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authorMinteck <contact@minteck.org>2022-11-28 17:14:38 +0100
committerMinteck <contact@minteck.org>2022-11-28 17:14:38 +0100
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+# cookie
+
+[![NPM Version][npm-version-image]][npm-url]
+[![NPM Downloads][npm-downloads-image]][npm-url]
+[![Node.js Version][node-version-image]][node-version-url]
+[![Build Status][github-actions-ci-image]][github-actions-ci-url]
+[![Test Coverage][coveralls-image]][coveralls-url]
+
+Basic HTTP cookie parser and serializer for HTTP servers.
+
+## Installation
+
+This is a [Node.js](https://nodejs.org/en/) module available through the
+[npm registry](https://www.npmjs.com/). Installation is done using the
+[`npm install` command](https://docs.npmjs.com/getting-started/installing-npm-packages-locally):
+
+```sh
+$ npm install cookie
+```
+
+## API
+
+```js
+var cookie = require('cookie');
+```
+
+### cookie.parse(str, options)
+
+Parse an HTTP `Cookie` header string and returning an object of all cookie name-value pairs.
+The `str` argument is the string representing a `Cookie` header value and `options` is an
+optional object containing additional parsing options.
+
+```js
+var cookies = cookie.parse('foo=bar; equation=E%3Dmc%5E2');
+// { foo: 'bar', equation: 'E=mc^2' }
+```
+
+#### Options
+
+`cookie.parse` accepts these properties in the options object.
+
+##### decode
+
+Specifies a function that will be used to decode a cookie's value. Since the value of a cookie
+has a limited character set (and must be a simple string), this function can be used to decode
+a previously-encoded cookie value into a JavaScript string or other object.
+
+The default function is the global `decodeURIComponent`, which will decode any URL-encoded
+sequences into their byte representations.
+
+**note** if an error is thrown from this function, the original, non-decoded cookie value will
+be returned as the cookie's value.
+
+### cookie.serialize(name, value, options)
+
+Serialize a cookie name-value pair into a `Set-Cookie` header string. The `name` argument is the
+name for the cookie, the `value` argument is the value to set the cookie to, and the `options`
+argument is an optional object containing additional serialization options.
+
+```js
+var setCookie = cookie.serialize('foo', 'bar');
+// foo=bar
+```
+
+#### Options
+
+`cookie.serialize` accepts these properties in the options object.
+
+##### domain
+
+Specifies the value for the [`Domain` `Set-Cookie` attribute][rfc-6265-5.2.3]. By default, no
+domain is set, and most clients will consider the cookie to apply to only the current domain.
+
+##### encode
+
+Specifies a function that will be used to encode a cookie's value. Since value of a cookie
+has a limited character set (and must be a simple string), this function can be used to encode
+a value into a string suited for a cookie's value.
+
+The default function is the global `encodeURIComponent`, which will encode a JavaScript string
+into UTF-8 byte sequences and then URL-encode any that fall outside of the cookie range.
+
+##### expires
+
+Specifies the `Date` object to be the value for the [`Expires` `Set-Cookie` attribute][rfc-6265-5.2.1].
+By default, no expiration is set, and most clients will consider this a "non-persistent cookie" and
+will delete it on a condition like exiting a web browser application.
+
+**note** the [cookie storage model specification][rfc-6265-5.3] states that if both `expires` and
+`maxAge` are set, then `maxAge` takes precedence, but it is possible not all clients by obey this,
+so if both are set, they should point to the same date and time.
+
+##### httpOnly
+
+Specifies the `boolean` value for the [`HttpOnly` `Set-Cookie` attribute][rfc-6265-5.2.6]. When truthy,
+the `HttpOnly` attribute is set, otherwise it is not. By default, the `HttpOnly` attribute is not set.
+
+**note** be careful when setting this to `true`, as compliant clients will not allow client-side
+JavaScript to see the cookie in `document.cookie`.
+
+##### maxAge
+
+Specifies the `number` (in seconds) to be the value for the [`Max-Age` `Set-Cookie` attribute][rfc-6265-5.2.2].
+The given number will be converted to an integer by rounding down. By default, no maximum age is set.
+
+**note** the [cookie storage model specification][rfc-6265-5.3] states that if both `expires` and
+`maxAge` are set, then `maxAge` takes precedence, but it is possible not all clients by obey this,
+so if both are set, they should point to the same date and time.
