resources - provided extension point on ResourcesRoute constructor al…

…lowing to override behaviour forbidding usage of / baseResourcePath, in case someone would like to

serve resources from root classpath, even if this is not advised from a security standpoint

restx-core/src/main/java/restx/ResourcesRoute.java

@@ -91,15 +91,24 @@ public ResourcesRoute(String name, String baseRestPath, String baseResourcePath,
    public ResourcesRoute(String name, String baseRestPath, String baseResourcePath, ImmutableMap<String, String> aliases, List<CachedResourcePolicy> cachedResourcePolicies) {
        this.name = checkNotNull(name);
        this.baseRestPath = ("/" + checkNotNull(baseRestPath) + "/").replaceAll("/+", "/");
        this.baseResourcePath = checkNotNull(baseResourcePath)
                .replace('.', '/').replaceAll("^/", "").replaceAll("/$", "") + "/";
        if("/".equals(this.baseResourcePath)){
            throw new IllegalArgumentException("Please, avoid using '/' as ResourcesRoute's baseResourcePath as it represents serious security flaws (people will be able to read your classpath configuration files)");
        }
        this.baseResourcePath = this.ensureBaseResourcePathValid(baseResourcePath);
        this.aliases = checkNotNull(aliases);
        this.cachedResourcePolicies = ImmutableList.copyOf(cachedResourcePolicies);
    }

    protected String ensureBaseResourcePathValid(String baseResourcePath) {
        String escapedBaseResourcePath = checkNotNull(baseResourcePath)
                .replace('.', '/')
                .replaceAll("^/", "")
                .replaceAll("/$", "") + "/";

        if("/".equals(escapedBaseResourcePath)){
            throw new IllegalArgumentException("Please, avoid using '/' as ResourcesRoute's baseResourcePath as it represents serious security flaws (people will be able to read your classpath configuration files)");
        }

        return escapedBaseResourcePath;
    }

    @Override
    public Optional<RestxHandlerMatch> match(RestxRequest req) {
        if (req.getHttpMethod().equals("GET") && req.getRestxPath().startsWith(baseRestPath)) {