65 lines
1.9 KiB
TypeScript
65 lines
1.9 KiB
TypeScript
/**
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* 文件工具模块
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* 提供文件相关的实用函数
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*/
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/**
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* 从文件名中提取MIME类型
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* @param filename 文件名
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* @returns MIME类型字符串
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*/
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export function getMimeTypeFromFilename(filename: string): string {
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const baseFilename = filename.replace(/\.encrypted$/, '');
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// 提取原始扩展名
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const lastDotIndex = baseFilename.lastIndexOf('.');
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if (lastDotIndex === -1) {
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// 如果没有扩展名，默认返回image/png
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return 'image/png';
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}
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const extension = baseFilename.substring(lastDotIndex + 1).toLowerCase();
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// 扩展名到MIME类型的映射
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const mimeTypes: { [key: string]: string } = {
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// 图片格式
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'jpg': 'image/jpeg',
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'jpeg': 'image/jpeg',
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'png': 'image/png',
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'gif': 'image/gif',
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'webp': 'image/webp',
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'bmp': 'image/bmp',
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'svg': 'image/svg+xml',
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'ico': 'image/x-icon',
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'tiff': 'image/tiff',
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'tif': 'image/tiff',
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'avif': 'image/avif',
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// 视频格式
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'mp4': 'video/mp4',
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'webm': 'video/webm',
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'mkv': 'video/x-matroska',
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'avi': 'video/x-msvideo',
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'mov': 'video/quicktime',
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'flv': 'video/x-flv',
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'wmv': 'video/x-ms-wmv',
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'm4v': 'video/x-m4v'
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};
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return mimeTypes[extension] || 'image/png'; // 默认返回image/png
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}
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/**
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* Download a decrypted file (image or video) from a blob URL.
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* Strips the .encrypted suffix from the filename.
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* @param blobUrl Blob URL of the decrypted data
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* @param filename Original filename (with .encrypted suffix)
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*/
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export function downloadDecryptedFile(blobUrl: string, filename: string): void {
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const a = document.createElement("a");
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a.href = blobUrl;
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const originalFilename = filename.replace(/\.encrypted$/, "");
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a.download = originalFilename;
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document.body.appendChild(a);
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a.click();
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document.body.removeChild(a);
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}
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