feat: improve content protection during file operations (#10378)

* feat: improve content protection during file operations

- Add validation for knowledge base configuration before saving
- Enhance error handling for note content reading
- Implement content backup and restoration during file rename
- Add content verification after rename operations
- Improve user feedback with specific error messages

* fix: format check

---------

Co-authored-by: 自由的世界人 <3196812536@qq.com>

src/renderer/src/components/Popups/SaveToKnowledgePopup.tsx

@@ -253,12 +253,39 @@ const PopupContainer: React.FC<Props> = ({ source, title, resolve }) => {
     let savedCount = 0
 
     try {
+      // Validate knowledge base configuration before proceeding
+      if (!selectedBaseId) {
+        throw new Error('No knowledge base selected')
+      }
+
+      const selectedBase = bases.find((base) => base.id === selectedBaseId)
+      if (!selectedBase) {
+        throw new Error('Selected knowledge base not found')
+      }
+
+      if (!selectedBase.version) {
+        throw new Error('Knowledge base is not properly configured. Please check the knowledge base settings.')
+      }
+
       if (isNoteMode) {
         const note = source.data as NotesTreeNode
-        const content = note.externalPath
-          ? await window.api.file.readExternal(note.externalPath)
-          : await window.api.file.read(note.id + '.md')
-        logger.debug('Note content:', content)
+        if (!note.externalPath) {
+          throw new Error('Note external path is required for export')
+        }
+
+        let content = ''
+        try {
+          content = await window.api.file.readExternal(note.externalPath)
+        } catch (error) {
+          logger.error('Failed to read note file:', error as Error)
+          throw new Error('Failed to read note content. Please ensure the file exists and is accessible.')
+        }
+
+        if (!content || content.trim() === '') {
+          throw new Error('Note content is empty. Cannot export empty notes to knowledge base.')
+        }
+
+        logger.debug('Note content loaded', { contentLength: content.length })
         await addNote(content)
         savedCount = 1
       } else {
@@ -283,9 +310,23 @@ const PopupContainer: React.FC<Props> = ({ source, title, resolve }) => {
       resolve({ success: true, savedCount })
     } catch (error) {
       logger.error('save failed:', error as Error)
-      window.toast.error(
-        t(isTopicMode ? 'chat.save.topic.knowledge.error.save_failed' : 'chat.save.knowledge.error.save_failed')
+
+      // Provide more specific error messages
+      let errorMessage = t(
+        isTopicMode ? 'chat.save.topic.knowledge.error.save_failed' : 'chat.save.knowledge.error.save_failed'
       )
+
+      if (error instanceof Error) {
+        if (error.message.includes('not properly configured')) {
+          errorMessage = error.message
+        } else if (error.message.includes('empty')) {
+          errorMessage = error.message
+        } else if (error.message.includes('read note content')) {
+          errorMessage = error.message
+        }
+      }
+
+      window.toast.error(errorMessage)
       setLoading(false)
     }
   }

src/renderer/src/pages/notes/NotesPage.tsx

@@ -492,10 +492,42 @@ const NotesPage: FC = () => {
 
         if (node && node.name !== newName) {
           const oldExternalPath = node.externalPath
+          let currentContent = ''
+
+          // Save current content before rename to prevent content loss
+          if (node.type === 'file' && activeFilePath === oldExternalPath) {
+            // Get content from editor or current cache
+            currentContent = editorRef.current?.getMarkdown() || lastContentRef.current || currentContent
+
+            // Save current content to the file before renaming
+            if (currentContent.trim()) {
+              try {
+                await saveCurrentNote(currentContent, oldExternalPath)
+              } catch (error) {
+                logger.warn('Failed to save content before rename:', error as Error)
+              }
+            }
+          }
+
           const renamedNode = await renameNode(nodeId, newName)
 
           if (renamedNode.type === 'file' && activeFilePath === oldExternalPath) {
+            // Restore content to the new file path if content was lost during rename
+            if (currentContent.trim()) {
+              try {
+                const newFileContent = await window.api.file.readExternal(renamedNode.externalPath)
+                if (!newFileContent || newFileContent.trim() === '') {
+                  await window.api.file.write(renamedNode.externalPath, currentContent)
+                  logger.info('Restored content to renamed file')
+                }
+              } catch (error) {
+                logger.error('Failed to restore content after rename:', error as Error)
+              }
+            }
+
             dispatch(setActiveFilePath(renamedNode.externalPath))
+            // Invalidate cache for the new path to ensure content is loaded correctly
+            invalidateFileContent(renamedNode.externalPath)
           } else if (
             renamedNode.type === 'folder' &&
             activeFilePath &&
@@ -504,6 +536,8 @@ const NotesPage: FC = () => {
             const relativePath = activeFilePath.substring(oldExternalPath.length)
             const newFilePath = renamedNode.externalPath + relativePath
             dispatch(setActiveFilePath(newFilePath))
+            // Invalidate cache for the new file path after folder rename
+            invalidateFileContent(newFilePath)
           }
           await sortAllLevels(sortType)
           if (renamedNode.name !== newName) {
@@ -518,7 +552,7 @@ const NotesPage: FC = () => {
         }, 500)
       }
     },
-    [activeFilePath, dispatch, findNodeById, sortType, t]
+    [activeFilePath, dispatch, findNodeById, sortType, t, invalidateFileContent, saveCurrentNote]
   )
 
   // 处理文件上传