Appengine - Deployment of hidden folder

[Will Calderwood via StackOverflow]

I ran into this problem trying to server an assetlinks.json file. It would indeed appear that folders starting with a . are not accessible within the static context in App Engine. A more generic version of João Antunes workaround is as follows.

First, create the folder without the . at the start.

We then need to create a servlet that will respond with the correct data when a request to the hidden folder is received.

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;

/**
 * Created by Will Calderwood on 17/05/2017.
 * <p>
 * It would appear to not be possible to upload hidden folders to app engine. So when files need
 * to be served from a hidden folder the URL can be bounced through this servlet
 */
public class StaticFileServer extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // We'll remove the dots from the path
        String uri = req.getRequestURI().replace("/.", "/");

        // Do anything else you need to do here
        if (uri.contains(".json")) {
            resp.setContentType("application/json");
        }

        // Read and return the resource from the non-hidden folder
        try (InputStream in = getServletContext().getResourceAsStream(uri)) {
            byte[] buffer = new byte[1024];
            int count;
            while ((count = in.read(buffer)) > 0) {
                resp.getOutputStream().write(buffer, 0, count);
            }
        }
    }
}

Then add the following to your web.xml file to point the hidden folder to our servlet

<servlet>
    <servlet-name>StaticFileServer</servlet-name>
    <servlet-class>main.com.you.StaticFileServer</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>StaticFileServer</servlet-name>
    <url-pattern>/.well-known/*</url-pattern>
</servlet-mapping>

Please DO NOT REPLY directly to this email but go to StackOverflow:
http://stackoverflow.com/questions/39281654/appengine-deployment-of-hidden-folder/44023751#44023751

[Will Calderwood via StackOverflow]

I ran into this problem trying to serve an assetlinks.json file. It would indeed appear that folders starting with a . are not accessible within the static context in App Engine. A more generic version of João Antunes workaround is as follows.

First, create the folder without the . at the start and place any required files inside it.

We then need to create a servlet that will respond with the correct data when a request to the hidden folder is received.

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;

/**
 * Created by Will Calderwood on 17/05/2017.
 * <p>
 * It would appear to not be possible to upload hidden folders to app engine. So when files need
 * to be served from a hidden folder the URL can be bounced through this servlet
 */
public class StaticFileServer extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // We'll remove the dots from the path
        String uri = req.getRequestURI().replace("/.", "/");

        // Do anything else you need to do here
        if (uri.contains(".json")) {
            resp.setContentType("application/json");
        }

        // Read and return the resource from the non-hidden folder
        try (InputStream in = getServletContext().getResourceAsStream(uri)) {
            byte[] buffer = new byte[8192];
            int count;
            while ((count = in.read(buffer)) > 0) {
                resp.getOutputStream().write(buffer, 0, count);
            }
        }
    }
}

Then add the following to your web.xml file to point the hidden folder at our servlet

[Will Calderwood via StackOverflow]

I ran into this problem trying to serve an assetlinks.json file. It would indeed appear that folders starting with a . are not accessible within the static context in App Engine. A more generic version of João Antunes workaround is as follows.

First, create the folder without the . at the start and place any required files inside it.

We then need to create a servlet that will respond with the correct data when a request to the hidden folder is received.

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;

/**
 * Created by Will Calderwood on 17/05/2017.
 * <p>
 * It would appear to not be possible to upload hidden folders to app engine. So when files need
 * to be served from a hidden folder the URL can be bounced through this servlet
 */
public class StaticFileServer extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // We'll remove the dots from the path
        String uri = req.getRequestURI().replace("/.", "/");

        if (uri.contains(".json")) {
            resp.setContentType("application/json");
        }

        // Read and return the resource from the non-hidden folder
        try (InputStream in = getServletContext().getResourceAsStream(uri)) {
            if (in == null){
                resp.sendError(404);
                return;
            }
            byte[] buffer = new byte[8192];
            int count;
            while ((count = in.read(buffer)) > 0) {
                resp.getOutputStream().write(buffer, 0, count);
            }
        }
    }
}