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Versions: 27
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Contents
module Spotlight
###
# Update an ActiveRecord resource that containes identifiers for all the
# levels of an image resource described in a IIIF manifest
#
class IiifResourceResolver
delegate :iiif_manifest_url, :iiif_canvas_id, :iiif_image_id, to: :resource
def initialize(resource)
@resource = resource
end
def resolve!
resource.iiif_tilesource = updated_tilesource
return resource.save if resource.changed?
Rails.logger.info("#{self.class.name} resolved #{iiif_manifest_url}, but nothing changed.")
end
private
attr_reader :resource
def updated_tilesource
"#{updated_image['resource']['service']['@id']}/info.json"
end
def updated_image
new_image = updated_canvas['images'].find do |image|
image['@id'] == iiif_image_id
end
raise(ManifestError, "No image with @id #{iiif_image_id} found in #{iiif_manifest_url}") unless new_image
new_image
end
def updated_canvas
new_canvas = canvases.find do |canvas|
canvas['@id'] == iiif_canvas_id
end
raise(ManifestError, "No canvas with @id #{iiif_canvas_id} found in #{iiif_manifest_url}") unless new_canvas
new_canvas
end
def canvases
sequence['canvases'] || []
end
# Currently only supporting a single sequence
def sequence
Array.wrap(manifest['sequences']).first || {}
end
def response
@response ||= begin
Faraday.get(iiif_manifest_url).body
rescue Faraday::Error => e
Rails.logger.warn("#{self.class.name} failed to fetch #{iiif_manifest_url} with: #{e}")
'{}'
end
end
def manifest
@manifest ||= begin
JSON.parse(response)
rescue JSON::ParserError => e
Rails.logger.warn("#{self.class.name} failed to parse #{iiif_manifest_url} with: #{e}")
{}
end
end
class ManifestError < RuntimeError; end
end
end
Version data entries
27 entries across 27 versions & 1 rubygems