001
014
015 package com.liferay.portal.servlet.filters.header;
016
017 import com.liferay.portal.kernel.servlet.HttpHeaders;
018 import com.liferay.portal.kernel.util.ArrayUtil;
019 import com.liferay.portal.kernel.util.FastDateFormatFactoryUtil;
020 import com.liferay.portal.kernel.util.GetterUtil;
021 import com.liferay.portal.kernel.util.HttpUtil;
022 import com.liferay.portal.kernel.util.LocaleUtil;
023 import com.liferay.portal.kernel.util.SetUtil;
024 import com.liferay.portal.kernel.util.StringUtil;
025 import com.liferay.portal.kernel.util.TimeZoneUtil;
026 import com.liferay.portal.kernel.util.Validator;
027 import com.liferay.portal.servlet.filters.BasePortalFilter;
028 import com.liferay.portal.util.PortalUtil;
029 import com.liferay.portal.util.PropsValues;
030
031 import java.text.Format;
032
033 import java.util.Calendar;
034 import java.util.Enumeration;
035 import java.util.GregorianCalendar;
036 import java.util.Map;
037 import java.util.Set;
038
039 import javax.servlet.FilterChain;
040 import javax.servlet.FilterConfig;
041 import javax.servlet.http.HttpServletRequest;
042 import javax.servlet.http.HttpServletResponse;
043 import javax.servlet.http.HttpSession;
044
045
050 public class HeaderFilter extends BasePortalFilter {
051
052 @Override
053 public void init(FilterConfig filterConfig) {
054 super.init(filterConfig);
055
056 _filterConfig = filterConfig;
057 _dateFormat = FastDateFormatFactoryUtil.getSimpleDateFormat(
058 _DATE_FORMAT, LocaleUtil.US, TimeZoneUtil.GMT);
059 }
060
061 protected long getLastModified(HttpServletRequest request) {
062 long lasModified = -1;
063
064 Map<String, String[]> parameterMap = HttpUtil.getParameterMap(
065 request.getQueryString());
066
067 String[] value = parameterMap.get("t");
068
069 if (ArrayUtil.isNotEmpty(value)) {
070 lasModified = GetterUtil.getLong(value[0]);
071 }
072
073 return lasModified;
074 }
075
076 @Override
077 protected void processFilter(
078 HttpServletRequest request, HttpServletResponse response,
079 FilterChain filterChain)
080 throws Exception {
081
082 Enumeration<String> enu = _filterConfig.getInitParameterNames();
083
084 while (enu.hasMoreElements()) {
085 String name = enu.nextElement();
086
087 if (_requestHeaderIgnoreInitParams.contains(name)) {
088 continue;
089 }
090
091 String value = _filterConfig.getInitParameter(name);
092
093 if (name.equals(_EXPIRES) && Validator.isNumber(value)) {
094 int seconds = GetterUtil.getInteger(value);
095
096 Calendar cal = new GregorianCalendar();
097
098 cal.add(Calendar.SECOND, seconds);
099
100 value = _dateFormat.format(cal.getTime());
101 }
102
103
104
105 boolean addHeader = true;
106
107 if (StringUtil.equalsIgnoreCase(name, HttpHeaders.CACHE_CONTROL) ||
108 StringUtil.equalsIgnoreCase(name, HttpHeaders.EXPIRES)) {
109
110 boolean newSession = false;
111
112 HttpSession session = request.getSession(false);
113
114 if ((session == null) || session.isNew()) {
115 newSession = true;
116 }
117
118 String contextPath = request.getContextPath();
119
120 if (StringUtil.equalsIgnoreCase(name, HttpHeaders.EXPIRES) &&
121 newSession) {
122
123 addHeader = false;
124 }
125 else if (PropsValues.WEB_SERVER_PROXY_LEGACY_MODE &&
126 newSession &&
127 contextPath.equals(PortalUtil.getPathContext())) {
128
129 addHeader = false;
130 }
131 }
132
133 if (addHeader) {
134 response.addHeader(name, value);
135 }
136 }
137
138 long lastModified = getLastModified(request);
139 long ifModifiedSince = request.getDateHeader(
140 HttpHeaders.IF_MODIFIED_SINCE);
141
142 if (lastModified > 0) {
143 response.setDateHeader(HttpHeaders.LAST_MODIFIED, lastModified);
144
145 if (lastModified <= ifModifiedSince) {
146 response.setDateHeader(
147 HttpHeaders.LAST_MODIFIED, ifModifiedSince);
148 response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
149
150 return;
151 }
152 }
153
154 processFilter(HeaderFilter.class, request, response, filterChain);
155 }
156
157 private static final String _DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss z";
158
159 private static final String _EXPIRES = "Expires";
160
161 private static Set<String> _requestHeaderIgnoreInitParams =
162 SetUtil.fromArray(PropsValues.REQUEST_HEADER_IGNORE_INIT_PARAMS);
163
164 private Format _dateFormat;
165 private FilterConfig _filterConfig;
166
167 }