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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tika.batch.fs;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility class to handle some common issues when
* reading from and writing to a file system (FS).
*/
public class FSUtil {
@Deprecated
public static boolean checkThisIsAncestorOfThat(File ancestor, File child) {
int ancLen = ancestor.getAbsolutePath().length();
int childLen = child.getAbsolutePath().length();
if (childLen <= ancLen) {
return false;
}
String childBase = child.getAbsolutePath().substring(0, ancLen);
return childBase.equals(ancestor.getAbsolutePath());
}
@Deprecated
public static boolean checkThisIsAncestorOfOrSameAsThat(File ancestor, File child) {
if (ancestor.equals(child)) {
return true;
}
return checkThisIsAncestorOfThat(ancestor, child);
}
public enum HANDLE_EXISTING {
OVERWRITE,
RENAME,
SKIP
}
private final static Pattern FILE_NAME_PATTERN =
Pattern.compile("\\A(.*?)(?:\\((\\d+)\\))?\\.([^\\.]+)\\Z");
/**
* Given an output root and an initial relative path,
* return the output file according to the HANDLE_EXISTING strategy
*
* In the most basic use case, given a root directory "input",
* a file's relative path "dir1/dir2/fileA.docx", and an output directory
* "output", the output file would be "output/dir1/dir2/fileA.docx."
*
* If HANDLE_EXISTING is set to OVERWRITE, this will not check to see if the output already exists,
* and the returned file could overwrite an existing file!!!
*
* If HANDLE_EXISTING is set to RENAME, this will try to increment a counter at the end of
* the file name (fileA(2).docx) until there is a file name that doesn't exist.
*
* This will return null if handleExisting == HANDLE_EXISTING.SKIP and
* the candidate file already exists.
*
* This will throw an IOException if HANDLE_EXISTING is set to
* RENAME, and a candidate cannot output file cannot be found
* after trying to increment the file count (e.g. fileA(2).docx) 10000 times
* and then after trying 20,000 UUIDs.
*
* @param outputRoot directory root for output
* @param initialRelativePath initial relative path (including file name, which may be renamed)
* @param handleExisting what to do if the output file exists
* @param suffix suffix to add to files, can be null
* @return output file or null if no output file should be created
* @throws java.io.IOException
* @see #getOutputPath(Path, String, HANDLE_EXISTING, String)
*/
@Deprecated
public static File getOutputFile(File outputRoot, String initialRelativePath,
HANDLE_EXISTING handleExisting, String suffix) throws IOException {
return getOutputPath(Paths.get(outputRoot.toURI()),
initialRelativePath, handleExisting, suffix).toFile();
}
/**
* Given an output root and an initial relative path,
* return the output file according to the HANDLE_EXISTING strategy
*
* In the most basic use case, given a root directory "input",
* a file's relative path "dir1/dir2/fileA.docx", and an output directory
* "output", the output file would be "output/dir1/dir2/fileA.docx."
*
* If HANDLE_EXISTING is set to OVERWRITE, this will not check to see if the output already exists,
* and the returned file could overwrite an existing file!!!
*
* If HANDLE_EXISTING is set to RENAME, this will try to increment a counter at the end of
* the file name (fileA(2).docx) until there is a file name that doesn't exist.
*
* This will return null if handleExisting == HANDLE_EXISTING.SKIP and
* the candidate file already exists.
*
* This will throw an IOException if HANDLE_EXISTING is set to
* RENAME, and a candidate cannot output file cannot be found
* after trying to increment the file count (e.g. fileA(2).docx) 10000 times
* and then after trying 20,000 UUIDs.
*
* @param outputRoot root directory into which to put the path
* @param initialRelativePath relative path including file ("somedir/subdir1/file.doc")
* @param handleExisting policy for what to do if the output path already exists
* @param suffix suffix to add to the output path
* @return can return null
* @throws IOException
*/
public static Path getOutputPath(Path outputRoot, String initialRelativePath,
HANDLE_EXISTING handleExisting, String suffix) throws IOException {
String localSuffix = (suffix == null) ? "" : suffix;
Path cand = FSUtil.resolveRelative(outputRoot,
initialRelativePath + "." + localSuffix);
if (Files.exists(cand)) {
if (handleExisting.equals(HANDLE_EXISTING.OVERWRITE)) {
return cand;
} else if (handleExisting.equals(HANDLE_EXISTING.SKIP)) {
return null;
}
}
//if we're here, the output file exists, and
//we must find a new name for it.
//groups for "testfile(1).txt":
//group(1) is "testfile"
//group(2) is 1
//group(3) is "txt"
//Note: group(2) can be null
int cnt = 0;
String fNameBase = null;
String fNameExt = "";
//this doesn't include the addition of the localSuffix
Path candOnly = FSUtil.resolveRelative(outputRoot,
initialRelativePath);
Matcher m = FILE_NAME_PATTERN.matcher(candOnly.getFileName().toString());
if (m.find()) {
fNameBase = m.group(1);
if (m.group(2) != null) {
try {
cnt = Integer.parseInt(m.group(2));
} catch (NumberFormatException e) {
//swallow
}
}
if (m.group(3) != null) {
fNameExt = m.group(3);
}
}
Path outputParent = cand.getParent();
while (fNameBase != null && Files.exists(cand) && ++cnt < 10000) {
String candFileName = fNameBase + "(" + cnt + ")." + fNameExt + "" + localSuffix;
cand = FSUtil.resolveRelative(outputParent, candFileName);
}
//reset count to 0 and try 20000 times
cnt = 0;
while (Files.exists(cand) && cnt++ < 20000) {
UUID uid = UUID.randomUUID();
cand = FSUtil.resolveRelative(outputParent,
uid.toString() + fNameExt + "" + localSuffix);
}
if (Files.exists(cand)) {
throw new IOException("Couldn't find candidate output file after trying " +
"very, very hard");
}
return cand;
}
/**
* Convenience method to ensure that "other" is not an absolute path.
* One could imagine malicious use of this.
*
* @param p
* @param other
* @return resolved path
* @throws IllegalArgumentException if "other" is an absolute path
*/
public static Path resolveRelative(Path p, String other) {
Path op = Paths.get(other);
if (op.isAbsolute()) {
throw new IllegalArgumentException(other + " cannot be an absolute path!");
}
return p.resolve(op);
}
}
