Neo4j Server Extension that serves files from a webapp directory of the JAR

StaticWebResource.java

@Path("/")
public class StaticWebResource {

    @GET
    @Path("{file:(?i).+\\.(png|jpg|jpeg|svg|gif|html?|js|css|txt)}")
    public Response file(@PathParam("file") String file) throws IOException {
        InputStream fileStream = findFileStream(file);
        if (fileStream == null) return Response.status(Response.Status.NOT_FOUND).build();
        else return Response.ok(fileStream, mediaType(file)).build();
    }

    private InputStream findFileStream(String file) throws IOException {
        URL fileUrl = ClassLoader.getSystemResource("webapp/" + file);
        if (fileUrl==null) return null;
        return fileUrl.openStream();
    }

    public String mediaType(String file) {
        int dot = file.lastIndexOf(".");
        if (dot == -1) return MediaType.TEXT_PLAIN;
        String ext = file.substring(dot + 1).toLowerCase();
        switch (ext) {
            case "png":
                return "image/png";
            case "js":
                return "text/javascript";
            case "css":
                return "text/css";
            case "html":
                return MediaType.TEXT_HTML;
            default:
                return MediaType.TEXT_PLAIN;
        }
    }
}