+
+##### path
+
+Specifies the value for the [`Path` `Set-Cookie` attribute][rfc-6265-5.2.4]. By default, the path
+is considered the ["default path"][rfc-6265-5.1.4].
+
+##### priority
+
+Specifies the `string` to be the value for the [`Priority` `Set-Cookie` attribute][rfc-west-cookie-priority-00-4.1].
+
+ - `'low'` will set the `Priority` attribute to `Low`.
+ - `'medium'` will set the `Priority` attribute to `Medium`, the default priority when not set.
+ - `'high'` will set the `Priority` attribute to `High`.
+
+More information about the different priority levels can be found in
+[the specification][rfc-west-cookie-priority-00-4.1].
+
+**note** This is an attribute that has not yet been fully standardized, and may change in the future.
+This also means many clients may ignore this attribute until they understand it.
+
+##### sameSite
+
+Specifies the `boolean` or `string` to be the value for the [`SameSite` `Set-Cookie` attribute][rfc-6265bis-09-5.4.7].
+
+ - `true` will set the `SameSite` attribute to `Strict` for strict same site enforcement.
+ - `false` will not set the `SameSite` attribute.
+ - `'lax'` will set the `SameSite` attribute to `Lax` for lax same site enforcement.
+ - `'none'` will set the `SameSite` attribute to `None` for an explicit cross-site cookie.
+ - `'strict'` will set the `SameSite` attribute to `Strict` for strict same site enforcement.
+
+More information about the different enforcement levels can be found in
+[the specification][rfc-6265bis-09-5.4.7].
+
+**note** This is an attribute that has not yet been fully standardized, and may change in the future.
+This also means many clients may ignore this attribute until they understand it.
+
+##### secure
+
+Specifies the `boolean` value for the [`Secure` `Set-Cookie` attribute][rfc-6265-5.2.5]. When truthy,
+the `Secure` attribute is set, otherwise it is not. By default, the `Secure` attribute is not set.
+
+**note** be careful when setting this to `true`, as compliant clients will not send the cookie back to
+the server in the future if the browser does not have an HTTPS connection.
+
+## Example
+
+The following example uses this module in conjunction with the Node.js core HTTP server
+to prompt a user for their name and display it back on future visits.
+
+```js
+var cookie = require('cookie');
+var escapeHtml = require('escape-html');
+var http = require('http');
+var url = require('url');
+
+function onRequest(req, res) {
+ // Parse the query string
+ var query = url.parse(req.url, true, true).query;
+
+ if (query && query.name) {
+ // Set a new cookie with the name
+ res.setHeader('Set-Cookie', cookie.serialize('name', String(query.name), {
+ httpOnly: true,
+ maxAge: 60 * 60 * 24 * 7 // 1 week
+ }));
+
+ // Redirect back after setting cookie
+ res.statusCode = 302;
+ res.setHeader('Location', req.headers.referer || '/');
+ res.end();
+ return;
+ }
+
+ // Parse the cookies on the request
+ var cookies = cookie.parse(req.headers.cookie || '');
+
+ // Get the visitor name set in the cookie
+ var name = cookies.name;
+
+ res.setHeader('Content-Type', 'text/html; charset=UTF-8');
+
+ if (name) {
+ res.write('<p>Welcome back, <b>' + escapeHtml(name) + '</b>!</p>');
+ } else {
+ res.write('<p>Hello, new visitor!</p>');
+ }
+
+ res.write('<form method="GET">');
+ res.write('<input placeholder="enter your name" name="name"> <input type="submit" value="Set Name">');
+ res.end('</form>');
+}
+
+http.createServer(onRequest).listen(3000);
+```
+
+## Testing
+
+```sh
+$ npm test
+```
+
+## Benchmark
+
+```
+$ npm run bench
+
+> cookie@0.4.2 bench
+> node benchmark/index.js
+
+ node@16.14.0
+ v8@9.4.146.24-node.20
+ uv@1.43.0
+ zlib@1.2.11
+ brotli@1.0.9
+ ares@1.18.1
+ modules@93
+ nghttp2@1.45.1
+ napi@8
+ llhttp@6.0.4
+ openssl@1.1.1m+quic
+ cldr@40.0
+ icu@70.1
+ tz@2021a3
+ unicode@14.0
+ ngtcp2@0.1.0-DEV
+ nghttp3@0.1.0-DEV
+
+> node benchmark/parse-top.js
+
+ cookie.parse - top sites
+
+ 15 tests completed.
