2/auth/provider"
+import (
+	"time"
+
+	"github.com/micro/go-micro/v2/auth/provider"
+)
 
 type Options struct {
 	// Token is an auth token
@@ -66,6 +70,8 @@ type GenerateOptions struct {
 	Metadata map[string]string
 	// Roles/scopes associated with the account
 	Roles []*Role
+	//Expiry of the token
+	Expiry time.Time
 }
 
 type GenerateOption func(o *GenerateOptions)
@@ -84,12 +90,22 @@ func Roles(rs []*Role) func(o *GenerateOptions) {
 	}
 }
 
+// Expiry for the generated account's token expires
+func Expiry(ex time.Time) func(o *GenerateOptions) {
+	return func(o *GenerateOptions) {
+		o.Expiry = ex
+	}
+}
+
 // NewGenerateOptions from a slice of options
 func NewGenerateOptions(opts ...GenerateOption) GenerateOptions {
 	var options GenerateOptions
 	for _, o := range opts {
 		o(&options)
 	}
-
+	//set defualt expiry of token
+	if options.Expiry.IsZero() {
+		options.Expiry = time.Now().Add(time.Hour * 24)
+	}
 	return options
 }