【功能新增】AI：知识库文档上传：20%，UploadStep 基本搭建出来

src/utils/index.ts

@@ -116,6 +116,64 @@ export function toAnyString() {
   return str
 }
 
+/**
+ * 根据支持的文件类型生成 accept 属性值
+ * 
+ * @param supportedFileTypes 支持的文件类型数组，如 ['PDF', 'DOC', 'DOCX']
+ * @returns 用于文件上传组件 accept 属性的字符串
+ */
+export const generateAcceptedFileTypes = (supportedFileTypes: string[]): string => {
+  const allowedExtensions = supportedFileTypes.map((ext) => ext.toLowerCase())
+  const mimeTypes: string[] = []
+
+  // 添加常见的 MIME 类型映射
+  if (allowedExtensions.includes('txt')) {
+    mimeTypes.push('text/plain')
+  }
+  if (allowedExtensions.includes('pdf')) {
+    mimeTypes.push('application/pdf')
+  }
+  if (allowedExtensions.includes('html') || allowedExtensions.includes('htm')) {
+    mimeTypes.push('text/html')
+  }
+  if (allowedExtensions.includes('csv')) {
+    mimeTypes.push('text/csv')
+  }
+  if (allowedExtensions.includes('xlsx') || allowedExtensions.includes('xls')) {
+    mimeTypes.push('application/vnd.ms-excel')
+    mimeTypes.push('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
+  }
+  if (allowedExtensions.includes('docx') || allowedExtensions.includes('doc')) {
+    mimeTypes.push('application/msword')
+    mimeTypes.push('application/vnd.openxmlformats-officedocument.wordprocessingml.document')
+  }
+  if (allowedExtensions.includes('pptx') || allowedExtensions.includes('ppt')) {
+    mimeTypes.push('application/vnd.ms-powerpoint')
+    mimeTypes.push('application/vnd.openxmlformats-officedocument.presentationml.presentation')
+  }
+  if (allowedExtensions.includes('xml')) {
+    mimeTypes.push('application/xml')
+    mimeTypes.push('text/xml')
+  }
+  if (allowedExtensions.includes('md') || allowedExtensions.includes('markdown')) {
+    mimeTypes.push('text/markdown')
+  }
+  if (allowedExtensions.includes('epub')) {
+    mimeTypes.push('application/epub+zip')
+  }
+  if (allowedExtensions.includes('eml')) {
+    mimeTypes.push('message/rfc822')
+  }
+  if (allowedExtensions.includes('msg')) {
+    mimeTypes.push('application/vnd.ms-outlook')
+  }
+
+  // 添加文件扩展名
+  const extensions = allowedExtensions.map((ext) => `.${ext}`)
+
+  return [...mimeTypes, ...extensions].join(',')
+}
+
 /**
  * 首字母大写
  */