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Let F be a closed surface, and psi be a diffeomorphism of F. An interesting question with nice topological implications for detecting homotopy ribbon fibered knots is whether psi extends over some handlebody with boundary F. In 1985, Casson-Long gave an algorithm for answering this question. In this talk, first we will discuss how bordered Floer homology can be used to detect whether psi extends over a specific handlebody. Then, we will outline how to adapt ideas of Casson-Long to give an algorithm using bordered Floer homology to detect whether psi extends over any compression body. This is a joint work with Robert Lipshitz.