Add /_metadata and /_module functions

Also deprecate ?meta and ?module query params.

modules/actions/serveFile.js

@@ -1,13 +1,13 @@
 import serveAutoIndexPage from './serveAutoIndexPage';
-import serveHTMLModule from './serveHTMLModule';
-import serveJavaScriptModule from './serveJavaScriptModule';
 import serveMetadata from './serveMetadata';
+import serveModule from './serveModule';
 import serveStaticFile from './serveStaticFile';
 
 /**
  * Send the file, JSON metadata, or HTML directory listing.
  */
 export default function serveFile(req, res) {
+  // Deprecated.
   if (req.query.meta != null) {
     return serveMetadata(req, res);
   }
@@ -16,19 +16,9 @@ export default function serveFile(req, res) {
     return serveAutoIndexPage(req, res);
   }
 
+  // Deprecated.
   if (req.query.module != null) {
-    if (req.entry.contentType === 'application/javascript') {
-      return serveJavaScriptModule(req, res);
-    }
-
-    if (req.entry.contentType === 'text/html') {
-      return serveHTMLModule(req, res);
-    }
-
-    return res
-      .status(403)
-      .type('text')
-      .send('?module mode is available only for JavaScript and HTML files');
+    return serveModule(req, res);
   }
 
   serveStaticFile(req, res);

modules/actions/serveModule.js

@@ -0,0 +1,17 @@
+import serveHTMLModule from './serveHTMLModule';
+import serveJavaScriptModule from './serveJavaScriptModule';
+
+export default function serveModule(req, res) {
+  if (req.entry.contentType === 'application/javascript') {
+    return serveJavaScriptModule(req, res);
+  }
+
+  if (req.entry.contentType === 'text/html') {
+    return serveHTMLModule(req, res);
+  }
+
+  res
+    .status(403)
+    .type('text')
+    .send('module mode is available only for JavaScript and HTML files');
+}

modules/middleware/redirectLegacyURLs.js

@@ -1,20 +1,15 @@
-import createSearch from '../utils/createSearch';
-
 /**
  * Redirect old URLs that we no longer support.
  */
 export default function redirectLegacyURLs(req, res, next) {
-  // Permanently redirect /_meta/path to /path?meta.
+  // Permanently redirect /_meta/path to /_metadata/path
   if (req.path.match(/^\/_meta\//)) {
-    req.query.meta = '';
-    return res.redirect(301, req.path.substr(6) + createSearch(req.query));
+    return res.redirect(301, '/_metadata' + req.path.substr(6));
   }
 
   // Permanently redirect /path?json => /path?meta
   if (req.query.json != null) {
-    delete req.query.json;
-    req.query.meta = '';
-    return res.redirect(301, req.path + createSearch(req.query));
+    return res.redirect(301, '/_metadata' + req.path);
   }
 
   next();

modules/middleware/validateQuery.js

@@ -2,8 +2,8 @@ import createSearch from '../utils/createSearch';
 
 const knownQueryParams = {
   main: true, // Deprecated, see #63
-  meta: true,
-  module: true
+  meta: true, // Deprecated
+  module: true // Deprecated
 };
 
 function isKnownQueryParam(param) {

modules/server.js

@@ -3,6 +3,8 @@ import express from 'express';
 // import serveAuth from './actions/serveAuth';
 import serveFile from './actions/serveFile';
 import serveMainPage from './actions/serveMainPage';
+import serveMetadata from './actions/serveMetadata';
+import serveModule from './actions/serveModule';
 import servePublicKey from './actions/servePublicKey';
 import serveStats from './actions/serveStats';
 
@@ -49,6 +51,36 @@ app.use(
   })
 );
 
+app.use(
+  '/_metadata',
+  createRouter(app => {
+    app.get(
+      '*',
+      validatePackageURL,
+      validatePackageName,
+      validateQuery,
+      fetchPackage,
+      findFile,
+      serveMetadata
+    );
+  })
+);
+
+app.use(
+  '/_module',
+  createRouter(app => {
+    app.get(
+      '*',
+      validatePackageURL,
+      validatePackageName,
+      validateQuery,
+      fetchPackage,
+      findFile,
+      serveModule
+    );
+  })
+);
+
 app.get(
   '*',
   validatePackageURL,