Merge pull request #561 from identw/fix-create-user-for-4x-versions

Fixed the problem: the user was not created for Mongodb 4.x

Author: ekohl

lib/puppet/provider/mongodb.rb

@@ -174,4 +174,13 @@ def self.mongo_26?
   def mongo_26?
     self.class.mongo_26?
   end
+
+  def self.mongo_4?
+    v = mongo_version
+    !v[%r{^4\.}].nil?
+  end
+
+  def mongo_4?
+    self.class.mongo_4?
+  end
 end

lib/puppet/provider/mongodb_user/mongodb.rb

@@ -53,6 +53,11 @@ def create
         digestPassword: false
       }
 
+      if mongo_4?
+        # SCRAM-SHA-256 requires digestPassword to be true.
+        command[:mechanisms] = ['SCRAM-SHA-1']
+      end
+
       mongo_eval("db.runCommand(#{command.to_json})", @resource[:database])
     else
       Puppet.warning 'User creation is available only from master host'