feat(api-errors): error factories (#1)

packages/xo-common/package.json

@@ -25,7 +25,8 @@
   },
   "dependencies": {
     "babel-runtime": "^6.18.0",
-    "lodash": "^4.16.6"
+    "lodash": "^4.16.6",
+    "make-error": "^1.2.1"
   },
   "devDependencies": {
     "babel-cli": "^6.18.0",

packages/xo-common/src/api-errors.js

@@ -0,0 +1,79 @@
+import { BaseError } from 'make-error'
+import { isArray, iteratee } from 'lodash'
+
+class XoError extends BaseError {
+  constructor ({ code, message, data }) {
+    super(message)
+    this.code = code
+    this.data = data
+  }
+
+  toJsonRpcError () {
+    return {
+      message: this.message,
+      code: this.code,
+      data: this.data
+    }
+  }
+}
+
+const create = (code, getProps) => {
+  const factory = args => new XoError({ ...getProps(args), code })
+  factory.is = (error, predicate) =>
+    error.code === code && iteratee(predicate)(error)
+
+  return factory
+}
+
+// =============================================================================
+
+export const notImplemented = create(0, () => ({
+  message: 'not implemented'
+}))
+
+export const noSuchObject = create(1, (id, type) => ({
+  data: { id, type },
+  message: 'no such object'
+}))
+
+export const unauthorized = create(2, () => ({
+  message: 'not authenticated or not enough permissions'
+}))
+
+export const invalidCredentials = create(3, () => ({
+  message: 'invalid credentials'
+}))
+
+// Deprecated alreadyAuthenticated (4)
+
+export const forbiddenOperation = create(5, (operation, reason) => ({
+  data: { operation, reason },
+  message: `forbidden operation: ${operation}`
+}))
+
+// Deprecated GenericError (6)
+
+export const noHostsAvailable = create(7, () => ({
+  message: 'no hosts available'
+}))
+
+export const authenticationFailed = create(8, () => ({
+  message: 'authentication failed'
+}))
+
+export const hostUnreached = create(9, id => ({
+  data: { id },
+  message: 'host unreached'
+}))
+
+export const invalidParameters = create(10, (message, errors) => {
+  if (isArray(message)) {
+    errors = message
+    message = undefined
+  }
+
+  return {
+    data: { errors },
+    message: message || 'invalid parameters'
+  }
+})