绝尘
e5dbe89a6f
- Markdown 编辑器：实时预览、PDF 导出、独立查看器 - 数据库优化：动态连接池、查询缓存、Redis Pipeline - 窗口置顶功能 - 文件系统增强：右键菜单、编辑器集成、收藏夹重构 - 安全修复：XSS 防护、路径穿越、HTML 注入 - 代码质量：正则预编译、缓存锁优化、死代码清理
379 lines
9.7 KiB
Go
379 lines
9.7 KiB
Go
package api
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import (
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"context"
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"fmt"
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"html"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/chromedp/cdproto/page"
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"github.com/chromedp/chromedp"
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"github.com/yuin/goldmark"
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"u-desk/internal/common"
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)
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// PdfExportRequest PDF导出请求结构体
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type PdfExportRequest struct {
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Content string `json:"content"` // Markdown/HTML内容
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Title string `json:"title"` // PDF标题
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FileName string `json:"fileName"` // 文件名（不含扩展名）
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FontSize int `json:"fontSize"` // 字体大小
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PageWidth int `json:"pageWidth"` // 页面宽度（mm）
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PageHeight int `json:"pageHeight"` // 页面高度（mm）
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}
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// PdfExportResponse PDF导出响应结构体
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type PdfExportResponse struct {
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Success bool `json:"success"`
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Message string `json:"message"`
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Path string `json:"path"` // PDF文件保存路径
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Size int64 `json:"size"` // 文件大小（字节）
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}
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// PdfAPI PDF导出API
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type PdfAPI struct {
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// 可以在这里添加依赖，如文件系统服务等
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}
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// NewPdfAPI 创建PDF导出API
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func NewPdfAPI() (*PdfAPI, error) {
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return &PdfAPI{}, nil
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}
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// ExportMarkdownToPDF 将Markdown内容导出为PDF - 使用chromedp实现
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func (api *PdfAPI) ExportMarkdownToPDF(req PdfExportRequest) (*PdfExportResponse, error) {
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// 验证参数
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if strings.TrimSpace(req.Content) == "" {
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return nil, fmt.Errorf("内容不能为空")
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}
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if strings.TrimSpace(req.FileName) == "" {
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req.FileName = "document_" + time.Now().Format("20060102_150405")
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}
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if req.FontSize <= 0 {
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req.FontSize = 12
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}
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// 设置默认页面尺寸（A4）
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if req.PageWidth <= 0 {
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req.PageWidth = 210
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}
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if req.PageHeight <= 0 {
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req.PageHeight = 297
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}
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// 将Markdown转换为HTML
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htmlContent := api.markdownToHTML(req.Content, req.Title, req.FontSize)
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// 使用chromedp生成PDF
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pdfBuffer, err := api.generatePDFFromHTML(htmlContent, req.Title, req.PageWidth, req.PageHeight)
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if err != nil {
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return nil, fmt.Errorf("生成PDF失败: %v", err)
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}
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// 生成文件名
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if !strings.HasSuffix(strings.ToLower(req.FileName), ".pdf") {
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req.FileName += ".pdf"
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}
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// 获取用户桌面目录作为默认保存位置
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saveDir := api.getDesktopDirectory()
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// 确保目录存在
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if err := os.MkdirAll(saveDir, 0755); err != nil {
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return nil, fmt.Errorf("创建目录失败: %v", err)
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}
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// 完整保存路径
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savePath := filepath.Join(saveDir, filepath.Base(req.FileName))
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// 保存PDF文件
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err = os.WriteFile(savePath, pdfBuffer, 0644)
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if err != nil {
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return nil, fmt.Errorf("保存PDF文件失败: %v", err)
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}
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// 获取文件信息
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fileInfo, err := os.Stat(savePath)
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if err != nil {
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return nil, fmt.Errorf("获取文件信息失败: %v", err)
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}
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// 返回成功响应
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return &PdfExportResponse{
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Success: true,
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Message: "PDF生成成功",
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Path: savePath,
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Size: fileInfo.Size(),
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}, nil
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}
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// markdownToHTML 将Markdown转换为HTML
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func (api *PdfAPI) markdownToHTML(markdownContent string, title string, fontSize int) string {
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// 基础HTML模板
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htmlTemplate := `<!DOCTYPE html>
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<html lang="zh-CN">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<style>
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body {
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font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
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line-height: 1.6;
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color: #333;
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max-width: 800px;
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margin: 0 auto;
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padding: 40px 20px;
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font-size: %dpx;
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}
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h1, h2, h3, h4, h5, h6 {
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margin-top: 24px;
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margin-bottom: 16px;
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font-weight: 600;
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line-height: 1.25;
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}
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h1 {
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font-size: 2em;
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border-bottom: 1px solid #eaecef;
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padding-bottom: 0.3em;
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}
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h2 {
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font-size: 1.5em;
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border-bottom: 1px solid #eaecef;
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padding-bottom: 0.3em;
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}
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h3 {
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font-size: 1.25em;
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}
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h4 {
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font-size: 1em;
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}
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h5 {
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font-size: 0.875em;
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}
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h6 {
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font-size: 0.85em;
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color: #6a737d;
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}
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p {
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margin-bottom: 16px;
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}
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blockquote {
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margin: 0 0 16px;
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padding: 0 1em;
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color: #6a737d;
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border-left: 0.25em solid #dfe2e5;
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}
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ul, ol {
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padding-left: 2em;
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margin-bottom: 16px;
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}
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li {
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margin-bottom: 4px;
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}
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code {
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font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
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background-color: rgba(27,31,35,0.05);
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border-radius: 3px;
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font-size: 85%;
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margin: 0;
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padding: 0.2em 0.4em;
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}
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pre {
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background-color: #f6f8fa;
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border-radius: 3px;
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padding: 16px;
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overflow: auto;
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margin-bottom: 16px;
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}
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pre code {
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background-color: transparent;
