git ssb

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const nest = require('depnest')
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const pull = require('pull-stream')
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const { h, Value } = require('mutant')
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exports.gives = nest('app.page.blob')
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exports.needs = nest({
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  'blob.sync.url': 'first',
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  'sbot.pull.stream': 'first'
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})
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exports.create = (api) => {
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  return nest('app.page.blob', blobPage)
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  function blobPage (location) {
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    const { blob } = location
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    const title = blob.slice(0, 9) + '...'
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    const src = api.blob.sync.url(blob)
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    const content = Value()
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    isImage(blob, (err, isImage) => {
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      if (err) return console.log(err)
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      if (isImage) content.set(h('img', { src }))
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      else content.set(h('iframe', { src, sandbox: '' }))
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    })
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    const page = h('Blob', { title }, [
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      content,
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      h('a', { href: api.blob.sync.url(blob), target: '_blank' }, 'Open in browser')
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    ])
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    return page
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  }
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  // helpers
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  function isImage (blob, cb) {
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    pull(
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      api.sbot.pull.stream(server => server.blobs.get(blob)),
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      pull.take(1),
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      pull.collect((err, data) => {
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        if (err) throw err
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        // dig into the headers and get the 'magic numbers'
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        // mix: I copied this from the internet, it ight be terrible!
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        const arr = (new Uint8Array(data[0])).subarray(0, 4)
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        var header = ''
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        for (var i = 0; i < arr.length; i++) header += arr[i].toString(16)
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        // console.log(header)
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        switch (header) {
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          case '89504e47':
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            // 'image/png'
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            return cb(null, true)
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          case '47494638':
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            // 'image/gif'
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            return cb(null, true)
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          case 'ffd8ffe0':
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          case 'ffd8ffe1':
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          case 'ffd8ffe2':
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          case 'ffd8ffe3':
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          case 'ffd8ffe8':
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            // 'image/jpeg'
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            return cb(null, true)
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          case 'ffd8ffdb':
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            // 'image/???'
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            return cb(null, true)
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          default:
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            return cb(null, false)
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          // type = 'unknown' // Or you can use the blob.type as fallback
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        }
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      })
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    )
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  }
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}
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