third_party/devtools/node_modules/cookie/README.md - cobalt - Git at Google

 # cookie

 [![NPM Version][npm-image]][npm-url]
 [![NPM Downloads][downloads-image]][downloads-url]
 [![Node.js Version][node-version-image]][node-version-url]
 [![Build Status][travis-image]][travis-url]
 [![Test Coverage][coveralls-image]][coveralls-url]

 Basic HTTP cookie parser and serializer for HTTP servers.

 ## Installation

 ```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-6266-5.2.3]. 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 `ecodeURIComponent`, 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-6266-5.2.1].
 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-6266-5.3] states that if both `expires` and
 `magAge` are set, then `maxAge` takes precedence, but it is possiblke 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-6266-5.2.6]. 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-6266-5.2.2].
 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-6266-5.3] states that if both `expires` and
 `magAge` are set, then `maxAge` takes precedence, but it is possiblke 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-6266-5.2.4]. By default, the path
 is considered the ["default path"][rfc-6266-5.1.4]. By default, no maximum age 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.

 ##### sameSite

 Specifies the `boolean` or `string` to be the value for the [`SameSite` `Set-Cookie` attribute][draft-west-first-party-cookies-07].

   - `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.
   - `'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
 https://tools.ietf.org/html/draft-west-first-party-cookies-07#section-4.1.1

 **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.

 ##### secure

 Specifies the `boolean` value for the [`Secure` `Set-Cookie` attribute][rfc-6266-5.2.5]. 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
 ```

 ## References

 - [RFC 6266: HTTP State Management Mechanism][rfc-6266]
 - [Same-site Cookies][draft-west-first-party-cookies-07]

 [draft-west-first-party-cookies-07]: https://tools.ietf.org/html/draft-west-first-party-cookies-07
 [rfc-6266]: https://tools.ietf.org/html/rfc6266
 [rfc-6266-5.1.4]: https://tools.ietf.org/html/rfc6266#section-5.1.4
 [rfc-6266-5.2.1]: https://tools.ietf.org/html/rfc6266#section-5.2.1
 [rfc-6266-5.2.2]: https://tools.ietf.org/html/rfc6266#section-5.2.2
 [rfc-6266-5.2.3]: https://tools.ietf.org/html/rfc6266#section-5.2.3
 [rfc-6266-5.2.4]: https://tools.ietf.org/html/rfc6266#section-5.2.4
 [rfc-6266-5.3]: https://tools.ietf.org/html/rfc6266#section-5.3

 ## License

 [MIT](LICENSE)

 [npm-image]: https://img.shields.io/npm/v/cookie.svg
 [npm-url]: https://npmjs.org/package/cookie
 [node-version-image]: https://img.shields.io/node/v/cookie.svg
 [node-version-url]: https://nodejs.org/en/download
 [travis-image]: https://img.shields.io/travis/jshttp/cookie/master.svg
 [travis-url]: https://travis-ci.org/jshttp/cookie
 [coveralls-image]: https://img.shields.io/coveralls/jshttp/cookie/master.svg
 [coveralls-url]: https://coveralls.io/r/jshttp/cookie?branch=master
 [downloads-image]: https://img.shields.io/npm/dm/cookie.svg
 [downloads-url]: https://npmjs.org/package/cookie
	# cookie

	[![NPM Version][npm-image]][npm-url]
	[![NPM Downloads][downloads-image]][downloads-url]
	[![Node.js Version][node-version-image]][node-version-url]
	[![Build Status][travis-image]][travis-url]
	[![Test Coverage][coveralls-image]][coveralls-url]

	Basic HTTP cookie parser and serializer for HTTP servers.

	## Installation

	```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-6266-5.2.3]. 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 `ecodeURIComponent`, 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-6266-5.2.1].
	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-6266-5.3] states that if both `expires` and
	`magAge` are set, then `maxAge` takes precedence, but it is possiblke 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-6266-5.2.6]. 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-6266-5.2.2].
	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-6266-5.3] states that if both `expires` and
	`magAge` are set, then `maxAge` takes precedence, but it is possiblke 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-6266-5.2.4]. By default, the path
	is considered the ["default path"][rfc-6266-5.1.4]. By default, no maximum age 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.

	##### sameSite

	Specifies the `boolean` or `string` to be the value for the [`SameSite` `Set-Cookie` attribute][draft-west-first-party-cookies-07].

	- `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.
	- `'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
	https://tools.ietf.org/html/draft-west-first-party-cookies-07#section-4.1.1

	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.

	##### secure

	Specifies the `boolean` value for the [`Secure` `Set-Cookie` attribute][rfc-6266-5.2.5]. 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
	```

	## References

	- [RFC 6266: HTTP State Management Mechanism][rfc-6266]
	- [Same-site Cookies][draft-west-first-party-cookies-07]

	[draft-west-first-party-cookies-07]: https://tools.ietf.org/html/draft-west-first-party-cookies-07
	[rfc-6266]: https://tools.ietf.org/html/rfc6266
	[rfc-6266-5.1.4]: https://tools.ietf.org/html/rfc6266#section-5.1.4
	[rfc-6266-5.2.1]: https://tools.ietf.org/html/rfc6266#section-5.2.1
	[rfc-6266-5.2.2]: https://tools.ietf.org/html/rfc6266#section-5.2.2
	[rfc-6266-5.2.3]: https://tools.ietf.org/html/rfc6266#section-5.2.3
	[rfc-6266-5.2.4]: https://tools.ietf.org/html/rfc6266#section-5.2.4
	[rfc-6266-5.3]: https://tools.ietf.org/html/rfc6266#section-5.3

	## License

	[MIT](LICENSE)

	[npm-image]: https://img.shields.io/npm/v/cookie.svg
	[npm-url]: https://npmjs.org/package/cookie
	[node-version-image]: https://img.shields.io/node/v/cookie.svg
	[node-version-url]: https://nodejs.org/en/download
	[travis-image]: https://img.shields.io/travis/jshttp/cookie/master.svg
	[travis-url]: https://travis-ci.org/jshttp/cookie
	[coveralls-image]: https://img.shields.io/coveralls/jshttp/cookie/master.svg
	[coveralls-url]: https://coveralls.io/r/jshttp/cookie?branch=master
	[downloads-image]: https://img.shields.io/npm/dm/cookie.svg
	[downloads-url]: https://npmjs.org/package/cookie