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padding: 0;
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margin: 0;
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font-size: 100%;
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}
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table {
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border-collapse: collapse;
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width: 100%;
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margin-bottom: 16px;
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border: 1px solid #dfe2e5;
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}
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th, td {
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padding: 8px 12px;
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border: 1px solid #dfe2e5;
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text-align: left;
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}
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th {
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background-color: #f6f8fa;
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font-weight: 600;
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}
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img {
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max-width: 100%;
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height: auto;
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margin: 16px 0;
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}
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hr {
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height: 0.25em;
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padding: 0;
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margin: 24px 0;
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background-color: #e1e4e8;
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border: 0;
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}
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.title {
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text-align: center;
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margin-bottom: 32px;
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font-size: 1.5em;
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color: #2c3e50;
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}
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</style>
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</head>
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<body>
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<div class="title">%s</div>
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%s
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</body>
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</html>`
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// 标题处理
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docTitle := ""
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if title != "" {
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docTitle = html.EscapeString(title)
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} else {
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docTitle = "文档"
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}
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// Markdown转HTML（使用goldmark）
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var htmlContent string
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var htmlBuf strings.Builder
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if err := goldmark.Convert([]byte(markdownContent), &htmlBuf); err != nil {
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htmlContent = "<p>Markdown 解析失败</p>"
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} else {
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htmlContent = htmlBuf.String()
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}
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// 生成完整的HTML
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fullHTML := fmt.Sprintf(htmlTemplate, fontSize, docTitle, htmlContent)
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return fullHTML
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}
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// generatePDFFromHTML 使用chromedp从HTML生成PDF
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func (api *PdfAPI) generatePDFFromHTML(htmlContent, title string, pageWidth, pageHeight int) ([]byte, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
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defer cancel()
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// 配置chromedp选项
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opts := []chromedp.ExecAllocatorOption{
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chromedp.Flag("headless", true),
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chromedp.Flag("disable-gpu", true),
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chromedp.Flag("no-sandbox", true),
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chromedp.Flag("disable-dev-shm-usage", true),
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chromedp.Flag("disable-software-rasterizer", true),
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chromedp.Flag("disable-extensions", true),
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chromedp.Flag("disable-notifications", true),
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}
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// 在Windows上设置Chrome路径
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if common.IsWindows() {
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// 常见的Windows Chrome路径
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chromePaths := []string{
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"C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe",
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"C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe",
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"C:\\Users\\" + os.Getenv("USERNAME") + "\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
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}
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for _, path := range chromePaths {
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if _, err := os.Stat(path); err == nil {
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opts = append(opts, chromedp.ExecPath(path))
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break
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}
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}
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}
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// 创建执行分配器上下文
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allocCtx, allocCancel := chromedp.NewExecAllocator(ctx, opts...)
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defer allocCancel()
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// 创建chromedp上下文
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chromeCtx, chromeCancel := chromedp.NewContext(allocCtx)
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defer chromeCancel()
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// 创建一个临时的目录用于PDF生成
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tempDir, err := os.MkdirTemp("", "pdf_gen")
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if err != nil {
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return nil, fmt.Errorf("创建临时目录失败: %v", err)
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}
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defer os.RemoveAll(tempDir)
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// 将HTML写入临时文件
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htmlFile := filepath.Join(tempDir, "document.html")
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if err := os.WriteFile(htmlFile, []byte(htmlContent), 0644); err != nil {
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return nil, fmt.Errorf("写入HTML文件失败: %v", err)
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}
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var buf []byte
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// 使用 file URL 加载本地HTML文件
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err = chromedp.Run(chromeCtx,
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// 导航到HTML文件
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chromedp.Navigate("file://"+htmlFile),
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// 等待页面加载完成
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chromedp.WaitReady("body"),
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// 打印到PDF
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chromedp.ActionFunc(func(ctx context.Context) error {
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// 设置页面打印参数
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printToPDF := page.PrintToPDF().
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WithPrintBackground(true).
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WithLandscape(false).
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WithMarginTop(0).
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WithMarginBottom(0).
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WithMarginLeft(0).
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WithMarginRight(0).
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WithPaperWidth(float64(pageWidth) / 25.4). // mm to inches
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WithPaperHeight(float64(pageHeight) / 25.4) // mm to inches
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// 执行打印并获取PDF数据
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var err error
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buf, _, err = printToPDF.Do(ctx)
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return err
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}),
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)
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if err != nil {
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return nil, fmt.Errorf("chromedp执行失败: %v", err)
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}
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return buf, nil
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}
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// getDesktopDirectory 获取用户桌面目录
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func (api *PdfAPI) getDesktopDirectory() string {
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// Windows系统
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if common.IsWindows() {
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home := os.Getenv("USERPROFILE")
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if home != "" {
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return filepath.Join(home, "Desktop")
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}
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}
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// Linux/Mac系统
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home := os.Getenv("HOME")
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if home != "" {
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return filepath.Join(home, "Desktop")
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}
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// 备用：当前目录
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return "."
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}
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// SelectDirectory 选择保存目录（简化版，实际应该使用Wails runtime）
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func (api *PdfAPI) SelectDirectory() (string, error) {
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// 简化版：直接返回桌面目录
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desktop := api.getDesktopDirectory()
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if desktop == "." {
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return "", fmt.Errorf("无法确定默认目录")
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}
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return desktop, nil
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} |