Files: 42288cf44aa8aaf32d1036942ee30c6730803575 / lib / serve-blobs.js
1790 bytesRaw
| 1 | var pull = require('pull-stream') |
| 2 | var cat = require('pull-cat') |
| 3 | var toPull = require('stream-to-pull-stream') |
| 4 | var ident = require('pull-identify-filetype') |
| 5 | var mime = require('mime-types') |
| 6 | var URL = require('url') |
| 7 | var http = require('http') |
| 8 | |
| 9 | module.exports = function (context, cb) { |
| 10 | return http.createServer(ServeBlobs(context.sbot)).listen(context.config.blobsPort, cb) |
| 11 | } |
| 12 | |
| 13 | function ServeBlobs (sbot) { |
| 14 | return function (req, res, next) { |
| 15 | var parsed = URL.parse(req.url, true) |
| 16 | var hash = decodeURIComponent(parsed.pathname.slice(1)) |
| 17 | waitFor(hash, function (_, has) { |
| 18 | if (!has) return respond(res, 404, 'File not found') |
| 19 | // optional name override |
| 20 | if (parsed.query.name) { |
| 21 | res.setHeader('Content-Disposition', 'inline; filename=' + encodeURIComponent(parsed.query.name)) |
| 22 | } |
| 23 | |
| 24 | // serve |
| 25 | res.setHeader('Content-Security-Policy', BlobCSP()) |
| 26 | respondSource(res, sbot.blobs.get(hash), false) |
| 27 | }) |
| 28 | } |
| 29 | |
| 30 | function waitFor (hash, cb) { |
| 31 | sbot.blobs.has(hash, function (err, has) { |
| 32 | if (err) return cb(err) |
| 33 | if (has) { |
| 34 | cb(null, has) |
| 35 | } else { |
| 36 | sbot.blobs.want(hash, cb) |
| 37 | } |
| 38 | }) |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | function respondSource (res, source, wrap) { |
| 43 | if (wrap) { |
| 44 | res.writeHead(200, {'Content-Type': 'text/html'}) |
| 45 | pull( |
| 46 | cat([ |
| 47 | pull.once('<html><body><script>'), |
| 48 | source, |
| 49 | pull.once('</script></body></html>') |
| 50 | ]), |
| 51 | toPull.sink(res) |
| 52 | ) |
| 53 | } else { |
| 54 | pull( |
| 55 | source, |
| 56 | ident(function (type) { |
| 57 | if (type) res.writeHead(200, {'Content-Type': mime.lookup(type)}) |
| 58 | }), |
| 59 | toPull.sink(res) |
| 60 | ) |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | function respond (res, status, message) { |
| 65 | res.writeHead(status) |
| 66 | res.end(message) |
| 67 | } |
| 68 | |
| 69 | function BlobCSP () { |
| 70 | return 'default-src none; sandbox' |
| 71 | } |
| 72 |
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