fuse-code/src/utils/meta.ts

export enum MetaType {
  image = 'image',
  video = 'video',
  audio = 'audio',
  xfile = 'xfile',
  other = 'other'
}

export const metaTypeExtnames = {
  [MetaType.image]: ['bmp', 'jpg', 'jpeg', 'png', 'tif', 'gif', 'pcx', 'tga', 'exif', 'fpx', 'svg', 'psd', 'cdr', 'pcd', 'dxf', 'ufo', 'eps', 'ai', 'WMF', 'webp', 'avif', 'apng'],
  [MetaType.audio]: ['mp3'],
  [MetaType.video]: ['wmv', 'asf', 'asx', 'rm', 'rmvb', 'mp4', '3gp', 'mov', 'm4v', 'avi', 'dat', 'mkv', 'flv', 'vob'],
  [MetaType.xfile]: ["raw", "dcm"]
}

export const getExtname = (url: string) => {
  const index = url.lastIndexOf('.')
  if (~index) {
    return url.substring(index + 1)
  } else {
    return null
  }
}

export const getUrlType = (url: string) => {
  if (url.includes(';base64')) {
    const type = url.substring(url.indexOf(':') + 1, url.indexOf('/'))
    if (type === 'image') {
      return MetaType.image
    } else if (type === 'video') {
      return MetaType.video
    } else if (type === 'audio') {
      return MetaType.audio
    } else if (type === 'raw' || type === 'dcm') {
      return MetaType.xfile
    } else {
      return MetaType.other
    }
  }

  const extname = getExtname(url)?.toLowerCase()
  if (extname) {
    for (const [type, extnames] of Object.entries(metaTypeExtnames)) {
      if (extnames.includes(extname)) {
        return type as MetaType
      }
    }
    return MetaType.other
  } else {
    return MetaType.other
  }
}