Refactoring imageRouter to modularity

This should make the imageRouter more modular and easier to extent. Also
a lot of code duplication was removed which should simplify maintenance
in future.

In the new setup we only need to provide a new module file which exports
a function called `uploadImage` and takes a filePath and a callback as
argument. The callback itself takes an error and an url as parameter.
This eliminates the need of a try-catch-block around the statement and
re-enabled the optimization in NodeJS.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/web/imageRouter/index.js

@@ -0,0 +1,42 @@
+'use strict'
+
+const Router = require('express').Router
+const formidable = require('formidable')
+
+const config = require('../../config')
+const logger = require('../../logger')
+const response = require('../../response')
+
+const imageRouter = module.exports = Router()
+
+// upload image
+imageRouter.post('/uploadimage', function (req, res) {
+  var form = new formidable.IncomingForm()
+
+  form.keepExtensions = true
+
+  if (config.imageuploadtype === 'filesystem') {
+    form.uploadDir = 'public/uploads'
+  }
+
+  form.parse(req, function (err, fields, files) {
+    if (err || !files.image || !files.image.path) {
+      response.errorForbidden(res)
+    } else {
+      if (config.debug) {
+        logger.info('SERVER received uploadimage: ' + JSON.stringify(files.image))
+      }
+
+      const uploadProvider = require('./' + config.imageuploadtype)
+      uploadProvider.uploadImage(files.image.path, function (err, url) {
+        if (err !== null) {
+          logger.error(err)
+          return res.status(500).end('upload image error')
+        }
+        res.send({
+          link: url
+        })
+      })
+    }
+  })
+})