add $vars and $flow to custom function

packages/components/src/utils.ts

@@ -5,7 +5,7 @@ import * as path from 'path'
 import { JSDOM } from 'jsdom'
 import { z } from 'zod'
 import { DataSource } from 'typeorm'
-import { ICommonObject, IDatabaseEntity, IMessage, INodeData } from './Interface'
+import { ICommonObject, IDatabaseEntity, IMessage, INodeData, IVariable } from './Interface'
 import { AES, enc } from 'crypto-js'
 import { ChatMessageHistory } from 'langchain/memory'
 import { AIMessage, HumanMessage, BaseMessage } from 'langchain/schema'
@@ -70,6 +70,22 @@ export const availableDependencies = [
     'weaviate-ts-client'
 ]
 
+export const defaultAllowBuiltInDep = [
+    'assert',
+    'buffer',
+    'crypto',
+    'events',
+    'http',
+    'https',
+    'net',
+    'path',
+    'querystring',
+    'timers',
+    'tls',
+    'url',
+    'zlib'
+]
+
 /**
  * Get base classes of components
  *
@@ -688,3 +704,57 @@ export const convertMultiOptionsToStringArray = (inputString: string): string[]
     }
     return ArrayString
 }
+
+/**
+ * Get variables
+ * @param {DataSource} appDataSource
+ * @param {IDatabaseEntity} databaseEntities
+ * @param {INodeData} nodeData
+ */
+export const getVars = async (appDataSource: DataSource, databaseEntities: IDatabaseEntity, nodeData: INodeData) => {
+    const variables = ((await appDataSource.getRepository(databaseEntities['Variable']).find()) as IVariable[]) ?? []
+
+    // override variables defined in overrideConfig
+    // nodeData.inputs.variables is an Object, check each property and override the variable
+    if (nodeData?.inputs?.vars) {
+        for (const propertyName of Object.getOwnPropertyNames(nodeData.inputs.vars)) {
+            const foundVar = variables.find((v) => v.name === propertyName)
+            if (foundVar) {
+                // even if the variable was defined as runtime, we override it with static value
+                foundVar.type = 'static'
+                foundVar.value = nodeData.inputs.vars[propertyName]
+            } else {
+                // add it the variables, if not found locally in the db
+                variables.push({ name: propertyName, type: 'static', value: nodeData.inputs.vars[propertyName] })
+            }
+        }
+    }
+
+    return variables
+}
+
+/**
+ * Prepare sandbox variables
+ * @param {IVariable[]} variables
+ */
+export const prepareSandboxVars = (variables: IVariable[]) => {
+    let vars = {}
+    if (variables) {
+        for (const item of variables) {
+            let value = item.value
+
+            // read from .env file
+            if (item.type === 'runtime') {
+                value = process.env[item.name] ?? ''
+            }
+
+            Object.defineProperty(vars, item.name, {
+                enumerable: true,
+                configurable: true,
+                writable: true,
+                value: value
+            })
+        }
+    }
+    return vars
+}