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auth: add OAuth 2.0 Protected Resource Metadata handler

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This change adds support for RFC 9728 (OAuth 2.0 Protected Resource Metadata)
by introducing a `ProtectedResourceMetadataHandler`.

The handler includes built-in CORS support with `Access-Control-Allow-Origin: *`
by default, as OAuth metadata is public information meant for client discovery.

Documentation includes examples for using custom CORS policies with
popular middleware libraries (github.com/rs/cors and github.com/jub0bs/cors).

The implementation follows RFC 9728 §3.1 for OAuth 2.0 Authorization Server
Metadata discovery, enabling clients to discover protected resource capabilities
and authentication requirements.
This commit is contained in:
Eliya Sadan 2025-12-08 21:54:52 +02:00 • committed by GitHub
commit d6d6edd6d4
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examples/server/auth-middleware/go.sum
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@ -6,5 +6,7 @@ github.com/google/jsonschema-go v0.3.0 h1:6AH2TxVNtk3IlvkkhjrtbUc4S8AvO0Xii0DxIy
github.com/google/jsonschema-go v0.3.0/go.mod h1:r5quNTdLOYEz95Ru18zA0ydNbBuYoo9tgaYcxEYhJVE=
github.com/yosida95/uritemplate/v3 v3.0.2 h1:Ed3Oyj9yrmi9087+NczuL5BwkIc4wvTb5zIM+UJPGz4=
github.com/yosida95/uritemplate/v3 v3.0.2/go.mod h1:ILOh0sOhIJR3+L/8afwt/kE++YT040gmv5BQTMR2HP4=
golang.org/x/oauth2 v0.30.0 h1:dnDm7JmhM45NNpd8FDDeLhK6FwqbOf4MLCM9zb1BOHI=
golang.org/x/oauth2 v0.30.0/go.mod h1:B++QgG3ZKulg6sRPGD/mqlHQs5rB3Ml9erfeDY7xKlU=
golang.org/x/tools v0.34.0 h1:qIpSLOxeCYGg9TrcJokLBG4KFA6d795g0xkBkiESGlo=
golang.org/x/tools v0.34.0/go.mod h1:pAP9OwEaY1CAW3HOmg3hLZC5Z0CCmzjAF2UQMSqNARg=