mirror of
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135 lines
2.9 KiB
TypeScript
135 lines
2.9 KiB
TypeScript
// Loaded from https://deno.land/x/vary@1.0.0/mod.ts
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/*!
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* Based on https://github.com/jshttp/vary/blob/master/index.js
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* Copyright(c) 2014-2017 Douglas Christopher Wilson
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* Copyright(c) 2020 Henry Zhuang
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* MIT Licensed
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*/
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/**
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* RegExp to match field-name in RFC 7230 sec 3.2
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*
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* field-name = token
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* token = 1*tchar
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* tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*"
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* / "+" / "-" / "." / "^" / "_" / "`" / "|" / "~"
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* / DIGIT / ALPHA
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* ; any VCHAR, except delimiters
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*/
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const FIELD_NAME_REGEXP = /^[!#$%&'*+\-.^_`|~0-9A-Za-z]+$/;
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/**
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* Append a field to a vary header.
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*
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* @param {String} header
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* @param {String|Array} field
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* @return {String}
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* @public
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*/
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export function append(header: string, field: string | string[]): string {
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// if (typeof header !== 'string') {
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// throw new TypeError('header argument is required')
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// }
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// if (!field) {
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// throw new TypeError('field argument is required')
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// }
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// existing, unspecified vary
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if (header === "*") {
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return header;
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}
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// get fields array
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const fields = !Array.isArray(field) ? parse(String(field)) : field;
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// assert on invalid field names
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for (let j = 0; j < fields.length; j++) {
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if (!FIELD_NAME_REGEXP.test(fields[j])) {
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throw new TypeError(
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`field argument contains an invalid header name \`${fields[j]}\``,
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);
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}
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}
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// enumerate current values
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let val = header;
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const vals = parse(header.toLowerCase());
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// unspecified vary
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if (fields.indexOf("*") !== -1 || vals.indexOf("*") !== -1) {
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return "*";
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}
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for (let i = 0; i < fields.length; i++) {
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const fld = fields[i].toLowerCase();
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// append value (case-preserving)
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if (vals.indexOf(fld) === -1) {
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vals.push(fld);
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val = val ? val + ", " + fields[i] : fields[i];
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}
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}
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return val;
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}
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/**
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* Parse a vary header into an array.
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*
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* @param {String} header
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* @return {Array}
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* @private
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*/
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function parse(header: string): string[] {
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let end = 0;
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const list = [];
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let start = 0;
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// gather tokens
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for (let i = 0, len = header.length; i < len; i++) {
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switch (header.charCodeAt(i)) {
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case 0x20:/* */
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if (start === end) {
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start = end = i + 1;
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}
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break;
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case 0x2c:/* , */
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list.push(header.substring(start, end));
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start = end = i + 1;
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break;
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default:
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end = i + 1;
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break;
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}
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}
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// final token
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list.push(header.substring(start, end));
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return list;
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}
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/**
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* Mark that a request is varied on a header field.
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*
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* @param {Headers} header
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* @param {String|Array} field
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* @public
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*/
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export function vary(header: Headers, field: string | string[]): void {
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// get existing header
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let val = header.get("vary") || "";
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// set new header
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if ((val = append(val, field))) {
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header.set("vary", val);
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}
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}
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