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34 package info.magnolia.cms.filters;
35
36 import info.magnolia.cms.util.CustomServletConfig;
37 import info.magnolia.objectfactory.Classes;
38
39 import java.io.IOException;
40 import java.util.Map;
41 import java.util.regex.Matcher;
42
43 import javax.inject.Inject;
44 import javax.servlet.FilterChain;
45 import javax.servlet.FilterConfig;
46 import javax.servlet.Servlet;
47 import javax.servlet.ServletException;
48 import javax.servlet.http.HttpServletRequest;
49 import javax.servlet.http.HttpServletRequestWrapper;
50 import javax.servlet.http.HttpServletResponse;
51
52 import info.magnolia.objectfactory.ComponentProvider;
53 import org.apache.commons.lang.StringUtils;
54 import org.slf4j.Logger;
55 import org.slf4j.LoggerFactory;
56
57
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64
65
66 public class ServletDispatchingFilter extends AbstractMgnlFilter {
67
68 static final Logger log = LoggerFactory.getLogger(ServletDispatchingFilter.class);
69
70 private final ComponentProvider componentProvider;
71
72 private String servletName;
73
74 private String servletClass;
75
76 private Map parameters;
77
78 private String comment;
79
80 private Servlet servlet;
81
82 @Inject
83 public ServletDispatchingFilter(ComponentProvider componentProvider) {
84 this.componentProvider = componentProvider;
85 }
86
87 @Override
88 public String getName() {
89 return "Wrapper for " + servletName + " servlet";
90 }
91
92
93
94
95 @Override
96 public void init(final FilterConfig filterConfig) throws ServletException {
97 super.init(filterConfig);
98
99 if (servletClass != null) {
100 try {
101 servlet = componentProvider.newInstance(Classes.getClassFactory().<Servlet>forName(servletClass));
102 servlet.init(new CustomServletConfig(servletName, filterConfig.getServletContext(), parameters));
103 }
104 catch (Throwable e) {
105 log.error("Unable to load servlet " + servletClass + " : " + e.getMessage(), e);
106 }
107 }
108 }
109
110
111
112
113 @Override
114 public void destroy() {
115 if (servlet != null) {
116 servlet.destroy();
117 }
118 super.destroy();
119 }
120
121
122
123
124
125 @Override
126 public void doFilter(final HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
127 log.debug("Dispatching to servlet {}", getServletClass());
128 final Matcher matcher = getMapping().match(request).getMatcher();
129 servlet.service(new WrappedRequest(request, matcher), response);
130 }
131
132 public String getServletName() {
133 return servletName;
134 }
135
136 public void setServletName(String servletName) {
137 this.servletName = servletName;
138 }
139
140 public String getServletClass() {
141 return servletClass;
142 }
143
144 public void setServletClass(String servletClass) {
145 this.servletClass = servletClass;
146 }
147
148 public Map getParameters() {
149 return parameters;
150 }
151
152 public void setParameters(Map parameters) {
153 this.parameters = parameters;
154 }
155
156 public String getComment() {
157 return comment;
158 }
159
160 public void setComment(String comment) {
161 this.comment = comment;
162 }
163
164
165
166
167
168
169 private static class WrappedRequest extends HttpServletRequestWrapper {
170
171 private String originalRequestUri;
172 private String originalServletPath;
173 private String originalPathInfo;
174 private String originalQueryString;
175
176 private String newServletPath;
177 private String newPathInfo;
178
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181
182
183 public WrappedRequest(HttpServletRequest request, Matcher matcher) {
184 super(request);
185
186 this.originalRequestUri = request.getRequestURI();
187 this.originalServletPath = request.getServletPath();
188 this.originalPathInfo = request.getPathInfo();
189 this.originalQueryString = request.getQueryString();
190
191 this.newServletPath = matcher.group(1);
192 if (matcher.groupCount() > 2) {
193 String pathInfo = matcher.group(3);
194
195 if (!pathInfo.equals("")) {
196
197 this.newPathInfo = (pathInfo.startsWith("/") ? pathInfo : "/" + pathInfo);
198 }
199 }
200 }
201
202 @Override
203 public String getPathInfo() {
204 String current = super.getPathInfo();
205 if (!StringUtils.equals(super.getRequestURI(), originalRequestUri)) {
206 return current;
207 }
208 if (!StringUtils.equals(super.getServletPath(), originalServletPath)) {
209 return current;
210 }
211 if (!StringUtils.equals(current, originalPathInfo)) {
212 return current;
213 }
214 if (!StringUtils.equals(super.getQueryString(), originalQueryString)) {
215 return current;
216 }
217 return newPathInfo;
218 }
219
220 @Override
221 public String getServletPath() {
222 String current = super.getServletPath();
223 if (!StringUtils.equals(super.getRequestURI(), originalRequestUri)) {
224 return current;
225 }
226 if (!StringUtils.equals(current, originalServletPath)) {
227 return current;
228 }
229 if (!StringUtils.equals(super.getPathInfo(), originalPathInfo)) {
230 return current;
231 }
232 if (!StringUtils.equals(super.getQueryString(), originalQueryString)) {
233 return current;
234 }
235 return newServletPath;
236 }
237 }
238 }