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Add RFC 8707 resource indicator support to OAuth flow #725

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Add RFC 8707 resource indicator support to OAuth flow #725

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7251b42
fix
MariaChrysafis Feb 28, 2026
878d061
Merge branch 'main' into maria/rfc-fix
MariaChrysafis Mar 5, 2026
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14 changes: 14 additions & 0 deletions client/transport/oauth.go
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Original file line number Diff line number Diff line change
Expand Up @@ -134,6 +134,7 @@ type AuthServerMetadata struct {
ResponseTypesSupported []string `json:"response_types_supported"`
GrantTypesSupported []string `json:"grant_types_supported,omitempty"`
TokenEndpointAuthMethodsSupported []string `json:"token_endpoint_auth_methods_supported,omitempty"`
Resource string `json:"resource,omitempty"`
}

// OAuthHandler handles OAuth authentication for HTTP requests
Expand Down Expand Up @@ -561,6 +562,11 @@ func (h *OAuthHandler) RegisterClient(ctx context.Context, clientName string) er
"scope": strings.Join(h.config.Scopes, " "),
}

// Add resource parameter if available (RFC 8707)
if metadata.Resource != "" {
regRequest["resource"] = metadata.Resource
}

// Add client_secret if this is a confidential client
if h.config.ClientSecret != "" {
regRequest["token_endpoint_auth_method"] = "client_secret_basic"
Expand Down Expand Up @@ -646,6 +652,10 @@ func (h *OAuthHandler) ProcessAuthorizationResponse(ctx context.Context, code, s
data.Set("client_id", h.config.ClientID)
data.Set("redirect_uri", h.config.RedirectURI)

if metadata.Resource != "" {
data.Set("resource", metadata.Resource)
}

if h.config.ClientSecret != "" {
data.Set("client_secret", h.config.ClientSecret)
}
Expand Down Expand Up @@ -725,6 +735,10 @@ func (h *OAuthHandler) GetAuthorizationURL(ctx context.Context, state, codeChall
params.Set("redirect_uri", h.config.RedirectURI)
params.Set("state", state)

if metadata.Resource != "" {
params.Set("resource", metadata.Resource)
}

if len(h.config.Scopes) > 0 {
params.Set("scope", strings.Join(h.config.Scopes, " "))
}
Expand Down