001// Copyright 2008, 2010, 2011, 2012 The Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007// http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.SymbolConstants;
018import org.apache.tapestry5.ioc.annotations.Inject;
019import org.apache.tapestry5.ioc.annotations.Symbol;
020import org.apache.tapestry5.ioc.internal.util.InternalUtils;
021import org.apache.tapestry5.services.BaseURLSource;
022import org.apache.tapestry5.services.Request;
023
024public class BaseURLSourceImpl implements BaseURLSource
025{
026    private final Request request;
027
028    private String hostname;
029    private int hostPort;
030    private int secureHostPort;
031
032    public BaseURLSourceImpl(Request request, @Inject @Symbol(SymbolConstants.HOSTNAME) String hostname,
033                             @Symbol(SymbolConstants.HOSTPORT) int hostPort, @Symbol(SymbolConstants.HOSTPORT_SECURE) int secureHostPort)
034    {
035        this.request = request;
036        this.hostname = hostname;
037        this.hostPort = hostPort;
038        this.secureHostPort = secureHostPort;
039    }
040
041    public String getBaseURL(boolean secure)
042    {
043        return String.format("%s://%s%s",
044                secure ? "https" : "http",
045                hostname(),
046                portExtension(secure));
047    }
048
049    private String portExtension(boolean secure)
050    {
051        int port = secure ? secureHostPort : hostPort;
052
053        // The default for the ports is 0, which means to use Request.serverPort. That's mostly
054        // for development.
055        if (port <= 0)
056        {
057            port = request.getServerPort();
058        }
059
060        int expectedPort = secure ? 443 : 80;
061
062        if (port == expectedPort)
063        {
064            return "";
065        }
066
067        return ":" + port;
068    }
069
070    private String hostname()
071    {
072
073        if (InternalUtils.isBlank(hostname))
074        {
075            return request.getServerName();
076        }
077
078        // This is common in some PaaS deployments, such as Heroku, where the port is passed in as
079        // and environment variable.
080
081        if (this.hostname.startsWith("$"))
082        {
083            return System.getenv(hostname.substring(1));
084        }
085
086        return hostname;
087    }
088}