choerodon-ui/es/rc-components/upload/attr-accept.js

An enterprise-class UI design language and React-based implementation

function endsWith(str, suffix) {
  return str.indexOf(suffix, str.length - suffix.length) !== -1;
}

export default (function (file, acceptedFiles) {
  if (file && acceptedFiles) {
    var acceptedFilesArray = Array.isArray(acceptedFiles) ? acceptedFiles : acceptedFiles.split(',');
    var fileName = file.name || '';
    var mimeType = file.type || '';
    var baseMimeType = mimeType.replace(/\/.*$/, '');
    return acceptedFilesArray.some(function (type) {
      var validType = type.trim();

      if (validType.charAt(0) === '.') {
        return endsWith(fileName.toLowerCase(), validType.toLowerCase());
      } else if (/\/\*$/.test(validType)) {
        // This is something like a image/* mime type
        return baseMimeType === validType.replace(/\/.*$/, '');
      }

      return mimeType === validType;
    });
  }

  return true;
});
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