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/default.ts

@@ -0,0 +1,46 @@
+import { BlockEnum } from '../../types'
+import type { NodeDefault } from '../../types'
+import { type AssignerNodeType, WriteMode } from './types'
+import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/constants'
+const i18nPrefix = 'workflow.errorMsg'
+
+const nodeDefault: NodeDefault<AssignerNodeType> = {
+  defaultValue: {
+    assigned_variable_selector: [],
+    write_mode: WriteMode.Overwrite,
+    input_variable_selector: [],
+  },
+  getAvailablePrevNodes(isChatMode: boolean) {
+    const nodes = isChatMode
+      ? ALL_CHAT_AVAILABLE_BLOCKS
+      : ALL_COMPLETION_AVAILABLE_BLOCKS.filter(type => type !== BlockEnum.End)
+    return nodes
+  },
+  getAvailableNextNodes(isChatMode: boolean) {
+    const nodes = isChatMode ? ALL_CHAT_AVAILABLE_BLOCKS : ALL_COMPLETION_AVAILABLE_BLOCKS
+    return nodes
+  },
+  checkValid(payload: AssignerNodeType, t: any) {
+    let errorMessages = ''
+    const {
+      assigned_variable_selector: assignedVarSelector,
+      write_mode: writeMode,
+      input_variable_selector: toAssignerVarSelector,
+    } = payload
+
+    if (!errorMessages && !assignedVarSelector?.length)
+      errorMessages = t(`${i18nPrefix}.fieldRequired`, { field: t('workflow.nodes.assigner.assignedVariable') })
+
+    if (!errorMessages && writeMode !== WriteMode.Clear) {
+      if (!toAssignerVarSelector?.length)
+        errorMessages = t(`${i18nPrefix}.fieldRequired`, { field: t('workflow.nodes.assigner.variable') })
+    }
+
+    return {
+      isValid: !errorMessages,
+      errorMessage: errorMessages,
+    }
+  },
+}
+
+export default nodeDefault