e424563794
Introduce BearerChallengeMiddleware on MCP, Console and Connect GraphQL, Files, and OAuth2 userinfo. Call sites record challenge intent in context via NoteUnauthenticated, NoteInvalidToken, and NoteInsufficientScope; the middleware applies resource_metadata, invalid_token, and insufficient_scope on WriteHeader. OAuth2 access token middleware flags rejected Bearer tokens for invalid_token challenges. Add Authorizer.ScopesForAction for the scope auth-param. Signed-off-by: Ludovic Vielle <ludovic@probo.com>
90 lines
2.8 KiB
Go
90 lines
2.8 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package bearertoken
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import (
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"fmt"
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"net/http"
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"strings"
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"go.probo.inc/probo/pkg/baseurl"
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"go.probo.inc/probo/pkg/coredata"
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)
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const (
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BearerErrInvalidToken = "invalid_token"
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BearerErrInsufficientScope = "insufficient_scope"
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)
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func protectedResourceMetadataURL(baseURL *baseurl.BaseURL) string {
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return baseURL.WithPath("/.well-known/oauth-protected-resource").MustString()
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}
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// BearerChallenge builds the WWW-Authenticate header value per RFC 6750 and RFC 9728.
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// Pass errorCode == "" for discovery-only (401, no Bearer attempt).
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// Pass scopes only when errorCode == BearerErrInsufficientScope.
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func BearerChallenge(
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baseURL *baseurl.BaseURL,
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errorCode string,
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scopes ...coredata.OAuth2Scope,
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) string {
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metadataURL := protectedResourceMetadataURL(baseURL)
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var parts []string
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if errorCode != "" {
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parts = append(parts, fmt.Sprintf(`error="%s"`, errorCode))
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}
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if errorCode == BearerErrInsufficientScope && len(scopes) > 0 {
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scopeValues := make([]string, len(scopes))
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for i, scope := range scopes {
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scopeValues[i] = string(scope)
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}
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parts = append(parts, fmt.Sprintf(`scope="%s"`, strings.Join(scopeValues, " ")))
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}
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parts = append(parts, fmt.Sprintf(`resource_metadata="%s"`, metadataURL))
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return "Bearer " + strings.Join(parts, ", ")
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}
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func SetBearerChallenge(
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w http.ResponseWriter,
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baseURL *baseurl.BaseURL,
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errorCode string,
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scopes ...coredata.OAuth2Scope,
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) {
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w.Header().Set("WWW-Authenticate", BearerChallenge(baseURL, errorCode, scopes...))
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}
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// SetBearerUnauthenticated sets a discovery-only challenge (RFC 9728 resource_metadata).
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func SetBearerUnauthenticated(w http.ResponseWriter, baseURL *baseurl.BaseURL) {
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SetBearerChallenge(w, baseURL, "")
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}
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func SetBearerInvalidToken(w http.ResponseWriter, baseURL *baseurl.BaseURL) {
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SetBearerChallenge(w, baseURL, BearerErrInvalidToken)
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}
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func SetBearerInsufficientScope(
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w http.ResponseWriter,
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baseURL *baseurl.BaseURL,
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scopes ...coredata.OAuth2Scope,
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) {
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SetBearerChallenge(w, baseURL, BearerErrInsufficientScope, scopes...)
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}
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