Feat: conversation variable & variable assigner node (#7222)

Signed-off-by: -LAN- <laipz8200@outlook.com>
Co-authored-by: Joel <iamjoel007@gmail.com>
Co-authored-by: -LAN- <laipz8200@outlook.com>

web/app/components/workflow/nodes/assigner/node.tsx

@@ -0,0 +1,47 @@
+import type { FC } from 'react'
+import React from 'react'
+import { useNodes } from 'reactflow'
+import { useTranslation } from 'react-i18next'
+import NodeVariableItem from '../variable-assigner/components/node-variable-item'
+import { type AssignerNodeType } from './types'
+import { isConversationVar, isENV, isSystemVar } from '@/app/components/workflow/nodes/_base/components/variable/utils'
+import { BlockEnum, type Node, type NodeProps } from '@/app/components/workflow/types'
+
+const i18nPrefix = 'workflow.nodes.assigner'
+
+const NodeComponent: FC<NodeProps<AssignerNodeType>> = ({
+  data,
+}) => {
+  const { t } = useTranslation()
+
+  const nodes: Node[] = useNodes()
+  const { assigned_variable_selector: variable, write_mode: writeMode } = data
+
+  if (!variable || variable.length === 0)
+    return null
+
+  const isSystem = isSystemVar(variable)
+  const isEnv = isENV(variable)
+  const isChatVar = isConversationVar(variable)
+
+  const node = isSystem ? nodes.find(node => node.data.type === BlockEnum.Start) : nodes.find(node => node.id === variable[0])
+  const varName = isSystem ? `sys.${variable[variable.length - 1]}` : variable.slice(1).join('.')
+  return (
+    <div className='relative px-3'>
+      <div className='mb-1 system-2xs-medium-uppercase text-text-tertiary'>{t(`${i18nPrefix}.assignedVariable`)}</div>
+      <NodeVariableItem
+        node={node as Node}
+        isEnv={isEnv}
+        isChatVar={isChatVar}
+        varName={varName}
+        className='bg-workflow-block-parma-bg'
+      />
+      <div className='my-2 flex justify-between items-center h-[22px] px-[5px] bg-workflow-block-parma-bg radius-sm'>
+        <div className='system-xs-medium-uppercase text-text-tertiary'>{t(`${i18nPrefix}.writeMode`)}</div>
+        <div className='system-xs-medium text-text-secondary'>{t(`${i18nPrefix}.${writeMode}`)}</div>
+      </div>
+    </div>
+  )
+}
+
+export default React.memo(NodeComponent)