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@eternalheart/ngx-file-preview

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A powerful Angular file preview component library supporting multiple file formats including images, videos, PDFs, Office documents, text files and more.

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export class PreviewUtils { static formatFileSize(bytes) { if (bytes === undefined || bytes === null) return '未知大小'; if (bytes === 0) return '0 B'; const units = ['B', 'KB', 'MB', 'GB', 'TB']; const k = 1024; const i = Math.floor(Math.log(bytes) / Math.log(k)); return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + units[i]; } static getFileType(file) { // 首先检查 MIME 类型 const mimeType = file.type.toLowerCase(); if (mimeType.startsWith('image/')) return 'image'; if (mimeType.startsWith('video/') || mimeType.includes('application/x-mpegURL') || mimeType.includes('application/vnd.apple.mpegurl')) return 'video'; if (mimeType.startsWith('audio/')) return 'audio'; // 检查文件扩展名 const extension = file.name.split('.').pop()?.toLowerCase(); return this.getFileTypeFromExtension(extension); } static getFileTypeFromUrl(url) { try { const extension = url.split('.').pop()?.toLowerCase(); return PreviewUtils.isBase64Url(url) ? "image" : this.getFileTypeFromExtension(extension); } catch { return 'unknown'; } } static isBase64Url(url) { return url.startsWith('data:'); } static getFileTypeFromExtension(extension) { if (!extension) return 'unknown'; switch (extension) { case 'jpg': case 'jpeg': case 'png': case 'gif': case 'bmp': case 'webp': return 'image'; case 'mp4': case 'webm': case 'ogg': case 'mov': case 'm3u8': case 'm3u': case 'ts': case 'avi': case 'wmv': case 'flv': case 'mkv': case '3gp': return 'video'; case 'mp3': case 'wav': return 'audio'; case 'pdf': return 'pdf'; case 'ppt': case 'pptx': return 'ppt'; case 'doc': case 'docx': return 'word'; case 'xls': case 'xlsx': return 'excel'; case 'txt': case 'json': return 'txt'; case 'md': return 'markdown'; case 'zip': case 'rar': case '7z': return 'zip'; default: return 'unknown'; } } /** * 转换为 PreviewFile 类型 */ static normalizeFiles(input) { // 转换为数组 const inputArray = Array.isArray(input) ? input : [input]; return inputArray.map(item => PreviewUtils.normalizeFile(item)); } static normalizeFile(input) { // 如果已经是 PreviewFile 类型,直接返回 if (PreviewUtils.isPreviewFile(input)) { return input; } // 如果是 File 对象 if (input instanceof File) { return { url: URL.createObjectURL(input), name: input.name, type: PreviewUtils.getFileType(input), size: input.size, lastModified: input.lastModified }; } // 如果是字符串 URL if (typeof input === 'string') { return { url: input, name: PreviewUtils.getFileNameFromUrl(input), type: PreviewUtils.getFileTypeFromUrl(input) }; } // 自推测类型 if (typeof input === 'object' && 'url' in input) { return { url: input.url, name: input.name, type: PreviewUtils.getFileTypeFromUrl(input.url) }; } throw new Error('Invalid file input'); } static isPreviewFile(input) { return typeof input === 'object' && 'url' in input && 'name' in input && 'type' in input; } static getFileNameFromUrl(url) { try { const urlObj = new URL(url); const pathname = urlObj.pathname; const fileName = pathname.split('/').pop(); return fileName || 'unknown'; } catch { return 'unknown'; } } } //# 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{PreviewFile, PreviewFileInput, PreviewType} from '../types/preview.types';\n\nexport class PreviewUtils {\n  static formatFileSize(bytes?: number): string {\n    if (bytes === undefined || bytes === null) return '未知大小';\n    if (bytes === 0) return '0 B';\n\n    const units = ['B', 'KB', 'MB', 'GB', 'TB'];\n    const k = 1024;\n    const i = Math.floor(Math.log(bytes) / Math.log(k));\n\n    