[go-server] Feat: add required assertions to models (#10068)

* Add RequiredError

* Add IsZeroValue helper

* Add AssertRequired method to all models

* Add AssertRequired call for body param

* Regenerate files

* Add DisallowUnknownFields

* Regenerate samples

* Use hasRequired in model to remove unnecessary code

* Revert disallowUnknownFields

* Use isAdditionalPropertiesTrue for disallowing unknown fields

* Updated samples

* Fix indent

* Add require checks for nested slices

* Add new tests

* Regenerate samples

* Regenerate samples after merging

samples/server/petstore/go-server-required/go/api.go

@@ -0,0 +1,100 @@
+/*
+ * OpenAPI Petstore
+ *
+ * This is a sample server Petstore server. For this sample, you can use the api key `special-key` to test the authorization filters.
+ *
+ * API version: 1.0.0
+ * Generated by: OpenAPI Generator (https://openapi-generator.tech)
+ */
+
+package petstoreserver
+
+import (
+	"context"
+	"net/http"
+	"os"
+)
+
+
+
+// PetApiRouter defines the required methods for binding the api requests to a responses for the PetApi
+// The PetApiRouter implementation should parse necessary information from the http request, 
+// pass the data to a PetApiServicer to perform the required actions, then write the service results to the http response.
+type PetApiRouter interface { 
+	AddPet(http.ResponseWriter, *http.Request)
+	DeletePet(http.ResponseWriter, *http.Request)
+	FindPetsByStatus(http.ResponseWriter, *http.Request)
+	// Deprecated
+	FindPetsByTags(http.ResponseWriter, *http.Request)
+	GetPetById(http.ResponseWriter, *http.Request)
+	UpdatePet(http.ResponseWriter, *http.Request)
+	UpdatePetWithForm(http.ResponseWriter, *http.Request)
+	UploadFile(http.ResponseWriter, *http.Request)
+}
+// StoreApiRouter defines the required methods for binding the api requests to a responses for the StoreApi
+// The StoreApiRouter implementation should parse necessary information from the http request, 
+// pass the data to a StoreApiServicer to perform the required actions, then write the service results to the http response.
+type StoreApiRouter interface { 
+	DeleteOrder(http.ResponseWriter, *http.Request)
+	GetInventory(http.ResponseWriter, *http.Request)
+	GetOrderById(http.ResponseWriter, *http.Request)
+	PlaceOrder(http.ResponseWriter, *http.Request)
+}
+// UserApiRouter defines the required methods for binding the api requests to a responses for the UserApi
+// The UserApiRouter implementation should parse necessary information from the http request, 
+// pass the data to a UserApiServicer to perform the required actions, then write the service results to the http response.
+type UserApiRouter interface { 
+	CreateUser(http.ResponseWriter, *http.Request)
+	CreateUsersWithArrayInput(http.ResponseWriter, *http.Request)
+	CreateUsersWithListInput(http.ResponseWriter, *http.Request)
+	DeleteUser(http.ResponseWriter, *http.Request)
+	GetUserByName(http.ResponseWriter, *http.Request)
+	LoginUser(http.ResponseWriter, *http.Request)
+	LogoutUser(http.ResponseWriter, *http.Request)
+	UpdateUser(http.ResponseWriter, *http.Request)
+}
+
+
+// PetApiServicer defines the api actions for the PetApi service
+// This interface intended to stay up to date with the openapi yaml used to generate it, 
+// while the service implementation can ignored with the .openapi-generator-ignore file 
+// and updated with the logic required for the API.
+type PetApiServicer interface { 
+	AddPet(context.Context, Pet) (ImplResponse, error)
+	DeletePet(context.Context, int64, string) (ImplResponse, error)
+	FindPetsByStatus(context.Context, []string) (ImplResponse, error)
+	// Deprecated
+	FindPetsByTags(context.Context, []string) (ImplResponse, error)
+	GetPetById(context.Context, int64) (ImplResponse, error)
+	UpdatePet(context.Context, Pet) (ImplResponse, error)
+	UpdatePetWithForm(context.Context, int64, string, string) (ImplResponse, error)
+	UploadFile(context.Context, int64, string, *os.File) (ImplResponse, error)
+}
+
+
+// StoreApiServicer defines the api actions for the StoreApi service
+// This interface intended to stay up to date with the openapi yaml used to generate it, 
+// while the service implementation can ignored with the .openapi-generator-ignore file 
+// and updated with the logic required for the API.
+type StoreApiServicer interface { 
+	DeleteOrder(context.Context, string) (ImplResponse, error)
+	GetInventory(context.Context) (ImplResponse, error)
+	GetOrderById(context.Context, int64) (ImplResponse, error)
+	PlaceOrder(context.Context, Order) (ImplResponse, error)
+}
+
+
+// UserApiServicer defines the api actions for the UserApi service
+// This interface intended to stay up to date with the openapi yaml used to generate it, 
+// while the service implementation can ignored with the .openapi-generator-ignore file 
+// and updated with the logic required for the API.
+type UserApiServicer interface { 
+	CreateUser(context.Context, User) (ImplResponse, error)
+	CreateUsersWithArrayInput(context.Context, []User) (ImplResponse, error)
+	CreateUsersWithListInput(context.Context, []User) (ImplResponse, error)
+	DeleteUser(context.Context, string) (ImplResponse, error)
+	GetUserByName(context.Context, string) (ImplResponse, error)
+	LoginUser(context.Context, string, string) (ImplResponse, error)
+	LogoutUser(context.Context) (ImplResponse, error)
+	UpdateUser(context.Context, string, User) (ImplResponse, error)
+}