From d20a646ae66c62c660b3b41811182d88c810eabf Mon Sep 17 00:00:00 2001
From: Spencer Alan <hello@spenceralan.com>
Date: Wed, 5 Dec 2018 15:11:10 -0500
Subject: [PATCH] • add model to parse scim queries

---
 app/models/scim_rails/scim_query_parser.rb | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+), 0 deletions(-)
 create mode 100644 app/models/scim_rails/scim_query_parser.rb

diff --git a/app/models/scim_rails/scim_query_parser.rb b/app/models/scim_rails/scim_query_parser.rb
new file mode 100644
index 0000000..e5103d1
--- /dev/null
+++ b/app/models/scim_rails/scim_query_parser.rb
@@ -0,0 +1,45 @@
+module ScimRails
+  class ScimQueryParser
+    attr_accessor :query_elements
+
+    def initialize(query_string)
+      self.query_elements = query_string.split(" ")
+    end
+
+    def attribute
+      attribute = query_elements.dig(0)
+      raise ScimRails::ExceptionHandler::InvalidQuery if attribute.blank?
+      attribute = attribute.to_sym
+
+      mapped_attribute = attribute_mapping(attribute)
+      raise ScimRails::ExceptionHandler::InvalidQuery if mapped_attribute.blank?
+      mapped_attribute
+    end
+
+    def operator
+      sql_comparison_operator(query_elements.dig(1))
+    end
+
+    def parameter
+      parameter = query_elements.dig(2)
+      return if parameter.blank?
+      parameter.gsub(/"/, "")
+    end
+
+    private
+
+    def attribute_mapping(attribute)
+      ScimRails.config.queryable_user_attributes[attribute]
+    end
+
+    def sql_comparison_operator(element)
+      case element
+      when "eq"
+        "="
+      else
+        # TODO: implement additional query filters
+        raise ScimRails::ExceptionHandler::InvalidQuery
+      end
+    end
+  end
+end
--
libgit2 0.21.0