In 80673b4a4 (https://go.dev/cl/157820) I added a never-shrinking
package-global cache to remember which auto-detected auth style (HTTP
headers vs POST) was supported by a certain OAuth2 server, keyed by
its URL.
Unfortunately, some multi-tenant SaaS OIDC servers behave poorly and
have one global OpenID configuration document for all of their
customers which says ("we support all auth styles! you pick!") but
then give each customer control of which style they specifically
accept. This is bogus behavior on their part, but the oauth2 package's
global caching per URL isn't helping. (It's also bad to have a
package-global cache that can never be GC'ed)
So, this change moves the cache to hang off the oauth *Configs
instead. Unfortunately, it does so with some backwards compatiblity
compromises (an atomic.Value hack), lest people are using old versions
of Go still or copying a Config by value, both of which this package
previously accidentally supported, even though they weren't tested.
This change also means that anybody that's repeatedly making ephemeral
oauth.Configs without an explicit auth style will be losing &
reinitializing their cache on any auth style failures + fallbacks to
the other style. I think that should be pretty rare. People seem to
make an oauth2.Config once earlier and stash it away somewhere (often
deep in a token fetcher or HTTP client/transport).
Change-Id: I91f107368ab3c3d77bc425eeef65372a589feb7b
Signed-off-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-on: https://go-review.googlesource.com/c/oauth2/+/515675
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Adrian Dewhurst <adrian@tailscale.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
We no longer accept new provider-specific packages in this repo if all
they do is add a single endpoint variable. If you just want to add a
single endpoint, add it to the
pkg.go.dev/golang.org/x/oauth2/endpoints
package.
This repository uses Gerrit for code changes. To learn how to submit changes to
this repository, see https://golang.org/doc/contribute.html. In particular:
Excluding trivial changes, all contributions should be connected to an existing issue.
a835fc4358
