Add params parser and spec

ee/lib/ee/gitlab/scim/params_parser.rb

+# frozen_string_literal: true
+
+module EE
+  module Gitlab
+    module Scim
+      class ParamsParser
+        FILTER_OPERATORS = %w[eq]
+        OPERATIONS_OPERATORS = %w[Replace Add]
+        ATTRIBUTE_MAP = {
+          id: :extern_uid,
+          'name.formatted': :name,
+          'emails[type eq "work".value': :mail
+        }.with_indifferent_access
+
+        def initialize(params)
+          @filter = params[:filter]
+          @operations = params[:operations]
+          @hash = {}
+        end
+
+        def to_hash
+          process_filter
+          process_operations
+
+          @hash
+        end
+
+        private
+
+        def process_filter
+          return unless @filter
+
+          attribute, operator, value = @filter.split
+
+          return unless FILTER_OPERATORS.include?(operator)
+          return unless ATTRIBUTE_MAP[attribute]
+
+          @hash[ATTRIBUTE_MAP[attribute]] = value.tr('\"', '')
+        end
+
+        def process_operations
+          return unless @operations
+
+          @operations.each do |operation|
+            next unless OPERATIONS_OPERATORS.contains?(operation[:op])
+
+            attribute = ATTRIBUTE_MAP[operation[:path]]
+
+            @hash[attribute] = operation[:value] if attribute
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/lib/gitlab/scim/params_parser_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe EE::Gitlab::Scim::ParamsParser do
+  describe '#to_hash' do
+    it 'returns the correct filter attributes' do
+      filter = 'id eq "6ba81b08-77da"'
+
+      expect(described_class.new(filter: filter).to_hash).to eq(extern_uid: '6ba81b08-77da')
+    end
+  end
+end