+
+ parse accounts.google.com x 2,421,245 ops/sec ±0.80% (188 runs sampled)
+ parse apple.com x 2,684,710 ops/sec ±0.59% (189 runs sampled)
+ parse cloudflare.com x 2,231,418 ops/sec ±0.76% (186 runs sampled)
+ parse docs.google.com x 2,316,357 ops/sec ±1.28% (187 runs sampled)
+ parse drive.google.com x 2,363,543 ops/sec ±0.49% (189 runs sampled)
+ parse en.wikipedia.org x 839,414 ops/sec ±0.53% (189 runs sampled)
+ parse linkedin.com x 553,797 ops/sec ±0.63% (190 runs sampled)
+ parse maps.google.com x 1,314,779 ops/sec ±0.72% (189 runs sampled)
+ parse microsoft.com x 153,783 ops/sec ±0.53% (190 runs sampled)
+ parse play.google.com x 2,249,574 ops/sec ±0.59% (187 runs sampled)
+ parse plus.google.com x 2,258,682 ops/sec ±0.60% (188 runs sampled)
+ parse sites.google.com x 2,247,069 ops/sec ±0.68% (189 runs sampled)
+ parse support.google.com x 1,456,840 ops/sec ±0.70% (187 runs sampled)
+ parse www.google.com x 1,046,028 ops/sec ±0.58% (188 runs sampled)
+ parse youtu.be x 937,428 ops/sec ±1.47% (190 runs sampled)
+ parse youtube.com x 963,878 ops/sec ±0.59% (190 runs sampled)
+
+> node benchmark/parse.js
+
+ cookie.parse - generic
+
+ 6 tests completed.
+
+ simple x 2,745,604 ops/sec ±0.77% (185 runs sampled)
+ decode x 557,287 ops/sec ±0.60% (188 runs sampled)
+ unquote x 2,498,475 ops/sec ±0.55% (189 runs sampled)
+ duplicates x 868,591 ops/sec ±0.89% (187 runs sampled)
+ 10 cookies x 306,745 ops/sec ±0.49% (190 runs sampled)
+ 100 cookies x 22,414 ops/sec ±2.38% (182 runs sampled)
+```
+
+## References
+
+- [RFC 6265: HTTP State Management Mechanism][rfc-6265]
+- [Same-site Cookies][rfc-6265bis-09-5.4.7]
+
+[rfc-west-cookie-priority-00-4.1]: https://tools.ietf.org/html/draft-west-cookie-priority-00#section-4.1
+[rfc-6265bis-09-5.4.7]: https://tools.ietf.org/html/draft-ietf-httpbis-rfc6265bis-09#section-5.4.7
+[rfc-6265]: https://tools.ietf.org/html/rfc6265
+[rfc-6265-5.1.4]: https://tools.ietf.org/html/rfc6265#section-5.1.4
+[rfc-6265-5.2.1]: https://tools.ietf.org/html/rfc6265#section-5.2.1
+[rfc-6265-5.2.2]: https://tools.ietf.org/html/rfc6265#section-5.2.2
+[rfc-6265-5.2.3]: https://tools.ietf.org/html/rfc6265#section-5.2.3
+[rfc-6265-5.2.4]: https://tools.ietf.org/html/rfc6265#section-5.2.4
+[rfc-6265-5.2.5]: https://tools.ietf.org/html/rfc6265#section-5.2.5
+[rfc-6265-5.2.6]: https://tools.ietf.org/html/rfc6265#section-5.2.6
+[rfc-6265-5.3]: https://tools.ietf.org/html/rfc6265#section-5.3
+
+## License
+
+[MIT](LICENSE)
+
+[coveralls-image]: https://badgen.net/coveralls/c/github/jshttp/cookie/master
+[coveralls-url]: https://coveralls.io/r/jshttp/cookie?branch=master
+[github-actions-ci-image]: https://img.shields.io/github/workflow/status/jshttp/cookie/ci/master?label=ci
+[github-actions-ci-url]: https://github.com/jshttp/cookie/actions/workflows/ci.yml
+[node-version-image]: https://badgen.net/npm/node/cookie
+[node-version-url]: https://nodejs.org/en/download
+[npm-downloads-image]: https://badgen.net/npm/dm/cookie
+[npm-url]: https://npmjs.org/package/cookie
+[npm-version-image]: https://badgen.net/npm/v/cookie