feat(oa): export mobile PDF via upload and WeChat preview navigate

Co-authored-by: Cursor <cursoragent@cursor.com>

mobile-oa-h5/src/oa/print/exportOaApprovalPdf.js

@@ -5,6 +5,8 @@
  */
 import html2canvas from 'html2canvas'
 import { jsPDF } from 'jspdf'
+import { uploadAttachment, fetchAttachmentDownloadUrl } from '../../api/oa.js'
+import { attachmentFullUrl } from '../../utils/attachment.js'
 import { formatDeptDisplay } from '../kit/oa-dept-value.js'
 import { formatPersonDisplay } from '../kit/oa-person-value.js'
 import { formatIdNameDisplay } from '../../utils/id-name-value.js'
@@ -871,68 +873,110 @@ function isWeChatMiniWebView() {
   return false
 }
 
+function navigateToHostPdfPreview({ url, fileName }) {
+  const q =
+    'url=' +
+    encodeURIComponent(url) +
+    '&name=' +
+    encodeURIComponent(fileName || 'approval.pdf')
+  const path = '/pages/oa/pdf-preview/index?' + q
+  try {
+    if (typeof wx !== 'undefined' && wx.miniProgram?.navigateTo) {
+      wx.miniProgram.navigateTo({ url: path })
+      return true
+    }
+  } catch {
+    /* ignore */
+  }
+  try {
+    if (typeof uni !== 'undefined' && uni.webView?.navigateTo) {
+      uni.webView.navigateTo({ url: path })
+      return true
+    }
+  } catch {
+    /* ignore */
+  }
+  return false
+}
+
 /**
- * 打开可打印 HTML 并调用 window.print()。
- * @returns {Promise<{ ok: boolean, message?: string }>}
+ * @returns {Promise<{ ok: boolean, message?: string, mode?: 'preview' | 'download' }>}
  */
 export async function exportOaApprovalPdf(detail, opts = {}) {
   if (!detail) {
-    return { ok: false, message: '暂无审批详情，无法打印' }
+    return { ok: false, message: '暂无审批详情，无法导出 PDF' }
   }
 
-  const model = buildOaPrintModel(detail, {
-    printerName: opts.printerName || ''
-  })
-  const html = buildPrintHtml(model)
-
-  // 微信小程序 web-view 内系统打印能力普遍不可用
-  if (isWeChatMiniWebView()) {
-    return {
-      ok: false,
-      message: '微信内暂不支持系统打印，请用手机浏览器打开或到电脑端导出'
-    }
-  }
-
-  let frame = null
+  let blob
+  let filename
   try {
-    frame = document.createElement('iframe')
-    frame.setAttribute('title', 'oa-print')
-    frame.style.cssText =
-      'position:fixed;right:0;bottom:0;width:0;height:0;border:0;opacity:0;pointer-events:none;'
-    document.body.appendChild(frame)
-
-    const doc = frame.contentDocument || frame.contentWindow?.document
-    if (!doc || !frame.contentWindow) {
-      throw new Error('print frame unavailable')
-    }
-    doc.open()
-    doc.write(html)
-    doc.close()
-
-    await new Promise((r) => setTimeout(r, 80))
-    const win = frame.contentWindow
-    if (typeof win.print !== 'function') {
-      throw new Error('print not supported')
-    }
-    win.focus()
-    win.print()
-    return { ok: true }
+    ;({ blob, filename } = await generateOaApprovalPdfBlob(detail, opts))
   } catch (e) {
     return {
       ok: false,
-      message:
-        (e && e.message) ||
-        '当前环境无法调起打印，请用手机浏览器打开或到电脑端导出'
+      message: (e && e.message) || '生成 PDF 失败'
     }
-  } finally {
-    if (frame) {
-      setTimeout(() => {
-        try {
-          frame.remove()
-        } catch {
-          /* ignore */
+  }
+
+  if (isWeChatMiniWebView()) {
+    try {
+      const file = new File([blob], filename, { type: 'application/pdf' })
+      const res = await uploadAttachment(file)
+      const fileUrl = String(res?.fileUrl || res?.data?.fileUrl || '').trim()
+      if (!fileUrl) {
+        return { ok: false, message: '上传 PDF 失败：无文件地址' }
+      }
+
+      let openUrl = ''
+      try {
+        const dl = await fetchAttachmentDownloadUrl({
+          fileUrl,
+          fileName: filename
+        })
+        openUrl = String(dl?.downloadUrl || dl?.data?.downloadUrl || '').trim()
+      } catch {
+        /* fall through */
+      }
+      if (!openUrl) {
+        openUrl = attachmentFullUrl(fileUrl) || fileUrl
+      }
+      if (!/^https?:\/\//i.test(openUrl)) {
+        return { ok: false, message: '无法打开 PDF：下载地址无效' }
+      }
+
+      const navigated = navigateToHostPdfPreview({
+        url: openUrl,
+        fileName: filename
+      })
+      if (!navigated) {
+        return {
+          ok: false,
+          message: '无法跳转预览页，请升级微信后重试'
         }
-      }, 1500)
+      }
+      return { ok: true, mode: 'preview' }
+    } catch (e) {
+      return {
+        ok: false,
+        message: (e && e.message) || '上传或打开 PDF 失败'
+      }
+    }
+  }
+
+  try {
+    const href = URL.createObjectURL(blob)
+    const a = document.createElement('a')
+    a.href = href
+    a.download = filename
+    document.body.appendChild(a)
+    a.click()
+    a.remove()
+    setTimeout(() => URL.revokeObjectURL(href), 2000)
+    return { ok: true, mode: 'download' }
+  } catch (e) {
+    return {
+      ok: false,
+      message: (e && e.message) || '下载 PDF 失败'
     }
   }
 }