neko/internal/api/utils/error.go

package utils

import (
	"net/http"

	"github.com/go-chi/render"
)

//--
// Error response payloads & renderers
//--

// ErrResponse renderer type for handling all sorts of errors.
//
// In the best case scenario, the excellent github.com/pkg/errors package
// helps reveal information on the error, setting it on Err, and in the Render()
// method, using it to set the application-specific error code in AppCode.
type ErrResponse struct {
	Err            error `json:"-"` // low-level runtime error
	HTTPStatusCode int   `json:"-"` // http response status code

	StatusText string `json:"status"`          // user-level status message
	AppCode    int64  `json:"code,omitempty"`  // application-specific error code
	ErrorText  string `json:"error,omitempty"` // application-level error message, for debugging
}

func (e *ErrResponse) Render(w http.ResponseWriter, r *http.Request) error {
	render.Status(r, e.HTTPStatusCode)
	return nil
}

func ErrMessage(HTTPStatusCode int, StatusText string) render.Renderer {
	return &ErrResponse{
		HTTPStatusCode: HTTPStatusCode,
		StatusText:     StatusText,
	}
}

func ErrBadRequest(err error) render.Renderer {
	return &ErrResponse{
		Err:            err,
		HTTPStatusCode: 400,
		StatusText:     "Bad request.",
		ErrorText:      err.Error(),
	}
}

func ErrUnprocessableEntity(err error) render.Renderer {
	return &ErrResponse{
		Err:            err,
		HTTPStatusCode: 400,
		StatusText:     "Unprocessable Entity.",
		ErrorText:      err.Error(),
	}
}

func ErrInternalServer(err error) render.Renderer {
	return &ErrResponse{
		Err:            err,
		HTTPStatusCode: 500,
		StatusText:     "Internal server error.",
		ErrorText:      err.Error(),
	}
}

func ErrNot(err error) render.Renderer {
	return &ErrResponse{
		Err:            err,
		HTTPStatusCode: 422,
		StatusText:     "Error rendering response.",
		ErrorText:      err.Error(),
	}
}

var ErrNotAuthenticated = &ErrResponse{
	HTTPStatusCode: 401,
	StatusText: "Invalid or missing access token.",
}

var ErrNotAuthorized = &ErrResponse{
	HTTPStatusCode: 403,
	StatusText: "Access token does not have the required scope.",
}

var ErrNotFound = &ErrResponse{
	HTTPStatusCode: 404,
	StatusText: "Resource not found.",
}