auth0: support explicit domains in the service account (#2980)

* auth0: support explicit domains in the service account

* also handle FromOptions

internal/directory/auth0/auth0.go

@@ -4,8 +4,6 @@ package auth0
 
 import (
 	"context"
-	"encoding/base64"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"sort"
@@ -13,6 +11,7 @@ import (
 	"github.com/rs/zerolog"
 	"gopkg.in/auth0.v5/management"
 
+	"github.com/pomerium/pomerium/internal/encoding"
 	"github.com/pomerium/pomerium/internal/log"
 	"github.com/pomerium/pomerium/pkg/grpc/directory"
 )
@@ -36,6 +35,10 @@ type (
 type newManagersFunc = func(ctx context.Context, domain string, serviceAccount *ServiceAccount) (RoleManager, UserManager, error)
 
 func defaultNewManagersFunc(ctx context.Context, domain string, serviceAccount *ServiceAccount) (RoleManager, UserManager, error) {
+	// override the domain for the management api if supplied
+	if serviceAccount.Domain != "" {
+		domain = serviceAccount.Domain
+	}
 	m, err := management.New(domain,
 		management.WithClientCredentials(serviceAccount.ClientID, serviceAccount.Secret),
 		management.WithContext(ctx))
@@ -224,7 +227,9 @@ func getRoleUserIDs(rm RoleManager, roleID string) ([]string, error) {
 
 // A ServiceAccount is used by the Auth0 provider to query the API.
 type ServiceAccount struct {
+	Domain       string `json:"domain"`
 	ClientID     string `json:"client_id"`
+	ClientSecret string `json:"client_secret"`
 	Secret       string `json:"secret"`
 }
 
@@ -245,6 +250,15 @@ func parseServiceAccountFromOptions(clientID, clientSecret string) (*ServiceAcco
 	if serviceAccount.ClientID == "" {
 		return nil, fmt.Errorf("auth0: client_id is required")
 	}
+
+	// for backwards compatibility we support secret and client_secret
+	if serviceAccount.Secret == "" {
+		serviceAccount.Secret = serviceAccount.ClientSecret
+	}
+	if serviceAccount.ClientSecret == "" {
+		serviceAccount.ClientSecret = serviceAccount.Secret
+	}
+
 	if serviceAccount.Secret == "" {
 		return nil, fmt.Errorf("auth0: client_secret is required")
 	}
@@ -253,13 +267,8 @@ func parseServiceAccountFromOptions(clientID, clientSecret string) (*ServiceAcco
 }
 
 func parseServiceAccountFromString(rawServiceAccount string) (*ServiceAccount, error) {
-	bs, err := base64.StdEncoding.DecodeString(rawServiceAccount)
-	if err != nil {
-		return nil, fmt.Errorf("auth0: could not decode base64: %w", err)
-	}
-
 	var serviceAccount ServiceAccount
-	if err := json.Unmarshal(bs, &serviceAccount); err != nil {
+	if err := encoding.DecodeBase64OrJSON(rawServiceAccount, &serviceAccount); err != nil {
 		return nil, fmt.Errorf("auth0: could not unmarshal json: %w", err)
 	}
 
@@ -267,6 +276,14 @@ func parseServiceAccountFromString(rawServiceAccount string) (*ServiceAccount, e
 		return nil, errors.New("auth0: client_id is required")
 	}
 
+	// for backwards compatibility we support secret and client_secret
+	if serviceAccount.Secret == "" {
+		serviceAccount.Secret = serviceAccount.ClientSecret
+	}
+	if serviceAccount.ClientSecret == "" {
+		serviceAccount.ClientSecret = serviceAccount.Secret
+	}
+
 	if serviceAccount.Secret == "" {
 		return nil, errors.New("auth0: secret is required")
 	}

internal/directory/auth0/auth0_test.go

@@ -155,8 +155,8 @@ func stringPtr(in string) *string {
 }
 
 func TestProvider_UserGroups(t *testing.T) {
-	expectedDomain := "example.com"
-	expectedServiceAccount := &ServiceAccount{ClientID: "c_id", Secret: "secret"}
+	expectedDomain := "login.example.com"
+	expectedServiceAccount := &ServiceAccount{Domain: "login-example.auth0.com", ClientID: "c_id", Secret: "secret"}
 
 	tests := []struct {
 		name                         string
@@ -518,11 +518,31 @@ func TestParseServiceAccount(t *testing.T) {
 			"valid", "eyJjbGllbnRfaWQiOiJpLWFtLWNsaWVudC1pZCIsInNlY3JldCI6ImktYW0tc2VjcmV0In0K",
 			&ServiceAccount{
 				ClientID:     "i-am-client-id",
+				ClientSecret: "i-am-secret",
 				Secret:       "i-am-secret",
 			},
 			nil,
 		},
-		{"base64 err", "!!!!", nil, errors.New("auth0: could not decode base64: illegal base64 data at input byte 0")},
+		{
+			"json", `{"client_id": "i-am-client-id", "client_secret": "i-am-secret"}`,
+			&ServiceAccount{
+				ClientID:     "i-am-client-id",
+				ClientSecret: "i-am-secret",
+				Secret:       "i-am-secret",
+			},
+			nil,
+		},
+		{
+			"domain", `{"domain": "example.auth0.com", "client_id": "i-am-client-id", "client_secret": "i-am-secret"}`,
+			&ServiceAccount{
+				ClientID:     "i-am-client-id",
+				ClientSecret: "i-am-secret",
+				Domain:       "example.auth0.com",
+				Secret:       "i-am-secret",
+			},
+			nil,
+		},
+		{"base64 err", "!!!!", nil, errors.New("auth0: could not unmarshal json: illegal base64 data at input byte 0")},
 		{"json err", "PAo=", nil, errors.New("auth0: could not unmarshal json: invalid character '<' looking for beginning of value")},
 		{"no client_id", "eyJzZWNyZXQiOiJpLWFtLXNlY3JldCJ9Cg==", nil, errors.New("auth0: client_id is required")},
 		{"no secret", "eyJjbGllbnRfaWQiOiJpLWFtLWNsaWVudC1pZCJ9Cg==", nil, errors.New("auth0: secret is required")},