Add support of MongoDB Extended JSON to Mongo::Crypt::Handle

lib/mongo/crypt/handle.rb

@@ -49,9 +49,21 @@ def initialize(kms_providers, kms_tls_options, options={})
           Binding.method(:mongocrypt_destroy)
         )
 
-        @kms_tls_options =  kms_tls_options
+        @kms_tls_options = kms_tls_options
+
+        @schema_map =
+          case options[:schema_map].class
+          when String
+            begin
+              # Rebuild to raw JSON string as schema map implementation requires BSON variable instances
+              BSON::ExtJSON.parse(options[:schema_map])
+            rescue JSON::ParserError
+              nil
+            end
+          else
+            options[:schema_map]
+          end
 
-        @schema_map = options[:schema_map]
         set_schema_map if @schema_map
 
         @logger = options[:logger]

spec/mongo/crypt/handle_spec.rb

@@ -22,6 +22,16 @@
         end
       end
 
+      context 'with schema map in JSON string' do
+        let(:schema_map) do
+          File.read 'spec/support/crypt/schema_maps/schema_map_local.json'
+        end
+
+        it 'does not raise an exception' do
+          expect { handle }.not_to raise_error
+        end
+      end
+
       context 'with invalid schema map' do
         let(:schema_map) { '' }