response.go

package requestgen

import (
	"encoding/json"
	"io"
	"net/http"
)

// Response is wrapper for standard http.Response and provides
// more methods.
type Response struct {
	*http.Response

	// Body overrides the composited Body field.
	Body []byte
}

// NewResponse is a wrapper of the http.Response instance, it reads the response body and close the file.
func NewResponse(r *http.Response) (response *Response, err error) {
	body, err := io.ReadAll(r.Body)
	if err != nil {
		return nil, err
	}

	err = r.Body.Close()
	response = &Response{Response: r, Body: body}
	return response, err
}

// String converts response body to string.
// An empty string will be returned if error.
func (r *Response) String() string {
	return string(r.Body)
}

func (r *Response) DecodeJSON(o interface{}) error {
	// handle 204 - No Content
	if r.StatusCode == 204 && len(r.Body) == 0 {
		return nil
	}

	return json.Unmarshal(r.Body, o)
}

func (r *Response) IsError() bool {
	return r.StatusCode >= 400
}

func (r *Response) IsJSON() bool {
	switch r.Header.Get("content-type") {
	case "text/json", "application/json", "application/json; charset=utf-8":
		return true
	}
	return false
}

func (r *Response) IsHTML() bool {
	switch r.Header.Get("content-type") {
	case "text/html":
		return true
	}
	return false
}