Add some test to validate the configuration

cmd/dex/config.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"strings"
 
 	"golang.org/x/crypto/bcrypt"
 
@@ -48,6 +49,38 @@ type Config struct {
 	StaticPasswords []password `json:"staticPasswords"`
 }
 
+//Validate the configuration
+func (c Config) Validate() error {
+	// Fast checks. Perform these first for a more responsive CLI.
+	checks := []struct {
+		bad    bool
+		errMsg string
+	}{
+		{c.Issuer == "", "no issuer specified in config file"},
+		{!c.EnablePasswordDB && len(c.StaticPasswords) != 0, "cannot specify static passwords without enabling password db"},
+		{c.Storage.Config == nil, "no storage supplied in config file"},
+		{c.Web.HTTP == "" && c.Web.HTTPS == "", "must supply a HTTP/HTTPS  address to listen on"},
+		{c.Web.HTTPS != "" && c.Web.TLSCert == "", "no cert specified for HTTPS"},
+		{c.Web.HTTPS != "" && c.Web.TLSKey == "", "no private key specified for HTTPS"},
+		{c.GRPC.TLSCert != "" && c.GRPC.Addr == "", "no address specified for gRPC"},
+		{c.GRPC.TLSKey != "" && c.GRPC.Addr == "", "no address specified for gRPC"},
+		{(c.GRPC.TLSCert == "") != (c.GRPC.TLSKey == ""), "must specific both a gRPC TLS cert and key"},
+		{c.GRPC.TLSCert == "" && c.GRPC.TLSClientCA != "", "cannot specify gRPC TLS client CA without a gRPC TLS cert"},
+	}
+
+	var checkErrors []string
+
+	for _, check := range checks {
+		if check.bad {
+			checkErrors = append(checkErrors, check.errMsg)
+		}
+	}
+	if len(checkErrors) != 0 {
+		return fmt.Errorf("Invalid Config:\n\t-\t%s", strings.Join(checkErrors, "\n\t-\t"))
+	}
+	return nil
+}
+
 type password storage.Password
 
 func (p *password) UnmarshalJSON(b []byte) error {

cmd/dex/config_test.go

@@ -14,6 +14,47 @@ import (
 
 var _ = yaml.YAMLToJSON
 
+func TestValidConfiguration(t *testing.T) {
+	configuration := Config{
+		Issuer: "http://127.0.0.1:5556/dex",
+		Storage: Storage{
+			Type: "sqlite3",
+			Config: &sql.SQLite3{
+				File: "examples/dex.db",
+			},
+		},
+		Web: Web{
+			HTTP: "127.0.0.1:5556",
+		},
+		StaticConnectors: []Connector{
+			{
+				Type:   "mockCallback",
+				ID:     "mock",
+				Name:   "Example",
+				Config: &mock.CallbackConfig{},
+			},
+		},
+	}
+	if err := configuration.Validate(); err != nil {
+		t.Fatalf("this configuration should have been valid: %v", err)
+	}
+}
+
+func TestInvalidConfiguration(t *testing.T) {
+	configuration := Config{}
+	err := configuration.Validate()
+	if err == nil {
+		t.Fatal("this configuration should be invalid")
+	}
+	got := err.Error()
+	wanted := `Invalid Config:
+	-	no issuer specified in config file
+	-	no storage supplied in config file
+	-	must supply a HTTP/HTTPS  address to listen on`
+	if got != wanted {
+		t.Fatalf("Expected error message to be %q, got %q", wanted, got)
+	}
+}
 func TestUnmarshalConfig(t *testing.T) {
 	rawConfig := []byte(`
 issuer: http://127.0.0.1:5556/dex

cmd/dex/serve.go

@@ -71,28 +71,8 @@ func serve(cmd *cobra.Command, args []string) error {
 	if c.Logger.Level != "" {
 		logger.Infof("config using log level: %s", c.Logger.Level)
 	}
-
+	if err := c.Validate(); err != nil {
-	// Fast checks. Perform these first for a more responsive CLI.
+		return err
-	checks := []struct {
-		bad    bool
-		errMsg string
-	}{
-		{c.Issuer == "", "no issuer specified in config file"},
-		{!c.EnablePasswordDB && len(c.StaticPasswords) != 0, "cannot specify static passwords without enabling password db"},
-		{c.Storage.Config == nil, "no storage supplied in config file"},
-		{c.Web.HTTP == "" && c.Web.HTTPS == "", "must supply a HTTP/HTTPS  address to listen on"},
-		{c.Web.HTTPS != "" && c.Web.TLSCert == "", "no cert specified for HTTPS"},
-		{c.Web.HTTPS != "" && c.Web.TLSKey == "", "no private key specified for HTTPS"},
-		{c.GRPC.TLSCert != "" && c.GRPC.Addr == "", "no address specified for gRPC"},
-		{c.GRPC.TLSKey != "" && c.GRPC.Addr == "", "no address specified for gRPC"},
-		{(c.GRPC.TLSCert == "") != (c.GRPC.TLSKey == ""), "must specific both a gRPC TLS cert and key"},
-		{c.GRPC.TLSCert == "" && c.GRPC.TLSClientCA != "", "cannot specify gRPC TLS client CA without a gRPC TLS cert"},
-	}
-
-	for _, check := range checks {
-		if check.bad {
-			return fmt.Errorf("invalid config: %s", check.errMsg)
-		}
 	}
 
 	logger.Infof("config issuer: %s", c.Issuer)