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528 lines
27 KiB
528 lines
27 KiB
[RFC6265](https://tools.ietf.org/html/rfc6265) Cookies and CookieJar for Node.js
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[](https://nodei.co/npm/tough-cookie/)
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[](https://travis-ci.org/salesforce/tough-cookie)
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# Synopsis
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``` javascript
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var tough = require('tough-cookie');
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var Cookie = tough.Cookie;
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var cookie = Cookie.parse(header);
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cookie.value = 'somethingdifferent';
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header = cookie.toString();
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var cookiejar = new tough.CookieJar();
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cookiejar.setCookie(cookie, 'http://currentdomain.example.com/path', cb);
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// ...
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cookiejar.getCookies('http://example.com/otherpath',function(err,cookies) {
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res.headers['cookie'] = cookies.join('; ');
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});
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```
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# Installation
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It's _so_ easy!
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`npm install tough-cookie`
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Why the name? NPM modules `cookie`, `cookies` and `cookiejar` were already taken.
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## Version Support
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Support for versions of node.js will follow that of the [request](https://www.npmjs.com/package/request) module.
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# API
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## tough
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Functions on the module you get from `require('tough-cookie')`. All can be used as pure functions and don't need to be "bound".
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**Note**: prior to 1.0.x, several of these functions took a `strict` parameter. This has since been removed from the API as it was no longer necessary.
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### `parseDate(string)`
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Parse a cookie date string into a `Date`. Parses according to RFC6265 Section 5.1.1, not `Date.parse()`.
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### `formatDate(date)`
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Format a Date into a RFC1123 string (the RFC6265-recommended format).
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### `canonicalDomain(str)`
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Transforms a domain-name into a canonical domain-name. The canonical domain-name is a trimmed, lowercased, stripped-of-leading-dot and optionally punycode-encoded domain-name (Section 5.1.2 of RFC6265). For the most part, this function is idempotent (can be run again on its output without ill effects).
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### `domainMatch(str,domStr[,canonicalize=true])`
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Answers "does this real domain match the domain in a cookie?". The `str` is the "current" domain-name and the `domStr` is the "cookie" domain-name. Matches according to RFC6265 Section 5.1.3, but it helps to think of it as a "suffix match".
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The `canonicalize` parameter will run the other two parameters through `canonicalDomain` or not.
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### `defaultPath(path)`
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Given a current request/response path, gives the Path apropriate for storing in a cookie. This is basically the "directory" of a "file" in the path, but is specified by Section 5.1.4 of the RFC.
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The `path` parameter MUST be _only_ the pathname part of a URI (i.e. excludes the hostname, query, fragment, etc.). This is the `.pathname` property of node's `uri.parse()` output.
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### `pathMatch(reqPath,cookiePath)`
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Answers "does the request-path path-match a given cookie-path?" as per RFC6265 Section 5.1.4. Returns a boolean.
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This is essentially a prefix-match where `cookiePath` is a prefix of `reqPath`.
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### `parse(cookieString[, options])`
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alias for `Cookie.parse(cookieString[, options])`
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### `fromJSON(string)`
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alias for `Cookie.fromJSON(string)`
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### `getPublicSuffix(hostname)`
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Returns the public suffix of this hostname. The public suffix is the shortest domain-name upon which a cookie can be set. Returns `null` if the hostname cannot have cookies set for it.
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For example: `www.example.com` and `www.subdomain.example.com` both have public suffix `example.com`.
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For further information, see http://publicsuffix.org/. This module derives its list from that site. This call is currently a wrapper around [`psl`](https://www.npmjs.com/package/psl)'s [get() method](https://www.npmjs.com/package/psl#pslgetdomain).
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### `cookieCompare(a,b)`
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For use with `.sort()`, sorts a list of cookies into the recommended order given in the RFC (Section 5.4 step 2). The sort algorithm is, in order of precedence:
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* Longest `.path`
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* oldest `.creation` (which has a 1ms precision, same as `Date`)
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* lowest `.creationIndex` (to get beyond the 1ms precision)
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``` javascript
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var cookies = [ /* unsorted array of Cookie objects */ ];
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cookies = cookies.sort(cookieCompare);
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```
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**Note**: Since JavaScript's `Date` is limited to a 1ms precision, cookies within the same milisecond are entirely possible. This is especially true when using the `now` option to `.setCookie()`. The `.creationIndex` property is a per-process global counter, assigned during construction with `new Cookie()`. This preserves the spirit of the RFC sorting: older cookies go first. This works great for `MemoryCookieStore`, since `Set-Cookie` headers are parsed in order, but may not be so great for distributed systems. Sophisticated `Store`s may wish to set this to some other _logical clock_ such that if cookies A and B are created in the same millisecond, but cookie A is created before cookie B, then `A.creationIndex < B.creationIndex`. If you want to alter the global counter, which you probably _shouldn't_ do, it's stored in `Cookie.cookiesCreated`.
