Plugin hooks (#1452)

* Refactor session and plugin code
* Add context to job tasks
* Show hooks in plugins page
* Refactor session management

pkg/plugin/hooks.go

@@ -0,0 +1,125 @@
+package plugin
+
+import (
+	"github.com/stashapp/stash/pkg/plugin/common"
+)
+
+type HookTriggerEnum string
+
+// Scan-related hooks are current disabled until post-hook execution is
+// integrated.
+
+const (
+	SceneMarkerCreatePost  HookTriggerEnum = "SceneMarker.Create.Post"
+	SceneMarkerUpdatePost  HookTriggerEnum = "SceneMarker.Update.Post"
+	SceneMarkerDestroyPost HookTriggerEnum = "SceneMarker.Destroy.Post"
+
+	SceneCreatePost  HookTriggerEnum = "Scene.Create.Post"
+	SceneUpdatePost  HookTriggerEnum = "Scene.Update.Post"
+	SceneDestroyPost HookTriggerEnum = "Scene.Destroy.Post"
+
+	ImageCreatePost  HookTriggerEnum = "Image.Create.Post"
+	ImageUpdatePost  HookTriggerEnum = "Image.Update.Post"
+	ImageDestroyPost HookTriggerEnum = "Image.Destroy.Post"
+
+	GalleryCreatePost  HookTriggerEnum = "Gallery.Create.Post"
+	GalleryUpdatePost  HookTriggerEnum = "Gallery.Update.Post"
+	GalleryDestroyPost HookTriggerEnum = "Gallery.Destroy.Post"
+
+	MovieCreatePost  HookTriggerEnum = "Movie.Create.Post"
+	MovieUpdatePost  HookTriggerEnum = "Movie.Update.Post"
+	MovieDestroyPost HookTriggerEnum = "Movie.Destroy.Post"
+
+	PerformerCreatePost  HookTriggerEnum = "Performer.Create.Post"
+	PerformerUpdatePost  HookTriggerEnum = "Performer.Update.Post"
+	PerformerDestroyPost HookTriggerEnum = "Performer.Destroy.Post"
+
+	StudioCreatePost  HookTriggerEnum = "Studio.Create.Post"
+	StudioUpdatePost  HookTriggerEnum = "Studio.Update.Post"
+	StudioDestroyPost HookTriggerEnum = "Studio.Destroy.Post"
+
+	TagCreatePost  HookTriggerEnum = "Tag.Create.Post"
+	TagUpdatePost  HookTriggerEnum = "Tag.Update.Post"
+	TagDestroyPost HookTriggerEnum = "Tag.Destroy.Post"
+)
+
+var AllHookTriggerEnum = []HookTriggerEnum{
+	SceneMarkerCreatePost,
+	SceneMarkerUpdatePost,
+	SceneMarkerDestroyPost,
+
+	SceneCreatePost,
+	SceneUpdatePost,
+	SceneDestroyPost,
+
+	ImageCreatePost,
+	ImageUpdatePost,
+	ImageDestroyPost,
+
+	GalleryCreatePost,
+	GalleryUpdatePost,
+	GalleryDestroyPost,
+
+	MovieCreatePost,
+	MovieUpdatePost,
+	MovieDestroyPost,
+
+	PerformerCreatePost,
+	PerformerUpdatePost,
+	PerformerDestroyPost,
+
+	StudioCreatePost,
+	StudioUpdatePost,
+	StudioDestroyPost,
+
+	TagCreatePost,
+	TagUpdatePost,
+	TagDestroyPost,
+}
+
+func (e HookTriggerEnum) IsValid() bool {
+
+	switch e {
+	case SceneMarkerCreatePost,
+		SceneMarkerUpdatePost,
+		SceneMarkerDestroyPost,
+
+		SceneCreatePost,
+		SceneUpdatePost,
+		SceneDestroyPost,
+
+		ImageCreatePost,
+		ImageUpdatePost,
+		ImageDestroyPost,
+
+		GalleryCreatePost,
+		GalleryUpdatePost,
+		GalleryDestroyPost,
+
+		MovieCreatePost,
+		MovieUpdatePost,
+		MovieDestroyPost,
+
+		PerformerCreatePost,
+		PerformerUpdatePost,
+		PerformerDestroyPost,
+
+		StudioCreatePost,
+		StudioUpdatePost,
+		StudioDestroyPost,
+
+		TagCreatePost,
+		TagUpdatePost,
+		TagDestroyPost:
+		return true
+	}
+	return false
+}
+
+func (e HookTriggerEnum) String() string {
+	return string(e)
+}
+
+func addHookContext(argsMap common.ArgsMap, hookContext common.HookContext) {
+	argsMap[common.HookContextKey] = hookContext
+}