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|
package appcheck
import (
"context"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"net/http"
"net/http/httptest"
"os"
"testing"
"time"
"firebase.google.com/go/v4/internal"
"github.com/golang-jwt/jwt/v4"
"github.com/google/go-cmp/cmp"
)
func TestVerifyTokenHasValidClaims(t *testing.T) {
ts, err := setupFakeJWKS()
if err != nil {
t.Fatalf("Error setting up fake JWKS server: %v", err)
}
defer ts.Close()
privateKey, err := loadPrivateKey()
if err != nil {
t.Fatalf("Error loading private key: %v", err)
}
JWKSUrl = ts.URL
conf := &internal.AppCheckConfig{
ProjectID: "project_id",
}
client, err := NewClient(context.Background(), conf)
if err != nil {
t.Errorf("Error creating NewClient: %v", err)
}
type appCheckClaims struct {
Aud []string `json:"aud"`
jwt.RegisteredClaims
}
mockTime := time.Date(2020, time.January, 1, 0, 0, 0, 0, time.UTC)
jwt.TimeFunc = func() time.Time {
return mockTime
}
tokenTests := []struct {
claims *appCheckClaims
wantErr error
wantToken *DecodedAppCheckToken
}{
{
&appCheckClaims{
[]string{"projects/12345678", "projects/project_id"},
jwt.RegisteredClaims{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
ExpiresAt: jwt.NewNumericDate(mockTime.Add(time.Hour)),
IssuedAt: jwt.NewNumericDate(mockTime),
}},
nil,
&DecodedAppCheckToken{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
Audience: []string{"projects/12345678", "projects/project_id"},
ExpiresAt: mockTime.Add(time.Hour),
IssuedAt: mockTime,
AppID: "12345678:app:ID",
Claims: map[string]interface{}{},
},
}, {
&appCheckClaims{
[]string{"projects/12345678", "projects/project_id"},
jwt.RegisteredClaims{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
ExpiresAt: jwt.NewNumericDate(mockTime.Add(time.Hour)),
IssuedAt: jwt.NewNumericDate(mockTime),
// A field our AppCheckToken does not use.
NotBefore: jwt.NewNumericDate(mockTime.Add(-1 * time.Hour)),
}},
nil,
&DecodedAppCheckToken{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
Audience: []string{"projects/12345678", "projects/project_id"},
ExpiresAt: mockTime.Add(time.Hour),
IssuedAt: mockTime,
AppID: "12345678:app:ID",
Claims: map[string]interface{}{
"nbf": float64(mockTime.Add(-1 * time.Hour).Unix()),
},
},
}, {
&appCheckClaims{
[]string{"projects/0000000", "projects/another_project_id"},
jwt.RegisteredClaims{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
ExpiresAt: jwt.NewNumericDate(mockTime.Add(time.Hour)),
IssuedAt: jwt.NewNumericDate(mockTime),
}},
ErrTokenAudience,
nil,
}, {
&appCheckClaims{
[]string{"projects/12345678", "projects/project_id"},
jwt.RegisteredClaims{
Issuer: "https://not-firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
ExpiresAt: jwt.NewNumericDate(mockTime.Add(time.Hour)),
IssuedAt: jwt.NewNumericDate(mockTime),
}},
ErrTokenIssuer,
nil,
}, {
&appCheckClaims{
[]string{"projects/12345678", "projects/project_id"},
jwt.RegisteredClaims{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "",
ExpiresAt: jwt.NewNumericDate(mockTime.Add(time.Hour)),
IssuedAt: jwt.NewNumericDate(mockTime),
}},
ErrTokenSubject,
nil,
}, {
&appCheckClaims{
[]string{"projects/12345678", "projects/project_id"},
jwt.RegisteredClaims{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
ExpiresAt: jwt.NewNumericDate(mockTime.Add(time.Hour)),
IssuedAt: jwt.NewNumericDate(mockTime),
}},
ErrTokenSubject,
nil,
},
}
for _, tc := range tokenTests {
// Create an App Check-style token.
