服务端参考实现

概述

本文档提供ATH协议服务端的参考实现指南,开发者可以基于此实现完整的服务端功能。

核心模块

1. 身份管理模块

负责管理服务端DID身份和公私钥对:
class IdentityManager:
    def __init__(self):
        self.did = None
        self.private_key = None
        self.public_key = None
    
    def load_identity(self, file_path):
        # 从文件加载身份信息
        pass
    
    def sign(self, data):
        # 使用私钥对数据签名
        pass
    
    def verify_signature(self, public_key, data, signature):
        # 验证客户端签名
        pass

2. 授权确认模块

负责向用户确认授权请求:
class AuthorizationConfirmation:
    def __init__(self):
        self.notification_channels = ["sms", "email", "app_push"]
    
    def send_confirmation_request(self, user_id, client_info, scopes):
        # 向用户发送授权确认请求
        pass
    
    def verify_confirmation_response(self, response):
        # 验证用户确认响应的签名
        pass
    
    def get_authorization_result(self, request_id):
        # 查询用户授权结果
        pass

3. 权限管理模块

负责权限审批和访问控制:
class PermissionManager:
    def __init__(self):
        self.permission_policies = {}
    
    def validate_scopes(self, requested_scopes, user_authorization):
        # 验证请求的权限是否在用户授权范围内
        pass
    
    def apply_policies(self, scopes, client_info):
        # 应用安全策略,调整权限范围
        pass
    
    def generate_access_token(self, client_did, user_id, scopes, ttl):
        # 生成签名的访问令牌
        pass

4. 握手服务模块

负责实现完整的握手流程:
class HandshakeService:
    def __init__(self, identity_manager, auth_confirmation, permission_manager):
        self.identity_manager = identity_manager
        self.auth_confirmation = auth_confirmation
        self.permission_manager = permission_manager
        self.sessions = {}
    
    def handle_handshake_request(self, request):
        # 处理客户端握手请求
        pass
    
    def handle_identity_proof(self, request):
        # 处理客户端身份证明
        pass
    
    def handle_scope_request(self, request):
        # 处理权限请求
        pass
    
    def handle_key_negotiation(self, request):
        # 处理密钥协商
        pass
    
    def validate_access_token(self, token):
        # 验证访问令牌有效性
        pass

握手流程实现示例

# 初始化服务端
identity_manager = IdentityManager()
identity_manager.load_identity("server_identity.json")
auth_confirmation = AuthorizationConfirmation()
permission_manager = PermissionManager()
handshake_service = HandshakeService(
    identity_manager, 
    auth_confirmation, 
    permission_manager
)
# 处理握手请求
@app.route('/ath/handshake', methods=['POST'])
def handshake_endpoint():
    request_data = request.get_json()
    response = handshake_service.handle_handshake_request(request_data)
    return jsonify(response)
# 处理业务请求
@app.route('/api/<path:path>', methods=['GET', 'POST'])
def api_endpoint(path):
    token = request.headers.get('Authorization')
    if not handshake_service.validate_access_token(token):
        return jsonify({"error": "Invalid token"}), 401
    # 处理业务请求
    pass

安全最佳实践

  1. 服务端私钥必须离线存储,不得暴露在公网环境
  2. 用户授权确认必须使用多因素认证(MFA)
  3. 所有握手请求必须进行速率限制,防止暴力攻击
  4. 定期审计授权日志,发现异常行为及时处理