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121 lines
2.9 KiB
121 lines
2.9 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is a project management system.
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# Copyright (C) 2012-2017 the OpenProject Foundation (OPF)
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See doc/COPYRIGHT.rdoc for more details.
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#++
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# rubocop:disable MethodName
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class Authorization::QueryTransformationVisitor < Arel::Visitors::Visitor
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attr_accessor :transformations,
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:args
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def initialize(transformations:,
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args:)
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self.transformations = transformations
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self.args = args
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super()
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end
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def accept(ast)
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applied_transformations.clear
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super
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end
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private
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def visit_Arel_SelectManager(ast)
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ast = replace_if_equals(ast, :all)
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ast.join_sources.each do |join_source|
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visit join_source
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end
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end
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def visit_Arel_Nodes_OuterJoin(ast)
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visit ast.right
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end
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def visit_Arel_Nodes_On(ast)
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ast.expr = replace_if_equals(ast.expr)
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visit ast.expr
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end
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def visit_Arel_Nodes_Grouping(ast)
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ast.expr = replace_if_equals(ast.expr)
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visit ast.expr
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end
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def visit_Arel_Nodes_Or(ast)
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ast.left = replace_if_equals(ast.left)
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visit ast.left
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ast.right = replace_if_equals(ast.right)
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visit ast.right
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end
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def visit_Arel_Nodes_And(ast)
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ast.children.each_with_index do |_, i|
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ast.children[i] = replace_if_equals(ast.children[i])
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visit ast.children[i]
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end
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end
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def method_missing(name, *args, &block)
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super unless name.to_s.start_with?('visit_')
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end
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def replace_if_equals(ast, key = nil)
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if applicable_transformation?(key || ast)
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transformations.for(key || ast).each do |transformation|
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ast = transformation.apply(ast, *args)
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end
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end
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ast
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end
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def applicable_transformation?(key)
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if transformations.for?(key) && !applied_transformations.include?(key)
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applied_transformations << key
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true
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else
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false
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end
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end
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def applied_transformations
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@applied_transformations ||= []
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end
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end
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