v3(services): Add link to parameters in service credential binding response

[#174086740](https://www.pivotaltracker.com/story/show/174086740)

Author: Brian Butz

app/presenters/v3/service_credential_binding_presenter.rb

@@ -67,14 +67,13 @@ def last_operation
 
           def base_links
             {
-              self: { href: url_builder.build_url(path: path_to_self) },
-              details: {
-                href: url_builder.build_url(path: "#{path_to_self}/details")
-              },
-              service_instance: {
-                href: url_builder.build_url(path: "/v3/service_instances/#{@resource.service_instance_guid}")
-              }
-            }
+              self: path_to_self,
+              details: "#{path_to_self}/details",
+              parameters: "#{path_to_self}/parameters",
+              service_instance: "/v3/service_instances/#{@resource.service_instance_guid}"
+            }.transform_values do |path|
+              hrefify(path)
+            end
           end
 
           def path_to_self
@@ -96,7 +95,11 @@ def app_relationship
           def app_link
             return {} if @resource.app_guid.blank?
 
-            { app: { href: url_builder.build_url(path: "/v3/apps/#{@resource.app_guid}") } }
+            { app: hrefify("/v3/apps/#{@resource.app_guid}") }
+          end
+
+          def hrefify(path)
+            { href: url_builder.build_url(path: path) }
           end
         end
       end

docs/v3/source/includes/api_resources/_service_credential_bindings.erb

@@ -30,6 +30,9 @@
     "details": {
       "href": "https://api.example.org/v3/service_bindings/dde5ad2a-d8f4-44dc-a56f-0452d744f1c3/details"
     },
+    "parameters": {
+      "href": "https://api.example.org/v3/service_bindings/dde5ad2a-d8f4-44dc-a56f-0452d744f1c3/parameters"
+    },
     "service_instance": {
       "href": "https://api.example.org/v3/service_instances/8bfe4c1b-9e18-45b1-83be-124163f31f9e"
     },
@@ -62,6 +65,9 @@
     "details": {
       "href": "https://api.example.org/v3/service_bindings/dde5ad2a-d8f4-44dc-a56f-0452d744f1c3/details"
     },
+    "parameters": {
+      "href": "https://api.example.org/v3/service_bindings/dde5ad2a-d8f4-44dc-a56f-0452d744f1c3/parameters"
+    },
     "service_instance": {
       "href": "https://api.example.org/v3/service_instances/8bfe4c1b-9e18-45b1-83be-124163f31f9e"
     }

spec/request/service_credential_bindings_spec.rb

@@ -887,6 +887,9 @@ def expected_json(binding)
         details: {
           href: "#{link_prefix}/v3/service_credential_bindings/#{binding.guid}/details"
         },
+        parameters: {
+          href: "#{link_prefix}/v3/service_credential_bindings/#{binding.guid}/parameters"
+        },
         service_instance: {
           href: "#{link_prefix}/v3/service_instances/#{binding.service_instance.guid}"
         }

spec/unit/presenters/v3/service_credential_binding_presenter_spec.rb

@@ -55,6 +55,9 @@ module CloudController
                 details: {
                   href: %r{.*/v3/service_credential_bindings/some-guid/details}
                 },
+                parameters: {
+                  href: %r{.*/v3/service_credential_bindings/some-guid/parameters}
+                },
                 app: {
                   href: %r{.*/v3/apps/app-guid}
                 },
@@ -106,6 +109,9 @@ module CloudController
                 details: {
                   href: %r{.*/v3/service_credential_bindings/some-guid/details}
                 },
+                parameters: {
+                  href: %r{.*/v3/service_credential_bindings/some-guid/parameters}
+                },
                 service_instance: {
                   href: %r{.*/v3/service_instances/instance-guid}
                 }