class Screenshot < ApplicationRecord belongs_to :package, inverse_of: :screenshots belongs_to :user, inverse_of: :screenshots # Default sorting: # - unapproved first (to see them at the top when moderating) # - otherwise show newest first default_scope { order(approved: :asc, hidden: :asc, created_at: :desc) } # Shrine include ImageUploader::Attachment(:simage) # adds an `simage` virtual attribute # Return caption for full-screen screenshots. # Takes the description of a screenshot if available. # Otherwise it falls back to the general description of its package. def caption if self.description.present? "#{self.description}" else "#{self.package.description}" end end # Future use… # def uploader # if self.user # self.user.name # else # 'Anonymous' # end # end # Long status text for public users def status text = 'This image ' if self.approved text << 'is public' else text << 'has to be moderated before being publicly visible' end if self.markedfordelete text << ' (and was requested to be removed)' end return text end # Brief text describing the status of this screenshots (for admins) def adminstatus if self.approved 'Public' else #fa_icon('hourglass') + 'Waiting for approval' 'Unapproved' end end # Publish a screenshot from the moderation queue def approve! self.approved = true self.save! end # Hide a screenshot from the public. Moderator level can do this. def hide! self.hidden = true self.save! end def unhide! self.hidden = false self.save! end # Get the newest screenshots regardless of the package it belongs to def self.newest self.order(created_at: :desc) end # Return the part of the version up to the first - or + def upstream_version self.version.split(/[\-\+]/).first end # Returns the path to this screenshot's image on disk def disk_path ActiveStorage::Blob.service.send(:path_for, self.image.key) end # Returns the MD5 hex digest of the current screenshot's data def checksum # local files stored on disk: # url = "#{Rails.root}/public/#{attachment.path}" Digest::MD5.hexdigest(disk_path) # remote files stored on another person's computer: #url = attachment.url #Digest::MD5.base64digest(Net::HTTP.get(URI(url))) end private # Validator that checks if the image has already been uploaded. # A generic uniqueness validator does not work because it would attribute # the error to the :image_fingerprint field and not the actual :image field. # Currently this check makes sure that the same screenshot is not uploaded # twice for the same package. However it allows the screenshot to be uploaded # for two different packages. Restricting that further may happen later. def validate_image_is_unique # Look for images with the same checksum / image_fingerprint if screenshot=Screenshot.find_by(image_fingerprint: image_fingerprint, package_id: self.package.id) unless screenshot.id == self.id errors.add(:image, "has already been uploaded for this package") end end end end