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/*
* Copyright 2010-2019 Ping Identity Corporation
* All Rights Reserved.
*/
/*
* Copyright (C) 2010-2019 Ping Identity Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License (GPLv2 only)
* or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see .
*/
package com.unboundid.util;
import java.util.List;
import java.util.ArrayList;
import java.io.Serializable;
/**
* This class provides access to a form of a command-line argument that is
* safe to use in a shell. It includes both forms for both Unix (bash shell
* specifically) and Windows, since there are differences between the two
* platforms. Quoting of arguments is performed with the following goals:
*
*
*
The same form should be used for both Unix and Windows whenever
* possible.
*
If the same form cannot be used for both platforms, then make it
* as easy as possible to convert the form to the other platform.
*
If neither platform requires quoting of an argument, then it is not
* quoted.
*
*
* To that end, here is the approach that we've taken:
*
*
*
Characters in the output are never escaped with the \ character
* because Windows does not understand \ used to escape.
*
On Unix, double-quotes are used to quote whenever possible since
* Windows does not treat single quotes specially.
*
If a String needs to be quoted on either platform, then it is quoted
* on both. If it needs to be quoted with single-quotes on Unix, then
* it will be quoted with double quotes on Windows.
*
On Unix, single-quote presents a problem if it's included in a
* string that needs to be singled-quoted, for instance one that includes
* the $ or ! characters. In this case, we have to wrap it in
* double-quotes outside of the single-quotes. For instance, Server's!
* would end up as 'Server'"'"'s!'.
*
On Windows, double-quotes present a problem. They have to be
* escaped using two double-quotes inside of a double-quoted string.
* For instance "Quoted" ends up as """Quoted""".
*
*
* All of the forms can be unambiguously parsed using the
* {@link #parseExampleCommandLine} method regardless of the platform. This
* method can be used when needing to parse a command line that was generated
* by this class outside of a shell environment, e.g. if the full command line
* was read from a file. Special characters that are escaped include |, &,
* ;, (, ), !, ", ', *, ?, $, and `.
*/
@ThreadSafety(level = ThreadSafetyLevel.COMPLETELY_THREADSAFE)
public final class ExampleCommandLineArgument implements Serializable
{
private static final long serialVersionUID = 2468880329239320437L;
// The argument that was passed in originally.
private final String rawForm;
// The Unix form of the argument.
private final String unixForm;
// The Windows form of the argument.
private final String windowsForm;
/**
* Private constructor.
*
* @param rawForm The original raw form of the command line argument.
* @param unixForm The Unix form of the argument.
* @param windowsForm The Windows form of the argument.
*/
private ExampleCommandLineArgument(final String rawForm,
final String unixForm,
final String windowsForm)
{
this.rawForm = rawForm;
this.unixForm = unixForm;
this.windowsForm = windowsForm;
}
/**
* Return the original, unquoted raw form of the argument. This is what
* was passed into the {@link #getCleanArgument} method.
*
* @return The original, unquoted form of the argument.
*/
public String getRawForm()
{
return rawForm;
}
/**
* Return the form of the argument that is safe to use in a Unix command
* line shell.
*
* @return The form of the argument that is safe to use in a Unix command
* line shell.
*/
public String getUnixForm()
{
return unixForm;
}
/**
* Return the form of the argument that is safe to use in a Windows command
* line shell.
*
* @return The form of the argument that is safe to use in a Windows command
* line shell.
*/
public String getWindowsForm()
{
return windowsForm;
}
/**
* Return the form of the argument that is safe to use in the command line
* shell of the current operating system platform.
*
* @return The form of the argument that is safe to use in a command line
* shell of the current operating system platform.
*/
public String getLocalForm()
{
if (StaticUtils.isWindows())
{
return getWindowsForm();
}
else
{
return getUnixForm();
}
}
/**
* Return a clean form of the specified argument that can be used directly
* on the command line.
*
* @param argument The raw argument to convert into a clean form that can
* be used directly on the command line.
*
* @return The ExampleCommandLineArgument for the specified argument.
*/
public static ExampleCommandLineArgument getCleanArgument(
final String argument)
{
return new ExampleCommandLineArgument(argument,
getUnixForm(argument),
getWindowsForm(argument));
}
/**
* Return a clean form of the specified argument that can be used directly
* on a Unix command line.
*
* @param argument The raw argument to convert into a clean form that can
* be used directly on the Unix command line.
*
* @return A form of the specified argument that is clean for us on a Unix
* command line.
*/
public static String getUnixForm(final String argument)
{
Validator.ensureNotNull(argument);
final QuotingRequirements requirements = getRequiredUnixQuoting(argument);
String quotedArgument = argument;
if (requirements.requiresSingleQuotesOnUnix())
{
if (requirements.includesSingleQuote())
{
// On the primary Unix shells (e.g. bash), single-quote cannot be
// included in a single-quoted string. So it has to be specified
// outside of the quoted part, and has to be included in "" itself.
quotedArgument = quotedArgument.replace("'", "'\"'\"'");
}
quotedArgument = '\'' + quotedArgument + '\'';
}
else if (requirements.requiresDoubleQuotesOnUnix())
{
quotedArgument = '"' + quotedArgument + '"';
}
return quotedArgument;
}
/**
* Return a clean form of the specified argument that can be used directly
* on a Windows command line.