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### `permuteDomain(domain)`
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Generates a list of all possible domains that `domainMatch()` the parameter. May be handy for implementing cookie stores.
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### `permutePath(path)`
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Generates a list of all possible paths that `pathMatch()` the parameter. May be handy for implementing cookie stores.
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## Cookie
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Exported via `tough.Cookie`.
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### `Cookie.parse(cookieString[, options])`
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Parses a single Cookie or Set-Cookie HTTP header into a `Cookie` object. Returns `undefined` if the string can't be parsed.
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The options parameter is not required and currently has only one property:
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* _loose_ - boolean - if `true` enable parsing of key-less cookies like `=abc` and `=`, which are not RFC-compliant.
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If options is not an object, it is ignored, which means you can use `Array#map` with it.
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Here's how to process the Set-Cookie header(s) on a node HTTP/HTTPS response:
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``` javascript
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if (res.headers['set-cookie'] instanceof Array)
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cookies = res.headers['set-cookie'].map(Cookie.parse);
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else
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cookies = [Cookie.parse(res.headers['set-cookie'])];
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```
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_Note:_ in version 2.3.3, tough-cookie limited the number of spaces before the `=` to 256 characters. This limitation has since been removed.
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See [Issue 92](https://github.com/salesforce/tough-cookie/issues/92)
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### Properties
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Cookie object properties:
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* _key_ - string - the name or key of the cookie (default "")
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* _value_ - string - the value of the cookie (default "")
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* _expires_ - `Date` - if set, the `Expires=` attribute of the cookie (defaults to the string `"Infinity"`). See `setExpires()`
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* _maxAge_ - seconds - if set, the `Max-Age=` attribute _in seconds_ of the cookie. May also be set to strings `"Infinity"` and `"-Infinity"` for non-expiry and immediate-expiry, respectively. See `setMaxAge()`
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* _domain_ - string - the `Domain=` attribute of the cookie
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* _path_ - string - the `Path=` of the cookie
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* _secure_ - boolean - the `Secure` cookie flag
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* _httpOnly_ - boolean - the `HttpOnly` cookie flag
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* _extensions_ - `Array` - any unrecognized cookie attributes as strings (even if equal-signs inside)
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* _creation_ - `Date` - when this cookie was constructed
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* _creationIndex_ - number - set at construction, used to provide greater sort precision (please see `cookieCompare(a,b)` for a full explanation)
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After a cookie has been passed through `CookieJar.setCookie()` it will have the following additional attributes:
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* _hostOnly_ - boolean - is this a host-only cookie (i.e. no Domain field was set, but was instead implied)
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* _pathIsDefault_ - boolean - if true, there was no Path field on the cookie and `defaultPath()` was used to derive one.
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* _creation_ - `Date` - **modified** from construction to when the cookie was added to the jar
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* _lastAccessed_ - `Date` - last time the cookie got accessed. Will affect cookie cleaning once implemented. Using `cookiejar.getCookies(...)` will update this attribute.
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### `Cookie([{properties}])`
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Receives an options object that can contain any of the above Cookie properties, uses the default for unspecified properties.
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### `.toString()`
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encode to a Set-Cookie header value. The Expires cookie field is set using `formatDate()`, but is omitted entirely if `.expires` is `Infinity`.
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### `.cookieString()`
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encode to a Cookie header value (i.e. the `.key` and `.value` properties joined with '=').
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### `.setExpires(String)`
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sets the expiry based on a date-string passed through `parseDate()`. If parseDate returns `null` (i.e. can't parse this date string), `.expires` is set to `"Infinity"` (a string) is set.
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### `.setMaxAge(number)`
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sets the maxAge in seconds. Coerces `-Infinity` to `"-Infinity"` and `Infinity` to `"Infinity"` so it JSON serializes correctly.
