fix(libnpmpublish): unpublish from custom reg

Fixes unpublishing a package from a registry url that has pathnames
after its hostname.

Fixes: npm#4253

workspaces/libnpmpublish/lib/unpublish.js

@@ -1,9 +1,26 @@
 'use strict'
 
+const { URL } = require('url')
 const npa = require('npm-package-arg')
 const npmFetch = require('npm-registry-fetch')
 const semver = require('semver')
-const { URL } = require('url')
+
+// given a tarball url and a registry url, returns just the
+// relevant pathname portion of it, so that it can be handled
+// elegantly by npm-registry-fetch which only expects pathnames
+// and handles the registry hostname via opts
+const getPathname = (tarball, registry) => {
+  const registryUrl = new URL(registry).pathname.substring(1)
+  let tarballUrl = new URL(tarball).pathname.substring(1)
+
+  // test the tarball url to see if it starts with a possible
+  // pathname from the registry url, in that case strips that portion
+  // of it so that we only return the post-registry-url pathname
+  if (registryUrl) {
+    tarballUrl = tarballUrl.substring(registryUrl.length)
+  }
+  return tarballUrl
+}
 
 const unpublish = async (spec, opts) => {
   spec = npa(spec)
@@ -82,7 +99,7 @@ const unpublish = async (spec, opts) => {
         ...opts,
         query: { write: true },
       })
-      const tarballUrl = new URL(dist.tarball).pathname.slice(1)
+      const tarballUrl = getPathname(dist.tarball, opts.registry)
       await npmFetch(`${tarballUrl}/-rev/${_rev}`, {
         ...opts,
         method: 'DELETE',

workspaces/libnpmpublish/test/unpublish.js

@@ -134,6 +134,61 @@ t.test('unpublish specific version', async t => {
   t.ok(ret, 'foo was unpublished')
 })
 
+t.test('unpublishing from a custom registry', async t => {
+  const opt = {
+    registry: 'https://artifactory.example.com/api/npm/npm-snapshots/',
+  }
+  const reg = opt.registry
+  const doc = {
+    _id: 'foo',
+    _rev: REV,
+    _revisions: [1, 2, 3],
+    _attachments: [1, 2, 3],
+    name: 'foo',
+    'dist-tags': {
+      latest: '1.0.1',
+    },
+    versions: {
+      '1.0.0': {
+        name: 'foo',
+        dist: {
+          tarball: `${reg}/foo/-/foo-1.0.0.tgz`,
+        },
+      },
+      '1.0.1': {
+        name: 'foo',
+        dist: {
+          tarball: `${reg}/foo/-/foo-1.0.1.tgz`,
+        },
+      },
+    },
+  }
+  const postEdit = {
+    _id: 'foo',
+    _rev: REV,
+    name: 'foo',
+    'dist-tags': {
+      latest: '1.0.0',
+    },
+    versions: {
+      '1.0.0': {
+        name: 'foo',
+        dist: {
+          tarball: `${reg}/foo/-/foo-1.0.0.tgz`,
+        },
+      },
+    },
+  }
+
+  const srv = tnock(t, reg)
+  srv.get('/foo?write=true').reply(200, doc)
+  srv.put(`/foo/-rev/${REV}`, postEdit).reply(200)
+  srv.get('/foo?write=true').reply(200, postEdit)
+  srv.delete(`/foo/-/foo-1.0.1.tgz/-rev/${REV}`).reply(200)
+  const ret = await unpub('[email protected]', opt)
+  t.ok(ret, 'foo was unpublished')
+})
+
 t.test('404 considered a success', async t => {
   const srv = tnock(t, REG)
   srv.get('/foo?write=true').reply(404)