Add urls for provider endpoints

This is just for completeness and probably won't be used by
provider code.

app/models/endpoint.rb

@@ -12,8 +12,6 @@ class Endpoint < ApplicationRecord
   after_create  :endpoint_created
   after_destroy :endpoint_destroyed
 
-  delegate :to_s, :to => :url, :allow_nil => true
-
   def endpoint_created
     resource.endpoint_created(role) if resource.respond_to?(:endpoint_created)
   end
@@ -54,8 +52,20 @@ def ssl_cert_store
     nil # use system defaults
   end
 
+  def to_s
+    (url || generate_uri).to_s
+  end
+
   private
 
+  def generate_uri
+    return unless resource.kind_of?(ExtManagementSystem)
+    host = hostname || ipaddress || resource.hostname
+    path = ["", resource.try(:api_version) || api_version, ""].compact.join("/")
+    query = {:verify_ssl => verify_ssl?, :security_protocol => security_protocol }.delete_blanks.to_query
+    URI::Generic.new(resource.emstype, nil, host, port, nil, path, nil, query, nil)
+  end
+
   def resolve_verify_ssl_value(val)
     case val
     when true  then OpenSSL::SSL::VERIFY_PEER

spec/models/endpoint_spec.rb

@@ -129,13 +129,19 @@
   end
 
   context "to_s" do
-    it "returns the url if set" do
+    it "returns the url with url set" do
       endpoint.url = 'https://www.foo.bar'
       expect(endpoint.to_s).to eql('https://www.foo.bar')
     end
 
-    it "returns a blank string if the url is not set" do
-      expect(endpoint.to_s).to eql('')
+    it "returns a blank string with no ems and no url" do
+      expect(endpoint.to_s).to eql("")
+    end
+
+    it "returns a custom url with vmware uri set" do
+      ems = FactoryGirl.create(:ems_vmware, :hostname => 'example.com', :port => 443, :api_version => 5.5)
+      endpoint = FactoryGirl.create(:endpoint, :resource => ems)
+      expect(endpoint.to_s).to eql("vmwarews://example.com:443/5.5/?verify_ssl=true")
     end
   end
 end