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### `.expiryTime([now=Date.now()])`
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### `.expiryDate([now=Date.now()])`
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expiryTime() Computes the absolute unix-epoch milliseconds that this cookie expires. expiryDate() works similarly, except it returns a `Date` object. Note that in both cases the `now` parameter should be milliseconds.
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Max-Age takes precedence over Expires (as per the RFC). The `.creation` attribute -- or, by default, the `now` parameter -- is used to offset the `.maxAge` attribute.
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If Expires (`.expires`) is set, that's returned.
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Otherwise, `expiryTime()` returns `Infinity` and `expiryDate()` returns a `Date` object for "Tue, 19 Jan 2038 03:14:07 GMT" (latest date that can be expressed by a 32-bit `time_t`; the common limit for most user-agents).
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### `.TTL([now=Date.now()])`
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compute the TTL relative to `now` (milliseconds). The same precedence rules as for `expiryTime`/`expiryDate` apply.
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The "number" `Infinity` is returned for cookies without an explicit expiry and `0` is returned if the cookie is expired. Otherwise a time-to-live in milliseconds is returned.
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### `.canonicalizedDomain()`
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### `.cdomain()`
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return the canonicalized `.domain` field. This is lower-cased and punycode (RFC3490) encoded if the domain has any non-ASCII characters.
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### `.toJSON()`
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For convenience in using `JSON.serialize(cookie)`. Returns a plain-old `Object` that can be JSON-serialized.
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Any `Date` properties (i.e., `.expires`, `.creation`, and `.lastAccessed`) are exported in ISO format (`.toISOString()`).
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**NOTE**: Custom `Cookie` properties will be discarded. In tough-cookie 1.x, since there was no `.toJSON` method explicitly defined, all enumerable properties were captured. If you want a property to be serialized, add the property name to the `Cookie.serializableProperties` Array.
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### `Cookie.fromJSON(strOrObj)`
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Does the reverse of `cookie.toJSON()`. If passed a string, will `JSON.parse()` that first.
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Any `Date` properties (i.e., `.expires`, `.creation`, and `.lastAccessed`) are parsed via `Date.parse()`, not the tough-cookie `parseDate`, since it's JavaScript/JSON-y timestamps being handled at this layer.
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Returns `null` upon JSON parsing error.
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### `.clone()`
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Does a deep clone of this cookie, exactly implemented as `Cookie.fromJSON(cookie.toJSON())`.
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### `.validate()`
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Status: *IN PROGRESS*. Works for a few things, but is by no means comprehensive.
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validates cookie attributes for semantic correctness. Useful for "lint" checking any Set-Cookie headers you generate. For now, it returns a boolean, but eventually could return a reason string -- you can future-proof with this construct:
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``` javascript
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if (cookie.validate() === true) {
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// it's tasty
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} else {
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// yuck!
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}
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```
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## CookieJar
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Exported via `tough.CookieJar`.
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### `CookieJar([store],[options])`
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Simply use `new CookieJar()`. If you'd like to use a custom store, pass that to the constructor otherwise a `MemoryCookieStore` will be created and used.
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The `options` object can be omitted and can have the following properties:
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* _rejectPublicSuffixes_ - boolean - default `true` - reject cookies with domains like "com" and "co.uk"
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* _looseMode_ - boolean - default `false` - accept malformed cookies like `bar` and `=bar`, which have an implied empty name.
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This is not in the standard, but is used sometimes on the web and is accepted by (most) browsers.
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Since eventually this module would like to support database/remote/etc. CookieJars, continuation passing style is used for CookieJar methods.
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### `.setCookie(cookieOrString, currentUrl, [{options},] cb(err,cookie))`
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Attempt to set the cookie in the cookie jar. If the operation fails, an error will be given to the callback `cb`, otherwise the cookie is passed through. The cookie will have updated `.creation`, `.lastAccessed` and `.hostOnly` properties.
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The `options` object can be omitted and can have the following properties:
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* _http_ - boolean - default `true` - indicates if this is an HTTP or non-HTTP API. Affects HttpOnly cookies.
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* _secure_ - boolean - autodetect from url - indicates if this is a "Secure" API. If the currentUrl starts with `https:` or `wss:` then this is defaulted to `true`, otherwise `false`.
