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/*
* Copyright © 2016-2017 European Support Limited
*
* Licensed 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.openecomp.sdc.translator.utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.function.BiConsumer;
import java.util.function.Predicate;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;
import org.apache.commons.io.IOUtils;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCategory;
import org.openecomp.sdc.common.errors.ErrorCode;
public class ResourceWalker {
private static final String RESOURCE_FILE_READ_ERROR = "Can't read resource file from class path.";
private ResourceWalker() {
}
/**
* Read resources from directory map.
*
* @param resourceDirectoryToStart the resource directory to start
* @return the map of file where key is file name and value is its data
* @throws Exception the exception
*/
public static Map<String, String> readResourcesFromDirectory(String resourceDirectoryToStart)
throws
Exception {
Map<String, String> filesContent = new HashMap<>();
traverse(resourceDirectoryToStart, (fileName, stream) -> {
try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
filesContent.put(fileName, IOUtils.toString(reader));
} catch (IOException exception) {
throw new CoreException((new ErrorCode.ErrorCodeBuilder())
.withMessage(RESOURCE_FILE_READ_ERROR
+ " File name = " + fileName)
.withId("Resource Read Error").withCategory(ErrorCategory.APPLICATION).build(),
exception);
}
});
return filesContent;
}
private static void traverse(String start, BiConsumer<String, InputStream> handler) throws
Exception {
URL url = ResourceWalker.class.getClassLoader().getResource(start);
if (url == null) {
throw new FileNotFoundException("Resource not found: " + start);
}
switch (url.getProtocol().toLowerCase()) {
case "file":
traverseFile(new File(url.getPath()), handler);
break;
case "zip":
case "jar":
String path = url.getPath();
int resourcePosition = path.lastIndexOf("!/" + start);
traverseArchive(path.substring(0, resourcePosition), start, handler);
break;
default:
throw new IllegalArgumentException("Unknown protocol");
}
}
private static void traverseArchive(String file, String resource, BiConsumer<String, InputStream>
handler)
throws URISyntaxException, IOException {
// There is what looks like a bug in Java:
// if "abc" is a directory in an archive,
// both "abc" and "abc/" will be found successfully.
// However, calling isDirectory() will return "true" for "abc/",
// but "false" for "abc".
try (ZipFile zip = new ZipFile(new URI(file).getPath())) {
Predicate<ZipEntry> predicate = buildPredicate(resource);
Enumeration<? extends ZipEntry> entries = zip.entries();
while (entries.hasMoreElements()) {
handleZipEntry(predicate, zip, entries.nextElement(), handler);
}
}
}
private static Predicate<ZipEntry> buildPredicate(String resource) {
if (resource.endsWith("/")) {
return zipEntry ->
zipEntry.getName().startsWith(resource) && !zipEntry.isDirectory();
} else {
return zipEntry -> {
String name = zipEntry.getName();
return (name.equals(resource) || name.startsWith(resource + "/"))
&& !zipEntry.isDirectory() && !name.contains("../");
};
}
}
private static void handleZipEntry(Predicate<ZipEntry> predicate, ZipFile zip, ZipEntry zipEntry,
BiConsumer<String, InputStream> handler)
throws IOException {
if (predicate.test(zipEntry)) {
try (InputStream input = zip.getInputStream(zipEntry)) {
handler.accept(zipEntry.getName(), input);
}
}
}
private static void traverseFile(File file, BiConsumer<String, InputStream> handler) throws
IOException {
if (file.isDirectory()) {
File[] files = file.listFiles();
if (files != null) {
for (File sub : files) {
traverseFile(sub, handler);
}
}
} else {
try (FileInputStream stream = new FileInputStream(file)) {
handler.accept(file.getPath(), stream);
}
}
}
}
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