ResourceUriUtil.java

package com.sixsq.slipstream.util;

/*
 * +=================================================================+
 * SlipStream Server (WAR)
 * =====
 * Copyright (C) 2013 SixSq Sarl (sixsq.com)
 * =====
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * -=================================================================-
 */

import org.restlet.Request;
import org.restlet.data.Reference;
import org.restlet.util.Series;

public class ResourceUriUtil {

	public static final String CONFIGURATION_KEY = "com.sixsq.slipstream.CONFIGURATION";

	public static final String SVC_CONFIGURATION_KEY = "com.sixsq.slipstream.SVC_CONFIGURATION";

	public static final String ENTITY_MANAGER_KEY = "ENTITY_MANAGER";

	private ResourceUriUtil() {
	}

    //
    // takes into account the X-Forwarded-Proto and Host headers
    // set by the proxy server (if any)
    //
    public static String getBaseUrlSlash(Request request) {

        Series<?> headers = (Series<?>) request.getAttributes().get("org.restlet.http.headers");

        String scheme = null;
        String authority = null;
        if (headers != null) {
            scheme = headers.getFirstValue("X-Forwarded-Proto", true);
            authority = headers.getFirstValue("Host");
        }

        Reference ref = request.getRootRef();
        if (authority != null) {
            ref.setAuthority(authority);
        }
        if (scheme != null) {
            ref.setScheme(scheme);
        }

        String url = ref.toString();
        return url.endsWith("/") ? url : url + "/";
    }

    public static Reference getBaseRefSlash(Request request) {
		String baseUrlSlash = getBaseUrlSlash(request);
		return new Reference(baseUrlSlash);
	}

	public static String getBaseUrl(Request request) {
		String url = getBaseUrlSlash(request);
		if (url.endsWith("/")) {
			url = url.substring(0, url.length() - 1);
		}
		return url;
	}

	public static Reference getBaseRef(Request request) {
		String baseUrl = getBaseUrl(request);
		return new Reference(baseUrl);
	}

    //
    // does NOT take into account any proxy headers
    //
    public static Reference getLocalBaseRefSlash(Request request) {
        Reference rootRef = request.getRootRef();
        String url = rootRef.toString();
        if (!url.endsWith("/")) {
            url += "/";
        }
        return new Reference(url);
    }

    public static String extractResourceUri(Request request) {
		Reference resourceRef = request.getResourceRef();
		Reference baseRefSlash = getLocalBaseRefSlash(request);
		Reference resourceUrlRef = resourceRef.getRelativeRef(baseRefSlash);
		String uri = resourceUrlRef.getHierarchicalPart();
		return uri.equals(".") ? "module/" : uri;
	}

}