dgageot/SEOFilter.java

## SEOFilter.java
package main;

import com.google.common.base.Strings;
import com.google.common.io.ByteStreams;
import com.sun.jersey.spi.container.ContainerRequest;
import com.sun.jersey.spi.container.ContainerResponse;
import com.sun.jersey.spi.container.ContainerResponseFilter;

import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;

import java.io.File;

public class SEOFilter implements ContainerResponseFilter {
  @Override
  public ContainerResponse filter(ContainerRequest request, ContainerResponse response) {
    String method = request.getMethod();
    if (!method.equals("GET")) {
      return response;
    }

    String userAgent = Strings.nullToEmpty(request.getRequestHeaders().getFirst("User-agent"));
    //if (!userAgent.contains("Chrome")) {
    if (!userAgent.contains("Googlebot")) {
      return response;
    }

    String uri = request.getAbsolutePath().toString();
    if (uri.endsWith(".jpg") || uri.endsWith(".gif") || uri.endsWith(".png")) {
      return response;
    }
    if (uri.endsWith(".css") || uri.endsWith(".js") || uri.endsWith(".map")) {
      return response;
    }

    System.out.println("Google is in the house! " + uri);

    try {
      Process process = new ProcessBuilder("phantomjs", "download.js", uri)
        .directory(new File("."))
        .redirectErrorStream(true)
        .start();
      process.waitFor();

      byte[] body = ByteStreams.toByteArray(process.getInputStream());
      String page = "<!DOCTYPE html>" + new String(body);

      response.setResponse(Response
        .fromResponse(response.getResponse())
        .type(MediaType.TEXT_HTML_TYPE)
        .entity(page)
        .build());
    } catch (Exception e) {
      e.printStackTrace();
    }

    return response;
  }
}
	package main;

	import com.google.common.base.Strings;
	import com.google.common.io.ByteStreams;
	import com.sun.jersey.spi.container.ContainerRequest;
	import com.sun.jersey.spi.container.ContainerResponse;
	import com.sun.jersey.spi.container.ContainerResponseFilter;

	import javax.ws.rs.core.MediaType;
	import javax.ws.rs.core.Response;

	import java.io.File;

	public class SEOFilter implements ContainerResponseFilter {
	@Override
	public ContainerResponse filter(ContainerRequest request, ContainerResponse response) {
	String method = request.getMethod();
	if (!method.equals("GET")) {
	return response;
	}

	String userAgent = Strings.nullToEmpty(request.getRequestHeaders().getFirst("User-agent"));
	//if (!userAgent.contains("Chrome")) {
	if (!userAgent.contains("Googlebot")) {
	return response;
	}

	String uri = request.getAbsolutePath().toString();
	if (uri.endsWith(".jpg") \|\| uri.endsWith(".gif") \|\| uri.endsWith(".png")) {
	return response;
	}
	if (uri.endsWith(".css") \|\| uri.endsWith(".js") \|\| uri.endsWith(".map")) {
	return response;
	}

	System.out.println("Google is in the house! " + uri);

	try {
	Process process = new ProcessBuilder("phantomjs", "download.js", uri)
	.directory(new File("."))
	.redirectErrorStream(true)
	.start();
	process.waitFor();

	byte[] body = ByteStreams.toByteArray(process.getInputStream());
	String page = "<!DOCTYPE html>" + new String(body);

	response.setResponse(Response
	.fromResponse(response.getResponse())
	.type(MediaType.TEXT_HTML_TYPE)
	.entity(page)
	.build());
	} catch (Exception e) {
	e.printStackTrace();
	}

	return response;
	}
	}