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🔒⚗️ Add experimental SASL::ClientAdapter #183

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merged 2 commits into from
Oct 9, 2023

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@nevans nevans commented Sep 26, 2023

This adds some complexity over the IMAP implementation, but it simplifies sharing the implementation between net-imap, net-smtp, and hopefully many others in the future.

SASL.initial_response? and SASL.done? have been removed without deprecation (they haven't been in any release yet). The logic has been moved into SASL::ClientAdapter. Done in #184.

#initial_response? was added to the deprecated authenticators. It isn't required that authenticators implement this method, but it simplifies the tests, now that SASL.initial_response? is gone. Done in #184.

This PR has been updated to only create the SASL::ClientAdapter. Actually using it has been pushed off until a later PR: #194.

@nevans nevans added the SASL 🔒 Authentication and authentication mechanisms label Sep 26, 2023
@nevans nevans requested review from hsbt and shugo September 26, 2023 15:25
@nevans nevans force-pushed the sasl/abstract-protocol branch 9 times, most recently from 4af88b3 to 5a72913 Compare October 4, 2023 13:53
@nevans nevans force-pushed the sasl/abstract-protocol branch 2 times, most recently from 6fc2d1e to 60651db Compare October 9, 2023 20:31
_The API is **experimental.**_

TODO: catch exceptions in #process and send #cancel_string.
TODO: raise an error if the command succeeds after being canceled.
TODO: use with more clients, to verify the API can accommodate them.

An abstract base class for executing a SASL authentication exchange for
a client.  Subclasses works as an adapter for a protocol and a client
implementation of that protocol.

Call `#authenticate` to execute an authentication exchange for `#client`
using `#authenticator`.  Authentication failures will raise an
exception.  Any exceptions other than those in RESPONSE_ERRORs will also
drop the connection.

Methods for subclasses to override are all documented as `protected`.
At the very least, subclasses must provide an override (or a block) for
`#send_command_with_continuations`.  Client-specific overrides may also
be needed for `RESPONSE_ERRORS`, `#supports_initial_response?`,
`#supports_mechanism?`, `#handle_incomplete`, or `#drop_connection`.
@nevans nevans force-pushed the sasl/abstract-protocol branch 2 times, most recently from 2a55ec3 to 51b12d6 Compare October 9, 2023 20:42
@nevans nevans marked this pull request as ready for review October 9, 2023 20:44
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nevans commented Oct 9, 2023

This PR has been updated to only create the SASL::ClientAdapter. Actually using it has been pushed off until later (#194). So I see this PR as very low risk.

On the other hand, I have been using this code from other projects and I would like to submit PRs to some of them. And that will be greatly simplified once it is in a released gem.

@nevans nevans merged commit ba08aa9 into ruby:master Oct 9, 2023
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@nevans nevans deleted the sasl/abstract-protocol branch October 10, 2023 03:20
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