33 lines
1.1 KiB
JavaScript
33 lines
1.1 KiB
JavaScript
import crypto from 'crypto'
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import path from 'path'
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import fs from 'fs-extra'
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const engines = [ require('./preview/image'), require('./preview/ffmpeg'), require('./preview/unoconv') ]
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const cache_name = file => crypto.createHash('sha1').update(file.fullpath).digest('hex')
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module.exports = (files, cache_path) => {
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const metadata = async file =>
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Object.assign({}, ...await Promise.all(
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engines.map(p => p.metadata && p.detect(file) && p.metadata(file) || {})))
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const preview = async file => {
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const p = engines.find(p => p.preview && p.detect(file))
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if (p) {
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const dest = path.join(cache_path, cache_name(file)) + '.' + p.ext(file)
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if (!await fs.pathExists(dest)) await p.preview(file.fullpath, dest)
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return dest
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}
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}
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const handler = async (file, res) => {
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const { fullpath } = file, preview_path = await (_gen[fullpath] = _gen[fullpath] || preview(file))
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delete _gen[fullpath] // @TODO in finally
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preview_path ? res.sendFile(preview_path) : res.sendStatus(405)
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}
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const _gen = {}
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return { handler, metadata }
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}
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