feat: the frontend part of mcp (#22131)

Co-authored-by: jZonG <jzongcode@gmail.com>
Co-authored-by: Novice <novice12185727@gmail.com>
Co-authored-by: nite-knite <nkCoding@gmail.com>
Co-authored-by: Hanqing Zhao <sherry9277@gmail.com>

web/app/components/workflow/nodes/tool/components/mixed-variable-text-input/index.tsx

@@ -0,0 +1,62 @@
+import {
+  memo,
+} from 'react'
+import { useTranslation } from 'react-i18next'
+import PromptEditor from '@/app/components/base/prompt-editor'
+import Placeholder from './placeholder'
+import type {
+  Node,
+  NodeOutPutVar,
+} from '@/app/components/workflow/types'
+import { BlockEnum } from '@/app/components/workflow/types'
+import cn from '@/utils/classnames'
+
+type MixedVariableTextInputProps = {
+  readOnly?: boolean
+  nodesOutputVars?: NodeOutPutVar[]
+  availableNodes?: Node[]
+  value?: string
+  onChange?: (text: string) => void
+}
+const MixedVariableTextInput = ({
+  readOnly = false,
+  nodesOutputVars,
+  availableNodes = [],
+  value = '',
+  onChange,
+}: MixedVariableTextInputProps) => {
+  const { t } = useTranslation()
+  return (
+    <PromptEditor
+      wrapperClassName={cn(
+        'w-full rounded-lg border border-transparent bg-components-input-bg-normal px-2 py-1',
+        'hover:border-components-input-border-hover hover:bg-components-input-bg-hover',
+        'focus-within:border-components-input-border-active focus-within:bg-components-input-bg-active focus-within:shadow-xs',
+      )}
+      className='caret:text-text-accent'
+      editable={!readOnly}
+      value={value}
+      workflowVariableBlock={{
+        show: true,
+        variables: nodesOutputVars || [],
+        workflowNodesMap: availableNodes.reduce((acc, node) => {
+          acc[node.id] = {
+            title: node.data.title,
+            type: node.data.type,
+          }
+          if (node.data.type === BlockEnum.Start) {
+            acc.sys = {
+              title: t('workflow.blocks.start'),
+              type: BlockEnum.Start,
+            }
+          }
+          return acc
+        }, {} as any),
+      }}
+      placeholder={<Placeholder />}
+      onChange={onChange}
+    />
+  )
+}
+
+export default memo(MixedVariableTextInput)

web/app/components/workflow/nodes/tool/components/mixed-variable-text-input/placeholder.tsx

@@ -0,0 +1,51 @@
+import { useCallback } from 'react'
+import { useTranslation } from 'react-i18next'
+import { useLexicalComposerContext } from '@lexical/react/LexicalComposerContext'
+import { FOCUS_COMMAND } from 'lexical'
+import { $insertNodes } from 'lexical'
+import { CustomTextNode } from '@/app/components/base/prompt-editor/plugins/custom-text/node'
+import Badge from '@/app/components/base/badge'
+
+const Placeholder = () => {
+  const { t } = useTranslation()
+  const [editor] = useLexicalComposerContext()
+
+  const handleInsert = useCallback((text: string) => {
+    editor.update(() => {
+      const textNode = new CustomTextNode(text)
+      $insertNodes([textNode])
+    })
+    editor.dispatchCommand(FOCUS_COMMAND, undefined as any)
+  }, [editor])
+
+  return (
+    <div
+      className='pointer-events-auto flex h-full w-full cursor-text items-center px-2'
+      onClick={(e) => {
+        e.stopPropagation()
+        handleInsert('')
+      }}
+    >
+      <div className='flex grow items-center'>
+        {t('workflow.nodes.tool.insertPlaceholder1')}
+        <div className='system-kbd mx-0.5 flex h-4 w-4 items-center justify-center rounded bg-components-kbd-bg-gray text-text-placeholder'>/</div>
+        <div
+          className='system-sm-regular cursor-pointer text-components-input-text-placeholder underline decoration-dotted decoration-auto underline-offset-auto hover:text-text-tertiary'
+          onClick={((e) => {
+            e.stopPropagation()
+            handleInsert('/')
+          })}
+        >
+          {t('workflow.nodes.tool.insertPlaceholder2')}
+        </div>
+      </div>
+      <Badge
+        className='shrink-0'
+        text='String'
+        uppercase={false}
+      />
+    </div>
+  )
+}
+
+export default Placeholder