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* @fileoverview
*
* Implements utility functions for working with cookies.
* Based on "cookie" library: https://github.com/jshttp/cookie
* */
/**
* Represents a cookie with a name and value.
*/
class Cookie {
constructor(
public readonly name: string,
public readonly value: string
) {}
/**
* Converts the cookie's name and value into a string formatted as a valid cookie.
*
* @return {string} A string representation of the cookie in "name=value" format.
*/
toCookieString(): string {
return `${this.name}=${this.value}`
}
}
/**
* Finds and extracts a specific cookie from a cookie header string.
*
* Searches for a cookie with the specified name in the provided cookie string
* and returns the complete cookie key-value pair (name=value) if found.
*
* @param cookies - The cookie header string containing one or more cookies separated by semicolons
* @param name - The name of the cookie to search for
* @returns The complete cookie string (name=value) if found, undefined otherwise
*
* @example
* findCookie('sessionId=abc123; _iidt=xyz789; theme=dark', '_iidt')
* // returns '_iidt=xyz789'
*
* @example
* findCookie('sessionId=abc123; theme=dark', 'nonexistent')
* // returns undefined
*/
export function findCookie(cookies: string, name: string): string | undefined {
const parsedCookies = parseCookies(cookies)
const value = parsedCookies.get(name)
if (typeof value === 'string') {
return new Cookie(name, value).toCookieString()
}
return undefined
}
/**
* Cookies object.
*/
export type Cookies = Map<string, string | undefined>
/**
* Parse a `Cookie` header.
*
* Parse the given cookie header string into an object
* The object has the various cookies as keys(names) => values
*/
export function parseCookies(str: string): Cookies {
const obj: Cookies = new Map()
const len = str.length
// RFC 6265 sec 4.1.1, RFC 2616 2.2 defines a cookie name consists of one char minimum, plus '='.
if (len < 2) {
return obj
}
let index = 0
do {
const eqIdx = eqIndex(str, index, len)
Iif (eqIdx === -1) {
break
} // No more cookie pairs.
const endIdx = endIndex(str, index, len)
Iif (eqIdx > endIdx) {
// backtrack on prior semicolon
index = str.lastIndexOf(';', eqIdx - 1) + 1
continue
}
const key = valueSlice(str, index, eqIdx)
// only assign once
Eif (obj.get(key) === undefined) {
obj.set(key, valueSlice(str, eqIdx + 1, endIdx))
}
index = endIdx + 1
} while (index < len)
return obj
}
/**
* Find the `;` character between `min` and `len` in str.
*/
function endIndex(str: string, min: number, len: number) {
const index = str.indexOf(';', min)
return index === -1 ? len : index
}
/**
* Find the `=` character between `min` and `max` in str.
*/
function eqIndex(str: string, min: number, max: number) {
const index = str.indexOf('=', min)
return index < max ? index : -1
}
/**
* Slice out a value between startPod to max.
*/
function valueSlice(str: string, min: number, max: number) {
let start = min
let end = max
do {
const code = str.charCodeAt(start)
if (code !== 0x20 /* */ && code !== 0x09 /* \t */) {
break
}
} while (++start < end)
while (end > start) {
const code = str.charCodeAt(end - 1)
if (code !== 0x20 /* */ && code !== 0x09 /* \t */) {
break
}
end--
}
return str.slice(start, end)
}
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