wip api-v3: add error handler middleware and custom error classes

website/src/libs/api-v3/errors.js

@@ -0,0 +1,51 @@
+'use strict';
+
+// Base class for custom application errors
+// It extends Error and capture the stack trace
+class CustomError extends Error {
+  constructor() {
+    super();
+    Error.captureStackTrace(this, this.constructor);
+  }
+};
+
+// NotAuthorized error with a 401 http error code
+// used when a request is not authorized
+class NotAuthorized extends CustomError {
+  constructor(customMessage) {
+    super();
+    this.name = this.constructor.name;
+    this.httpCode = 401;
+    this.message = customMessage || 'Not authorized.'
+  }
+};
+
+// BadRequest error with a 400 http error code
+// used for requests not formatted correctly
+// TODO use for validation errors too?
+class BadRequest extends CustomError {
+  constructor(customMessage) {
+    super();
+    this.name = this.constructor.name;
+    this.httpCode = 400;
+    this.message = customMessage || 'Bad request.'
+  }
+};
+
+// InternalError error with a 500 http error code
+// used when an unexpected, internal server error is thrown
+class InternalServerError extends CustomError {
+  constructor(customMessage) {
+    super();
+    this.name = this.constructor.name;
+    this.httpCode = 500;
+    this.message = customMessage || 'Internal server error.'
+  }
+};
+
+module.exports = {
+  CustomError,
+  NotAuthorized,
+  BadRequest,
+  InternalServerError
+};