com.predic8.membrane.core.interceptor.schemavalidation.SOAPMessageValidatorInterceptor.java Source code

Introduction

Here is the source code for com.predic8.membrane.core.interceptor.schemavalidation.SOAPMessageValidatorInterceptor.java

Source

/* Copyright 2011 predic8 GmbH, www.predic8.com
    
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
    
   http://www.apache.org/licenses/LICENSE-2.0
    
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License. */

package com.predic8.membrane.core.interceptor.schemavalidation;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import javax.xml.transform.Source;
import javax.xml.transform.sax.SAXSource;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.InputSource;
import org.xml.sax.helpers.XMLReaderFactory;

import com.predic8.membrane.core.Constants;
import com.predic8.membrane.core.exchange.Exchange;
import com.predic8.membrane.core.http.Message;
import com.predic8.membrane.core.interceptor.AbstractInterceptor;
import com.predic8.membrane.core.interceptor.Outcome;
import com.predic8.membrane.core.util.HttpUtil;
import com.predic8.schema.Schema;
import com.predic8.wsdl.WSDLParser;
import com.predic8.wsdl.WSDLParserContext;

public class SOAPMessageValidatorInterceptor extends AbstractInterceptor {

    private static Log log = LogFactory.getLog(SOAPMessageValidatorInterceptor.class.getName());

    private List<Validator> validators;

    private String wsdl;

    public void init() throws Exception {
        validators = getValidators();
    }

    @Override
    public Outcome handleRequest(Exchange exc) throws Exception {
        return validateMessage(exc, exc.getRequest());
    }

    @Override
    public Outcome handleResponse(Exchange exc) throws Exception {
        return validateMessage(exc, exc.getResponse());
    }

    private Outcome validateMessage(Exchange exc, Message msg) throws Exception {
        List<Exception> exceptions = new ArrayList<Exception>();
        for (Validator validator : validators) {
            validator.validate(getSOAPBody(msg.getBodyAsStream()));
            SchemaValidatorErrorHandler handler = (SchemaValidatorErrorHandler) validator.getErrorHandler();
            // the message must be valid for one schema embedded into WSDL 
            if (handler.noErrors()) {
                return Outcome.CONTINUE;
            }
            exceptions.add(handler.getException());
            handler.reset();
        }
        exc.setResponse(HttpUtil.createSOAPFaultResponse(getErrorMsg(exceptions)));
        return Outcome.ABORT;
    }

    private String getErrorMsg(List<Exception> excs) {
        StringBuffer buf = new StringBuffer();
        buf.append("Validation failed: ");
        for (Exception e : excs) {
            buf.append(e);
            buf.append("; ");
        }
        return buf.toString();
    }

    private List<Validator> getValidators() throws Exception {
        log.info("Get validators for WSDL: " + wsdl);
        WSDLParserContext ctx = new WSDLParserContext();
        ctx.setInput(wsdl);
        SchemaFactory sf = SchemaFactory.newInstance(Constants.XSD_NS);
        sf.setResourceResolver(new SOAModelResourceResolver(wsdl));
        List<Validator> validators = new ArrayList<Validator>();
        for (Schema schema : getEmbeddedSchemas(ctx)) {
            log.info("Adding embedded schema: " + schema);
            Validator validator = sf
                    .newSchema(new StreamSource(new ByteArrayInputStream(schema.getAsString().getBytes())))
                    .newValidator();
            validator.setErrorHandler(new SchemaValidatorErrorHandler());
            validators.add(validator);
        }
        return validators;
    }

    private List<Schema> getEmbeddedSchemas(WSDLParserContext ctx) {
        return new WSDLParser().parse(ctx).getTypes().getSchemas();
    }

    private static Source getSOAPBody(InputStream stream) throws Exception {
        return new SAXSource(new SOAPXMLFilter(XMLReaderFactory.createXMLReader()), new InputSource(stream));
    }

    public void setWsdl(String wsdl) {
        this.wsdl = wsdl;
    }

    public String getWsdl() {
        return wsdl;
    }
}