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builder.go
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/
builder.go
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package google_token_source
import (
"context"
"fmt"
"github.com/nais/teams-backend/pkg/config"
"golang.org/x/oauth2"
admin_directory "google.golang.org/api/admin/directory/v1"
"google.golang.org/api/cloudresourcemanager/v3"
"google.golang.org/api/impersonate"
)
type Builder struct {
serviceAccountEmail string
subjectEmail string
}
func NewFromConfig(cfg *config.Config) (*Builder, error) {
if cfg.GoogleManagementProjectID == "" {
return nil, fmt.Errorf("missing required configuration: TEAMS_BACKEND_GOOGLE_MANAGEMENT_PROJECT_ID")
}
if cfg.TenantDomain == "" {
return nil, fmt.Errorf("missing required configuration: TEAMS_BACKEND_TENANT_DOMAIN")
}
return &Builder{
serviceAccountEmail: fmt.Sprintf("console@%s.iam.gserviceaccount.com", cfg.GoogleManagementProjectID),
subjectEmail: "nais-console@" + cfg.TenantDomain,
}, nil
}
func (g Builder) impersonateTokenSource(ctx context.Context, delegate bool, scopes []string) (oauth2.TokenSource, error) {
impersonateConfig := impersonate.CredentialsConfig{
TargetPrincipal: g.serviceAccountEmail,
Scopes: scopes,
}
if delegate {
impersonateConfig.Subject = g.subjectEmail
}
return impersonate.CredentialsTokenSource(ctx, impersonateConfig)
}
func (g Builder) Admin(ctx context.Context) (oauth2.TokenSource, error) {
return g.impersonateTokenSource(ctx, true, []string{
admin_directory.AdminDirectoryUserReadonlyScope,
admin_directory.AdminDirectoryGroupScope,
})
}
func (g Builder) GCP(ctx context.Context) (oauth2.TokenSource, error) {
return g.impersonateTokenSource(ctx, false, []string{
cloudresourcemanager.CloudPlatformScope,
})
}