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Diffstat (limited to 'node_modules/vary/index.js')
-rw-r--r-- | node_modules/vary/index.js | 149 |
1 files changed, 0 insertions, 149 deletions
diff --git a/node_modules/vary/index.js b/node_modules/vary/index.js deleted file mode 100644 index 5b5e741..0000000 --- a/node_modules/vary/index.js +++ /dev/null @@ -1,149 +0,0 @@ -/*! - * vary - * Copyright(c) 2014-2017 Douglas Christopher Wilson - * MIT Licensed - */ - -'use strict' - -/** - * Module exports. - */ - -module.exports = vary -module.exports.append = append - -/** - * RegExp to match field-name in RFC 7230 sec 3.2 - * - * field-name = token - * token = 1*tchar - * tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" - * / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~" - * / DIGIT / ALPHA - * ; any VCHAR, except delimiters - */ - -var FIELD_NAME_REGEXP = /^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$/ - -/** - * Append a field to a vary header. - * - * @param {String} header - * @param {String|Array} field - * @return {String} - * @public - */ - -function append (header, field) { - if (typeof header !== 'string') { - throw new TypeError('header argument is required') - } - - if (!field) { - throw new TypeError('field argument is required') - } - - // get fields array - var fields = !Array.isArray(field) - ? parse(String(field)) - : field - - // assert on invalid field names - for (var j = 0; j < fields.length; j++) { - if (!FIELD_NAME_REGEXP.test(fields[j])) { - throw new TypeError('field argument contains an invalid header name') - } - } - - // existing, unspecified vary - if (header === '*') { - return header - } - - // enumerate current values - var val = header - var vals = parse(header.toLowerCase()) - - // unspecified vary - if (fields.indexOf('*') !== -1 || vals.indexOf('*') !== -1) { - return '*' - } - - for (var i = 0; i < fields.length; i++) { - var fld = fields[i].toLowerCase() - - // append value (case-preserving) - if (vals.indexOf(fld) === -1) { - vals.push(fld) - val = val - ? val + ', ' + fields[i] - : fields[i] - } - } - - return val -} - -/** - * Parse a vary header into an array. - * - * @param {String} header - * @return {Array} - * @private - */ - -function parse (header) { - var end = 0 - var list = [] - var start = 0 - - // gather tokens - for (var i = 0, len = header.length; i < len; i++) { - switch (header.charCodeAt(i)) { - case 0x20: /* */ - if (start === end) { - start = end = i + 1 - } - break - case 0x2c: /* , */ - list.push(header.substring(start, end)) - start = end = i + 1 - break - default: - end = i + 1 - break - } - } - - // final token - list.push(header.substring(start, end)) - - return list -} - -/** - * Mark that a request is varied on a header field. - * - * @param {Object} res - * @param {String|Array} field - * @public - */ - -function vary (res, field) { - if (!res || !res.getHeader || !res.setHeader) { - // quack quack - throw new TypeError('res argument is required') - } - - // get existing header - var val = res.getHeader('Vary') || '' - var header = Array.isArray(val) - ? val.join(', ') - : String(val) - - // set new header - if ((val = append(header, field))) { - res.setHeader('Vary', val) - } -} |