org.eclipse.jetty.start.PathMatchers Maven / Gradle / Ivy
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//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.start;
import java.io.IOException;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.PathMatcher;
import java.nio.file.Paths;
/**
* Common PathMatcher implementations.
*/
public class PathMatchers
{
private static class NonHiddenMatcher implements PathMatcher
{
@Override
public boolean matches(Path path)
{
try
{
return !Files.isHidden(path);
}
catch (IOException e)
{
StartLog.debug(e);
return false;
}
}
}
private static final char[] GLOB_CHARS = "*?".toCharArray();
private static final char[] SYNTAXED_GLOB_CHARS = "{}[]|:".toCharArray();
private static final Path EMPTY_PATH = Paths.get(".");
/**
* Convert a pattern to a Path object.
*
* @param pattern the raw pattern (can contain "glob:" or "regex:" syntax indicator)
* @return the Path version of the pattern provided.
*/
private static Path asPath(final String pattern)
{
String test = pattern;
if (test.startsWith("glob:"))
{
test = test.substring("glob:".length());
}
else if (test.startsWith("regex:"))
{
test = test.substring("regex:".length());
}
return Paths.get(test);
}
public static PathMatcher getMatcher(final String rawpattern)
{
FileSystem fs = FileSystems.getDefault();
String pattern = rawpattern;
// Strip trailing slash (if present)
int lastchar = pattern.charAt(pattern.length() - 1);
if (lastchar == '/' || lastchar == '\\')
{
pattern = pattern.substring(0, pattern.length() - 1);
}
// If using FileSystem.getPathMatcher() with "glob:" or "regex:"
// use FileSystem default pattern behavior
if (pattern.startsWith("glob:") || pattern.startsWith("regex:"))
{
StartLog.debug("Using Standard %s pattern: %s", fs.getClass().getName(), pattern);
return fs.getPathMatcher(pattern);
}
// If the pattern starts with a root path then its assumed to
// be a full system path
if (isAbsolute(pattern))
{
String pat = "glob:" + pattern;
StartLog.debug("Using absolute path pattern: %s", pat);
return fs.getPathMatcher(pat);
}
// Doesn't start with filesystem root, then assume the pattern
// is a relative file path pattern.
String pat = "glob:**/" + pattern;
StartLog.debug("Using relative path pattern: %s", pat);
return fs.getPathMatcher(pat);
}
public static PathMatcher getNonHidden()
{
return new NonHiddenMatcher();
}
/**
* Provide the non-glob / non-regex prefix on the pattern as a Path reference.
*
* @param pattern the pattern to test
* @return the Path representing the search root for the pattern provided.
*/
public static Path getSearchRoot(final String pattern)
{
StringBuilder root = new StringBuilder();
int start = 0;
boolean syntaxed = false;
if (pattern.startsWith("glob:"))
{
start = "glob:".length();
syntaxed = true;
}
else if (pattern.startsWith("regex:"))
{
start = "regex:".length();
syntaxed = true;
}
int len = pattern.length();
int lastSep = 0;
for (int i = start; i < len; i++)
{
int cp = pattern.codePointAt(i);
if (cp < 127)
{
char c = (char)cp;
// unix path case
if (c == '/')
{
root.append(c);
lastSep = root.length();
}
else if (c == '\\')
{
root.append("\\");
lastSep = root.length();
// possible escaped sequence.
// only really interested in windows escape sequences "\\"
int count = countChars(pattern, i + 1, '\\');
if (count > 0)
{
// skip extra slashes
i += count;
}
}
else
{
if (isGlob(c, syntaxed))
{
break;
}
root.append(c);
}
}
else
{
root.appendCodePoint(cp);
}
}
String rootPath = root.substring(0, lastSep);
if (rootPath.length() <= 0)
{
return EMPTY_PATH;
}
return asPath(rootPath);
}
private static int countChars(String pattern, int offset, char c)
{
int count = 0;
int len = pattern.length();
for (int i = offset; i < len; i++)
{
if (pattern.charAt(i) == c)
{
count++;
}
else
{
break;
}
}
return count;
}
/**
* Tests if provided pattern is an absolute reference (or not)
*
* @param pattern the pattern to test
* @return true if pattern is an absolute reference.
*/
public static boolean isAbsolute(final String pattern)
{
Path searchRoot = getSearchRoot(pattern);
if (searchRoot == EMPTY_PATH)
{
return false;
}
return searchRoot.isAbsolute();
}
/**
* Determine if part is a glob pattern.
*
* @param c the char to check
* @param syntaxed true if overall pattern is syntaxed with "glob:" or "regex:"
* @return true if part has glob characters
*/
private static boolean isGlob(char c, boolean syntaxed)
{
for (char g : GLOB_CHARS)
{
if (c == g)
{
return true;
}
}
if (syntaxed)
{
for (char g : SYNTAXED_GLOB_CHARS)
{
if (c == g)
{
return true;
}
}
}
return false;
}
}