class ActiveFedora::FixityService

def check

Returns true when the fixity check was successfully.
Executes a fixity check on Fedora and saves the Faraday::Response. 
def check
  @response = get_fixity_response_from_fedora
  status.match("SUCCESS") ? true : false
end

def encoded_url uri

See https://jira.duraspace.org/browse/FCREPO-1247 
def encoded_url uri
  if uri.match("fcr:versions")
    uri.gsub(/fcr:versions/,"fcr%3aversions")
  else
    uri
  end
end

def fixity_graph 

def fixity_graph
  ::RDF::Graph.new << ::RDF::Reader.for(:ttl).new(response.body)
end

def get_fixity_response_from_fedora 

def get_fixity_response_from_fedora
  uri = target + "/fcr:fixity"
  ActiveFedora.fedora.connection.get(encoded_url(uri))
end

def initialize target

Accepts an Fedora resource such as File.ldp_resource.subject 
def initialize target
  raise ArgumentError, 'You must provide a uri' unless target
  @target = target
end

def status 

def status
  fixity_graph.query(predicate: ActiveFedora::RDF::Fcrepo4.status).map(&:object).first.to_s
end