85 lines
3.1 KiB
Ruby
85 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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##
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# A note on determining whether an upload should be marked as secure:
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#
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# Some of these flags checked (e.g. all of the for_X flags and the opts[:type])
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# are only set when _initially uploading_ via UploadCreator and are not present
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# when an upload already exists.
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#
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# If the upload already exists the best way to figure out whether it should be
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# secure alongside the site settings is the access_control_post_id, because the
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# original post the upload is linked to has far more bearing on its security context
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# post-upload. If the access_control_post_id does not exist then we just rely
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# on the current secure? status, otherwise there would be a lot of additional
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# complex queries and joins to perform.
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class UploadSecurity
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def initialize(upload, opts = {})
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@upload = upload
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@opts = opts
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@upload_type = @opts[:type]
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end
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def should_be_secure?
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return false if !SiteSetting.secure_media?
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return false if uploading_in_public_context?
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(secure_attachment? || supported_media?) && uploading_in_secure_context?
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end
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private
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def uploading_in_public_context?
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@upload.for_theme || @upload.for_site_setting || @upload.for_gravatar || public_type? || used_for_custom_emoji? || based_on_regular_emoji?
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end
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def supported_media?
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FileHelper.is_supported_media?(@upload.original_filename)
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end
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def secure_attachment?
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!supported_media? && SiteSetting.prevent_anons_from_downloading_files
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end
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def uploading_in_secure_context?
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return true if SiteSetting.login_required?
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if @upload.access_control_post_id.present?
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return access_control_post_has_secure_media?
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end
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uploading_in_composer? || @upload.for_private_message || @upload.for_group_message || @upload.secure?
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end
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# whether the upload should remain secure or not after posting depends on its context,
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# which is based on the post it is linked to via access_control_post_id.
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# if that post is with_secure_media? then the upload should also be secure.
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# this may change to false if the upload was set to secure on upload e.g. in
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# a post composer then it turned out that the post itself was not in a secure context
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#
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# if there is no access control post id and the upload is currently secure, we
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# do not want to make it un-secure to avoid unintentionally exposing it
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def access_control_post_has_secure_media?
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# if the post is deleted the access_control_post will be blank...
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# TODO: deal with this in a better way
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return false if @upload.access_control_post.blank?
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@upload.access_control_post.with_secure_media?
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end
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def public_type?
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%w[avatar custom_emoji profile_background card_background].include?(@upload_type)
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end
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def uploading_in_composer?
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@upload_type == "composer"
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end
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def used_for_custom_emoji?
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@upload.id.present? && CustomEmoji.exists?(upload_id: @upload.id)
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end
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def based_on_regular_emoji?
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return false if @upload.origin.blank?
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uri = URI.parse(@upload.origin)
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return true if Emoji.all.map(&:url).include?("#{uri.path}?#{uri.query}")
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uri.path.include?("images/emoji")
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end
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end
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