index.js
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var statuses = require('statuses');
var inherits = require('inherits');
function toIdentifier(str) {
return str.split(' ').map(function (token) {
return token.slice(0, 1).toUpperCase() + token.slice(1)
}).join('').replace(/[^ _0-9a-z]/gi, '')
}
exports = module.exports = function httpError() {
// so much arity going on ~_~
var err;
var msg;
var status = 500;
var props = {};
for (var i = 0; i < arguments.length; i++) {
var arg = arguments[i];
if (arg instanceof Error) {
err = arg;
status = err.status || err.statusCode || status;
continue;
}
switch (typeof arg) {
case 'string':
msg = arg;
break;
case 'number':
status = arg;
break;
case 'object':
props = arg;
break;
}
}
if (typeof status !== 'number' || !statuses[status]) {
status = 500
}
// constructor
var HttpError = exports[status]
if (!err) {
// create error
err = HttpError
? new HttpError(msg)
: new Error(msg || statuses[status])
Error.captureStackTrace(err, httpError)
}
if (!HttpError || !(err instanceof HttpError)) {
// add properties to generic error
err.expose = status < 500
err.status = err.statusCode = status
}
for (var key in props) {
if (key !== 'status' && key !== 'statusCode') {
err[key] = props[key]
}
}
return err;
};
// create generic error objects
var codes = statuses.codes.filter(function (num) {
return num >= 400;
});
codes.forEach(function (code) {
var name = toIdentifier(statuses[code])
var className = name.match(/Error$/) ? name : name + 'Error'
if (code >= 500) {
var ServerError = function ServerError(msg) {
var self = new Error(msg != null ? msg : statuses[code])
Error.captureStackTrace(self, ServerError)
self.__proto__ = ServerError.prototype
Object.defineProperty(self, 'name', {
enumerable: false,
configurable: true,
value: className,
writable: true
})
return self
}
inherits(ServerError, Error);
ServerError.prototype.status =
ServerError.prototype.statusCode = code;
ServerError.prototype.expose = false;
exports[code] =
exports[name] = ServerError
return;
}
var ClientError = function ClientError(msg) {
var self = new Error(msg != null ? msg : statuses[code])
Error.captureStackTrace(self, ClientError)
self.__proto__ = ClientError.prototype
Object.defineProperty(self, 'name', {
enumerable: false,
configurable: true,
value: className,
writable: true
})
return self
}
inherits(ClientError, Error);
ClientError.prototype.status =
ClientError.prototype.statusCode = code;
ClientError.prototype.expose = true;
exports[code] =
exports[name] = ClientError
return;
});
// backwards-compatibility
exports["I'mateapot"] = exports.ImATeapot