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* _now_ - Date - default `new Date()` - what to use for the creation/access time of cookies
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* _ignoreError_ - boolean - default `false` - silently ignore things like parse errors and invalid domains. `Store` errors aren't ignored by this option.
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As per the RFC, the `.hostOnly` property is set if there was no "Domain=" parameter in the cookie string (or `.domain` was null on the Cookie object). The `.domain` property is set to the fully-qualified hostname of `currentUrl` in this case. Matching this cookie requires an exact hostname match (not a `domainMatch` as per usual).
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### `.setCookieSync(cookieOrString, currentUrl, [{options}])`
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Synchronous version of `setCookie`; only works with synchronous stores (e.g. the default `MemoryCookieStore`).
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### `.getCookies(currentUrl, [{options},] cb(err,cookies))`
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Retrieve the list of cookies that can be sent in a Cookie header for the current url.
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If an error is encountered, that's passed as `err` to the callback, otherwise an `Array` of `Cookie` objects is passed. The array is sorted with `cookieCompare()` unless the `{sort:false}` option is given.
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The `options` object can be omitted and can have the following properties:
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* _http_ - boolean - default `true` - indicates if this is an HTTP or non-HTTP API. Affects HttpOnly cookies.
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* _secure_ - boolean - autodetect from url - indicates if this is a "Secure" API. If the currentUrl starts with `https:` or `wss:` then this is defaulted to `true`, otherwise `false`.
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* _now_ - Date - default `new Date()` - what to use for the creation/access time of cookies
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* _expire_ - boolean - default `true` - perform expiry-time checking of cookies and asynchronously remove expired cookies from the store. Using `false` will return expired cookies and **not** remove them from the store (which is useful for replaying Set-Cookie headers, potentially).
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* _allPaths_ - boolean - default `false` - if `true`, do not scope cookies by path. The default uses RFC-compliant path scoping. **Note**: may not be supported by the underlying store (the default `MemoryCookieStore` supports it).
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The `.lastAccessed` property of the returned cookies will have been updated.
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### `.getCookiesSync(currentUrl, [{options}])`
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Synchronous version of `getCookies`; only works with synchronous stores (e.g. the default `MemoryCookieStore`).
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### `.getCookieString(...)`
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Accepts the same options as `.getCookies()` but passes a string suitable for a Cookie header rather than an array to the callback. Simply maps the `Cookie` array via `.cookieString()`.
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### `.getCookieStringSync(...)`
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Synchronous version of `getCookieString`; only works with synchronous stores (e.g. the default `MemoryCookieStore`).
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### `.getSetCookieStrings(...)`
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Returns an array of strings suitable for **Set-Cookie** headers. Accepts the same options as `.getCookies()`. Simply maps the cookie array via `.toString()`.
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### `.getSetCookieStringsSync(...)`
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Synchronous version of `getSetCookieStrings`; only works with synchronous stores (e.g. the default `MemoryCookieStore`).
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### `.serialize(cb(err,serializedObject))`
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Serialize the Jar if the underlying store supports `.getAllCookies`.
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**NOTE**: Custom `Cookie` properties will be discarded. If you want a property to be serialized, add the property name to the `Cookie.serializableProperties` Array.
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See [Serialization Format].
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### `.serializeSync()`
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Sync version of .serialize
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### `.toJSON()`
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Alias of .serializeSync() for the convenience of `JSON.stringify(cookiejar)`.
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### `CookieJar.deserialize(serialized, [store], cb(err,object))`
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A new Jar is created and the serialized Cookies are added to the underlying store. Each `Cookie` is added via `store.putCookie` in the order in which they appear in the serialization.
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The `store` argument is optional, but should be an instance of `Store`. By default, a new instance of `MemoryCookieStore` is created.
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As a convenience, if `serialized` is a string, it is passed through `JSON.parse` first. If that throws an error, this is passed to the callback.
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### `CookieJar.deserializeSync(serialized, [store])`
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Sync version of `.deserialize`. _Note_ that the `store` must be synchronous for this to work.
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### `CookieJar.fromJSON(string)`
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Alias of `.deserializeSync` to provide consistency with `Cookie.fromJSON()`.
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### `.clone([store,]cb(err,newJar))`
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Produces a deep clone of this jar. Modifications to the original won't affect the clone, and vice versa.
