refactor(auth): modularize auth plugin with physical subpackages and decoupled services

backend/plugins/domain/auth/service/auth_registry.go

@@ -0,0 +1,49 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+// Package service implements domain business services and orchestration for the auth plugin.
+package service
+
+import (
+	"Wavelet/core/contracts"
+	"sync"
+)
+
+// AuthRegistryImpl implements contracts.AuthRegistry.
+type AuthRegistryImpl struct {
+	mu        sync.RWMutex
+	providers map[string]contracts.OAuthProvider
+}
+
+// NewAuthRegistry creates a new AuthRegistryImpl.
+func NewAuthRegistry() *AuthRegistryImpl {
+	return &AuthRegistryImpl{
+		providers: make(map[string]contracts.OAuthProvider),
+	}
+}
+
+// RegisterOAuthProvider registers an OAuthProvider by name.
+func (r *AuthRegistryImpl) RegisterOAuthProvider(name string, provider contracts.OAuthProvider) {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	r.providers[name] = provider
+}
+
+// GetOAuthProvider retrieves an OAuthProvider by name.
+func (r *AuthRegistryImpl) GetOAuthProvider(name string) (contracts.OAuthProvider, bool) {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	p, ok := r.providers[name]
+	return p, ok
+}
+
+// ListOAuthProviders lists all registered provider names.
+func (r *AuthRegistryImpl) ListOAuthProviders() []string {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	res := make([]string, 0, len(r.providers))
+	for name := range r.providers {
+		res = append(res, name)
+	}
+	return res
+}