56 lines
1.5 KiB
Ruby
56 lines
1.5 KiB
Ruby
#
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# Copyright (C) 2015 - 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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#
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class ScopeFilter
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def initialize(context, user, relation=nil)
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@context = context
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@user = user
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@relation = relation
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end
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attr_reader :context, :user
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# Implement in subclasses.
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def scope
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@relation
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end
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private
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def can?(*permissions)
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permissions.all? do |permission|
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context.grants_right?(user, permission)
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end
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end
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# Facilitates conditionally chaining scopes.
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# Use within subclassed implementations of #scope.
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# i.e.:
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#
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# def scope
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# concat_scope { context.active_assignments }
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# concat_scope { @relation.published unless can_view_unpublished_assignments? }
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# concat_scope do
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# if context.feature_enabled?(:differentiated_assignments)
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# DifferentiableAssignment.scope_filter(@relation, user, context)
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# end
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# end
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# end
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def concat_scope
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@relation = yield || @relation
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end
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end
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