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package org.apache.struts.config;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.ActionForward;
import org.apache.struts.config.ActionConfig;
import org.apache.struts.util.WildcardHelper;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
/**
* Matches paths against pre-compiled wildcard expressions pulled from
* action configs. It uses the wildcard matcher from the Apache Cocoon
* project. Patterns will be matched in the order they exist in the Struts
* config file. The last match wins, so more specific patterns should be
* defined after less specific patterns.
*
* @since Struts 1.2
*/
public class ActionConfigMatcher implements Serializable {
/**
*
The logging instance
*/
private static final Log log = LogFactory.getLog(ActionConfigMatcher.class);
/**
* Handles all wildcard pattern matching.
*/
private static final WildcardHelper wildcard = new WildcardHelper();
/**
* The compiled paths and their associated ActionConfig's
*/
private List compiledPaths;
/**
* Finds and precompiles the wildcard patterns from the ActionConfig
* "path" attributes. ActionConfig's will be evaluated in the order they
* exist in the Struts config file. Only paths that actually contain a
* wildcard will be compiled.
*
* @param configs An array of ActionConfig's to process
*/
public ActionConfigMatcher(ActionConfig[] configs) {
compiledPaths = new ArrayList();
int[] pattern;
String path;
for (int x = 0; x < configs.length; x++) {
path = configs[x].getPath();
if ((path != null) && (path.indexOf('*') > -1)) {
if ((path.length() > 0) && (path.charAt(0) == '/')) {
path = path.substring(1);
}
if (log.isDebugEnabled()) {
log.debug("Compiling action config path '" + path + "'");
}
pattern = wildcard.compilePattern(path);
compiledPaths.add(new Mapping(pattern, configs[x]));
}
}
}
/**
* Matches the path against the compiled wildcard patterns.
*
* @param path The portion of the request URI for selecting a config.
* @return The action config if matched, else null
*/
public ActionConfig match(String path) {
ActionConfig config = null;
if (compiledPaths.size() > 0) {
if (log.isDebugEnabled()) {
log.debug("Attempting to match '" + path
+ "' to a wildcard pattern");
}
if ((path.length() > 0) && (path.charAt(0) == '/')) {
path = path.substring(1);
}
Mapping m;
HashMap vars = new HashMap();
for (Iterator i = compiledPaths.iterator(); i.hasNext();) {
m = (Mapping) i.next();
if (wildcard.match(vars, path, m.getPattern())) {
if (log.isDebugEnabled()) {
log.debug("Path matches pattern '"
+ m.getActionConfig().getPath() + "'");
}
try {
config =
convertActionConfig(path,
(ActionConfig) m.getActionConfig(), vars);
} catch (IllegalStateException e) {
log.warn("Path matches pattern '"
+ m.getActionConfig().getPath() + "' but is "
+ "incompatible with the matching config due "
+ "to recursive substitution: "
+ path);
config = null;
}
}
}
}
return config;
}
/**
* Clones the ActionConfig and its children, replacing various
* properties with the values of the wildcard-matched strings.
