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import { fileDownload } from '@/api/modules/system/common';
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export function useUrlDownload(file: { url: string; filename?: string }) {
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/** 从 URL 截取兜底文件名 */
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function getFileNameFromUrl(url: string) {
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return url.split('/').pop() || url;
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}
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/** 从 Content-Disposition 中解析文件名（支持 filename* 与 filename） */
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function extractFileNameFromCD(cd?: string | null): string | undefined {
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if (!cd) return;
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// 1) 先处理 RFC5987 的 filename*
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const starMatch = /filename\*\s*=\s*([^;]+)/i.exec(cd);
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if (starMatch) {
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const value = starMatch[1].trim().replace(/^"(.*)"$/, '$1'); // 去掉首尾引号
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const rfc5987 = /^([^']*)'[^']*'(.*)$/.exec(value);
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if (rfc5987) {
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const encodedPart = rfc5987[2];
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try {
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return decodeURIComponent(encodedPart);
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} catch (e) {
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console.log('无法解码 RFC5987 编码的文件名：', e);
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}
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} else {
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try {
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return decodeURIComponent(value);
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} catch (e) {
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console.log('无法解码 URL 编码的文件名:', e);
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}
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return value;
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}
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}
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// 2) 再处理普通 filename=
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const normalMatch = /filename\s*=\s*([^;]+)/i.exec(cd);
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if (normalMatch) {
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return normalMatch[1].trim().replace(/^"(.*)"$/, '$1');
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}
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}
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async function proxyDownload(url: string, filename?: string) {
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// 1. 通过代理接口拿到 AxiosResponse<Blob>
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const res = await fileDownload({ url });
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// 2. 从响应头中取 Content-Disposition
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const cd =
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(res.headers['content-disposition'] as string | undefined) ?? (res.headers['Content-Disposition'] as string | undefined);
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// 3. 计算最终文件名：前端传入 > 响应头 > URL > 'download'
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let finalName = filename;
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const cdName = extractFileNameFromCD(cd);
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if (!finalName && cdName) finalName = cdName;
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if (!finalName) finalName = getFileNameFromUrl(url) || 'download';
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// 4. 触发浏览器下载
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const blob = res.data as Blob;
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const objectUrl = URL.createObjectURL(blob);
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const a = document.createElement('a');
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a.style.display = 'none';
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a.href = objectUrl;
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a.download = finalName;
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document.body.appendChild(a);
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a.click();
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a.remove();
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setTimeout(() => URL.revokeObjectURL(objectUrl), 1000);
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}
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const { url, filename } = file;
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const name = filename || getFileNameFromUrl(url);
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// 统一走后端代理，解决跨域
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return proxyDownload(url, name);
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}
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