Document getPublicSuffix

api/.gitignore

@@ -3,3 +3,5 @@ docs/*.md
 
 # subsequent PRs will un-ignore areas that are under review until
 # all docs are complete and we can drop this ignore file entirely
+!docs/tough-cookie.getpublicsuffix.md
+!docs/tough-cookie.getpublicsuffixoptions.md

api/docs/tough-cookie.getpublicsuffix.md

@@ -0,0 +1,37 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [tough-cookie](./tough-cookie.md) &gt; [getPublicSuffix](./tough-cookie.getpublicsuffix.md)
+
+## getPublicSuffix() function
+
+Returns the public suffix of this hostname. The public suffix is the shortest domain name upon which a cookie can be set.
+
+**Signature:**
+
+```typescript
+export declare function getPublicSuffix(domain: string, options?: GetPublicSuffixOptions): string | null;
+```
+
+## Parameters
+
+|  Parameter | Type | Description |
+|  --- | --- | --- |
+|  domain | string | the domain attribute of a cookie |
+|  options | [GetPublicSuffixOptions](./tough-cookie.getpublicsuffixoptions.md) | _(Optional)_ optional configuration for controlling how the public suffix is determined |
+
+**Returns:**
+
+string \| null
+
+## Remarks
+
+A "public suffix" is a domain that is controlled by a public registry, such as "com", "co.uk", and "pvt.k12.wy.us". This step is essential for preventing attacker.com from disrupting the integrity of example.com by setting a cookie with a Domain attribute of "com". Unfortunately, the set of public suffixes (also known as "registry controlled domains") changes over time. If feasible, user agents SHOULD use an up-to-date public suffix list, such as the one maintained by the Mozilla project at http://publicsuffix.org/. (See [RFC6265 - Section 5.3](https://www.rfc-editor.org/rfc/rfc6265.html#section-5.3)<!-- -->)
+
+## Example
+
+
+```
+getPublicSuffix('www.example.com') === 'example.com'
+getPublicSuffix('www.subdomain.example.com') === 'example.com'
+```
+

api/docs/tough-cookie.getpublicsuffixoptions.md

@@ -0,0 +1,16 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [tough-cookie](./tough-cookie.md) &gt; [GetPublicSuffixOptions](./tough-cookie.getpublicsuffixoptions.md)
+
+## GetPublicSuffixOptions type
+
+Options for configuring how [getPublicSuffix()](./tough-cookie.getpublicsuffix.md) behaves.
+
+**Signature:**
+
+```typescript
+export type GetPublicSuffixOptions = {
+    allowSpecialUseDomain?: boolean | undefined;
+    ignoreError?: boolean | undefined;
+};
+```

api/tough-cookie.api.md

@@ -209,11 +209,15 @@ export function formatDate(date: Date): string;
 // @public (undocumented)
 export const fromJSON: (str: unknown) => Cookie | null;
 
-// Warning: (ae-forgotten-export) The symbol "GetPublicSuffixOptions" needs to be exported by the entry point index.d.ts
-//
-// @public (undocumented)
+// @public
 export function getPublicSuffix(domain: string, options?: GetPublicSuffixOptions): string | null;
 
+// @public
+export type GetPublicSuffixOptions = {
+    allowSpecialUseDomain?: boolean | undefined;
+    ignoreError?: boolean | undefined;
+};
+
 // @public (undocumented)
 export class MemoryCookieStore extends Store {
     constructor();

lib/cookie/index.ts

@@ -1,7 +1,7 @@
 export { MemoryCookieStore } from '../memstore'
 export { pathMatch } from '../pathMatch'
 export { permuteDomain } from '../permuteDomain'
-export { getPublicSuffix } from '../getPublicSuffix'
+export { getPublicSuffix, GetPublicSuffixOptions } from '../getPublicSuffix'
 export { Store } from '../store'
 export { ParameterError } from '../validators'
 export { version } from '../version'

lib/getPublicSuffix.ts

@@ -1,43 +1,35 @@
-/*!
- * Copyright (c) 2018, 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.
- */
-'use strict'
 import { getDomain } from 'tldts'
 
 // RFC 6761
 const SPECIAL_USE_DOMAINS = ['local', 'example', 'invalid', 'localhost', 'test']
 
 const SPECIAL_TREATMENT_DOMAINS = ['localhost', 'invalid']
 
-type GetPublicSuffixOptions = {
+/**
+ * Options for configuring how {@link getPublicSuffix} behaves.
+ * @public
+ */
+export type GetPublicSuffixOptions = {
+  /**
+   * Should the following {@link https://www.rfc-editor.org/rfc/rfc6761.html | Special Use Domains} be treated as if they were valid public suffixes ('local', 'example', 'invalid', 'localhost', 'test')
+   *
+   * @remarks
+   * In testing scenarios it's common to configure the cookies store with:
+   * ```json
+   * {
+   *   allowSpecialUseDomain: true,
+   *   rejectPublicSuffixes: false
+   * }
+   * ```
+   *
+   * @defaultValue false
+   */
   allowSpecialUseDomain?: boolean | undefined
+  /**
+   * Should an invalid public domains error be ignored
+   *
+   * @defaultValue false
+   */
   ignoreError?: boolean | undefined
 }
 
@@ -46,6 +38,32 @@ const defaultGetPublicSuffixOptions: GetPublicSuffixOptions = {
   ignoreError: false,
 }
 
+/**
+ * Returns the public suffix of this hostname. The public suffix is the shortest domain
+ * name upon which a cookie can be set.
+ *
+ * @remarks
+ * A "public suffix" is a domain that is controlled by a
+ * public registry, such as "com", "co.uk", and "pvt.k12.wy.us".
+ * This step is essential for preventing attacker.com from
+ * disrupting the integrity of example.com by setting a cookie
+ * with a Domain attribute of "com".  Unfortunately, the set of
+ * public suffixes (also known as "registry controlled domains")
+ * changes over time.  If feasible, user agents SHOULD use an
+ * up-to-date public suffix list, such as the one maintained by
+ * the Mozilla project at http://publicsuffix.org/.
+ * (See {@link https://www.rfc-editor.org/rfc/rfc6265.html#section-5.3 | RFC6265 - Section 5.3})
+ *
+ * @example
+ * ```
+ * getPublicSuffix('www.example.com') === 'example.com'
+ * getPublicSuffix('www.subdomain.example.com') === 'example.com'
+ * ```
+ *
+ * @param domain - the domain attribute of a cookie
+ * @param options - optional configuration for controlling how the public suffix is determined
+ * @public
+ */
 export function getPublicSuffix(
   domain: string,
   options: GetPublicSuffixOptions = {},
@@ -80,7 +98,7 @@ export function getPublicSuffix(
     SPECIAL_USE_DOMAINS.includes(topLevelDomain)
   ) {
     throw new Error(
-      `Cookie has domain set to the public suffix "${topLevelDomain}" which is a special use domain. To allow this, configure your CookieJar with {allowSpecialUseDomain:true, rejectPublicSuffixes: false}.`,
+      `Cookie has domain set to the public suffix "${topLevelDomain}" which is a special use domain. To allow this, configure your CookieJar with {allowSpecialUseDomain: true, rejectPublicSuffixes: false}.`,
     )
   }