*
* @param argument The raw argument to convert into a clean form that can
* be used directly on the Windows command line.
*
* @return A form of the specified argument that is clean for us on a Windows
* command line.
*/
public static String getWindowsForm(final String argument)
{
Validator.ensureNotNull(argument);
final QuotingRequirements requirements = getRequiredUnixQuoting(argument);
String quotedArgument = argument;
// Windows only supports double-quotes. They are treated much more like
// single-quotes on Unix. Only " needs to be escaped, and it's done by
// repeating it, i.e. """"" gets passed into the program as just "
if (requirements.requiresSingleQuotesOnUnix() ||
requirements.requiresDoubleQuotesOnUnix())
{
if (requirements.includesDoubleQuote())
{
quotedArgument = quotedArgument.replace("\"", "\"\"");
}
quotedArgument = '"' + quotedArgument + '"';
}
return quotedArgument;
}
/**
* Return a list of raw parameters that were parsed from the specified String.
* This can be used to undo the quoting that was done by
* {@link #getCleanArgument}. It perfectly handles any String that was
* passed into this method, but it won't behave exactly as any single shell
* behaves because they aren't consistent. For instance, it will never
* treat \\ as an escape character.
*
* @param exampleCommandLine The command line to parse.
*
* @return A list of raw arguments that were parsed from the specified
* example usage command line.
*/
public static List parseExampleCommandLine(
final String exampleCommandLine)
{
Validator.ensureNotNull(exampleCommandLine);
boolean inDoubleQuote = false;
boolean inSingleQuote = false;
final List args = new ArrayList<>(20);
StringBuilder currentArg = new StringBuilder();
boolean inArg = false;
for (int i = 0; i < exampleCommandLine.length(); i++) {
final Character c = exampleCommandLine.charAt(i);
Character nextChar = null;
if (i < (exampleCommandLine.length() - 1))
{
nextChar = exampleCommandLine.charAt(i + 1);
}
if (inDoubleQuote)
{
if (c == '"')
{
if ((nextChar != null) && (nextChar == '"'))
{
// Handle the special case on Windows where a " is escaped inside
// of double-quotes using "", i.e. to get " passed into the program,
// """" must be specified.
currentArg.append('\"');
i++;
}
else
{
inDoubleQuote = false;
}
}
else
{
currentArg.append(c);
}
}
else if (inSingleQuote)
{
if (c == '\'')
{
inSingleQuote = false;
}
else
{
currentArg.append(c);
}
}
else if (c == '"')
{
inDoubleQuote = true;
inArg = true;
}
else if (c == '\'')
{
inSingleQuote = true;
inArg = true;
}
else if ((c == ' ') || (c == '\t'))
{
if (inArg)
{
args.add(currentArg.toString());
currentArg = new StringBuilder();
inArg = false;
}
}
else
{
currentArg.append(c);
inArg = true;
}
}
if (inArg)
{
args.add(currentArg.toString());
}
return args;
}
/**
* Examines the specified argument to determine how it will need to be
* quoted.
*
* @param argument The argument to examine.
*
* @return The QuotingRequirements for the specified argument.
*/
private static QuotingRequirements getRequiredUnixQuoting(
final String argument)
{
boolean requiresDoubleQuotes = false;
boolean requiresSingleQuotes = false;
boolean includesDoubleQuote = false;
boolean includesSingleQuote = false;
if (argument.isEmpty())
{
requiresDoubleQuotes = true;
}
for (int i=0; i < argument.length(); i++)
{
final char c = argument.charAt(i);
switch (c)
{
case '"':
includesDoubleQuote = true;
requiresSingleQuotes = true;
break;
case '\\':
case '!':
case '`':
case '$':
case '@':
case '*':
requiresSingleQuotes = true;
break;
case '\'':
includesSingleQuote = true;
requiresDoubleQuotes = true;
break;
case ' ':
case '|':
case '&':
case ';':
case '(':
case ')':
case '<':
case '>':
requiresDoubleQuotes = true;
break;
case ',':
case '=':
case '-':
case '_':
case ':':
case '.':
case '/':
// These are safe, so just ignore them.
break;
default:
if (((c >= 'a') && (c <= 'z')) ||
((c >= 'A') && (c <= 'Z')) ||
((c >= '0') && (c <= '9')))
{
// These are safe, so just ignore them.
}
else
{
requiresDoubleQuotes = true;
}
}
}
if (requiresSingleQuotes)
{
// Single-quoting trumps double-quotes.
requiresDoubleQuotes = false;
}
return new QuotingRequirements(requiresSingleQuotes, requiresDoubleQuotes,
includesSingleQuote, includesDoubleQuote);
}
}
