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* Return extended error incl. statuscode, describing message and optional messages
*/
export class CustomError extends Error {
constructor(error) {
super(error.message);
this.name = error.name;
this.statusCode = error.statusCode || generateErrorStatusCode(error);
this.body = generateErrorBody(error);
this.isOperatinal = true;
Error.captureStackTrace(this, this.constructor);
}
}
/**
* generate status codes by error names
*/
const generateErrorStatusCode = (error) => {
switch (error.name) {
// VALIDATION ERROR
case "ValidationError":
case "JsonWebTokenError":
// ZOD VALIDATION ERROR
case "zodError": {
return 400;
}
// DEFAULT ERROR
default: {
return 500;
}
}
};
/**
* create and return a individual error body
*/
const generateErrorBody = (error) => {
switch (error.name) {
// MONGOOSE VALIDATION ERROR
case "ValidationError": {
let validationErrors = {};
Object.keys(error.errors).forEach((key) => {
validationErrors[key] = error.errors[key].message;
});
// return error body
return {
message: 'Validation errors. Please check the error messages.',
validationErrors
};
}
// ZOD VALIDATION ERROR
case "zodError": {
let formattedErrors = error.format();
// prepare object of all validation messages
let validationErrors = {};
// loop through all fields
Object.keys(formattedErrors).forEach((key) => {
// store field errors into messages
const messages = formattedErrors[key]._errors;
// if there are subkeys besides _errors
if (Object.keys(formattedErrors[key]).length > 1) {
// loop through subkeys
Object.keys(formattedErrors[key]).forEach((subkey) => {
// skip _errors, as it's handled above
if (subkey === "_errors") return;
// skip undefined
if (formattedErrors[key][subkey] == undefined) return;
// get entry number which throws the error
const entry = parseInt(subkey) + 1;
// add subkey to messages
messages.push(`Entry ${entry}: ${formattedErrors[key][subkey]._errors}`);
});
}
// store messages in validationErrors
if (messages !== undefined) validationErrors[key] = messages.join();
});
// return error body
return {
message: 'Validation errors. Please check the error messages.',
validationErrors
};
}
// DEFAULT ERROR
default: {
switch (error.statusCode) {
case 405:
// insufficient rights
return { message: 'Operation not permitted. Insufficient access rights.' };
default:
// OTHER ERROR
return { message: error.message };
}
}
}
};
/**
* used as middleware in router to fetch unknown routes
*/
export const middlewareUnknownRoute = (req, res, next) => {
const error = new Error(`Route ${req.originalUrl} not found`);
error.statusCode = 404;
next(error);
};
/**
* used as middleware in router to fetch and return errors
*/
export const middlewareErrorHandler = (error, req, res, next) => {
// console.error("🚀 ~ middlewareErrorHandler ~ error:", error);
console.error("🚀 ~ middlewareErrorHandler ~ error:", JSON.stringify(error));
const customError = new CustomError(error);
// return error to user
res.status(customError.statusCode).json(customError.body);
};
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