* first action!

node_modules/pacote/lib/fetchers/registry/tarball.js

@@ -0,0 +1,102 @@
+'use strict'
+
+const BB = require('bluebird')
+
+const fetch = require('npm-registry-fetch')
+const manifest = require('./manifest')
+const optCheck = require('../../util/opt-check')
+const PassThrough = require('stream').PassThrough
+const ssri = require('ssri')
+const url = require('url')
+
+module.exports = tarball
+function tarball (spec, opts) {
+  opts = optCheck(opts)
+  const registry = fetch.pickRegistry(spec, opts)
+  const stream = new PassThrough()
+  let mani
+  if (
+    opts.resolved &&
+    // spec.type === 'version' &&
+    opts.resolved.indexOf(registry) === 0
+  ) {
+    // fakeChild is a shortcut to avoid looking up a manifest!
+    mani = BB.resolve({
+      name: spec.name,
+      version: spec.fetchSpec,
+      _integrity: opts.integrity,
+      _resolved: opts.resolved,
+      _fakeChild: true
+    })
+  } else {
+    // We can't trust opts.resolved if it's going to a separate host.
+    mani = manifest(spec, opts)
+  }
+
+  mani.then(mani => {
+    !mani._fakeChild && stream.emit('manifest', mani)
+    const fetchStream = fromManifest(mani, spec, opts).on(
+      'integrity', i => stream.emit('integrity', i)
+    )
+    fetchStream.on('error', err => stream.emit('error', err))
+    fetchStream.pipe(stream)
+    return null
+  }).catch(err => stream.emit('error', err))
+  return stream
+}
+
+module.exports.fromManifest = fromManifest
+function fromManifest (manifest, spec, opts) {
+  opts = optCheck(opts)
+  if (spec.scope) { opts = opts.concat({ scope: spec.scope }) }
+  const stream = new PassThrough()
+  const registry = fetch.pickRegistry(spec, opts)
+  const uri = getTarballUrl(spec, registry, manifest, opts)
+  fetch(uri, opts.concat({
+    headers: {
+      'pacote-req-type': 'tarball',
+      'pacote-pkg-id': `registry:${manifest.name}@${uri}`
+    },
+    integrity: manifest._integrity,
+    algorithms: [
+      manifest._integrity
+        ? ssri.parse(manifest._integrity).pickAlgorithm()
+        : 'sha1'
+    ],
+    spec
+  }, opts))
+    .then(res => {
+      const hash = res.headers.get('x-local-cache-hash')
+      if (hash) {
+        stream.emit('integrity', decodeURIComponent(hash))
+      }
+      res.body.on('error', err => stream.emit('error', err))
+      res.body.pipe(stream)
+      return null
+    })
+    .catch(err => stream.emit('error', err))
+  return stream
+}
+
+function getTarballUrl (spec, registry, mani, opts) {
+  const reg = url.parse(registry)
+  const tarball = url.parse(mani._resolved)
+  // https://github.com/npm/npm/pull/9471
+  //
+  // TL;DR: Some alternative registries host tarballs on http and packuments
+  // on https, and vice-versa. There's also a case where people who can't use
+  // SSL to access the npm registry, for example, might use
+  // `--registry=http://registry.npmjs.org/`. In this case, we need to
+  // rewrite `tarball` to match the protocol.
+  //
+  if (reg.hostname === tarball.hostname && reg.protocol !== tarball.protocol) {
+    tarball.protocol = reg.protocol
+    // Ports might be same host different protocol!
+    if (reg.port !== tarball.port) {
+      delete tarball.host
+      tarball.port = reg.port
+    }
+    delete tarball.href
+  }
+  return url.format(tarball)
+}