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) } scope :approved, -> { where(approved: true) } scope :visible, -> { where(hidden: false) } scope :publicly, -> { where(hidden: false, approved: true) } # 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 description.present? description else 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 ' text << if approved 'is public' else 'has to be moderated before being publicly visible' end text << ' (and was requested to be removed)' if markedfordelete text end # Brief text describing the status of this screenshots (for admins) def adminstatus if approved 'Public' else # fa_icon('hourglass') + 'Waiting for approval' 'Unapproved' end end # Publish a screenshot from the moderation queue def approve! self.approved = true save! end # Hide a screenshot from the public. Moderator level can do this. def hide! self.hidden = true save! end def unhide! self.hidden = false save! end # Get the newest screenshots regardless of the package it belongs to def self.newest order(created_at: :desc) end # Return the part of the version up to the first - or + def upstream_version version.split(/[-+]/).first end # Returns the path to this screenshot's image on disk def disk_path ActiveStorage::Blob.service.send(:path_for, 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: package.id)) && !(screenshot.id == id) errors.add(:image, 'has already been uploaded for this package') end end end