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cookies.ts
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cookies.ts
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/**
* Set-Cookie header field-values are sometimes comma joined in one string. This splits them without choking on commas
* that are within a single set-cookie field-value, such as in the Expires portion.
* This is uncommon, but explicitly allowed - see https://tools.ietf.org/html/rfc2616#section-4.2
* Node.js does this for every header *except* set-cookie - see https://github.com/nodejs/node/blob/d5e363b77ebaf1caf67cd7528224b651c86815c1/lib/_http_incoming.js#L128
* Based on: https://github.com/google/j2objc/commit/16820fdbc8f76ca0c33472810ce0cb03d20efe25
* Credits to: https://github.com/tomball for original and https://github.com/chrusart for JavaScript implementation
* @source https://github.com/nfriedly/set-cookie-parser/blob/3eab8b7d5d12c8ed87832532861c1a35520cf5b3/lib/set-cookie.js#L144
*/
export default function splitCookiesString(cookiesString: string): string[] {
if (typeof cookiesString !== "string") {
return [];
}
const cookiesStrings: string[] = [];
let pos = 0;
let start;
let ch;
let lastComma: number;
let nextStart;
let cookiesSeparatorFound;
function skipWhitespace() {
while (pos < cookiesString.length && /\s/.test(cookiesString.charAt(pos))) {
pos += 1;
}
return pos < cookiesString.length;
}
function notSpecialChar() {
ch = cookiesString.charAt(pos);
return ch !== "=" && ch !== ";" && ch !== ",";
}
while (pos < cookiesString.length) {
start = pos;
cookiesSeparatorFound = false;
while (skipWhitespace()) {
ch = cookiesString.charAt(pos);
if (ch === ",") {
// ',' is a cookie separator if we have later first '=', not ';' or ','
lastComma = pos;
pos += 1;
skipWhitespace();
nextStart = pos;
while (pos < cookiesString.length && notSpecialChar()) {
pos += 1;
}
// currently special character
if (pos < cookiesString.length && cookiesString.charAt(pos) === "=") {
// we found cookies separator
cookiesSeparatorFound = true;
// pos is inside the next cookie, so back up and return it.
pos = nextStart;
cookiesStrings.push(cookiesString.slice(start, lastComma));
start = pos;
} else {
// in param ',' or param separator ';',
// we continue from that comma
pos = lastComma + 1;
}
} else {
pos += 1;
}
}
if (!cookiesSeparatorFound || pos >= cookiesString.length) {
cookiesStrings.push(cookiesString.slice(start, cookiesString.length));
}
}
return cookiesStrings;
}