backend/app/controllers/Export.controller.js

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const Controller = require('libflitter/controller/Controller')
const os = require('os');
const fs = require('fs').promises;
const uuid = require('uuid/v4');
const path = require('path');
/*
* Export Controller
* -------------------------------------------------------------
* Put some description here!
*/
class Export extends Controller {
static get services() {
return [...super.services, 'models', 'app']
}
/*
* Serve the main page.
*/
async json_export(req, res) {
const Page = this.models.get('api:Page')
const Node = this.models.get('api:Node')
const user = req.user
const pages = await Page.find({ OrgUserId: user._id })
const ExportData = {}
for (const page of pages) {
const nodes = await Node.find({ PageId: page.UUID })
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const PageData = { ...page }
PageData.Nodes = nodes.map(node => { return { ...node } })
ExportData[page.Name] = PageData
}
return res.api(ExportData)
}
async markdown_export(req, res) {
const Page = this.models.get('api:Page')
const Node = this.models.get('api:Node')
const user = req.user
const page0 = await user.get_root_page() //topmost page
const temp_dir = path.resolve(os.tmpdir(), uuid())
await fs.mkdir(temp_dir)
await this._markdown_recurse(page0, temp_dir)
/* Archive directory */
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const exec = require('child_process').exec;
exec('cd ' + path.resolve(temp_dir) + '; zip -r archive.zip *', (error) => {
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if (error) {
console.error(`exec error: ${error}`);
return res.error(500);
return;
}
return res.sendFile(`${path.resolve(temp_dir, 'archive.zip')}`)
})
}
async _markdown_recurse(root, temp_dir) { //recursive function for creating directory and generating markdown pages
const fs = require('fs').promises
const Page = this.models.get('api:Page')
const child = await Page.find({ UUID: { $in: root.ChildPageIds } })
for (const page of child) {
const markdown = await this._generate_markdown(page)
await fs.writeFile(path.resolve(temp_dir, page.Name.replace(/\s/g, '_')) + '.md', markdown)
if (page.ChildPageIds && page.ChildPageIds.length) {
const sub_temp_dir = path.resolve(temp_dir, page.Name.replace(/\s/g, '_'))
// console.log(sub_temp_dir)
await fs.mkdir(sub_temp_dir)
await this._markdown_recurse(page, sub_temp_dir)
}
}
}
async _generate_markdown(page) { //generate mark down
const Node = this.models.get('api:Node')
const nodes = await Node.find({ PageId: page.UUID })
return nodes.map(x => {
if (x.Type === 'click_link') {
return '[' + x.Value.Value + ']' + '(' + x.Value.Value + ')'
}
return x.Value.Value
}).join('\n')
}
async html_export(req, res) {
const Page = this.models.get('api:Page')
const Node = this.models.get('api:Node')
const user = req.user
const pages = await Page.find({ OrgUserId: user._id })
const mapping = {} //keeps track of html file UUID and file name
const page0 = await user.get_root_page() //topmost page
for (const page of pages) {
const html_name = page.Name.replace(/\s/g, '_') + '.html'
mapping[page.UUID] = html_name
}
const sidebar_html = await this._generate_sidebar(mapping, user) //generates the sidebar contents
const temp_dir = path.resolve(os.tmpdir(), uuid()) //make temporary directory
await fs.mkdir(temp_dir)
/* Generates html files from template */
for (const page of pages) {
const fs = require('fs').promises
const contents = (await fs.readFile(path.resolve(this.app.directories.assets, 'export-template.html'))).toString('utf8')
const content_html = await this._generate_html(page)
const page_html = contents.replace('%%CONTENTS%%', content_html).replace('%%SIDEBAR%%', sidebar_html)
await fs.writeFile(path.resolve(temp_dir, mapping[page.UUID]), page_html)
}
/* Archive directory */
const exec = require('child_process').exec;
exec('cd ' + path.resolve(temp_dir) + '; zip -r archive.zip *', (error) => {
if (error) {
console.error(`exec error: ${error}`);
return res.error(500);
return;
}
return res.sendFile(`${path.resolve(temp_dir, 'archive.zip')}`)
})
}
async _generate_sidebar(mapping, user) {// the absolutely dreadful method to create, sidebar
const Page = this.models.get('api:Page')
const Node = this.models.get('api:Node')
const virt_root = await user.get_root_page()
return await this._sidebar_recurse(mapping, virt_root)
}
async _sidebar_recurse(mapping, parent) {
const Page = this.models.get('api:Page')
const Node = this.models.get('api:Node')
const children = await Page.find({ ParentId : parent.UUID})
let base = ''
for (const child of children) {
if (child.ChildPageIds.length === 0) {
base += '<a class="nav-link ml-2" href="' + mapping[child.UUID] + '">' + child.Name + '</a>' //mapping[child.UUID] gives filename
} else {
base += '<a class="nav-link ml-2" href="' + mapping[child.UUID] + '">' + child.Name + '</a>'
base += '<div class="nav nav-pills flex-column ml-2">'
base += await this._sidebar_recurse(mapping, child)
base += '</div>'
}
}
return base
}
async _generate_html(page) { //generate html page from page and node data
const Page = this.models.get('api:Page')
const Node = this.models.get('api:Node')
const nodes = await Node.find({ PageId: page.UUID })
return nodes.map(x => { return x.to_html() }).join('\n')
}
}
module.exports = exports = Export