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package org.onap.ccsdk.apps.filters;
import java.io.IOException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class ContentTypeFilter implements Filter {
String DEFAULT_CONTENT_TYPE = "application/json";
@Override
public void doFilter(ServletRequest httpReq, ServletResponse httpResp, FilterChain chain)
throws IOException, ServletException {
String defaultContentType = System.getProperty("ccsdk.defaults.content-type", DEFAULT_CONTENT_TYPE);
chain.doFilter(new DefaultContentTypeHttpRequest((HttpServletRequest) httpReq, defaultContentType), httpResp);
}
private class DefaultContentTypeHttpRequest extends HttpServletRequestWrapper {
HttpServletRequest httpRequest;
String contentType;
List<String> acceptList;
List<String> headerNames;
public DefaultContentTypeHttpRequest(HttpServletRequest httpRequest, String defaultContentType) {
super(httpRequest);
this.httpRequest = httpRequest;
this.contentType = defaultContentType;
this.acceptList = null;
boolean hasContentType = false;
headerNames = new LinkedList<String>();
Enumeration<String> headerNameEnum = httpRequest.getHeaderNames();
while (headerNameEnum.hasMoreElements()) {
String curHeaderName = headerNameEnum.nextElement();
if ("Content-Type".equalsIgnoreCase(curHeaderName)) {
hasContentType = true;
contentType = super.getContentType();
if ("application/yang-data+json".equalsIgnoreCase(contentType)) {
contentType = "application/json";
} else if ("application/yang-data+xml".equalsIgnoreCase(contentType)) {
contentType = "application/xml";
} else if (contentType.startsWith("text/plain") || contentType.startsWith("*/*")) {
// Use Accept header, if present, to determine content type.
boolean acceptsXml = false;
boolean acceptsJson = false;
for (Enumeration<String> e = getHeaders("Accept") ; e.hasMoreElements() ;) {
String curAcceptValue = e.nextElement();
if ("application/json".equalsIgnoreCase(curAcceptValue)) {
acceptsJson = true;
} else if ("application/yang-data+json".equalsIgnoreCase(curAcceptValue)) {
acceptsJson = true;
} else if ("application/xml".equalsIgnoreCase(curAcceptValue)) {
acceptsXml = true;
} else if ("application/yang-data+xml".equalsIgnoreCase(curAcceptValue)) {
acceptsXml = true;
}
}
if (acceptsJson) {
contentType = "application/json";
} else if (acceptsXml) {
contentType = "application/xml";
} else {
// If Accept does not specify XML or JSON (could be Accept is missing), use default content type
contentType = defaultContentType;
}
}
} else if ("Accept".equalsIgnoreCase(curHeaderName)) {
acceptList = new LinkedList<String>();
for (Enumeration<String> e = getHeaders("Accept") ; e.hasMoreElements() ;) {
String acceptValue = e.nextElement();
if ("application/yang-data+json".equalsIgnoreCase(acceptValue)) {
if (!acceptList.contains("application/json")) {
acceptList.add("application/json");
}
} else if ("application/yang-data+xml".equalsIgnoreCase(acceptValue)) {
if (!acceptList.contains("application/xml")) {
acceptList.add("application/xml");
}
} else {
if (!acceptList.contains(acceptValue)) {
acceptList.add(acceptValue);
}
}
}
}
headerNames.add(curHeaderName);
}
if (!hasContentType) {
headerNames.add("Content-Type");
}
}
@Override
public String getHeader(String name) {
if (name.equalsIgnoreCase("Content-Type")) {
return getContentType();
} else {
return super.getHeader(name);
}
}
@Override
public Enumeration<String> getHeaders(String name) {
if ("Accept".equalsIgnoreCase(name) && (acceptList != null)) {
return Collections.enumeration(acceptList);
} else {
return super.getHeaders(name);
}
}
@Override
public Enumeration<String> getHeaderNames() {
return(Collections.enumeration(headerNames));
}
@Override
public String getContentType() {
return contentType;
}
}
}
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