Preprocessor for assets in AEM as a cloud service

Question

Environment - AEM as Cloud Service

Do you know of any OSGI service or interface which i can use to hook up a service to run a few validations on an asset before the asset compute services kick-in to process the asset ? To be more specific, I'm looking at building a few validation rules like

• asset should follow a particular naming convention
• assets can only be uploaded to their designated paths, etc

I want to restrict the asset from being processed if it does not pass any of the validation rules. Where can i write this logic ?

I'm aware of post-processing logic but I'm looking for a pre-processing one ? Any leads or ideas to implement this will be highly appreciated. TIA.