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// Copyright 2021 Google LLC.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package downscope
import (
"context"
"flag"
"fmt"
"io/ioutil"
"log"
"os"
"testing"
"time"
"google.golang.org/api/option"
"golang.org/x/oauth2"
"golang.org/x/oauth2/google"
"golang.org/x/oauth2/google/downscope"
storage "google.golang.org/api/storage/v1"
"google.golang.org/api/transport"
)
const (
rootTokenScope = "https://www.googleapis.com/auth/cloud-platform"
envServiceAccountFile = "GCLOUD_TESTS_GOLANG_KEY"
object1 = "cab-first-c45wknuy.txt"
object2 = "cab-second-c45wknuy.txt"
bucket = "dulcet-port-762"
)
var (
rootCredential *google.Credentials
)
// TestMain contains all of the setup code that needs to be run once before any of the tests are run
func TestMain(m *testing.M) {
flag.Parse()
if testing.Short() {
// This line runs all of our individual tests
os.Exit(m.Run())
}
ctx := context.Background()
credentialFileName := os.Getenv(envServiceAccountFile)
var err error
rootCredential, err = transport.Creds(ctx, option.WithCredentialsFile(credentialFileName), option.WithScopes(rootTokenScope))
if err != nil {
log.Fatalf("failed to construct root credential: %v", err)
}
// This line runs all of our individual tests
os.Exit(m.Run())
}
// downscopeTest holds the parameters necessary for running a test of the token downscoping capabilities implemented in `oauth2/google/downscope`
type downscopeTest struct {
name string
availableResource string
availablePermissions []string
condition downscope.AvailabilityCondition
objectName string
rootSource oauth2.TokenSource
expectError bool
}
func TestDownscopedToken(t *testing.T) {
if testing.Short() {
t.Skip("skipping integration test")
}
var downscopeTests = []downscopeTest{
{
name: "successfulDownscopedRead",
availableResource: "//storage.googleapis.com/projects/_/buckets/" + bucket,
availablePermissions: []string{"inRole:roles/storage.objectViewer"},
condition: downscope.AvailabilityCondition{
Expression: "resource.name.startsWith('projects/_/buckets/" + bucket + "/objects/" + object1 + "')",
},
rootSource: rootCredential.TokenSource,
objectName: object1,
expectError: false,
},
{
name: "readWithoutPermission",
availableResource: "//storage.googleapis.com/projects/_/buckets/" + bucket,
availablePermissions: []string{"inRole:roles/storage.objectViewer"},
condition: downscope.AvailabilityCondition{
Expression: "resource.name.startsWith('projects/_/buckets/" + bucket + "/objects/" + object1 + "')",
},
rootSource: rootCredential.TokenSource,
objectName: object2,
expectError: true,
},
}
for _, tt := range downscopeTests {
t.Run(tt.name, func(t *testing.T) {
err := downscopeQuery(t, tt)
// If a test isn't supposed to fail, it shouldn't fail.
if !tt.expectError && err != nil {
t.Errorf("test case %v should have succeeded, but instead returned %v", tt.name, err)
} else if tt.expectError && err == nil { // If a test is supposed to fail, it should return a non-nil error.
t.Errorf(" test case %v should have returned an error, but instead returned nil", tt.name)
}
})
}
}
// I'm not sure what I should name this according to convention.
func downscopeQuery(t *testing.T, tt downscopeTest) error {
t.Helper()
ctx := context.Background()
// Initializes an accessBoundary
var AccessBoundaryRules []downscope.AccessBoundaryRule
AccessBoundaryRules = append(AccessBoundaryRules, downscope.AccessBoundaryRule{AvailableResource: tt.availableResource, AvailablePermissions: tt.availablePermissions, Condition: &tt.condition})
downscopedTokenSource, err := downscope.NewTokenSource(context.Background(), downscope.DownscopingConfig{RootSource: tt.rootSource, Rules: AccessBoundaryRules})
if err != nil {
return fmt.Errorf("failed to create the initial token source: %v", err)
}
downscopedTokenSource = oauth2.ReuseTokenSource(nil, downscopedTokenSource)
ctx, cancel := context.WithTimeout(ctx, time.Second*30)
defer cancel()
storageService, err := storage.NewService(ctx, option.WithTokenSource(downscopedTokenSource))
if err != nil {
return fmt.Errorf("failed to create the storage service: %v", err)
}
resp, err := storageService.Objects.Get(bucket, tt.objectName).Download()
if err != nil {
return fmt.Errorf("failed to retrieve object from GCP project with error: %v", err)
}
defer resp.Body.Close()
_, err = ioutil.ReadAll(resp.Body)
if err != nil {
return fmt.Errorf("ioutil.ReadAll: %v", err)
}
return nil
}
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