69 lines
2.3 KiB
Ruby
69 lines
2.3 KiB
Ruby
#
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# Copyright (C) 2014 - present Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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module Lti
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class Asset
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def self.opaque_identifier_for(asset, context: nil)
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shard = asset.shard
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shard.activate do
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lti_context_id = context_id_for(asset, shard)
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set_asset_context_id(asset, lti_context_id, context: context)
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end
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end
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def self.set_asset_context_id(asset, lti_context_id, context: nil)
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if asset.respond_to?('lti_context_id')
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global_context_id = global_context_id_for(asset)
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if asset.new_record?
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asset.lti_context_id = global_context_id
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elsif asset.lti_context_id?
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lti_context_id = (old_id = old_id_for_user_in_context(asset, context)) ? old_id : asset.lti_context_id
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else
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Shackles.activate(:master) {asset.reload}
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unless asset.lti_context_id
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asset.lti_context_id = global_context_id
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Shackles.activate(:master) {asset.save!}
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end
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lti_context_id = asset.lti_context_id
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end
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end
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lti_context_id
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end
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def self.old_id_for_user_in_context(asset, context)
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if asset.is_a?(User) && context
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context.shard.activate do
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asset.past_lti_ids.where(context: context).take&.user_lti_context_id
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end
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end
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end
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def self.context_id_for(asset, shard = nil)
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shard ||= asset.shard
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str = asset.asset_string.to_s
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raise "Empty value" if str.blank?
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Canvas::Security.hmac_sha1(str, shard.settings[:encryption_key])
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end
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def self.global_context_id_for(asset)
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str = asset.global_asset_string.to_s
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raise "Empty value" if str.blank?
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Canvas::Security.hmac_sha1(str, asset.shard.settings[:encryption_key])
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end
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end
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end
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