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + units[i];\n  }\n\n  static getFileType(file: File): PreviewType {\n    // 首先检查 MIME 类型\n    const mimeType = file.type.toLowerCase();\n\n    if (mimeType.startsWith('image/')) return 'image';\n    if (mimeType.startsWith('video/') || mimeType.includes('application/x-mpegURL') || mimeType.includes('application/vnd.apple.mpegurl')) return 'video';\n    if (mimeType.startsWith('audio/')) return 'audio';\n\n    // 检查文件扩展名\n    const extension = file.name.split('.').pop()?.toLowerCase();\n    return this.getFileTypeFromExtension(extension);\n  }\n\n  static getFileTypeFromUrl(url: string): PreviewType {\n    try {\n      const extension = url.split('.').pop()?.toLowerCase();\n      return PreviewUtils.isBase64Url(url) ? \"image\" : this.getFileTypeFromExtension(extension);\n    } catch {\n      return 'unknown';\n    }\n  }\n\n  static isBase64Url(url: string): boolean {\n    return url.startsWith('data:');\n  }\n\n  private static getFileTypeFromExtension(extension?: string): PreviewType {\n    if (!extension) return 'unknown';\n\n    switch (extension) {\n      case 'jpg':\n      case 'jpeg':\n      case 'png':\n      case 'gif':\n      case 'bmp':\n      case 'webp':\n        return 'image';\n      case 'mp4':\n      case 'webm':\n      case 'ogg':\n      case 'mov':\n      case 'm3u8':\n      case 'm3u':\n      case 'ts':\n      case 'avi':\n      case 'wmv':\n      case 'flv':\n      case 'mkv':\n      case '3gp':\n        return 'video';\n      case 'mp3':\n      case 'wav':\n        return 'audio';\n      case 'pdf':\n        return 'pdf';\n      case 'ppt':\n      case 'pptx':\n        return 'ppt';\n      case 'doc':\n      case 'docx':\n        return 'word';\n      case 'xls':\n      case 'xlsx':\n        return 'excel';\n      case 'txt':\n      case 'json':\n        return 'txt';\n      case 'md':\n        return 'markdown';\n      case 'zip':\n      case 'rar':\n      case '7z':\n        return 'zip';\n\n      default:\n        return 'unknown';\n    }\n  }\n\n  /**\n   * 转换为 PreviewFile 类型\n   */\n  static normalizeFiles(input: PreviewFileInput): PreviewFile[] {\n    // 转换为数组\n    const inputArray = Array.isArray(input) ? input : [input];\n    return inputArray.map(item => PreviewUtils.normalizeFile(item));\n  }\n\n  static normalizeFile(input: PreviewFileInput): PreviewFile {\n    // 如果已经是 PreviewFile 类型，直接返回\n    if (PreviewUtils.isPreviewFile(input)) {\n      return input;\n    }\n\n    // 如果是 File 对象\n    if (input instanceof File) {\n      return {\n        url: URL.createObjectURL(input),\n        name: input.name,\n        type: PreviewUtils.getFileType(input),\n        size: input.size,\n        lastModified: input.lastModified\n      };\n    }\n\n    // 如果是字符串 URL\n    if (typeof input === 'string') {\n      return {\n        url: input,\n        name: PreviewUtils.getFileNameFromUrl(input),\n        type: PreviewUtils.getFileTypeFromUrl(input)\n      };\n    }\n    // 自推测类型\n    if (typeof input === 'object' && 'url' in input) {\n      return {\n        url: input.url as string,\n        name: input.name as string,\n        type: PreviewUtils.getFileTypeFromUrl(input.url as string)\n      }\n    }\n\n\n    throw new Error('Invalid file input');\n  }\n\n  static isPreviewFile(input: any): input is PreviewFile {\n    return typeof input === 'object' &&\n      'url' in input &&\n      'name' in input &&\n      'type' in input;\n  }\n\n  static getFileNameFromUrl(url: string): string {\n    try {\n      const urlObj = new URL(url);\n      const pathname = urlObj.pathname;\n      const fileName = pathname.split('/').pop();\n      return fileName || 'unknown';\n    } catch {\n      return 'unknown';\n    }\n  }\n\n}\n"]}