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The `store` argument is optional, but should be an instance of `Store`. By default, a new instance of `MemoryCookieStore` is created. Transferring between store types is supported so long as the source implements `.getAllCookies()` and the destination implements `.putCookie()`.
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### `.cloneSync([store])`
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Synchronous version of `.clone`, returning a new `CookieJar` instance.
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The `store` argument is optional, but must be a _synchronous_ `Store` instance if specified. If not passed, a new instance of `MemoryCookieStore` is used.
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The _source_ and _destination_ must both be synchronous `Store`s. If one or both stores are asynchronous, use `.clone` instead. Recall that `MemoryCookieStore` supports both synchronous and asynchronous API calls.
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### `.removeAllCookies(cb(err))`
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Removes all cookies from the jar.
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This is a new backwards-compatible feature of `tough-cookie` version 2.5, so not all Stores will implement it efficiently. For Stores that do not implement `removeAllCookies`, the fallback is to call `removeCookie` after `getAllCookies`. If `getAllCookies` fails or isn't implemented in the Store, that error is returned. If one or more of the `removeCookie` calls fail, only the first error is returned.
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### `.removeAllCookiesSync()`
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Sync version of `.removeAllCookies()`
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## Store
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Base class for CookieJar stores. Available as `tough.Store`.
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## Store API
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The storage model for each `CookieJar` instance can be replaced with a custom implementation. The default is `MemoryCookieStore` which can be found in the `lib/memstore.js` file. The API uses continuation-passing-style to allow for asynchronous stores.
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Stores should inherit from the base `Store` class, which is available as `require('tough-cookie').Store`.
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Stores are asynchronous by default, but if `store.synchronous` is set to `true`, then the `*Sync` methods on the of the containing `CookieJar` can be used (however, the continuation-passing style
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All `domain` parameters will have been normalized before calling.
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The Cookie store must have all of the following methods.
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### `store.findCookie(domain, path, key, cb(err,cookie))`
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Retrieve a cookie with the given domain, path and key (a.k.a. name). The RFC maintains that exactly one of these cookies should exist in a store. If the store is using versioning, this means that the latest/newest such cookie should be returned.
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Callback takes an error and the resulting `Cookie` object. If no cookie is found then `null` MUST be passed instead (i.e. not an error).
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### `store.findCookies(domain, path, cb(err,cookies))`
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Locates cookies matching the given domain and path. This is most often called in the context of `cookiejar.getCookies()` above.
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If no cookies are found, the callback MUST be passed an empty array.
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The resulting list will be checked for applicability to the current request according to the RFC (domain-match, path-match, http-only-flag, secure-flag, expiry, etc.), so it's OK to use an optimistic search algorithm when implementing this method. However, the search algorithm used SHOULD try to find cookies that `domainMatch()` the domain and `pathMatch()` the path in order to limit the amount of checking that needs to be done.
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As of version 0.9.12, the `allPaths` option to `cookiejar.getCookies()` above will cause the path here to be `null`. If the path is `null`, path-matching MUST NOT be performed (i.e. domain-matching only).
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### `store.putCookie(cookie, cb(err))`
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Adds a new cookie to the store. The implementation SHOULD replace any existing cookie with the same `.domain`, `.path`, and `.key` properties -- depending on the nature of the implementation, it's possible that between the call to `fetchCookie` and `putCookie` that a duplicate `putCookie` can occur.
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|
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|
The `cookie` object MUST NOT be modified; the caller will have already updated the `.creation` and `.lastAccessed` properties.
|
|
|
|
Pass an error if the cookie cannot be stored.
|
|
|
|
### `store.updateCookie(oldCookie, newCookie, cb(err))`
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|
|
|
Update an existing cookie. The implementation MUST update the `.value` for a cookie with the same `domain`, `.path` and `.key`. The implementation SHOULD check that the old value in the store is equivalent to `oldCookie` - how the conflict is resolved is up to the store.
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|
|
|
The `.lastAccessed` property will always be different between the two objects (to the precision possible via JavaScript's clock). Both `.creation` and `.creationIndex` are guaranteed to be the same. Stores MAY ignore or defer the `.lastAccessed` change at the cost of affecting how cookies are selected for automatic deletion (e.g., least-recently-used, which is up to the store to implement).
