Create Proposal: add cookies.removeAll() method.md

Initial draft

proposals/Proposal: add cookies.removeAll() method.md

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+**Summary**
+
+Adds a new API `cookies.removeAll()` to allow for the removal of multiple cookies with a single call.
+
+**Document Metadata**
+
+**Author:**  [aselya](https://github.com/aselya)
+
+**Sponsoring Browser:**  Chrome
+
+**Contributors:**  
+
+**Created:**  2024-09-18
+
+**Related Issues:**  [PrivacyCG/CHIPS issue 6 - How do Partitioned cookies interact with browser extensions?](https://github.com/privacycg/CHIPS/issues/6)
+
+## Motivation
+
+Prior to the introduction of [partitioned cookies](https://github.com/privacycg/CHIPS), the required parameters (`url` and `name`) used by the existing `cookies.remove()` api would be unique to a single cookie. The inclusion of an optional `partitionKey` means that there can be more than one cookie that matches the currently required parameters for `cookies.remove()`. Because of this, handling partitioned cookies with `cookies.remove()` requires additional steps which can be simplified by the inclusion of this new API.
+
+### Objective
+
+This new API addresses two workflows for developers:
+##### Removal of cookies with the same url and name combination but different partitionKey values:
+Since the introduction of partitioned cookies, to remove all the cookies with the same `url` and `name` a developer must first call `cookies.getAll()` to get all of the partitioned and unpartitioned cookies associated with the values. Then use the results of that call to make individual calls to `cookies.remove()` to delete each cookie. 
+
+##### Removal of cookies associated with a topLevelSite:
+To remove all the cookies associated with a `topLevelSite`, a developer must first call `cookies.getAll({})` to retrieve all partitioned and unpartitioned cookies. Then filter the results to identify  cookies that have a value for `topLevelSite` of their `partitionKey` match the desired `topLevelSite`. Finally the developer will need to make individual calls to `cookies.remove()` to delete each cookie. 
+
+#### Use Cases
+
+##### Cookie Manager:
+
+Let's say a cookie manager extension (with host permissions) is used by users to remove their cookies. Using `cookies.removeAll()` would ensure that the cookie manager extension is removing all the cookies associated with a `topLevelSite` correctly. Instead of relying on the developer of the extension to make a call to `cookies.getAll()` followed by call(s) to `cookies.remove()`. Reducing complexity for the developers while improving performance of the extension.
+
+### Known Consumers
+
+All extensions that access and/or modify cookies with awareness of partitioned cookies, through the use of the `partitionKey`  property  in  the  `cookies` extension API.
+
+## Specification
+
+
+### Schema
+
+##### Syntax
+
+```
+let removed = await browser.cookies.removeAll(
+details // object
+)
+```
+##### Parameters
+An `object` containing information to identify the cookie(s) to remove. It contains the following properties:
+
+>[`name`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies/remove#name) optional:
+>
+>A  `string`  representing the name of the cookie to remove.
+>
+>[`partitionKey`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies/remove#partitionkey)  optional:
+>
+>An object representing the storage partition containing the cookie.
+>
+>[`topLevelSite`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies/remove#toplevelsite)  optional:
+>
+>A  `string`  representing the first-party URL of the top-level site storage partition containing the cookie.
+>
+>[`storeId`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies/remove#storeid)  optional:
+>
+>A  `string`  representing the ID of the cookie store to find the cookie in. If unspecified, the cookie is looked for by default in the current execution context's cookie store.
+>
+>[`url`](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/cookies/remove#url) optional:
+>
+>A  `string`  representing the URL associated with the cookie.
+
+### Behavior
+
+The API will remove all cookies that match the `details` object parameter with the exception of the cases outlined in the implementation details.
+If the extension does not have  [host permissions](https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions#host_permissions)  for this URL, the API call will fail.
+
+### New Permissions
+No  new  permissions  are  required.
+
+### Manifest File Changes
+No new manifest fields are required.
+
+## Security and Privacy
+Incorrect usage can lead to the removal of cookies that are not intended.
+
+### Exposed Sensitive Data
+None
+
+### Abuse Mitigations
+To remove a cookie, the extension must have host permissions for the `url` associated with the cookie.
+
+
+## Alternatives
+None
+
+### Existing Workarounds
+
+The behavior introduced by this API can be replicated by using a combination of `cookies.getAll()` and `cookies.remove()`.
+
+### Open Web API
+
+The cookies API is specific to extensions
+
+## Implementation Notes
+
+Host permissions are required for this API.
+#### Special cases:
+```cookies.removeAll({})```
+
+>An empty details object will result in all cookies being removed. 
+
+```
+cookies.removeAll({
+    partitionKey:{}})
+```
+
+>An empty `partitionKey` object as the only value in the details object, will result in all partitioned cookies being removed.
+
+```
+cookies.removeAll({
+    name: “example”,
+    url: “https://example.com”,
+    partitionKey:{}
+})
+```
+
+>An empty `partitionKey` object with other values populated, will result in both unpartitioned and partitioned cookies that also match the other values provided will be removed.
+
+```
+cookies.removeAll({
+    topLevelSite: “https://example.com”
+})
+```
+
+>If `topLevelSite` is the only argument, it will result in all cookies that have that value as the `topLevelSite` in their `partitionKey` being removed.
+
+```
+cookies.removeAll({
+    topLevelSite: “https://example.com”,
+    partitionKey:{topLevelSite: “https://foo.com”}
+})
+```
+
+>If the `topLevelSite` differs from the `topLevelSite`, if present, in the `partitionKey` an error will be returned.