feat(auth): allow consuming access tokens directly by alvarowolfx · Pull Request #3642 · googleapis/google-cloud-rust

alvarowolfx · 2025-10-29T16:07:49Z

alvarowolfx · 2025-10-29T16:10:44Z

This is a WIP and is missing all documentation for the new interface.

Pros:

AccessTokenCredentials is compatible with Credentials type (via automatic conversion to CredentialProvider -> Credentials)
Reuse all current Builders and can selective pick which Credentials types would support that (we don't want API Key creds to support this)
Cons:
I don't like the build_access_token_credentials() method name. Too long and not sure if is a good pattern to add another final branch to a Builder.
Introduces new AccessTokenCredentials which is almost the same as Credentials. Perhaps it can be simplified ?
AccessTokenCredentialsProvider looks really similar to TokenProvider, can this be reused ?
- Probably not, Token is private and we need a new AccessToken type to expose that.

codecov · 2025-10-29T16:15:39Z

Codecov Report

❌ Patch coverage is 98.18182% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 95.03%. Comparing base (3388d78) to head (67e9d89).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/auth/src/credentials.rs	95.45%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3642   +/-   ##
=======================================
  Coverage   95.02%   95.03%           
=======================================
  Files         161      161           
  Lines        6049     6097   +48     
=======================================
+ Hits         5748     5794   +46     
- Misses        301      303    +2

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coryan · 2025-10-29T16:25:41Z

I don't know what is the exact level of test coverage we want, but 46% is too low.

alvarowolfx · 2025-10-29T16:26:23Z

I don't know what is the exact level of test coverage we want, but 46% is too low.

this is also missing tests, is just a draft for the public API.

dbolduc

FWIW, this approach makes a lot of sense to me. It is lamentable that we are already making backwards compatibility sacrifices in version 1.1.0 of a library, but that is where we are.

I think I messed up by making Credentials an opaque object instead of a trait. I think at the time I was afraid of all the generics that entailed... but now I realize that is just what flexible Rust looks like.

…ss_token

coryan · 2025-11-20T22:26:06Z

Marking as draft. If / when it is ready for review please let us know.

alvarowolfx · 2025-11-21T13:40:46Z

Marking as draft. If / when it is ready for review please let us know.

@coryan it was ready to review, but I think I'll split into smaller PRs to make it easier to review. Unless you think this is in a reasonable size.

coryan · 2025-11-21T13:56:23Z

@dbolduc can you take another look?

dbolduc

The code looks really good, and I would symbolically approve the PR. I think my comments are mostly grammar nits.

I need an explicit answer on why we are abandoning Extensions / CacheableResource for the AccessToken before I can approve though.

dbolduc · 2025-11-21T21:01:59Z

+        Ok(self.build_access_token_credentials()?.into())
+    }
+
+    /// Returns a [Credentials] instance with the configured settings.


nit: s/Credentials/AccessTokenCredentials/

dbolduc · 2025-11-21T21:03:19Z

+    ///
+    /// # Errors
+    ///
+    /// Returns a [CredentialsError] if a unsupported credential type is provided


nit: s/a unsupported/an unsupported/

dbolduc · 2025-11-21T21:04:30Z

+    /// Returns a [CredentialsError] if a unsupported credential type is provided
+    /// or if the JSON value is either malformed
+    /// or missing required fields. For more information, on how to generate
+    /// json, consult the relevant section in the [application-default credentials] guide.


nit: s/json/the JSON for a credential/ ?

dbolduc · 2025-11-21T21:05:33Z

+        Ok(self.build_access_token_credentials()?.into())
+    }
+
+    /// Returns a [AccessTokenCredentials] instance with the configured settings.


nit: s/Returns a/Returns an/

dbolduc · 2025-11-21T21:07:33Z

+    /// Returns a [BuilderError] if the `external_account_config`
+    /// provided to [`Builder::new`] cannot be successfully deserialized into the
+    /// expected format for an external account configuration. This typically happens if the
+    /// JSON value is malformed or missing required fields. For more information,
+    /// on the expected format, consult the relevant section in the
+    /// [external_account_credentials] guide.


nit: reflow?

we do not have any sort of tool. I just manully cut lines off at or before 80 characters. 🤷

Also consider a paragraph break before "For more information..."

dbolduc · 2025-11-21T21:07:51Z

+    ///
+    /// Returns a [CredentialsError] if a unsupported credential type is provided
+    /// or if the JSON value is either malformed
+    /// or missing required fields. For more information, on how to generate


optional nit: paragraph break before "For more information..."

alvarowolfx · 2025-11-25T17:07:48Z

The code looks really good, and I would symbolically approve the PR. I think my comments are mostly grammar nits.

I need an explicit answer on why we are abandoning Extensions / CacheableResource for the AccessToken before I can approve though.

pushed some updates addressing the nits in the docs and also made some improvements so customers can mock the new trait

feat(auth): allow consuming access tokens directly

2d73fcb

dbolduc reviewed Oct 30, 2025

View reviewed changes

Comment thread src/auth/src/credentials.rs Resolved

Comment thread tests/integration-auth/src/lib.rs Resolved

Comment thread src/auth/src/credentials.rs Resolved

Comment thread src/auth/src/credentials.rs Resolved

alvarowolfx added 5 commits November 11, 2025 01:51

docs: add docs and test to access token credentials

d2c1def

Merge branch 'main' into feat-auth-acess-token-direct

f717475

docs: add comments about compatibility with Credentials

2bbfe31

fix: lint issues

44fdb14

fix: fmt all the things

6f3dd99

alvarowolfx marked this pull request as ready for review November 11, 2025 19:49

alvarowolfx requested review from a team November 11, 2025 19:49

alvarowolfx marked this pull request as draft November 11, 2025 20:10

alvarowolfx added 3 commits November 17, 2025 16:39

refactor: change token method name and remove unused fields from acce…

180ddf4

…ss_token

Merge branch 'main' into feat-auth-acess-token-direct

907514d

fix: remove todo from integration tests

065040a

alvarowolfx marked this pull request as ready for review November 17, 2025 16:43

alvarowolfx added 3 commits November 17, 2025 16:58

fix: hide token string from debug

cca14b1

test: censored access token

d1473cb

test: add tests using access token creds

8a98c06

coryan marked this pull request as draft November 20, 2025 22:26

coryan marked this pull request as ready for review November 21, 2025 13:56

dbolduc reviewed Nov 21, 2025

View reviewed changes

fix: address review comments

ebe2023

alvarowolfx added 2 commits November 25, 2025 17:07

Merge branch 'main' into feat-auth-acess-token-direct

c0a2ecf

fix: add import for tokio Instant

67e9d89

dbolduc approved these changes Nov 25, 2025

View reviewed changes

alvarowolfx merged commit 37aef82 into googleapis:main Nov 25, 2025
29 checks passed

alvarowolfx mentioned this pull request Dec 10, 2025

Add simpler credentials header accessor #3362

Closed

bwplotka mentioned this pull request Nov 6, 2026

feat(auth): expose expires_at on AccessToken #7391

Closed

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alvarowolfx commented Oct 29, 2025 •

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