From a3120234b1b5062f675a292639b702efc3c03287 Mon Sep 17 00:00:00 2001
From: Peter Sanchez <peter@netlandish.com>
Date: Tue, 16 May 2023 12:04:22 -0600
Subject: [PATCH] Adding metadata endpoing for RFC 8414

---
 routes.go | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/routes.go b/routes.go
index 27c4435..a29b1d2 100644
--- a/routes.go
+++ b/routes.go
@@ -655,6 +655,49 @@ func (s *Service) IntrospectPOST(c echo.Context) error {
 	return c.JSON(http.StatusOK, &ret)
 }
 
+// OAuthMetadata sends the OAuth 2 server metadata as specified by RFC 8414.
+// This should be wired up in your echo server routes to the following URL:
+// `/.well-known/oauth-authorization-server`
+func (s *Service) OAuthMetadata(c echo.Context) error {
+	gctx := c.(*server.Context)
+	origin := gctx.Server.Config.BaseURI()
+	aURL, err := url.JoinPath(origin, c.Echo().Reverse(s.RouteName("authorize")))
+	if err != nil {
+		return err
+	}
+	tURL, err := url.JoinPath(origin, c.Echo().Reverse(s.RouteName("access_token_post")))
+	if err != nil {
+		return err
+	}
+	iURL, err := url.JoinPath(origin, c.Echo().Reverse(s.RouteName("introspect_post")))
+	if err != nil {
+		return err
+	}
+
+	ret := struct {
+		Issuer        string   `json:"issuer"`
+		AuthEndpoint  string   `json:"authorization_endpoint"`
+		TokenEndpoint string   `json:"token_endpoint"`
+		Scopes        []string `json:"scopes_supported"`
+		Responses     []string `json:"response_types_supported"`
+		Grants        []string `json:"grant_types_supported"`
+		Doc           string   `json:"service_documentation"`
+		IntroEndpoint string   `json:"introspection_endpoint"`
+		IntroAuth     []string `json:"introspection_endpoint_auth_methods_supported"`
+	}{
+		Issuer:        origin,
+		AuthEndpoint:  aURL,
+		TokenEndpoint: tURL,
+		Scopes:        s.config.Scopes,
+		Responses:     []string{"code"},
+		Grants:        []string{"authorization_code"},
+		Doc:           s.config.DocumentationURL,
+		IntroEndpoint: iURL,
+		IntroAuth:     []string{"none"},
+	}
+	return c.JSON(http.StatusOK, &ret)
+}
+
 // RouteName ...
 func (s *Service) RouteName(value string) string {
 	return fmt.Sprintf("%s:%s", s.name, value)
-- 
2.45.2