plugin: add IManager.GetRegisteredAttestationSchemes

Add a method to retrieve the names of attestation schemes implemented by
registered plugins.

Signed-off-by: Sergei Trofimov <[email protected]>

builtin/README.md

@@ -9,6 +9,6 @@ in turn, can be (re-)generated by running [gen-schemes](../scripts/gen-schemes)
 script.
 
 > **Note**: `gen-schemes` script repeatedly invokes `gopls` and `guru` in order
-> to identify plugin implementations. This means that it is very so. Because of
+> to identify plugin implementations. This means that it is very slow. Because of
 > this, a static version of `schemes.gen.go` is currently submitted as part of
 > the source.

builtin/builtin_loader.go

@@ -112,6 +112,22 @@ func GetBuiltinHandleByNameUsing[I plugin.IPluggable](ldr *BuiltinLoader, name s
 	return handle, nil
 }
 
+func GetBuiltinLoadedAttestationSchemes[I plugin.IPluggable](ldr *BuiltinLoader) []string {
+	schemes := make([]string, len(ldr.loadedByName))
+
+	i := 0
+	for _, ihandle := range ldr.loadedByName {
+		if _, ok := ihandle.(I); !ok {
+			continue
+		}
+
+		schemes[i] = ihandle.GetAttestationScheme()
+		i += 1
+	}
+
+	return schemes
+}
+
 func GetBuiltinHandleByAttestationSchemeUsing[I plugin.IPluggable](
 	ldr *BuiltinLoader,
 	scheme string,

builtin/builtin_manager.go

@@ -82,6 +82,10 @@ func (o *BuiltinManager[I]) GetRegisteredMediaTypes() []string {
 	return registeredMediatTypes
 }
 
+func (o *BuiltinManager[I]) GetRegisteredAttestationSchemes() []string {
+	return GetBuiltinLoadedAttestationSchemes[I](o.loader)
+}
+
 func (o *BuiltinManager[I]) LookupByName(name string) (I, error) {
 	return GetBuiltinHandleByNameUsing[I](o.loader, name)
 }

plugin/goplugin_loader.go

@@ -212,6 +212,22 @@ func GetGoPluginHandleByNameUsing[I IPluggable](ldr *GoPluginLoader, name string
 	return plugged.Handle, nil
 }
 
+func GetGoPluginLoadedAttestationSchemes[I IPluggable](ldr *GoPluginLoader) []string {
+	schemes := make([]string, len(ldr.loadedByName))
+
+	i := 0
+	for _, ictx := range ldr.loadedByName {
+		if _, ok := ictx.(*PluginContext[I]); !ok {
+			continue
+		}
+
+		schemes[i] = ictx.GetAttestationScheme()
+		i += 1
+	}
+
+	return schemes
+}
+
 func GetGoPluginHandleByAttestationSchemeUsing[I IPluggable](
 	ldr *GoPluginLoader,
 	scheme string,

plugin/goplugin_manager.go

@@ -94,6 +94,10 @@ func (o *GoPluginManager[I]) GetRegisteredMediaTypes() []string {
 	return registeredMediatTypes
 }
 
+func (o *GoPluginManager[I]) GetRegisteredAttestationSchemes() []string {
+	return GetGoPluginLoadedAttestationSchemes[I](o.loader)
+}
+
 func (o *GoPluginManager[I]) LookupByName(name string) (I, error) {
 	return GetGoPluginHandleByNameUsing[I](o.loader, name)
 }

plugin/imanager.go

@@ -15,17 +15,22 @@ type IManager[I IPluggable] interface {
 	Close() error
 
 	// IsRegisteredMediaType returns true iff the provided mediaType has
-	// been regesitred with thet manager as hanedled by one of the
+	// been registered with the manager as handled by one of the
 	// discovered plugins.
 	IsRegisteredMediaType(mediaType string) bool
 
 	// GetRegisteredMediaTypes returns a []string of media types that have
-	// been registered with the manger by discovered plugins.
+	// been registered with the manager by discovered plugins.
 	GetRegisteredMediaTypes() []string
 
+	// GetRegisteredAttestationSchemes returns a []string of names for
+	// schemes that have been registered with the manager by discovered
+	// plugins.
+	GetRegisteredAttestationSchemes() []string
+
 	// LookupByMediaType returns a handle (implementation of the managed
 	// interface) to the plugin that handles the specified mediaType. If
-	// the mediaType is not handled by any of the registred plugins, an
+	// the mediaType is not handled by any of the registered plugins, an
 	// error is returned.
 	LookupByMediaType(mediaType string) (I, error)