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[Client] Add OAuth authorization with the authorization code flow - #666
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The HTTP client gets decorated, so the transport keeps speaking plain PSR-18: AuthenticatingHttpClient authenticates every request and retries the ones the authenticator can act on. BearerToken sends a token you already have. A 401 or 403 now fails with an AuthorizationException that names the challenge, which connect() wraps in a ConnectionException without a retry.
Finds and validates the documents that say who guards an MCP server: protected resource metadata (RFC 9728) and authorization server metadata (RFC 8414 and OpenID Connect), plus the WWW-Authenticate challenge that points at them. All of it is @internal, since nothing uses it until the authenticator lands. Endpoints have to pass SecureUrl, and a document naming another issuer than it was fetched for is discarded.
Pass OAuth::forApplication('My App')->build() as `auth` and a client answers a
401 with discovery, client registration, the authorization code flow with PKCE
and a retry. It refreshes tokens, handles step-up challenges and refuses what a
hostile server could send.
Client id metadata documents, the console handler, client credentials,
private_key_jwt and cross-app access follow in their own changes, so their
conformance scenarios stay in the baselines.
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Part of #316, #319, #320, #321, #322 & #323 - third slice of the client authorization in chr-hertel#53. Builds on #663 & #664, so please only look at the last commit until those are merged.
A
401now leads to discovery, client registration, the browser, a token and a retry - nothing else changes at the call site. Refresh, step-up andoffline_accessare included, and so are the checks against a hostile server, seeWhat the Client Refusesindocs/client/authorization.md.Client id metadata documents, the console handler & machine grants (client credentials,
private_key_jwt, cross-app access) follow - their conformance scenarios stay in the baselines. Web applications finishing the flow in a later request are #630 / #660, independent of this.This also adds the Keycloak end-to-end job.