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Using `errors.As` to check for validation errors

This commit is contained in:
Christian Banse 2021-11-29 21:23:48 +01:00
parent a725c1f60c
commit 957802ced4
2 changed files with 21 additions and 12 deletions
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15
example_test.go
View File

@ -1,6 +1,7 @@
package jwt_test package jwt_test
import ( import (
"errors"
"fmt" "fmt"
"time" "time"
@ -94,16 +95,22 @@ func ExampleParseWithClaims_customClaimsType() {
// An example of parsing the error types using bitfield checks // An example of parsing the error types using bitfield checks
func ExampleParse_errorChecking() { func ExampleParse_errorChecking() {
// Token from another example. This token is expired var (
var tokenString = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c" token *jwt.Token
ve *jwt.ValidationError
err error
)
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) { // Token from another example. This token is expired
tokenString := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c"
token, err = jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
return []byte("AllYourBase"), nil return []byte("AllYourBase"), nil
}) })
if token.Valid { if token.Valid {
fmt.Println("You look nice today") fmt.Println("You look nice today")
} else if ve, ok := err.(*jwt.ValidationError); ok { } else if errors.As(err, &ve) {
if ve.Errors&jwt.ValidationErrorMalformed != 0 { if ve.Errors&jwt.ValidationErrorMalformed != 0 {
fmt.Println("That's not even a token") fmt.Println("That's not even a token")
} else if ve.Errors&(jwt.ValidationErrorExpired|jwt.ValidationErrorNotValidYet) != 0 { } else if ve.Errors&(jwt.ValidationErrorExpired|jwt.ValidationErrorNotValidYet) != 0 {

6
parser_test.go
View File

@ -4,6 +4,7 @@ import (
"crypto" "crypto"
"crypto/rsa" "crypto/rsa"
"encoding/json" "encoding/json"
"errors"
"fmt" "fmt"
"reflect" "reflect"
"testing" "testing"
@ -325,6 +326,7 @@ func TestParser_Parse(t *testing.T) {
// Parse the token // Parse the token
var token *jwt.Token var token *jwt.Token
var ve *jwt.ValidationError
var err error var err error
var parser = data.parser var parser = data.parser
if parser == nil { if parser == nil {
@ -361,8 +363,7 @@ func TestParser_Parse(t *testing.T) {
if err == nil { if err == nil {
t.Errorf("[%v] Expecting error. Didn't get one.", data.name) t.Errorf("[%v] Expecting error. Didn't get one.", data.name)
} else { } else {
if errors.As(err, &ve) {
ve := err.(*jwt.ValidationError)
// compare the bitfield part of the error // compare the bitfield part of the error
if e := ve.Errors; e != data.errors { if e := ve.Errors; e != data.errors {
t.Errorf("[%v] Errors don't match expectation. %v != %v", data.name, e, data.errors) t.Errorf("[%v] Errors don't match expectation. %v != %v", data.name, e, data.errors)
@ -373,6 +374,7 @@ func TestParser_Parse(t *testing.T) {
} }
} }
} }
}
if data.valid { if data.valid {
if token.Signature == "" { if token.Signature == "" {
t.Errorf("[%v] Signature is left unpopulated after parsing", data.name) t.Errorf("[%v] Signature is left unpopulated after parsing", data.name)