feat(core): preprocessor schema & workflow validation

mx-interpreter/preprocessor.ts

@@ -0,0 +1,50 @@
+import Joi from 'joi';
+import {
+  Workflow, WorkflowFile, ParamType, SelectorArray, Where,
+} from './types/workflow';
+import { operators } from './types/logic';
+
+/**
+* Class for static processing the workflow files/objects.
+*/
+export default class Preprocessor {
+  static validateWorkflow(workflow: WorkflowFile) : any {
+    const regex = Joi.object({
+      $regex: Joi.string().required(),
+    });
+
+    const whereSchema = Joi.object({
+      url: [Joi.string().uri(), regex],
+      selectors: Joi.array().items(Joi.string()),
+      cookies: Joi.object({}).pattern(Joi.string(), Joi.string()),
+      $after: [Joi.string(), regex],
+      $before: [Joi.string(), regex],
+      $and: Joi.array().items(Joi.link('#whereSchema')),
+      $or: Joi.array().items(Joi.link('#whereSchema')),
+      $not: Joi.link('#whereSchema'),
+    }).id('whereSchema');
+
+    const schema = Joi.object({
+      meta: Joi.object({
+        name: Joi.string(),
+        desc: Joi.string(),
+      }),
+      workflow: Joi.array().items(
+        Joi.object({
+          id: Joi.string(),
+          where: whereSchema.required(),
+          what: Joi.array().items({
+            action: Joi.string().required(),
+            args: Joi.array().items(Joi.any()),
+          }).required(),
+        }),
+      ).required(),
+    });
+
+    const { error } = schema.validate(workflow);
+
+    return error;
+  }
+
+ 
+}