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1
24 package org.riotfamily.common.web.filter;
25
26 import java.io.IOException  ;
27 import java.util.Arrays ;
28
29 import javax.servlet.FilterChain ;
30 import javax.servlet.ServletContext ;
31 import javax.servlet.ServletException ;
32 import javax.servlet.http.HttpServletRequest ;
33 import javax.servlet.http.HttpServletResponse ;
34
35 import org.springframework.core.OrderComparator;
36 import org.springframework.util.AntPathMatcher;
37 import org.springframework.web.filter.OncePerRequestFilter;
38 import org.springframework.web.util.UrlPathHelper;
39
40
55 public final class PluginFilter extends OncePerRequestFilter {
56
57 private static final String ATTRIBUTE_PREFIX =
58 PluginFilter.class.getName() + '.';
59
60 private String [] exclude;
61
62 private UrlPathHelper urlPathHelper = new UrlPathHelper();
63
64 private AntPathMatcher pathMatcher = new AntPathMatcher();
65
66 private OrderComparator orderComparator = new OrderComparator();
67
68 private FilterPlugin[] plugins = new FilterPlugin[0];
69
70
73 public void setExclude(String [] exclude) {
74 this.exclude = exclude;
75 }
76
77 protected void initFilterBean() throws ServletException {
78 getServletContext().setAttribute(
79 ATTRIBUTE_PREFIX + getFilterName(), this);
80 }
81
82 synchronized void addPlugin(FilterPlugin plugin) {
83 int n = plugins.length;
84 FilterPlugin[] newPlugins = new FilterPlugin[n + 1];
85 System.arraycopy(plugins, 0, newPlugins, 0, n);
86 newPlugins[n++] = plugin;
87 Arrays.sort(newPlugins, orderComparator);
88 plugins = newPlugins;
89 }
90
91 synchronized void removePlugin(FilterPlugin plugin) {
92 int n = plugins.length;
93 FilterPlugin[] newPlugins = new FilterPlugin[n - 1];
94 int j = 0;
95 for (int i = 0; i < n; i++) {
96 if (plugins[i] != plugin) {
97 newPlugins[j++] = plugins[i];
98 }
99 }
100 plugins = newPlugins;
101 }
102
103
107 protected boolean shouldNotFilter(HttpServletRequest request) {
108 if (exclude != null) {
109 String path = urlPathHelper.getPathWithinApplication(request);
110 for (int i = 0; i < exclude.length; i++) {
111 if (pathMatcher.match(exclude[i], path)) {
112 return true;
113 }
114 }
115 }
116 return false;
117 }
118
119 protected void doFilterInternal(HttpServletRequest request,
120 HttpServletResponse response, FilterChain filterChain)
121 throws ServletException , IOException {
122
123 new PluginChain(filterChain, plugins).doFilter(request, response);
124 }
125
126 static PluginFilter getInstance(ServletContext servletContext,
127 String filterName) {
128
129 return (PluginFilter) servletContext.getAttribute(
130 ATTRIBUTE_PREFIX + filterName);
131 }
132
133 }
134 |
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