37 lines
1.1 KiB
JavaScript
37 lines
1.1 KiB
JavaScript
module.exports = function parseCacheControl(field) {
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if (typeof field !== 'string') {
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return null;
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}
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/*
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Cache-Control = 1#cache-directive
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cache-directive = token [ "=" ( token / quoted-string ) ]
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token = [^\x00-\x20\(\)<>@\,;\:\\"\/\[\]\?\=\{\}\x7F]+
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quoted-string = "(?:[^"\\]|\\.)*"
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*/
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// 1: directive = 2: token 3: quoted-string
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var regex = /(?:^|(?:\s*\,\s*))([^\x00-\x20\(\)<>@\,;\:\\"\/\[\]\?\=\{\}\x7F]+)(?:\=(?:([^\x00-\x20\(\)<>@\,;\:\\"\/\[\]\?\=\{\}\x7F]+)|(?:\"((?:[^"\\]|\\.)*)\")))?/g;
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var header = {};
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var err = field.replace(regex, function($0, $1, $2, $3) {
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var value = $2 || $3;
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header[$1] = value ? value.toLowerCase() : true;
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return '';
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});
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if (header['max-age']) {
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try {
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var maxAge = parseInt(header['max-age'], 10);
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if (isNaN(maxAge)) {
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return null;
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}
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header['max-age'] = maxAge;
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}
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catch (err) { }
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}
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return (err ? null : header);
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};
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