feat: errorsController

errors should instead be passed along to express via next(), to let
express call the errorsController

controllers/errorsController.js

@@ -0,0 +1,66 @@
+const path = require('path')
+const paths = require('./pathsController')
+const ClientError = require('./utils/ClientError')
+const ServerError = require('./utils/ServerError')
+const config = require('./../config')
+const logger = require('./../logger')
+
+const self = {
+  errorPagesCodes: Object.keys(config.errorPages)
+    .filter(key => /^\d+$/.test(key))
+    .map(key => Number(key))
+}
+
+self.handle = (error, req, res, next) => {
+  if (!res || res.headersSent) {
+    console.error('Unexpected missing "res" object or headers alredy sent.')
+    return console.trace()
+  }
+
+  // Error messages that can be returned to users
+  const isClientError = error instanceof ClientError
+  const isServerError = error instanceof ServerError
+
+  const logStack = (!isClientError && !isServerError) ||
+    (isServerError && error.logStack)
+  if (logStack) {
+    logger.error(error)
+  }
+
+  const statusCode = (isClientError || isServerError)
+    ? error.statusCode
+    : 500
+
+  const json = {}
+
+  const description = (isClientError || isServerError)
+    ? error.message
+    : 'An unexpected error occurred. Try again?'
+  if (description) {
+    json.description = description
+  }
+
+  if ((isClientError || isServerError) && error.code) {
+    json.code = error.code
+  }
+
+  res.setHeader('Cache-Control', 'no-store')
+
+  if (Object.keys(json).length) {
+    json.success = false
+    return res.status(statusCode).json(json)
+  } else {
+    if (self.errorPagesCodes.includes(statusCode)) {
+      return res.status(statusCode).sendFile(path.join(paths.errorRoot, config.errorPages[statusCode]))
+    } else {
+      return res.status(statusCode).end()
+    }
+  }
+}
+
+self.handleMissing = (req, res, next) => {
+  res.setHeader('Cache-Control', 'no-store')
+  return res.status(404).sendFile(path.join(paths.errorRoot, config.errorPages[404]))
+}
+
+module.exports = self

lolisafe.js

@@ -40,6 +40,7 @@ const versions = require('./src/versions')
 logger.log('Starting lolisafe\u2026')
 const safe = express()
 
+const errors = require('./controllers/errorsController')
 const paths = require('./controllers/pathsController')
 paths.initSync()
 const utils = require('./controllers/utilsController')
@@ -317,21 +318,9 @@ safe.use('/api', api)
       }
     }
 
-    // Error pages
-    safe.use((req, res, next) => {
-      if (!res.headersSent) {
-        res.setHeader('Cache-Control', 'no-store')
-        res.status(404).sendFile(path.join(paths.errorRoot, config.errorPages[404]))
-      }
-    })
-
-    safe.use((error, req, res, next) => {
-      logger.error(error)
-      if (!res.headersSent) {
-        res.setHeader('Cache-Control', 'no-store')
-        res.status(500).sendFile(path.join(paths.errorRoot, config.errorPages[500]))
-      }
-    })
+    // Express error handlers
+    safe.use(errors.handleMissing)
+    safe.use(errors.handle)
 
     // Git hash
     if (config.showGitHash) {