Microblog Feed Template

This template creates a minimal microblogging app. Users publish posts as files in the /microblog/ folder of their profile drive. The app uses the user’s address book to choose whose posts to fetch.

Source

<!doctype html>
<html>
  <head>
    <link rel="icon" type="image/png" sizes="32x32" href="/thumb.png">
    <link rel="stylesheet" href="/index.css">
  </head>
  <body>
    <h1>My Feed</h1>
    <microblog-composer></microblog-composer>
    <microblog-feed></microblog-feed>
  </body>
  <script type="module" src="/index.js"></script>
</html>

const IFRAME_CSP = `default-src 'self' 'unsafe-inline';`
const IFRAME_SANDBOX = `allow-forms allow-scripts allow-popups allow-popups-to-escape-sandbox`

const PATH = '/microblog/'
var profile = undefined
try { profile = JSON.parse(localStorage.profile) }
catch (e) { console.debug(e) }

customElements.define('microblog-composer', class extends HTMLElement {
  async connectedCallback () {
    if (!profile) {
      this.append(h('button', {click: this.onClickChangeProfile.bind(this)}, 'Select a profile to post with'))
    } else {
      this.append(h('form', {submit: this.onSubmit},
        h('p', h('textarea', {name: 'content', required: true, placeholder: 'Enter your post here'})),
        h('p',
          h('input', {name: 'filename', placeholder: 'Post filename (optional)'}),
          h('button', {type: 'submit'}, `Post to ${profile.title}'s microblog`),
          ' ',
          h('small', h('a', {href: '#', click: this.onClickChangeProfile.bind(this)}, 'Change profile'))
        )
      ))
    }
  }

  async onSubmit (e) {
    e.preventDefault()
    var filename = e.target.filename.value
    var content = e.target.content.value
    filename = filename || `${Date.now()}.md`
    if (filename.indexOf('.') === -1) filename += '.md'
    await nomad.fs.drive(profile.url).mkdir(PATH).catch(e => undefined)
    await nomad.fs.drive(profile.url).writeFile(PATH + filename, content)
    location.reload()
  }

  async onClickChangeProfile (e) {
    e.preventDefault()
    profile = await nomad.contacts.requestProfile()
    localStorage.profile = JSON.stringify(profile)
    location.reload()
  }
})


customElements.define('microblog-feed', class extends HTMLElement {
  async connectedCallback () {
    this.textContent = 'loading...'
    try {
      var sources = []
      if (profile) {
        sources = await nomad.contacts.list()
      }
      let drive = sources.map(s => s.url)
      if (profile && !drive.includes(profile.url)) {
        drive.push(profile.url)
      }
      var files = await nomad.fs.query({
        path: PATH + '*',
        drive,
        sort: 'ctime',
        reverse: true,
        limit: this.hasAttribute('limit') ? Number(this.getAttribute('limit')) : 100
      })
    } catch (e) {
      this.textContent = e.toString()
      console.debug(`Unable to query ${PATH}`, e)
      return
    }
    this.textContent = ''

    for (let file of files) {
      let postDiv = h('div', {class: 'post'})
      postDiv.append(
        h('a', {class: 'thumb', href: file.drive},
          h('img', {src: `${file.drive}thumb`})
        )
      )

      let filename = file.path.split('/').pop()
      let day = niceDate(file.stat.ctime)
      postDiv.append(h('div', {class: 'meta'},
        h('a', {href: file.url, title: filename}, filename),
        ' ',
        day
      ))

      try {
        if (/\.(png|jpe?g|gif|svg)$/i.test(file.path)) {
         postDiv.append(h('div', {class: 'content'}, h('img', {src: file.url})))
        } else if (/\.(mp4|webm|mov)/i.test(file.path)) {
         postDiv.append(h('div', {class: 'content'}, h('video', {controls: true}, h('source', {src: file.url}))))
        } else if (/\.(mp3|ogg)/i.test(file.path)) {
         postDiv.append(h('div', {class: 'content'}, h('audio', {controls: true}, h('source', {src: file.url}))))
        } else if (/\.html?$/i.test(file.path)) {
            let content = h('iframe', {
              class: 'content',
              csp: IFRAME_CSP,
              sandbox: IFRAME_SANDBOX,
              src: file.url
            })
            postDiv.append(content)
        } else {
          let txt = await nomad.fs.readFile(file.url)
          if (/\.md$/i.test(file.path)) {
            let content = h('div', {class: 'content'})
            content.innerHTML = nomad.markdown.toHTML(txt)
            postDiv.append(content)
          } else {
            postDiv.append(h('div', {class: 'content'}, h('pre', txt)))
          }
        }
      } catch (e) {
        console.error('Failed to read', file.path)
        console.error(e)
        continue
      }

      this.append(postDiv)
    }
  }
})

function h (tag, attrs, ...children) {
  var el = document.createElement(tag)
  if (isPlainObject(attrs)) {
    for (let k in attrs) {
      if (typeof attrs[k] === 'function') el.addEventListener(k, attrs[k])
      else el.setAttribute(k, attrs[k])
    }
  } else if (attrs) {
    children = [attrs].concat(children)
  }
  for (let child of children) el.append(child)
  return el
}

function isPlainObject (v) {
  return v && typeof v === 'object' && Object.prototype === v.__proto__
}

var today = (new Date()).toLocaleDateString()
var yesterday = (new Date(Date.now() - 8.64e7)).toLocaleDateString()
function niceDate (ts) {
  var date = (new Date(ts)).toLocaleDateString()
  if (date === today) return 'Today'
  if (date === yesterday) return 'Yesterday'
  return date
}

MIT License

Copyright (c) 2020 Blue Link Labs

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.