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|
|
|
Stores may wish to optimize changing the `.value` of the cookie in the store versus storing a new cookie. If the implementation doesn't define this method a stub that calls `putCookie(newCookie,cb)` will be added to the store object.
|
|
|
|
The `newCookie` and `oldCookie` objects MUST NOT be modified.
|
|
|
|
Pass an error if the newCookie cannot be stored.
|
|
|
|
### `store.removeCookie(domain, path, key, cb(err))`
|
|
|
|
Remove a cookie from the store (see notes on `findCookie` about the uniqueness constraint).
|
|
|
|
The implementation MUST NOT pass an error if the cookie doesn't exist; only pass an error due to the failure to remove an existing cookie.
|
|
|
|
### `store.removeCookies(domain, path, cb(err))`
|
|
|
|
Removes matching cookies from the store. The `path` parameter is optional, and if missing means all paths in a domain should be removed.
|
|
|
|
Pass an error ONLY if removing any existing cookies failed.
|
|
|
|
### `store.removeAllCookies(cb(err))`
|
|
|
|
_Optional_. Removes all cookies from the store.
|
|
|
|
Pass an error if one or more cookies can't be removed.
|
|
|
|
**Note**: New method as of `tough-cookie` version 2.5, so not all Stores will implement this, plus some stores may choose not to implement this.
|
|
|
|
### `store.getAllCookies(cb(err, cookies))`
|
|
|
|
_Optional_. Produces an `Array` of all cookies during `jar.serialize()`. The items in the array can be true `Cookie` objects or generic `Object`s with the [Serialization Format] data structure.
|
|
|
|
Cookies SHOULD be returned in creation order to preserve sorting via `compareCookies()`. For reference, `MemoryCookieStore` will sort by `.creationIndex` since it uses true `Cookie` objects internally. If you don't return the cookies in creation order, they'll still be sorted by creation time, but this only has a precision of 1ms. See `compareCookies` for more detail.
|
|
|
|
Pass an error if retrieval fails.
|
|
|
|
**Note**: not all Stores can implement this due to technical limitations, so it is optional.
|
|
|
|
## MemoryCookieStore
|
|
|
|
Inherits from `Store`.
|
|
|
|
A just-in-memory CookieJar synchronous store implementation, used by default. Despite being a synchronous implementation, it's usable with both the synchronous and asynchronous forms of the `CookieJar` API. Supports serialization, `getAllCookies`, and `removeAllCookies`.
|
|
|
|
## Community Cookie Stores
|
|
|
|
These are some Store implementations authored and maintained by the community. They aren't official and we don't vouch for them but you may be interested to have a look:
|
|
|
|
- [`db-cookie-store`](https://github.com/JSBizon/db-cookie-store): SQL including SQLite-based databases
|
|
- [`file-cookie-store`](https://github.com/JSBizon/file-cookie-store): Netscape cookie file format on disk
|
|
- [`redis-cookie-store`](https://github.com/benkroeger/redis-cookie-store): Redis
|
|
- [`tough-cookie-filestore`](https://github.com/mitsuru/tough-cookie-filestore): JSON on disk
|
|
- [`tough-cookie-web-storage-store`](https://github.com/exponentjs/tough-cookie-web-storage-store): DOM localStorage and sessionStorage
|
|
|
|
|
|
# Serialization Format
|
|
|
|
**NOTE**: if you want to have custom `Cookie` properties serialized, add the property name to `Cookie.serializableProperties`.
|
|
|
|
```js
|
|
{
|
|
// The version of tough-cookie that serialized this jar.
|
|
version: 'tough-cookie@1.x.y',
|
|
|
|
// add the store type, to make humans happy:
|
|
storeType: 'MemoryCookieStore',
|
|
|
|
// CookieJar configuration:
|
|
rejectPublicSuffixes: true,
|
|
// ... future items go here
|
|
|
|
// Gets filled from jar.store.getAllCookies():
|
|
cookies: [
|
|
{
|
|
key: 'string',
|
|
value: 'string',
|
|
// ...
|
|
/* other Cookie.serializableProperties go here */
|
|
}
|
|
]
|
|
}
|
|
```
|
|
|
|
# Copyright and License
|
|
|
|
BSD-3-Clause:
|
|
|
|
```text
|
|
Copyright (c) 2015, Salesforce.com, Inc.
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
1. Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
|
|
2. Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
|
|
3. Neither the name of Salesforce.com nor the names of its contributors may
|
|
be used to endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
```
|