move accessTokens endpoint from app unit to api unit

lib/units/api/controllers/token.js

@@ -0,0 +1,33 @@
+var Promise = require('bluebird')
+
+var dbapi = require('../../../db/api')
+var logger = require('../../../util/logger')
+
+var log = logger.createLogger('api:contoller:token')
+
+module.exports = {
+  getAccessTokens: getAccessTokens
+};
+
+function getAccessTokens(req, res) {
+  dbapi.loadAccessTokens(req.user.email)
+    .then(function(cursor) {
+      return Promise.promisify(cursor.toArray, cursor)()
+        .then(function(list) {
+          var titles = []
+          list.forEach(function(token) {
+            titles.push(token.title)
+          })
+          res.json({
+            success: true
+          , titles: titles
+          })
+        })
+    })
+    .catch(function(err) {
+      log.error('Failed to load tokens: ', err.stack)
+      res.json(500, {
+        success: false
+      })
+    })
+}