fix: Update ScopesSupported to match RFC 9728 Section 2

config.yaml

@@ -53,9 +53,8 @@ protected_resource_metadata:
   resource_identifier: http://localhost:8080/sse
   audience: 2xGW_poFYoObUE_vUQxvGdPSUPwa
   scopes_supported:
-    - initialize: "mcp_init"
-    - tools/call:
-      - echo_tool: "mcp_echo_tool"
+    - "read:tools"
+    - "read:resources"
   authorization_servers:
     - https://api.asgardeo.io/t/openmcpauthdemo/oauth2/token
   jwks_uri: https://api.asgardeo.io/t/openmcpauthdemo/oauth2/jwks

internal/authz/default.go

@@ -100,10 +100,17 @@ func (p *defaultProvider) ProtectedResourceMetadataHandler() http.HandlerFunc {
 		w.Header().Set("Content-Type", "application/json")
 		meta := map[string]interface{}{
 			"audience":              p.cfg.ProtectedResourceMetadata.Audience,
-			"scopes_supported":      p.cfg.ProtectedResourceMetadata.ScopesSupported,
 			"authorization_servers": p.cfg.ProtectedResourceMetadata.AuthorizationServers,
 		}
 
+		if len(p.cfg.ProtectedResourceMetadata.ScopesSupported) > 0 {
+			meta["scopes_supported"] = p.cfg.ProtectedResourceMetadata.ScopesSupported
+		}
+
+		if p.cfg.ProtectedResourceMetadata.ResourceIdentifier != "" {
+			meta["resource"] = p.cfg.ProtectedResourceMetadata.ResourceIdentifier
+		}
+
 		if p.cfg.ProtectedResourceMetadata.JwksURI != "" {
 			meta["jwks_uri"] = p.cfg.ProtectedResourceMetadata.JwksURI
 		}

internal/authz/scope_validator.go

@@ -7,7 +7,6 @@ import (
 
 	"github.com/golang-jwt/jwt/v4"
 	"github.com/wso2/open-mcp-auth-proxy/internal/config"
-	"github.com/wso2/open-mcp-auth-proxy/internal/util"
 )
 
 type ScopeValidator struct{}
@@ -18,11 +17,7 @@ func (d *ScopeValidator) ValidateAccess(
 	claims *jwt.MapClaims,
 	config *config.Config,
 ) AccessControlResult {
-	env, err := util.ParseRPCRequest(r)
-	if err != nil {
-		return AccessControlResult{DecisionDeny, "bad JSON-RPC request"}
-	}
-	requiredScopes := util.GetRequiredScopes(config, env)
+	requiredScopes := config.ProtectedResourceMetadata.ScopesSupported
 
 	if len(requiredScopes) == 0 {
 		return AccessControlResult{DecisionAllow, ""}

internal/config/config.go

@@ -70,12 +70,12 @@ type ResponseConfig struct {
 }
 
 type ProtectedResourceMetadata struct {
-	ResourceIdentifier     string                   `yaml:"resource_identifier"`
-	Audience               string                   `yaml:"audience"`
-	ScopesSupported        []map[string]interface{} `yaml:"scopes_supported"`
-	AuthorizationServers   []string                 `yaml:"authorization_servers"`
-	JwksURI                string                   `yaml:"jwks_uri,omitempty"`
-	BearerMethodsSupported []string                 `yaml:"bearer_methods_supported,omitempty"`
+	ResourceIdentifier     string   `yaml:"resource_identifier"`
+	Audience               string   `yaml:"audience"`
+	ScopesSupported        []string `yaml:"scopes_supported"`
+	AuthorizationServers   []string `yaml:"authorization_servers"`
+	JwksURI                string   `yaml:"jwks_uri,omitempty"`
+	BearerMethodsSupported []string `yaml:"bearer_methods_supported,omitempty"`
 }
 
 type PathConfig struct {

internal/util/jwks.go

@@ -10,7 +10,6 @@ import (
 	"strings"
 
 	"github.com/golang-jwt/jwt/v4"
-	"github.com/wso2/open-mcp-auth-proxy/internal/config"
 	logger "github.com/wso2/open-mcp-auth-proxy/internal/logging"
 )
 
@@ -160,55 +159,6 @@ func ParseJWT(tokenStr string) (jwt.MapClaims, error) {
 	return claims, nil
 }
 
-// Process the required scopes
-func GetRequiredScopes(cfg *config.Config, requestBody *RPCEnvelope) []string {
-
-	var scopeObj interface{}
-	found := false
-	for _, m := range cfg.ProtectedResourceMetadata.ScopesSupported {
-		if val, ok := m[requestBody.Method]; ok {
-			scopeObj = val
-			found = true
-			break
-		}
-	}
-	if !found {
-		return nil
-	}
-
-	switch v := scopeObj.(type) {
-	case string:
-		return []string{v}
-	case []any:
-		if requestBody.Params != nil {
-			if paramsMap, ok := requestBody.Params.(map[string]any); ok {
-				name, ok := paramsMap["name"].(string)
-				if ok {
-					for _, item := range v {
-						if scopeMap, ok := item.(map[interface{}]interface{}); ok {
-							if scopeVal, exists := scopeMap[name]; exists {
-								if scopeStr, ok := scopeVal.(string); ok {
-									return []string{scopeStr}
-								}
-								if scopeArr, ok := scopeVal.([]any); ok {
-									var scopes []string
-									for _, s := range scopeArr {
-										if str, ok := s.(string); ok {
-											scopes = append(scopes, str)
-										}
-									}
-									return scopes
-								}
-							}
-						}
-					}
-				}
-			}
-		}
-	}
-
-	return nil
-}
 
 // Extracts the Bearer token from the Authorization header
 func ExtractAccessToken(authHeader string) (string, error) {