48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
'use strict';
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// See http://www.robvanderwoude.com/escapechars.php
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const metaCharsRegExp = /([()\][%!^"`<>&|;, *?])/g;
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function escapeCommand(arg) {
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// Escape meta chars
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arg = arg.replace(metaCharsRegExp, '^$1');
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return arg;
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}
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function escapeArgument(arg, doubleEscapeMetaChars) {
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// Convert to string
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arg = `${arg}`;
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// Algorithm below is based on https://qntm.org/cmd
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// It's slightly altered to disable JS backtracking to avoid hanging on specially crafted input
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// Please see https://github.com/moxystudio/node-cross-spawn/pull/160 for more information
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// Sequence of backslashes followed by a double quote:
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// double up all the backslashes and escape the double quote
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arg = arg.replace(/(?=(\\+?)?)\1"/g, '$1$1\\"');
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// Sequence of backslashes followed by the end of the string
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// (which will become a double quote later):
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// double up all the backslashes
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arg = arg.replace(/(?=(\\+?)?)\1$/, '$1$1');
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// All other backslashes occur literally
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// Quote the whole thing:
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arg = `"${arg}"`;
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// Escape meta chars
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arg = arg.replace(metaCharsRegExp, '^$1');
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// Double escape meta chars if necessary
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if (doubleEscapeMetaChars) {
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arg = arg.replace(metaCharsRegExp, '^$1');
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}
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return arg;
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}
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module.exports.command = escapeCommand;
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module.exports.argument = escapeArgument;
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