import boto3
import json
import xml.etree.ElementTree as ET
from datetime import datetime, timedelta
import base64
import urllib.parse

def understand_identity_federation():
    """
    理解联合身份的概念和架构
    """
    
    federation_concepts = {
        "identity_federation": {
            "definition": "联合身份允许外部身份提供商的用户访问AWS资源，无需在AWS中创建IAM用户",
            "benefits": [
                "单点登录体验",
                "集中的身份管理",
                "减少密码管理复杂性",
                "支持企业级身份提供商",
                "临时凭证提高安全性"
            ],
            "key_components": [
                "身份提供商 (IdP)",
                "服务提供商 (SP) - AWS",
                "身份断言",
                "信任关系",
                "角色映射"
            ]
        },
        "federation_types": {
            "saml_federation": {
                "description": "基于SAML 2.0协议的企业级联合",
                "use_cases": ["企业Active Directory", "ADFS", "第三方IdP"],
                "workflow": [
                    "用户在企业IdP认证",
                    "IdP生成SAML断言",
                    "用户重定向到AWS SAML端点",
                    "AWS验证断言并提供临时凭证",
                    "用户使用临时凭证访问AWS资源"
                ]
            },
            "oidc_federation": {
                "description": "基于OpenID Connect的Web身份联合",
                "use_cases": ["移动应用", "Web应用", "第三方登录"],
                "workflow": [
                    "用户通过OIDC提供商认证",
                    "获取身份令牌",
                    "使用令牌调用AWS STS",
                    "获取临时AWS凭证",
                    "访问AWS资源"
                ]
            },
            "web_identity_federation": {
                "description": "直接与Web身份提供商集成",
                "use_cases": ["Amazon Cognito", "Google", "Facebook登录"],
                "workflow": [
                    "用户通过Web IdP登录",
                    "获取身份令牌",
                    "直接使用AssumeRoleWithWebIdentity",
                    "获取AWS临时凭证"
                ]
            }
        }
    }
    
    # 联合身份的信任模型
    trust_model = {
        "trust_establishment": {
            "identity_provider_setup": "在AWS中配置身份提供商",
            "trust_policy_creation": "创建信任策略允许IdP代入角色",
            "attribute_mapping": "映射IdP属性到AWS角色",
            "condition_validation": "验证联合条件和约束"
        },
        "security_considerations": [
            "验证SAML断言的完整性和真实性",
            "使用适当的条件限制角色访问",
            "定期轮换加密密钥",
            "监控和审计联合访问",
            "实施最小权限原则"
        ]
    }
    
    print("📋 联合身份概念:")
    print(f"定义: {federation_concepts['identity_federation']['definition']}")
    
    print("\n优势:")
    for benefit in federation_concepts['identity_federation']['benefits']:
        print(f"  • {benefit}")
    
    print("\n关键组件:")
    for component in federation_concepts['identity_federation']['key_components']:
        print(f"  • {component}")
    
    print("\n📋 联合类型:")
    for fed_type, details in federation_concepts['federation_types'].items():
        print(f"\n{fed_type.replace('_', ' ').title()}:")
        print(f"  描述: {details['description']}")
        print(f"  用例: {', '.join(details['use_cases'])}")
    
    return federation_concepts, trust_model

class IdentityFederationManager:
    """联合身份管理器"""
    
    def __init__(self):
        self.iam = boto3.client('iam')
        self.sts = boto3.client('sts')
    
    def create_saml_identity_provider(self, provider_name, metadata_document):
        """创建SAML身份提供商"""
        try:
            response = self.iam.create_saml_provider(
                SAMLMetadataDocument=metadata_document,
                Name=provider_name,
                Tags=[
                    {'Key': 'Type', 'Value': 'SAML'},
                    {'Key': 'Purpose', 'Value': 'Federation'},
                    {'Key': 'CreatedDate', 'Value': datetime.now().strftime('%Y-%m-%d')}
                ]
            )
            
            provider_arn = response['SAMLProviderArn']
            print(f"✅ SAML身份提供商创建成功: {provider_arn}")
            
            return provider_arn
            
        except Exception as e:
            print(f"❌ 创建SAML身份提供商失败: {str(e)}")
            return None
    
    def create_oidc_identity_provider(self, provider_url, client_ids, thumbprints):
        """创建OIDC身份提供商"""
        try:
            response = self.iam.create_open_id_connect_provider(
                Url=provider_url,
                ClientIDList=client_ids,
                ThumbprintList=thumbprints,
                Tags=[
                    {'Key': 'Type', 'Value': 'OIDC'},
                    {'Key': 'Purpose', 'Value': 'WebIdentityFederation'}
                ]
            )
            
            provider_arn = response['OpenIDConnectProviderArn']
            print(f"✅ OIDC身份提供商创建成功: {provider_arn}")
            
            return provider_arn
            
        except Exception as e:
            print(f"❌ 创建OIDC身份提供商失败: {str(e)}")
            return None

# 演示联合身份概念
federation_concepts, trust_model = understand_identity_federation()
federation_manager = IdentityFederationManager()

print("\n📋 信任模型组件:")
for component, description in trust_model['trust_establishment'].items():
    print(f"  {component.replace('_', ' ').title()}: {description}")