New "browse" UI

Also, separated out browse, ?meta, and ?module request handlers. Fixes #82
2019-07-24 17:55:13 -07:00
parent ea35b3c4b0
commit 34baab07ab
57 changed files with 2431 additions and 686 deletions
--- a/modules/middleware/validateFilename.js
+++ b/modules/middleware/validateFilename.js
@ -0,0 +1,81 @@
+import createPackageURL from '../utils/createPackageURL.js';
+import createSearch from '../utils/createSearch.js';
+
+const leadingSlashes = /^\/*/;
+
+function filenameRedirect(req, res) {
+  let filename;
+  if (req.query.module != null) {
+    // See https://github.com/rollup/rollup/wiki/pkg.module
+    filename = req.packageConfig.module || req.packageConfig['jsnext:main'];
+
+    if (!filename) {
+      // https://nodejs.org/api/esm.html#esm_code_package_json_code_code_type_code_field
+      if (req.packageConfig.type === 'module') {
+        // Use whatever is in pkg.main or index.js
+        filename = req.packageConfig.main || '/index.js';
+      } else if (
+        req.packageConfig.main &&
+        /\.mjs$/.test(req.packageConfig.main)
+      ) {
+        // Use .mjs file in pkg.main
+        filename = req.packageConfig.main;
+      }
+    }
+
+    if (!filename) {
+      return res
+        .status(404)
+        .type('text')
+        .send(`Package ${req.packageSpec} does not contain an ES module`);
+    }
+  } else if (
+    req.query.main &&
+    req.packageConfig[req.query.main] &&
+    typeof req.packageConfig[req.query.main] === 'string'
+  ) {
+    // Deprecated, see #63
+    filename = req.packageConfig[req.query.main];
+  } else if (
+    req.packageConfig.unpkg &&
+    typeof req.packageConfig.unpkg === 'string'
+  ) {
+    filename = req.packageConfig.unpkg;
+  } else if (
+    req.packageConfig.browser &&
+    typeof req.packageConfig.browser === 'string'
+  ) {
+    // Deprecated, see #63
+    filename = req.packageConfig.browser;
+  } else {
+    filename = req.packageConfig.main || '/index.js';
+  }
+
+  // Redirect to the exact filename so relative imports
+  // and URLs resolve correctly.
+  res
+    .set({
+      'Cache-Control': 'public, max-age=31536000', // 1 year
+      'Cache-Tag': 'redirect, filename-redirect'
+    })
+    .redirect(
+      302,
+      createPackageURL(
+        req.packageName,
+        req.packageVersion,
+        filename.replace(leadingSlashes, '/'),
+        createSearch(req.query)
+      )
+    );
+}
+
+/**
+ * Redirect to the exact filename if the request omits one.
+ */
+export default async function validateFilename(req, res, next) {
+  if (!req.filename) {
+    return filenameRedirect(req, res);
+  }
+
+  next();
+}