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middleware/handle-errors.js

@@ -0,0 +1,57 @@
+const { liquid } = require('../lib/render-content')
+const layouts = require('../lib/layouts')
+const FailBot = require('../lib/failbot')
+const loadSiteData = require('../lib/site-data')
+
+function shouldLogException (error) {
+  const IGNORED_ERRORS = [
+    // avoid sending CSRF token errors (from bad-actor POST requests)
+    'EBADCSRFTOKEN'
+  ]
+
+  if (IGNORED_ERRORS.includes(error.code)) {
+    return false
+  }
+
+  // We should log this exception
+  return true
+}
+
+module.exports = async function handleError (error, req, res, next) {
+  // if the error is thrown before req.context is created (say, in the Page class),
+  // set req.context.site here so we can pass data/ui.yml text to the 500 layout
+  if (!req.context) {
+    const site = await loadSiteData()
+    req.context = { site: site[req.language || 'en'].site }
+  }
+
+  // display error on the page in development, but not in production
+  if (process.env.NODE_ENV !== 'production' && req.context) {
+    req.context.error = error
+  }
+
+  // Special handling for when a middleware calls `next(404)`
+  if (error === 404) {
+    return res
+      .status(404)
+      .send(await liquid.parseAndRender(layouts['error-404'], req.context))
+  }
+
+  if (process.env.NODE_ENV !== 'test') {
+    console.error('500 error!', req.path)
+    console.error(error)
+
+    if (shouldLogException(error)) {
+      await FailBot.report(error, {
+        path: req.path
+      })
+    }
+  }
+
+  // If the CSRF token is bad
+  if (error.code === 'EBADCSRFTOKEN') {
+    return res.sendStatus(403)
+  }
+
+  res.status(500).send(await liquid.parseAndRender(layouts['error-500'], req.context))
+}