解析SAMLResponse的java工具类

可以使用OpenSAML框架来解析SAMLResponse。以下是一个简单的Java代码示例：

import org.opensaml.core.xml.XMLObject;
import org.opensaml.core.xml.config.XMLObjectProviderRegistrySupport;
import org.opensaml.saml.saml2.core.Response;
import org.opensaml.xmlsec.signature.support.SignatureException;
import org.opensaml.xmlsec.signature.support.SignatureValidator;
import org.opensaml.xmlsec.signature.support.SignatureValidationParameters;
import org.opensaml.xmlsec.signature.support.impl.ExplicitKeySignatureTrustEngine;
import org.opensaml.xmlsec.signature.support.impl.ValidationContext;
import org.opensaml.xmlsec.signature.support.impl.provider.BasicSignatureValidationParametersResolver;
import org.w3c.dom.Element;

import javax.xml.namespace.QName;

public class SAMLResponseParser {

    public Response parseSAMLResponse(String samlResponse, String idpPublicKey) throws Exception {
        Element responseElement = SamlUtil.decodeSAMLResponse(samlResponse);
        Response samlResponseObj = (Response) XMLObjectProviderRegistrySupport.getUnmarshallerFactory()
                .getUnmarshaller(responseElement).unmarshall(responseElement);

        // Validate the signature of the SAML response
        ExplicitKeySignatureTrustEngine trustEngine = new ExplicitKeySignatureTrustEngine(
                new BasicSignatureValidationParametersResolver());
        SignatureValidationParameters validationParameters = new SignatureValidationParameters();
        validationParameters.setPublicKey(SamlUtil.readPublicKey(idpPublicKey));
        ValidationContext validationContext = new ValidationContext(validationParameters);
        SignatureValidator validator = new SignatureValidator(trustEngine);
        try {
            validator.validate(samlResponseObj.getSignature(), validationContext);
        } catch (SignatureException e) {
            throw new Exception("Invalid signature on SAMLResponse", e);
        }

        return samlResponseObj;
    }
    
    // Other helper methods as needed
}

此代码使用OpenSAML解析SAMLResponse并验证其签名。您需要提供SAMLResponse字符串和IDP公钥作为输入参数。请注意，此示例仅提供了一种实现方式，并不是唯一的实现方式。