write/server/lib/odt.js

import JSZip from 'jszip'

function esc(str) {
  return String(str)
    .replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;').replace(/'/g, '&apos;')
}

function nodeToOdt(node) {
  if (!node) return ''
  const ch = () => (node.content || []).map(nodeToOdt).join('')

  switch (node.type) {
    case 'doc':       return ch()
    case 'paragraph': return `<text:p text:style-name="Text_20_Body">${ch()}</text:p>\n`
    case 'heading': {
      const l = node.attrs?.level || 1
      return `<text:h text:style-name="Heading_20_${l}" text:outline-level="${l}">${ch()}</text:h>\n`
    }
    case 'text': {
      let t = esc(node.text || '')
      const marks = node.marks || []
      const bold   = marks.some(m => m.type === 'bold')
      const italic = marks.some(m => m.type === 'italic')
      if (bold && italic) return `<text:span text:style-name="BoldItalic">${t}</text:span>`
      if (bold)           return `<text:span text:style-name="Strong_20_Emphasis">${t}</text:span>`
      if (italic)         return `<text:span text:style-name="Emphasis">${t}</text:span>`
      return t
    }
    case 'bulletList':  return (node.content || []).map(item =>
      (item.content || []).map(p =>
        `<text:p text:style-name="List_20_Bullet">${(p.content || []).map(nodeToOdt).join('')}</text:p>\n`
      ).join('')
    ).join('')
    case 'orderedList': return (node.content || []).map(item =>
      (item.content || []).map(p =>
        `<text:p text:style-name="List_20_Number">${(p.content || []).map(nodeToOdt).join('')}</text:p>\n`
      ).join('')
    ).join('')
    case 'blockquote':  return (node.content || []).map(n =>
      n.type === 'paragraph'
        ? `<text:p text:style-name="Quotations">${(n.content || []).map(nodeToOdt).join('')}</text:p>\n`
        : nodeToOdt(n)
    ).join('')
    case 'hardBreak':   return '<text:line-break/>'
    case 'image':       return '' // ODT image embedding is complex — skipped
    default:            return ch()
  }
}

const STYLES = `
  <style:style style:name="Text_20_Body" style:display-name="Text Body" style:family="paragraph">
    <style:paragraph-properties fo:margin-bottom="0.2cm" fo:line-height="150%"/>
    <style:text-properties fo:font-size="12pt"/>
  </style:style>
  <style:style style:name="Heading_20_1" style:display-name="Heading 1" style:family="paragraph">
    <style:paragraph-properties fo:margin-top="1.5cm" fo:margin-bottom="0.5cm" fo:break-before="page"/>
    <style:text-properties fo:font-size="18pt" fo:font-weight="bold"/>
  </style:style>
  <style:style style:name="Heading_20_2" style:display-name="Heading 2" style:family="paragraph">
    <style:paragraph-properties fo:margin-top="1cm" fo:margin-bottom="0.3cm"/>
    <style:text-properties fo:font-size="14pt" fo:font-weight="bold"/>
  </style:style>
  <style:style style:name="Heading_20_3" style:display-name="Heading 3" style:family="paragraph">
    <style:paragraph-properties fo:margin-top="0.8cm" fo:margin-bottom="0.2cm"/>
    <style:text-properties fo:font-size="12pt" fo:font-weight="bold" fo:font-style="italic"/>
  </style:style>
  <style:style style:name="Quotations" style:display-name="Quotations" style:family="paragraph">
    <style:paragraph-properties fo:margin-left="1cm" fo:margin-right="1cm"/>
    <style:text-properties fo:font-style="italic"/>
  </style:style>
  <style:style style:name="List_20_Bullet" style:display-name="List Bullet" style:family="paragraph">
    <style:paragraph-properties fo:margin-left="1cm"/>
  </style:style>
  <style:style style:name="List_20_Number" style:display-name="List Number" style:family="paragraph">
    <style:paragraph-properties fo:margin-left="1cm"/>
  </style:style>
  <style:style style:name="Strong_20_Emphasis" style:display-name="Strong Emphasis" style:family="text">
    <style:text-properties fo:font-weight="bold"/>
  </style:style>
  <style:style style:name="Emphasis" style:display-name="Emphasis" style:family="text">
    <style:text-properties fo:font-style="italic"/>
  </style:style>
  <style:style style:name="BoldItalic" style:display-name="Bold Italic" style:family="text">
    <style:text-properties fo:font-weight="bold" fo:font-style="italic"/>
  </style:style>
`

export async function generateOdt(story) {
  const zip = new JSZip()
  const doc = typeof story.content === 'string' ? JSON.parse(story.content) : (story.content || {})
  const title = story.title || 'Untitled'
  const body = nodeToOdt(doc)

  zip.file('mimetype', 'application/vnd.oasis.opendocument.text', { compression: 'STORE' })

  zip.file('META-INF/manifest.xml', `<?xml version="1.0" encoding="UTF-8"?>
<manifest:manifest xmlns:manifest="urn:oasis:names:tc:opendocument:xmlns:manifest:1.0" manifest:version="1.3">
  <manifest:file-entry manifest:full-path="/" manifest:media-type="application/vnd.oasis.opendocument.text"/>
  <manifest:file-entry manifest:full-path="content.xml" manifest:media-type="text/xml"/>
  <manifest:file-entry manifest:full-path="styles.xml" manifest:media-type="text/xml"/>
  <manifest:file-entry manifest:full-path="meta.xml" manifest:media-type="text/xml"/>
</manifest:manifest>`)

  zip.file('meta.xml', `<?xml version="1.0" encoding="UTF-8"?>
<office:document-meta xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0"
  xmlns:dc="http://purl.org/dc/elements/1.1/" office:version="1.3">
  <office:meta>
    <dc:title>${esc(title)}</dc:title>
  </office:meta>
</office:document-meta>`)

  zip.file('styles.xml', `<?xml version="1.0" encoding="UTF-8"?>
<office:document-styles
  xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0"
  xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0"
  xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0"
  xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0"
  office:version="1.3">
  <office:styles>${STYLES}</office:styles>
</office:document-styles>`)

  zip.file('content.xml', `<?xml version="1.0" encoding="UTF-8"?>
<office:document-content
  xmlns:office="urn:oasis:names:tc:opendocument:xmlns:office:1.0"
  xmlns:text="urn:oasis:names:tc:opendocument:xmlns:text:1.0"
  xmlns:style="urn:oasis:names:tc:opendocument:xmlns:style:1.0"
  xmlns:fo="urn:oasis:names:tc:opendocument:xmlns:xsl-fo-compatible:1.0"
  office:version="1.3">
  <office:body>
    <office:text>
      <text:h text:style-name="Heading_20_1" text:outline-level="1">${esc(title)}</text:h>
${body}    </office:text>
  </office:body>
</office:document-content>`)

  return zip.generateAsync({ type: 'nodebuffer' })
}