压缩PDF

package-lock.json

@@ -58,6 +58,8 @@
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@@ -2772,7 +2782,6 @@
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@@ -2795,7 +2804,6 @@
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       "version": "2.2.8",
       "resolved": "https://registry.npmmirror.com/w3c-keyname/-/w3c-keyname-2.2.8.tgz",
       "integrity": "sha512-dpojBhNsCNN7T82Tm7k26A6G9ML3NkhDsnw9n/eoxSRlVBB4CEtIQ/KTCLI2Fwf3ataSXRhYFkQi3SlnFwPvPQ==",
-      "dev": true
+      "dev": true,
+      "peer": true
     },
     "node_modules/wangeditor": {
       "version": "4.7.15",

package.json

@@ -76,6 +76,8 @@
     "min-dash": "^4.1.1",
     "mitt": "^3.0.1",
     "nprogress": "^0.2.0",
+    "pdf-lib": "^1.17.1",
+    "pdfjs-dist": "^4.8.69",
     "pinia": "^2.1.7",
     "pinia-plugin-persistedstate": "^3.2.1",
     "pinyin": "^4.0.0-alpha.2",

src/components/UploadFile/src/useUpload.ts

@@ -1,5 +1,4 @@
 import * as FileApi from '@/api/infra/file'
-import CryptoJS from 'crypto-js'
 import { UploadRawFile, UploadRequestOptions } from 'element-plus/es/components/upload/src/upload'
 import axios from 'axios'
 
@@ -102,6 +101,164 @@ export const fillFileListMetaInfo = async (list: FileItem[]): Promise<void> => {
   await Promise.all(list.map((item) => fillFileMetaInfo(item)))
 }
 
