65 lines
4.4 KiB
Plaintext
65 lines
4.4 KiB
Plaintext
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import { API_BASE_URL, getSession, clearSession } from '@/services/api.uts'
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import { APP_ENVIRONMENT } from '@/services/config.uts'
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export type ReportDownload = { cancel: () => void, done: Promise<string> }
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export function downloadReportPdf(id: string): ReportDownload {
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// 首版仅开放普通浏览器H5；其他端明确提示，不生成假文件或成功回执。
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// #ifndef H5
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return { cancel: () => {}, done: new Promise<string>((_resolve, reject) => { reject(new Error('当前客户端暂未开放PDF下载，请在普通浏览器打开H5并登录后下载。')) }) }
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// #endif
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// #ifdef H5
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const controller = new AbortController()
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let cancelled = false
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const cancel = () => { cancelled = true; controller.abort() }
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const done = async (): Promise<string> => {
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if (!/^[1-9][0-9]{0,9}$/.test(id)) throw new Error('报告编号无效，请重新打开本人报告。')
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if (/MicroMessenger/i.test(navigator.userAgent)) throw new Error('微信内浏览器暂不支持此下载。请点右上角菜单，选择“在浏览器打开”，登录后重新点击下载PDF。')
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const token = getSession()?.getString('token') ?? ''
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if (token.length == 0) throw new Error('登录已过期，请重新登录后下载。')
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if (API_BASE_URL.length == 0 || (APP_ENVIRONMENT == 'production' && !API_BASE_URL.startsWith('https://'))) throw new Error('下载服务地址尚未配置。')
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const current = () => {
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if (cancelled || getSession()?.getString('token') != token) throw new Error('页面或登录状态已变化，本次下载已取消。')
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}
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const timeout = setTimeout(() => controller.abort(), 45000)
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try {
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const response = await fetch(API_BASE_URL + '/assessments/' + id + '/report.pdf', {
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method: 'GET', headers: { Authorization: 'Bearer ' + token, 'X-Requested-With': 'XMLHttpRequest' },
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cache: 'no-store', credentials: 'omit', redirect: 'error', signal: controller.signal
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})
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current()
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if (response.status == 401) { clearSession(); throw new Error('登录已过期，请重新登录后下载。') }
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const mime = (response.headers.get('Content-Type') ?? '').split(';')[0].trim().toLowerCase()
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if (!response.ok || mime != 'application/pdf') {
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let message = 'PDF暂不可下载，请稍后重试；已保存报告不受影响。'
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if (mime == 'application/json') {
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const body = await response.json()
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if (typeof body.msg == 'string' && body.msg.length > 0 && body.msg.length < 200) message = body.msg
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}
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current(); throw new Error(message)
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}
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const declaredSize = Number(response.headers.get('Content-Length') ?? '0')
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if (declaredSize > 20971520) throw new Error('PDF文件过大，请联系管理员。')
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const bytes = await response.arrayBuffer()
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current()
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const start = new TextDecoder('ascii').decode(bytes.slice(0, 5))
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const end = new TextDecoder('ascii').decode(bytes.slice(Math.max(0, bytes.byteLength - 1024)))
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if (bytes.byteLength < 100 || bytes.byteLength > 20971520 || start != '%PDF-' || !end.includes('%%EOF')) throw new Error('下载内容不是完整PDF，请重试。')
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// 验证响应后才创建本机Blob。令牌只放请求头，不写URL、文件名或本机存储。
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const url = URL.createObjectURL(new Blob([bytes], { type: 'application/pdf' }))
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const link = document.createElement('a')
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link.href = url; link.download = 'financing-report-' + id + '.pdf'; link.style.display = 'none'
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document.body.appendChild(link); link.click(); link.remove()
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setTimeout(() => URL.revokeObjectURL(url), 1000)
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return 'PDF已交给浏览器处理，请查看下载列表；若打开预览，可使用浏览器的保存功能。'
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} catch (err) {
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if (cancelled) throw new Error('下载已取消。')
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if (controller.signal.aborted) throw new Error('PDF生成超时，请稍后重试。')
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if (err instanceof TypeError) throw new Error('网络连接失败，请检查网络后重试。')
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throw err
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} finally { clearTimeout(timeout) }
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}
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return { cancel, done: done() }
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// #endif
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}
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