Appengine - Deployment of hidden folder

Question

To verify a SSL certificate, I need to upload a hidden folder ("/.well-known" containing some files to my application.

I am deploying java application with eclipse, but these files do not receive at the application on appengine. I guess they are filtered out.

I tried to add the hidden folder as static file to the appengine-web.xml, but it did not help.

<!-- Configure serving/caching of GWT files -->
<static-files>
    <include path="**" />
    <include path=".**" />
    <include path="**.*" expiration="0s" />
    <include path="**.well-known" expiration="0s" />
    <include path="**.nocache.*" expiration="0s" />
    <include path="**.cache.*" expiration="365d" />
    <include path="**.css" expiration="30d"/>
    <exclude path="**.gwt.rpc" />
    <exclude path="**.html" />
</static-files>

Any ideas how I could upload these folder and the files?

Answer 1

For anyone else coming here like me after trying to serve the challenge for letsencrypt in a static manner in Google App Engine and failing, the following did it for me: (one might be able to actually do it statically, but I didn't try it as I didn't want to spend more time trying out stuff and Ian apparently tried that and could not make it work [maybe the copy command done internally on Google App Engine ignores the directories that start with a dot] )

Taken from http://igorartamonov.com/2015/12/lets-encrypt-ssl-google-appengine/ credits go to Igor Artamonov.

Just build a servlet like:

public class LetsencryptServlet extends HttpServlet {

    public static final Map<String, String> challenges = new HashMap<String, String>();

    static {
        challenges.put("RzrvZ9gd7EH3i_TsJM-B0vdEMslD4oo_lwsagGskp6c",
                "RzrvZ9gd7EH3i_TsJM-B0vdEMslD4oo_lwsagGskp6c.ONrZa3UelibSWEX270nTUiRZKPFXw096nENWbMGw0-E");
    }

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws ServletException, IOException {
        if (!req.getRequestURI().startsWith("/.well-known/acme-challenge/")) {
            resp.sendError(404);
            return;
        }
        String id = req.getRequestURI().substring("/.well-known/acme-challenge/".length());
        if (!challenges.containsKey(id)) {
            resp.sendError(404);
            return;
        }
        resp.setContentType("text/plain");
        resp.getOutputStream().print(challenges.get(id));
    }
}

And add to web.xml somethine like:

<servlet>
    <servlet-name>letsencrypt</servlet-name>
    <servlet-class>...LetsencryptServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>letsencrypt</servlet-name>
    <url-pattern>/.well-known/acme-challenge/*</url-pattern>
</servlet-mapping>

Of course, be sure that the servlet class has the full classpath for your created Servlet.

That blog post also deals with the other steps necessary to generate and install the certificate.

Ian: Are you sure that you were deploying the servlet well? check the logs, make sure that you are testing the right version.. maybe you had a compilation issue..

Cheers