+/**
+ * 图片压缩选项
+ */
+interface CompressOptions {
+  /** 触发压缩的文件大小阈值（字节），默认 5MB */
+  maxSize?: number
+  /** 图片最大宽度，默认 1920 */
+  maxWidth?: number
+  /** 图片最大高度，默认 1920 */
+  maxHeight?: number
+  /** 图片压缩质量 0-1，默认 0.8 */
+  quality?: number
+}
+
+/**
+ * 压缩图片文件
+ */
+const compressImage = (file: File, options: CompressOptions = {}): Promise<File> => {
+  return new Promise((resolve, reject) => {
+    const { maxWidth = 1920, maxHeight = 1920, quality = 0.8 } = options
+    const reader = new FileReader()
+    reader.onload = (e) => {
+      const img = new Image()
+      img.onload = () => {
+        let { width, height } = img
+        if (width > maxWidth || height > maxHeight) {
+          const ratio = Math.min(maxWidth / width, maxHeight / height)
+          width = Math.floor(width * ratio)
+          height = Math.floor(height * ratio)
+        }
+        const canvas = document.createElement('canvas')
+        canvas.width = width
+        canvas.height = height
+        const ctx = canvas.getContext('2d')
+        if (!ctx) {
+          resolve(file)
+          return
+        }
+        ctx.drawImage(img, 0, 0, width, height)
+        const outputType = file.type === 'image/png' ? 'image/jpeg' : file.type || 'image/jpeg'
+        canvas.toBlob(
+          (blob) => {
+            if (!blob) {
+              resolve(file)
+              return
+            }
+            const compressed = new File([blob], file.name, { type: outputType })
+            resolve(compressed.size < file.size ? compressed : file)
+          },
+          outputType,
+          quality
+        )
+      }
+      img.onerror = () => resolve(file)
+      img.src = e.target?.result as string
+    }
+    reader.onerror = () => resolve(file)
+    reader.readAsDataURL(file)
+  })
+}
+
+/**
+ * 将 File 转为 ArrayBuffer
+ */
+const fileToArrayBuffer = (file: File): Promise<ArrayBuffer> => {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader()
+    reader.onload = (e) => resolve(e.target?.result as ArrayBuffer)
+    reader.onerror = reject
+    reader.readAsArrayBuffer(file)
+  })
+}
+
+/**
+ * 压缩 PDF 文件（逐页渲染为图片，压缩后重新生成 PDF）
+ * 依赖 pdf-lib 和 pdfjs-dist，请手动安装：pnpm add pdf-lib pdfjs-dist
+ */
+const compressPdf = async (file: File, options: CompressOptions = {}): Promise<File> => {
+  const { maxWidth = 2400, maxHeight = 2400, quality = 0.9 } = options
+  const [{ PDFDocument }, pdfjsLib] = await Promise.all([
+    import('pdf-lib'),
+    import('pdfjs-dist')
+  ])
+
+  // 配置 pdfjs worker，使用 node_modules 中的 worker 文件，确保版本匹配
+  const pdfjs: any = pdfjsLib
+  if (!pdfjs.GlobalWorkerOptions.workerSrc) {
+    pdfjs.GlobalWorkerOptions.workerSrc = new URL(
+      'pdfjs-dist/build/pdf.worker.mjs',
+      import.meta.url
+    ).href
+  }
+
+  const arrayBuffer = await fileToArrayBuffer(file)
+  const pdfDocument = await pdfjs.getDocument({ data: arrayBuffer }).promise
+  const newPdf = await PDFDocument.create()
+
+  for (let i = 1; i <= pdfDocument.numPages; i++) {
+    const page = await pdfDocument.getPage(i)
+    // 基础 scale 2.0，文字更清晰；再根据最大尺寸等比缩放
+    const baseScale = 1.2
+    const baseViewport = page.getViewport({ scale: baseScale })
+
+    let renderWidth = baseViewport.width
+    let renderHeight = baseViewport.height
+    if (renderWidth > maxWidth || renderHeight > maxHeight) {
+      const ratio = Math.min(maxWidth / renderWidth, maxHeight / renderHeight)
+      renderWidth = Math.floor(renderWidth * ratio)
+      renderHeight = Math.floor(renderHeight * ratio)
+    }
+
+    const canvas = document.createElement('canvas')
+    const ctx = canvas.getContext('2d')
+    if (!ctx) continue
+    canvas.width = renderWidth
+    canvas.height = renderHeight
+
+    // 用正确的 scale 渲染，铺满整个 canvas
+    const renderScale = renderWidth / baseViewport.width * baseScale
+    const renderViewport = page.getViewport({ scale: renderScale })
+    await page.render({ canvasContext: ctx, viewport: renderViewport }).promise
+
+    const imageData = canvas.toDataURL('image/jpeg', quality)
+    const imageBytes = Uint8Array.from(atob(imageData.split(',')[1]), (c) => c.charCodeAt(0))
+    const embeddedImage = await newPdf.embedJpg(imageBytes)
+
+    // 新 PDF 页面使用原始页面尺寸（点），图片铺满页面
+    const originalViewport = page.getViewport({ scale: 1 })
+    const newPage = newPdf.addPage([originalViewport.width, originalViewport.height])
+    newPage.drawImage(embeddedImage, {
+      x: 0,
+      y: 0,
+      width: originalViewport.width,
+      height: originalViewport.height
+    })
+  }
+
+  const newPdfBytes = await newPdf.save()
+  const compressed = new File([newPdfBytes], file.name, { type: 'application/pdf' })
+  return compressed.size < file.size ? compressed : file
+}
+
+/**
+ * 根据文件类型压缩文件（超过阈值时）
+ */
+const compressFile = async (file: File, options: CompressOptions = {}): Promise<File> => {
+  const { maxSize = 5 * 1024 * 1024 } = options
+  if (file.size <= maxSize) return file
+
+  if (file.type.startsWith('image/')) {
+    return compressImage(file, options)
+  }
+  if (file.type === 'application/pdf') {
+    return compressPdf(file, options)
+  }
+  return file
+}
+
 export const useUpload = (menu: string = '', elder: any = { elderId: '', elderName: '' }) => {
   // 后端上传地址
   const uploadUrl = getUploadUrl()
@@ -111,23 +268,26 @@ export const useUpload = (menu: string = '', elder: any = { elderId: '', elderNa
   const uploadTimeout = 5 * 60 * 1000
   // 重写ElUpload上传方法
   const httpRequest = async (options: UploadRequestOptions) => {
+    // 上传前压缩：图片/PDF 大于 5MB 时压缩
+    const file = await compressFile(options.file, { maxSize: 5 * 1024 * 1024 })
+
     // 模式一：前端上传
     if (isClientUpload) {
       // 1.1 生成文件名称
-      const fileName = await generateFileName(options.file)
+      const fileName = generateFileName(file)
       // 1.2 获取文件预签名地址
       const presignedInfo = await FileApi.getFilePresignedUrl(fileName)
       // 1.3 上传文件（不能使用 ElUpload 的 ajaxUpload 方法的原因：其使用的是 FormData 上传，Minio 不支持）
       return axios
-        .put(presignedInfo.uploadUrl, options.file, {
+        .put(presignedInfo.uploadUrl, file, {
           headers: {
-            'Content-Type': options.file.type
+            'Content-Type': file.type
           },
           timeout: uploadTimeout
         })
         .then(() => {
           // 1.4. 记录文件信息到后端（异步）
-          createFile(presignedInfo, fileName, options.file)
+          createFile(presignedInfo, fileName, file)
           // 通知成功，数据格式保持与后端上传的返回结果一致
           return { data: presignedInfo.url }
         })
@@ -136,7 +296,7 @@ export const useUpload = (menu: string = '', elder: any = { elderId: '', elderNa
       // 重写 el-upload httpRequest 文件上传成功会走成功的钩子，失败走失败的钩子
       return new Promise((resolve, reject) => {
         FileApi.updateFile({
-          file: options.file,
+          file,
           operation: menu,
           elderName: elder.elderName,
           elderId: elder.elderId
@@ -145,12 +305,12 @@ export const useUpload = (menu: string = '', elder: any = { elderId: '', elderNa
             if (res.code === 0) {
               resolve({
                 ...res,
-                fileName: options.file.name
+                fileName: file.name
               })
             } else {
               reject({
                 ...res,
-                fileName: options.file.name
+                fileName: file.name
               })
             }
           })
@@ -187,18 +347,14 @@ function createFile(vo: FileApi.FilePresignedUrlRespVO, name: string, file: Uplo
 }
 
 /**
- * 生成文件名称（使用算法SHA256）
+ * 生成文件名称（时间戳 + 随机数，避免读取大文件内容）
  * @param file 要上传的文件
  */
-async function generateFileName(file: UploadRawFile) {
-  // 读取文件内容
-  const data = await file.arrayBuffer()
-  const wordArray = CryptoJS.lib.WordArray.create(data)
-  // 计算SHA256
-  const sha256 = CryptoJS.SHA256(wordArray).toString()
-  // 拼接后缀
+function generateFileName(file: UploadRawFile) {
+  const timestamp = Date.now()
+  const random = Math.random().toString(36).substring(2, 8)
   const ext = file.name.substring(file.name.lastIndexOf('.'))
-  return `${sha256}${ext}`
+  return `${timestamp}-${random}${ext}`
 }
 
 /**