test: add test for DecodeIDToken

handler/openid/strategy_jwt_test.go

@@ -10,8 +10,10 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"github.com/ory/fosite"
+	"github.com/ory/fosite/internal/gen"
 	"github.com/ory/fosite/token/jwt"
 )
 
@@ -283,3 +285,86 @@ func TestJWTStrategy_GenerateIDToken(t *testing.T) {
 		})
 	}
 }
+
+func TestJWTStrategy_DecodeIDToken(t *testing.T) {
+	var j = &DefaultStrategy{
+		Signer: &jwt.DefaultSigner{
+			GetPrivateKey: func(_ context.Context) (interface{}, error) {
+				return key, nil
+			}},
+		Config: &fosite.Config{
+			MinParameterEntropy: fosite.MinParameterEntropy,
+		},
+	}
+
+	var anotherKey = gen.MustRSAKey()
+
+	var genIDToken = func(c jwt.IDTokenClaims) string {
+		s, _, err := j.Generate(context.TODO(), c.ToMapClaims(), jwt.NewHeaders())
+		require.NoError(t, err)
+		return s
+	}
+
+	var token string
+	var decoder *DefaultStrategy
+	for k, c := range []struct {
+		description string
+		setup       func()
+		expectErr   bool
+	}{
+		{
+			description: "should pass with valid token",
+			setup: func() {
+				token = genIDToken(jwt.IDTokenClaims{
+					Subject:     "peter",
+					RequestedAt: time.Now(),
+					ExpiresAt:   time.Now().Add(time.Hour),
+				})
+				decoder = j
+			},
+			expectErr: false,
+		},
+		{
+			description: "should pass even though token is expired",
+			setup: func() {
+				token = genIDToken(jwt.IDTokenClaims{
+					Subject:     "peter",
+					RequestedAt: time.Now(),
+					ExpiresAt:   time.Now().Add(-time.Hour),
+				})
+				decoder = j
+			},
+			expectErr: false,
+		},
+		{
+			description: "should fail because token is decoded with wrong key",
+			setup: func() {
+				token = genIDToken(jwt.IDTokenClaims{
+					Subject:     "peter",
+					RequestedAt: time.Now(),
+					ExpiresAt:   time.Now().Add(time.Hour),
+				})
+				decoder = &DefaultStrategy{
+					Signer: &jwt.DefaultSigner{
+						GetPrivateKey: func(_ context.Context) (interface{}, error) {
+							return anotherKey, nil
+						}},
+					Config: &fosite.Config{
+						MinParameterEntropy: fosite.MinParameterEntropy,
+					},
+				}
+			},
+			expectErr: true,
+		},
+	} {
+		t.Run(fmt.Sprintf("case=%d/description=%s", k, c.description), func(t *testing.T) {
+			c.setup()
+			req := fosite.NewAccessRequest(&DefaultSession{})
+			idtoken, err := decoder.DecodeIDToken(context.Background(), req, token)
+			assert.Equal(t, c.expectErr, err != nil, "%d: %+v", k, err)
+			if !c.expectErr {
+				assert.NotNil(t, idtoken)
+			}
+		})
+	}
+}