87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
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package pdfrender
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import (
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"fmt"
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"os"
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"path/filepath"
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"regexp"
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"strings"
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)
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// InlineResources inlines external CSS and images into the HTML for PDF rendering
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func InlineResources(html string, templateDir string) (string, error) {
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// Inline CSS
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cssRegex := regexp.MustCompile(`<link\s+rel="stylesheet"\s+href="([^"]+)"[^>]*>`)
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html = cssRegex.ReplaceAllStringFunc(html, func(match string) string {
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matches := cssRegex.FindStringSubmatch(match)
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if len(matches) < 2 {
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return match
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}
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cssPath := matches[1]
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fullPath := filepath.Join(templateDir, cssPath)
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cssContent, err := os.ReadFile(fullPath)
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if err != nil {
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// Return original tag if CSS can't be loaded
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return match
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}
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return fmt.Sprintf("<style>\n%s\n</style>", string(cssContent))
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})
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// Inline images (except data URIs which are already inline)
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imgRegex := regexp.MustCompile(`<img\s+src="([^"]+)"([^>]*)>`)
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html = imgRegex.ReplaceAllStringFunc(html, func(match string) string {
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matches := imgRegex.FindStringSubmatch(match)
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if len(matches) < 3 {
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return match
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}
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imgSrc := matches[1]
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imgAttrs := matches[2]
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// Skip if already a data URI or template variable
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if strings.HasPrefix(imgSrc, "data:") || strings.Contains(imgSrc, "{{") {
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return match
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}
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fullPath := filepath.Join(templateDir, imgSrc)
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imgData, err := os.ReadFile(fullPath)
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if err != nil {
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// Return original tag if image can't be loaded
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return match
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}
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// Detect mime type from extension
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mimeType := "image/png"
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ext := strings.ToLower(filepath.Ext(imgSrc))
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switch ext {
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case ".jpg", ".jpeg":
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mimeType = "image/jpeg"
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case ".gif":
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mimeType = "image/gif"
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case ".svg":
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mimeType = "image/svg+xml"
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}
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dataURI := ImageToBase64DataURI(imgData, mimeType)
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return fmt.Sprintf(`<img src="%s"%s>`, dataURI, imgAttrs)
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})
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return html, nil
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}
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// LoadAndInlineTemplate loads a template, renders it, and inlines all resources
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func (tl *TemplateLoader) RenderTemplateWithInlinedResources(templateName string, data interface{}) (string, error) {
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// First render the template
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html, err := tl.RenderTemplate(templateName, data)
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if err != nil {
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return "", err
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}
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// Then inline all external resources
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return InlineResources(html, tl.templateDir)
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}
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