Refactored and added client credentials flow

internal/flows/login.go

@@ -0,0 +1,28 @@
+package flows
+
+import (
+	opaal "davidallendj/opaal/internal"
+	"fmt"
+)
+
+func Login(config *opaal.Config) error {
+	if config == nil {
+		return fmt.Errorf("config is not valid")
+	}
+
+	// initialize client that will be used throughout login flow
+	server := opaal.NewServerWithConfig(config)
+	client := opaal.NewClientWithConfig(config)
+
+	fmt.Printf("grant type: %v\n", config.GrantType)
+
+	if config.GrantType == "authorization_code" {
+		AuthorizationCode(config, server, client)
+	} else if config.GrantType == "client_credentials" {
+		ClientCredentials(config, server, client)
+	} else {
+		return fmt.Errorf("invalid grant type")
+	}
+
+	return nil
+}