jwtToken := jwt.NewWithClaims(jwt.SigningMethodRS256, tc.claims)
// kid matches the key ID in testdata/mock.jwks.json,
// which is the public key matching to the private key
// in testdata/appcheck_pk.pem.
jwtToken.Header["kid"] = "FGQdnRlzAmKyKr6-Hg_kMQrBkj_H6i6ADnBQz4OI6BU"
token, err := jwtToken.SignedString(privateKey)
if err != nil {
t.Fatalf("error generating JWT: %v", err)
}
// Verify the token.
gotToken, gotErr := client.VerifyToken(token)
if !errors.Is(gotErr, tc.wantErr) {
t.Errorf("Expected error %v, got %v", tc.wantErr, gotErr)
continue
}
if diff := cmp.Diff(tc.wantToken, gotToken); diff != "" {
t.Errorf("VerifyToken mismatch (-want +got):\n%s", diff)
}
}
}
func TestVerifyTokenMustExist(t *testing.T) {
ts, err := setupFakeJWKS()
if err != nil {
t.Fatalf("Error setting up fake JWK server: %v", err)
}
defer ts.Close()
JWKSUrl = ts.URL
conf := &internal.AppCheckConfig{
ProjectID: "project_id",
}
client, err := NewClient(context.Background(), conf)
if err != nil {
t.Errorf("Error creating NewClient: %v", err)
}
for _, token := range []string{"", "-", "."} {
gotToken, gotErr := client.VerifyToken(token)
if gotErr == nil {
t.Errorf("VerifyToken(%s) expected error, got nil", token)
}
if gotToken != nil {
t.Errorf("Expected nil, got token %v", gotToken)
}
}
}
func TestVerifyTokenNotExpired(t *testing.T) {
ts, err := setupFakeJWKS()
if err != nil {
t.Fatalf("Error setting up fake JWKS server: %v", err)
}
defer ts.Close()
privateKey, err := loadPrivateKey()
if err != nil {
t.Fatalf("Error loading private key: %v", err)
}
JWKSUrl = ts.URL
conf := &internal.AppCheckConfig{
ProjectID: "project_id",
}
client, err := NewClient(context.Background(), conf)
if err != nil {
t.Errorf("Error creating NewClient: %v", err)
}
mockTime := time.Date(2020, time.January, 1, 0, 0, 0, 0, time.UTC)
jwt.TimeFunc = func() time.Time {
return mockTime
}
tokenTests := []struct {
expiresAt time.Time
wantErr bool
}{
// Expire in the future is OK.
{mockTime.Add(time.Hour), false},
// Expire in the past is not OK.
{mockTime.Add(-1 * time.Hour), true},
}
for _, tc := range tokenTests {
claims := struct {
Aud []string `json:"aud"`
jwt.RegisteredClaims
}{
[]string{"projects/12345678", "projects/project_id"},
jwt.RegisteredClaims{
Issuer: "https://firebaseappcheck.googleapis.com/12345678",
Subject: "12345678:app:ID",
ExpiresAt: jwt.NewNumericDate(tc.expiresAt),
IssuedAt: jwt.NewNumericDate(mockTime),
},
}
jwtToken := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
jwtToken.Header["kid"] = "FGQdnRlzAmKyKr6-Hg_kMQrBkj_H6i6ADnBQz4OI6BU"
token, err := jwtToken.SignedString(privateKey)
if err != nil {
t.Fatalf("error generating JWT: %v", err)
}
_, gotErr := client.VerifyToken(token)
if tc.wantErr && gotErr == nil {
t.Errorf("Expected an error, got none")
} else if !tc.wantErr && gotErr != nil {
t.Errorf("Expected no error, got %v", gotErr)
}
}
}
func setupFakeJWKS() (*httptest.Server, error) {
jwks, err := os.ReadFile("../testdata/mock.jwks.json")
if err != nil {
return nil, err
}
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Write(jwks)
}))
return ts, nil
}
func loadPrivateKey() (*rsa.PrivateKey, error) {
pk, err := os.ReadFile("../testdata/appcheck_pk.pem")
if err != nil {
return nil, err
}
block, _ := pem.Decode(pk)
privateKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return privateKey, nil
}
|
