com.google.appengine.tools.admin.Utility Maven / Gradle / Ivy
/*
* Copyright 2021 Google LLC
*
* 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
*
* https://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 com.google.appengine.tools.admin;
import com.google.common.base.Joiner;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.logging.Logger;
/**
* Utility methods for this package.
*
*/
public class Utility {
private static final Logger logger = Logger.getLogger(Utility.class.getCanonicalName());
private static final String FORWARD_SLASH = "/";
/** Test for Unix (to include MacOS), vice Windows. */
public static boolean isOsUnix() {
return File.separator.equals(FORWARD_SLASH);
}
/** Test for Windows, vice Unix (to include MacOS). */
public static boolean isOsWindows() {
return !isOsUnix();
}
public static String calculatePath(File f, File base) {
int offset = base.getPath().length();
String path = f.getPath().substring(offset);
// On Windows the filename will include the path separator '\' instead of
// '/'.
// Problem is, this does not the valid filename regex. To handle this,
// we'll replace '\'
// characters with '/'. If '\' was actually in the filename then we'll get
// a
// file not found error, which is correct anyways.
if (File.separatorChar == '\\') {
path = path.replace('\\', '/');
}
// Remove leading slashes or the appserver will choke.
for (offset = 0; path.charAt(offset) == '/'; ++offset) {
// Do nothing. Just find first non-/
}
if (offset > 0) {
path = path.substring(offset);
}
return path;
}
/**
* Escapes the string as a JSON value.
*
* @param s raw string that we want to set as JSON value.
* @return unquoted JSON escaped string
*/
public static String jsonEscape(String s) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < s.length(); i++) {
char ch = s.charAt(i);
switch (ch) {
case '"':
stringBuilder.append("\\\"");
break;
case '\\':
stringBuilder.append("\\\\");
break;
case '\b':
stringBuilder.append("\\b");
break;
case '\f':
stringBuilder.append("\\f");
break;
case '\n':
stringBuilder.append("\\n");
break;
case '\r':
stringBuilder.append("\\r");
break;
case '\t':
stringBuilder.append("\\t");
break;
case '/':
stringBuilder.append("\\/");
break;
default:
if ((ch >= 0x20) && (ch < 0x7f)) {
stringBuilder.append(ch);
} else {
stringBuilder.append(String.format("\\u%04x", (int) ch));
}
break;
}
}
return stringBuilder.toString();
}
private Utility() {
// non-instantiable
}
static Process startProcess(PrintWriter detailsWriter, String... args) throws IOException {
ProcessBuilder builder = new ProcessBuilder(args);
Process proc = builder.redirectErrorStream(true).start();
logger.fine(Joiner.on(" ").join(builder.command()));
new Thread(new OutputPump(proc.getInputStream(), detailsWriter)).start();
return proc;
}
}