demarches-normaliennes/app/graphql/api/v2/context.rb

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class API::V2::Context < GraphQL::Query::Context
# This method is used to check if a given fragment is used in the given query.
# We need that in order to maintain backward compatibility for Types de Champ
# that we extended in later iterations of our schema.
def has_fragment?(fragment_name)
self[:has_fragment] ||= Hash.new do |hash, fragment_name|
visitor = HasFragment.new(query.document, fragment_name)
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visitor.visit
hash[fragment_name] = visitor.found
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end
self[:has_fragment][fragment_name]
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end
def internal_use?
self[:internal_use]
end
def authorized_demarche?(demarche)
if internal_use?
return true
end
# We are caching authorization logic because it is called for each node
# of the requested graph and can be expensive. Context is reset per request so it is safe.
self[:authorized] ||= Hash.new do |hash, demarche_id|
# Compute the hash value dynamically when first requested
authorized_administrateur = demarche.administrateurs.find do |administrateur|
if self[:token]
administrateur.valid_api_token?(self[:token])
else
administrateur.id == self[:administrateur_id]
end
end
hash[demarche_id] = authorized_administrateur.present?
end
self[:authorized][demarche.id]
end
# This is a query AST visitor that we use to check
# if a fragment with a given name is used in the given document.
# We check for both inline and standalone fragments.
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class HasFragment < GraphQL::Language::Visitor
def initialize(document, fragment_name)
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super(document)
@fragment_name = fragment_name.to_s
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@found = false
end
attr_reader :found
def on_inline_fragment(node, parent)
if node.type.name == @fragment_name
@found = true
end
super
end
def on_fragment_definition(node, parent)
if node.type.name == @fragment_name
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@found = true
end
super
end
end
end