parameter binding rewrite

Reorganized the code a bit, so that runtime requirements
are in the package "runtime".

Parameters in swagger are freakishly complicated, and this is
a pretty robust implementation that parses most of the
supported types. We limit ourselves to form styled query
parameters, since Content parameters can describe anything
else.

Author: mromaszewicz

oapi_validate.go

@@ -35,7 +35,7 @@ func OapiValidatorFromYamlFile(path string) (echo.MiddlewareFunc, error) {
 		return nil, fmt.Errorf("error reading %s: %s", path, err)
 	}
 
-	swagger, err := openapi3.NewSwaggerLoader().LoadSwaggerFromYAMLData(data)
+	swagger, err := openapi3.NewSwaggerLoader().LoadSwaggerFromData(data)
 	if err != nil {
 		return nil, fmt.Errorf("error parsing %s as Swagger YAML: %s",
 			path, err)

oapi_validate_test.go

@@ -79,7 +79,7 @@ func doPost(t *testing.T, e *echo.Echo, url string, jsonBody interface{}) *httpt
 }
 
 func TestOapiRequestValidator(t *testing.T) {
-	swagger, err := openapi3.NewSwaggerLoader().LoadSwaggerFromYAMLData([]byte(testSchema))
+	swagger, err := openapi3.NewSwaggerLoader().LoadSwaggerFromData([]byte(testSchema))
 	assert.NoError(t, err, "Error initializing swagger")
 
 	// Create a new echo router
@@ -112,24 +112,20 @@ func TestOapiRequestValidator(t *testing.T) {
 	}
 
 	// Send an out-of-spec parameter
-	// TODO(marcin): limit checking for numbers is not yet working in
-	//   kin-openapi, they only check the string type. I either need to do
-	//   this myself, or patch their code.
-	//{
-	//	rec := doGet(t, e, "http://deepmap.ai/resource?id=500")
-	//	assert.Equal(t, http.StatusBadRequest, rec.Code)
-	//	assert.False(t, called, "Handler should not have been called")
-	//	called = false
-	//}
+	{
+		rec := doGet(t, e, "http://deepmap.ai/resource?id=500")
+		assert.Equal(t, http.StatusBadRequest, rec.Code)
+		assert.False(t, called, "Handler should not have been called")
+		called = false
+	}
 
 	// Send a bad parameter type
-	// TODO(marcin): type checking is currently not yet working in kin-openapi
-	//{
-	//	rec := doGet(t, e, "http://deepmap.ai/resource?id=foo")
-	//	assert.Equal(t, http.StatusBadRequest, rec.Code)
-	//	assert.False(t, called, "Handler should not have been called")
-	//    called = false
-	//}
+	{
+		rec := doGet(t, e, "http://deepmap.ai/resource?id=foo")
+		assert.Equal(t, http.StatusBadRequest, rec.Code)
+		assert.False(t, called, "Handler should not have been called")
+		called = false
+	}
 
 	// Add a handler for the POST message
 	e.POST("/resource", func(c echo.Context) error {