*
* @param path The requested path
* @param orig The original ActionConfig
* @param vars A Map of wildcard-matched strings
* @return A cloned ActionConfig with appropriate properties replaced with
* wildcard-matched values
* @throws IllegalStateException if a placeholder substitution is
* impossible due to recursion
*/
protected ActionConfig convertActionConfig(String path, ActionConfig orig,
Map vars) {
ActionConfig config = null;
try {
config = (ActionConfig) BeanUtils.cloneBean(orig);
} catch (Exception ex) {
log.warn("Unable to clone action config, recommend not using "
+ "wildcards", ex);
return null;
}
config.setName(convertParam(orig.getName(), vars));
if ((path.length() == 0) || (path.charAt(0) != '/')) {
path = "/" + path;
}
config.setPath(path);
config.setType(convertParam(orig.getType(), vars));
config.setRoles(convertParam(orig.getRoles(), vars));
config.setParameter(convertParam(orig.getParameter(), vars));
config.setAttribute(convertParam(orig.getAttribute(), vars));
config.setForward(convertParam(orig.getForward(), vars));
config.setInclude(convertParam(orig.getInclude(), vars));
config.setInput(convertParam(orig.getInput(), vars));
config.setCatalog(convertParam(orig.getCatalog(), vars));
config.setCommand(convertParam(orig.getCommand(), vars));
config.setMultipartClass(convertParam(orig.getMultipartClass(), vars));
config.setPrefix(convertParam(orig.getPrefix(), vars));
config.setSuffix(convertParam(orig.getSuffix(), vars));
ForwardConfig[] fConfigs = orig.findForwardConfigs();
ForwardConfig cfg;
for (int x = 0; x < fConfigs.length; x++) {
try {
cfg = (ActionForward) BeanUtils.cloneBean(fConfigs[x]);
} catch (Exception ex) {
log.warn("Unable to clone action config, recommend not using "
+ "wildcards", ex);
return null;
}
cfg.setName(fConfigs[x].getName());
cfg.setPath(convertParam(fConfigs[x].getPath(), vars));
cfg.setRedirect(fConfigs[x].getRedirect());
cfg.setCommand(convertParam(fConfigs[x].getCommand(), vars));
cfg.setCatalog(convertParam(fConfigs[x].getCatalog(), vars));
cfg.setModule(convertParam(fConfigs[x].getModule(), vars));
replaceProperties(fConfigs[x].getProperties(), cfg.getProperties(),
vars);
config.removeForwardConfig(fConfigs[x]);
config.addForwardConfig(cfg);
}
replaceProperties(orig.getProperties(), config.getProperties(), vars);
ExceptionConfig[] exConfigs = orig.findExceptionConfigs();
for (int x = 0; x < exConfigs.length; x++) {
config.addExceptionConfig(exConfigs[x]);
}
config.freeze();
return config;
}
/**
* Replaces placeholders from one Properties values set to another.
*
*
* @param orig The original properties set with placehold values
* @param props The target properties to store the processed values
* @param vars A Map of wildcard-matched strings
* @throws IllegalStateException if a placeholder substitution is
* impossible due to recursion
*/
protected void replaceProperties(Properties orig, Properties props, Map vars) {
Map.Entry entry = null;
for (Iterator i = orig.entrySet().iterator(); i.hasNext();) {
entry = (Map.Entry) i.next();
props.setProperty((String) entry.getKey(),
convertParam((String) entry.getValue(), vars));
}
}
/**
* Inserts into a value wildcard-matched strings where specified.
*
*
* @param val The value to convert
* @param vars A Map of wildcard-matched strings
* @return The new value
* @throws IllegalStateException if a placeholder substitution is
* impossible due to recursion
*/
protected String convertParam(String val, Map vars) {
if (val == null) {
return null;
} else if (val.indexOf("{") == -1) {
return val;
}
Map.Entry entry;
StringBuilder key = new StringBuilder("{0}");
StringBuilder ret = new StringBuilder(val);
String keyStr;
int x;
for (Iterator i = vars.entrySet().iterator(); i.hasNext();) {
entry = (Map.Entry) i.next();
key.setCharAt(1, ((String) entry.getKey()).charAt(0));
keyStr = key.toString();
// STR-3169
// Prevent an infinite loop by retaining the placeholders
// that contain itself in the substitution value
if (((String) entry.getValue()).contains(keyStr)) {
throw new IllegalStateException();
}
// Replace all instances of the placeholder
while ((x = ret.toString().indexOf(keyStr)) > -1) {
ret.replace(x, x + 3, (String) entry.getValue());
}
}
return ret.toString();
}
/**
* Stores a compiled wildcard pattern and the ActionConfig it came
* from.
*/
private class Mapping implements Serializable {
/**
* The compiled pattern.
*/
private int[] pattern;
/**
* The original ActionConfig.
*/
private ActionConfig config;
/**
* Contructs a read-only Mapping instance.
*
* @param pattern The compiled pattern
* @param config The original ActionConfig
*/
public Mapping(int[] pattern, ActionConfig config) {
this.pattern = pattern;
this.config = config;
}
/**
* Gets the compiled wildcard pattern.
*
* @return The compiled pattern
*/
public int[] getPattern() {
return this.pattern;
}
/**
* Gets the ActionConfig that contains the pattern.
*
* @return The associated ActionConfig
*/
public ActionConfig getActionConfig() {
return this.config;
}
}
}