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-
-
- 'use strict'
-
-
-
- module.exports = vary
- module.exports.append = append
-
-
-
- var FIELD_NAME_REGEXP = /^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$/
-
-
-
- function append (header, field) {
- if (typeof header !== 'string') {
- throw new TypeError('header argument is required')
- }
-
- if (!field) {
- throw new TypeError('field argument is required')
- }
-
-
- var fields = !Array.isArray(field)
- ? parse(String(field))
- : field
-
-
- 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')
- }
- }
-
-
- if (header === '*') {
- return header
- }
-
-
- var val = header
- var vals = parse(header.toLowerCase())
-
-
- if (fields.indexOf('*') !== -1 || vals.indexOf('*') !== -1) {
- return '*'
- }
-
- for (var i = 0; i < fields.length; i++) {
- var fld = fields[i].toLowerCase()
-
-
- if (vals.indexOf(fld) === -1) {
- vals.push(fld)
- val = val
- ? val + ', ' + fields[i]
- : fields[i]
- }
- }
-
- return val
- }
-
-
-
- function parse (header) {
- var end = 0
- var list = []
- var start = 0
-
-
- 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
- }
- }
-
-
- list.push(header.substring(start, end))
-
- return list
- }
-
-
-
- function vary (res, field) {
- if (!res || !res.getHeader || !res.setHeader) {
-
- throw new TypeError('res argument is required')
- }
-
-
- var val = res.getHeader('Vary') || ''
- var header = Array.isArray(val)
- ? val.join(', ')
- : String(val)
-
-
- if ((val = append(header, field))) {
- res.setHeader('Vary', val)
- }
- }
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