Add workaround to handle URLs of scoped packages with unencoded /

Fixes https://github.com/rlidwka/sinopia/issues/104#issuecomment-66790574.

lib/index-api.js

@@ -33,6 +33,15 @@ module.exports = function(config, auth, storage) {
   app.use(expressJson5({ strict: false, limit: config.max_body_size || '10mb' }))
   app.use(Middleware.anti_loop(config))
 
+  // encode / in a scoped package name to be matched as a single parameter in routes
+  app.use(function(req, res, next) {
+    if (req.url.indexOf('@') != -1) {
+      // e.g.: /@org/pkg/1.2.3 -> /@org%2Fpkg/1.2.3, /@org%2Fpkg/1.2.3 -> /@org%2Fpkg/1.2.3
+      req.url = req.url.replace(/^(\/@[^\/%]+)\/(?!$)/, '$1%2F')
+    }
+    next()
+  })
+
   // for "npm whoami"
   app.get('/whoami', function(req, res, next) {
     if (req.headers.referer === 'whoami') {

test/functional/scoped.js

@@ -65,5 +65,14 @@ module.exports = function() {
                  assert.deepEqual(body['dist-tags'], {latest: '1.0.0'})
                })
     })
+
+    it('server2 - nginx workaround', function () {
+      return server2.request({ uri: '/@test/scoped/1.0.0' })
+               .status(200)
+               .then(function (body) {
+                 assert.equal(body.name, '@test/scoped')
+                 assert.equal(body.dist.tarball, 'http://localhost:55552/@test%2fscoped/-/scoped-1.0.0.tgz')
+               })
+    })
   })
 }