LGTM2

On Wed, Jan 3, 2024 at 8:40 AM Mike Taylor <miketa...@chromium.org> wrote:

> LGTM1
> On 1/2/24 11:42 AM, Nicolás Peña wrote:
>
> Brief update: both spec PRs are now merged. Hoping to ship in M122.
>
> On Friday, December 15, 2023 at 2:29:58 PM UTC-5 Nicolás Peña wrote:
>
>> Contact emails
>>
>> n...@chromium.org
>>
>> Explainer
>>
>> Domain Hint (formerly hosted domain):
>> https://github.com/fedidcg/FedCM/issues/427
>>
>> Disconnect (formerly revoke): https://github.com/fedidcg/FedCM/issues/496
>>
>> (Note: in the FedCM team, we have explainers in the form of GitHub issues
>> per feedback
>> <https://github.com/fedidcg/FedCM/issues/431#issuecomment-1425025469>
>> from FedID CG. The issue and the first comment are the explainers in each
>> case.)
>>
>> Specification
>>
>> Domain Hint: https://github.com/fedidcg/FedCM/pull/512
>>
>> Disconnect:
>> https://fedidcg.github.io/FedCM/#browser-api-identity-credential-disconnect
>>
>>
>> Note on spec PR merging policy (to answer the question “why has the first
>> not been merged”): in the FedID CG, we have agreed that non-editorial spec
>> PRs require review from two implementations. Disconnect has been approved,
>> while domainHint is still under review. Both features have been discussed
>> thoroughly in the FedID CG and the feedback there has been incorporated.
>>
>> Summary
>>
>> Allows showing only accounts matching a given domain hint in the FedCM
>> account chooser, and allows disconnecting a federated login account via the
>> relying party website. With domain hint, developers may provide a better UX
>> by only showing the federated login accounts from the domain that they
>> accept. With the disconnect API, a relying party (RP) may notify the
>> identity provider (IdP) that an IdP account previously used via FedCM in an
>> RP is now disconnected, and hence using that account again via federated
>> login would require treating it as a new account.
>>
>> Blink component
>>
>> Blink>Identity>FedCM
>> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EIdentity%3EFedCM>
>>
>> TAG review
>>
>> https://github.com/w3ctag/design-reviews/issues/893
>>
>> TAG review status
>>
>> Issues addressed
>>
>> Risks
>>
>> Interoperability and Compatibility
>>
>> These are small additions to the FedCM API, which has (general) support
>> from WebKit and Mozilla. They haven't shipped FedCM yet, but it would not
>> be a lot more work to add these features. If a user agent did not have
>> domain hint support, this would mean it would show more accounts in the
>> chooser compared to user agents which do have domain hint support. Not
>> adding disconnect would mean that this feature of allowing RPs to
>> disconnect accounts would not be available in the browser, but it would not
>> impact the FedCM API otherwise.
>>
>>
>> Gecko: Positive for disconnect and no signal yet for domainHint. Firefox
>> asked us to not send standards positions requests for small FedCM
>> additions, and to instead rely on pull requests. See
>> https://github.com/fedidcg/FedCM/pull/512 and
>> https://github.com/fedidcg/FedCM/pull/515.
>>
>> WebKit: No signal (
>> https://github.com/WebKit/standards-positions/issues/249)
>>
>> Web developers: Positive. This is a feature requested by developers to
>> satisfy existing flows which break once third-party cookies are removed.
>>
>> Other signals:
>>
>> Ergonomics
>>
>> It will be often used within the FedCM API. We do not see ergonomics
>> risks.
>>
>>
>> Activation
>>
>> Domain hint can be polyfilled via login hint but it would be pretty
>> cumbersome to do so. The disconnect API would be hard to polyfill, but
>> could perhaps be done in a non-user friendly way via popups. This would
>> still be imperfect since the browser knowledge about the connection would
>> not be cleared, only the IdP-side disconnection would occur.
>>
>>
>> Security
>>
>> The Disconnect endpoint will use CORS. An RP may not impact the
>> connection status of accounts not belonging to that RP origin.
>>
>>
>> WebView application risks
>>
>> Does this intent deprecate or change behavior of existing APIs, such that
>> it has potentially high risk for Android WebView-based applications?
>>
>> N/A (FedCM does not work on WebViews)
>>
>>
>> Debuggability
>>
>> Console errors and DevTools issues will be used to highlight any issues
>> with the disconnect call.
>>
>>
>> Will this feature be supported on all six Blink platforms (Windows, Mac,
>> Linux, Chrome OS, Android, and Android WebView)?
>>
>> FedCM is not supported on Android WebView.
>>
>>
>> Is this feature fully tested by web-platform-tests
>> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
>> ?
>>
>> Yes. Look for domainhint and disconnect in
>> https://wpt.fyi/results/credential-management?label=experimental&label=master&aligned
>> .
>>
>>
>> Flag name on chrome://flags
>>
>> FedCmDomainHint, FedCmDisconnect
>>
>> Finch feature name
>>
>> FedCmDomainHint, FedCmDisconnect
>>
>> Requires code in //chrome?
>>
>> True
>>
>> Tracking bug
>>
>> https://bugs.chromium.org/p/chromium/issues/detail?id=1473135 (follow
>> implementations in the two BlockedOn bugs)
>>
>> Launch bug
>>
>> https://launch.corp.google.com/launch/4273848
>>
>> Estimated milestones
>>
>> No milestones specified
>>
>>
>> Anticipated spec changes
>>
>> Open questions about a feature may be a source of future web compat or
>> interop issues. Please list open issues (e.g. links to known github issues
>> in the project for the feature specification) whose resolution may
>> introduce web compat/interop risk (e.g., changing to naming or structure of
>> the API in a non-backward-compatible way).
>>
>> None
>>
>> Link to entry on the Chrome Platform Status
>>
>> https://chromestatus.com/feature/5202286040580096
>>
>> This intent message was generated by Chrome Platform Status
>> <https://chromestatus.com/>.
>>
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