Logs support.

Added /logs endpoint with basic logger and LoggerAdapter.

src/Controllers/LoggerController.js

@@ -0,0 +1,78 @@
+import { Parse } from 'parse/node';
+import PromiseRouter from '../PromiseRouter';
+import rest from '../rest';
+
+const Promise = Parse.Promise;
+const INFO = 'info';
+const ERROR = 'error';
+const MILLISECONDS_IN_A_DAY = 24 * 60 * 60 * 1000;
+
+// only allow request with master key
+let enforceSecurity = (auth) => {
+  if (!auth || !auth.isMaster) {
+    throw new Parse.Error(
+      Parse.Error.OPERATION_FORBIDDEN,
+      'Clients aren\'t allowed to perform the ' +
+      'get' + ' operation on logs.'
+    );
+  }
+}
+
+// check that date input is valid
+let isValidDateTime = (date) => {
+  if (!date || isNaN(Number(date))) {
+    return false;
+  }
+}
+
+export class LoggerController {
+
+  constructor(loggerAdapter) {
+    this._loggerAdapter = loggerAdapter;
+  }
+
+  // Returns a promise for a {response} object.
+  // query params:
+  // level (optional) Level of logging you want to query for (info || error)
+  // from (optional) Start time for the search. Defaults to 1 week ago.
+  // until (optional) End time for the search. Defaults to current time.
+  // order (optional) Direction of results returned, either “asc” or “desc”. Defaults to “desc”.
+  // size (optional) Number of rows returned by search. Defaults to 10
+  handleGET(req) {
+    if (!this._loggerAdapter) {
+      throw new Parse.Error(Parse.Error.PUSH_MISCONFIGURED,
+        'Logger adapter is not availabe');
+    }
+
+    let promise = new Parse.Promise();
+    let from = (isValidDateTime(req.query.from) && new Date(req.query.from)) ||
+      new Date(Date.now() - 7 * MILLISECONDS_IN_A_DAY);
+    let until = (isValidDateTime(req.query.until) && new Date(req.query.until)) || new Date();
+    let size = Number(req.query.size) || 10;
+    let order = req.query.order || 'desc';
+    let level = req.query.level || INFO;
+    enforceSecurity(req.auth);
+    this._loggerAdapter.query({
+      from,
+      until,
+      size,
+      order,
+      level,
+    }, (result) => {
+      promise.resolve({
+        response: result
+      });
+    });
+    return promise;
+  }
+
+  getExpressRouter() {
+    let router = new PromiseRouter();
+    router.route('GET','/logs', (req) => {
+      return this.handleGET(req);
+    });
+    return router;
+  }
+}
+
+export default LoggerController;